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CBSE Physics CBSE for 11th Standard CBSE Question paper & Study Materials

CBSE 11th Physics Motion in a Straight Line Chapter Case Study Questions with Answers - by users_admin - Jan 22, 2024 - View & Read

CBSE 11th Physics Units And Measurements Chapter Case Study Questions with Answers - by users_admin - Jan 22, 2024 - View & Read

CBSE 11th Standard Physics Subject System of Particles and Rotational Motion Value Based Questions 2 Mark Questions With Solution 2021 - by Girish - Chennai - May 31, 2021 - View & Read

  • 1)

    Since his childhood Sanjay had always seen his mother grinding flour in the grindstone. He had observed that his mother had to do a lot of hand work in order to get flour from wheat. He felt very helpless at that time. As he grew older he thought of an idea to connect an electric motor to the wheel of grindstone. Now, it become very easy to get flour with help of grindstone and now his mother is very happy and felt proud of his intelligence.
    List some qualities of Sanjay.

  • 2)

    Since his childhood Sanjay had always seen his mother grinding flour in the grindstone. He had observed that his mother had to do a lot of hand work in order to get flour from wheat. He felt very helpless at that time. As he grew older he thought of an idea to connect an electric motor to the wheel of grindstone . Now, it become very easy to get flour with help of grindstone and now his mother is very happy and felt proud of his intelligence.
    A grinding stone of diameter 4 m revolving at 120 rpm accelerates to 660 rpm in 9s. Calculate the angular acceleration and linear acceleration.

  • 3)

    Since his childhood Sanjay had always seen his mother grinding flour in the grindstone. He had observed that his mother had to do a lot of hand work in order to get flour from wheat. He felt very helpless at that time. As he grew older he thought of an idea to connect an electric motor to the wheel of grindstone .  Now, it become very easy to get flour with help of grindstone and now his mother is very happy and felt proud of his intelligence.
    When his mother uses grindstone to get flour, what energy transformation takes place?

  • 4)

    Since his childhood Sanjay had always seen his mother grinding flour in the grindstone. He had observed that his mother had to do a lot of hand work in order to get flour from wheat. He felt very helpless at that time. As he grew older he thought of an idea to connect an electric motor to the wheel of grindstone .  Now, it become very easy to get flour with help of grindstone and now his mother is very happy and felt proud of his intelligence.
    After attaching motor to grindstone wheel, what energy transformation takes place?

CBSE 11th Standard Physics Subject Physical World Value Based Questions 3 Mark Questions With Solution 2021 - by Girish - Chennai - May 31, 2021 - View & Read

  • 1)

    Ravinder and Mohender were discussing the role of Physics in society. Ravinder said to Mahender that Physics does not have any impact on society. He had no knowledge of science as he was the student of Arts stream. Ravinder who is the science student of class XII explained him that the fate of society is intimately linked with Physics because whatever is discovered in Physics, it immediately effects the society. The advancement in the field of communication such as radios, computers, TVs and mobile phones connect the people with each other. Nuclear energy have brought a profound change in the thinking and living style of the human beings.
    (i) What values are displayed here by Ravinder?
    (ii) Give any five discoveries which has effected the society more.

  • 2)

    Deepa's uncle was surprised to see the fast changes in the world. He is not so educated. He asked Deepa to tell him the names and qualities of some persons who have contributed for bringing the rapid changes in the world. Deepa who is science graduate explained about some discoveries and the names of scientist who have done a marvellous work in physics.
    (i) Why Deepa's uncle was so curious to know things changed recently?
    (ii) What values are displayed by Deepa?
    (iii) Name at least three Indian scientists.

  • 3)

    Usha and Ritu are two sisters. Usha wants to explain some technologies to Ritu. Initially, Ritu did not show any interest in knowing about the technologies. But Usha explained about the uses and application of some important discoveries.
    (i) What values are displayed by Usha?
    (ii) Name some technologies and related principles.

CBSE 11th Standard Physics Subject Physical World Value Based Questions 3 Mark Questions 2021 - by Girish - Chennai - May 31, 2021 - View & Read

  • 1)

    Ravinder and Mohender were discussing the role of Physics in society. Ravinder said to Mahender that Physics does not have any impact on society. He had no knowledge of science as he was the student of Arts stream. Ravinder who is the science student of class XII explained him that the fate of society is intimately linked with Physics because whatever is discovered in Physics, it immediately effects the society. The advancement in the field of communication such as radios, computers, TVs and mobile phones connect the people with each other. Nuclear energy have brought a profound change in the thinking and living style of the human beings.
    (i) What values are displayed here by Ravinder?
    (ii) Give any five discoveries which has effected the society more.

  • 2)

    Deepa's uncle was surprised to see the fast changes in the world. He is not so educated. He asked Deepa to tell him the names and qualities of some persons who have contributed for bringing the rapid changes in the world. Deepa who is science graduate explained about some discoveries and the names of scientist who have done a marvellous work in physics.
    (i) Why Deepa's uncle was so curious to know things changed recently?
    (ii) What values are displayed by Deepa?
    (iii) Name at least three Indian scientists.

  • 3)

    Usha and Ritu are two sisters. Usha wants to explain some technologies to Ritu. Initially, Ritu did not show any interest in knowing about the technologies. But Usha explained about the uses and application of some important discoveries.
    (i) What values are displayed by Usha?
    (ii) Name some technologies and related principles.

CBSE 11th Standard Physics Subject System of Particles and Rotational Motion Value Based Questions 3 Mark Questions With Solution 2021 - by Girish - Chennai - May 31, 2021 - View & Read

  • 1)

    It was summer season and Ishant was sleeping at top of roof when heard some noise at downstairs when he looked down, he saw that two robbers were holding his brother at gun point, suddenly he saw a big drum near to him and he rolled the drum from the stairs which hit one of the robber who was holding gun and robber fell down. In mean time other one run away and the family caught that robber and handed him over to the police.
    (i) What values of Ishant saved his brother's life?
    (ii) What kind of motion is described by the drum?
    (iii) If a thin hollow cylinder, opened at both the ends and weighing 5 kg rolls with a speed of 10 m/s without slipping. What is the kinetic energy of cylinder?
    (iv) What is meant by rolling without slipping?

  • 2)

    It was summer season and Ishant was sleeping at top of roof when heard some noise at downstairs when he looked down, he saw that two robbers were holding his brother at gun point, suddenly he saw a big drum near to him and he rolled the drum from the stairs which hit one of the robber who was holding gun and robber fell down. In mean time other one run away and the family caught that robber and handed him over to the police.
    What kind of motion is described by the drum?

  • 3)

    It was summer season and Ishant was sleeping at top of roof when heard some noise at downstairs when he looked down, he saw that two robbers were holding his brother at gun point, suddenly he saw a big drum near to him and he rolled the drum from the stairs which hit one of the robber who was holding gun and robber fell down. In mean time other one run away and the family caught that robber and handed him over to the police.
    If a thin hollow cylinder, opened at both the ends and weighing 5 kg rolls with a speed of 10 m/s without slipping. What is the kinetic energy of cylinder?

  • 4)

    It was summer season and Ishant was sleeping at top of roof when heard some noise at downstairs when he looked down, he saw that two robbers were holding his brother at gun point , suddenly he saw a big drum near to him and he rolled the drum from the stairs which hit one of the robber who was holding gun and robber fell down. In mean time other one run away and the family caught that robber and handed him over to the police.
    What is meant by rolling without slipping?

CBSE 11th Standard Physics Subject Value Based Questions 2 Mark Questions With Solution 2021 - by Girish - Chennai - May 31, 2021 - View & Read

  • 1)

    Since his childhood Sanjay had always seen his mother grinding flour in the grindstone. He had observed that his mother had to do a lot of hand work in order to get flour from wheat. He felt very helpless at that time. As he grew older he thought of an idea to connect an electric motor to the wheel of grindstone. Now, it become very easy to get flour with help of grindstone and now his mother is very happy and felt proud of his intelligence.
    List some qualities of Sanjay.

  • 2)

    Since his childhood Sanjay had always seen his mother grinding flour in the grindstone. He had observed that his mother had to do a lot of hand work in order to get flour from wheat. He felt very helpless at that time. As he grew older he thought of an idea to connect an electric motor to the wheel of grindstone . Now, it become very easy to get flour with help of grindstone and now his mother is very happy and felt proud of his intelligence.
    A grinding stone of diameter 4 m revolving at 120 rpm accelerates to 660 rpm in 9s. Calculate the angular acceleration and linear acceleration.

  • 3)

    Since his childhood Sanjay had always seen his mother grinding flour in the grindstone. He had observed that his mother had to do a lot of hand work in order to get flour from wheat. He felt very helpless at that time. As he grew older he thought of an idea to connect an electric motor to the wheel of grindstone .  Now, it become very easy to get flour with help of grindstone and now his mother is very happy and felt proud of his intelligence.
    When his mother uses grindstone to get flour, what energy transformation takes place?

  • 4)

    Since his childhood Sanjay had always seen his mother grinding flour in the grindstone. He had observed that his mother had to do a lot of hand work in order to get flour from wheat. He felt very helpless at that time. As he grew older he thought of an idea to connect an electric motor to the wheel of grindstone .  Now, it become very easy to get flour with help of grindstone and now his mother is very happy and felt proud of his intelligence.
    After attaching motor to grindstone wheel, what energy transformation takes place?

CBSE 11th Standard Physics Subject Value Based Questions 3 Mark Questions With Solution 2021 - by Girish - Chennai - May 31, 2021 - View & Read

  • 1)

    It was summer season and Ishant was sleeping at top of roof when heard some noise at downstairs when he looked down, he saw that two robbers were holding his brother at gun point, suddenly he saw a big drum near to him and he rolled the drum from the stairs which hit one of the robber who was holding gun and robber fell down. In mean time other one run away and the family caught that robber and handed him over to the police.
    (i) What values of Ishant saved his brother's life?
    (ii) What kind of motion is described by the drum?
    (iii) If a thin hollow cylinder, opened at both the ends and weighing 5 kg rolls with a speed of 10 m/s without slipping. What is the kinetic energy of cylinder?
    (iv) What is meant by rolling without slipping?

  • 2)

    Deepa's uncle was surprised to see the fast changes in the world. He is not so educated. He asked Deepa to tell him the names and qualities of some persons who have contributed for bringing the rapid changes in the world. Deepa who is science graduate explained about some discoveries and the names of scientist who have done a marvellous work in physics.
    (i) Why Deepa's uncle was so curious to know things changed recently?
    (ii) What values are displayed by Deepa?
    (iii) Name at least three Indian scientists.

  • 3)

    Tajender was going to Agra with his father in the month of June. It was too hot to tolerate that day. His father was driving the car. He stopped on a petrol pump in the way and got filled the tank of the petrol in the car. He also checked the air in the tyres of the car at air pump. He asked the worker who was there to fill the air that fill the air in the tyre lesser than the normal air. Tajender immediately asked the reason behind it. His father explained that while driving, the air in the tyres expand due to the heat produced by the friction between the road and tyres. Tajender got the answer and became happy.
    (i) What values Tajender exhibit?
    (ii) Can you design a heat Engine of 100% efficiency? Explain your answer.

  • 4)

    We know that all the bodies fall downwards with an accelerating velocity due to the acceleration due to gravity 9.8 m/s2 but rain drops do not fall to earth as the other bodies do. Sohan was a student of science. His father asked Sohan the reason of drops not falling to the earth with the velocity equal to other bodies. He explained this reason that all bodies fall freely irrespective of their mass and size but in case of rain drops, there is a retarding force of viscosity due to the air medium. After falling through some distance, the drops attains a constant velocity which is known as terminal velocity. Sohan's father was satisfied with his son's answer.
    (i) What values are displayed by Sohan?
    (ii) What do you mean by viscosity and terminal velocity?

  • 5)

    Rajeshwer and his friends went to a hill forest for a plant collection tour. One of the friends Rajender Rana went to a different direction and entered a dense forest. He was searching a very useful and promodeal plant. When he searched that plant, he loudly called his friend Rajeshwer. After afew seconds he heard the same sound as he just spoken. He afraid assuming that there was a ghost in nearby forest. He started erving. Somehow Rajeshwar heard his sound and found him. Again Rajender Ram made a loud sound, this sound was again copied by somebody. Rajender repeated that same ghost is there. Rajeshuiar convinced him that it is nothing but it is reflection of sound. Now Rajender Rana became normal.
    (i) What values/qualities were displayed by Rajeshwar?
    (ii) What is echo?
    (iii) If a reflector is situated at a distance of 860 m from a sound source, what is the time of echo?
    Speed of sound in air at a room temperature can be taken as 344 m/s.

CBSE 11th Standard Physics Subject Value Based Questions 3 Mark Questions 2021 Part - II - by Girish - Chennai - May 31, 2021 - View & Read

  • 1)

    It was summer season and Ishant was sleeping at top of roof when heard some noise at downstairs when he looked down, he saw that two robbers were holding his brother at gun point , suddenly he saw a big drum near to him and he rolled the drum from the stairs which hit one of the robber who was holding gun and robber fell down. In mean time other one run away and the family caught that robber and handed him over to the police.
    What is meant by rolling without slipping?

  • 2)

    Ravinder and Mohender were discussing the role of Physics in society. Ravinder said to Mahender that Physics does not have any impact on society. He had no knowledge of science as he was the student of Arts stream. Ravinder who is the science student of class XII explained him that the fate of society is intimately linked with Physics because whatever is discovered in Physics, it immediately effects the society. The advancement in the field of communication such as radios, computers, TVs and mobile phones connect the people with each other. Nuclear energy have brought a profound change in the thinking and living style of the human beings.
    (i) What values are displayed here by Ravinder?
    (ii) Give any five discoveries which has effected the society more.

  • 3)

    Shansher, a student of class X asked his physics teacher, "Why the refrigerator does not cool the room if it is kept open? Whereas the refrigerator cooles the eatables put in it. His teacher answered him that the refrigerator does not cool the room in which it is kept. When a refrigerator is working in a closed room with its door closed, it is rejecting heat from inside to the air in the room. So temperature increases gradually. When the door of the refrigerator is kept open, heat rejected by the refrigerator to the room will be more than the heat taken by the refrigerator from the room. Therefore the temperature of the room will increase at a slower rate compared to the first case.Shansher thanked his teacher for explaining it very well.
    (i) What values are shown by 5hansher?
    (ii) Calculate the efficiency of Carnot's engine working between steam point and ice point.

  • 4)

    We know that all the bodies fall downwards with an accelerating velocity due to the acceleration due to gravity 9.8 m/s2 but rain drops do not fall to earth as the other bodies do. Sohan was a student of science. His father asked Sohan the reason of drops not falling to the earth with the velocity equal to other bodies. He explained this reason that all bodies fall freely irrespective of their mass and size but in case of rain drops, there is a retarding force of viscosity due to the air medium. After falling through some distance, the drops attains a constant velocity which is known as terminal velocity. Sohan's father was satisfied with his son's answer.
    (i) What values are displayed by Sohan?
    (ii) What do you mean by viscosity and terminal velocity?

  • 5)

    Suresh went to London to his elder brother Lalit who is a Civil Engineer there. Suresh found there the currency is quite different from his country. He could not understand pound and how it is converted into rupees. He asked there an Englishman how far is the Central London from here. He replied that it is 16 miles. Suresh again got confused because he never used these units in India. In the evening Suresh inquired all about it. His brother told him about the unit system used in England. He explained his brother that here F.P.S. system is used. It means, distance is measured in foot, mass in pound and time in seconds whereas in India it is MKS system.
    (i) What values are displayed by Suresh?
    (ii) How many unit systems are there?

CBSE 11th Standard Physics Subject Value Based Questions 3 Mark Questions 2021 Part - I - by Girish - Chennai - May 31, 2021 - View & Read

  • 1)

    It was summer season and Ishant was sleeping at top of roof when heard some noise at downstairs when he looked down, he saw that two robbers were holding his brother at gun point, suddenly he saw a big drum near to him and he rolled the drum from the stairs which hit one of the robber who was holding gun and robber fell down. In mean time other one run away and the family caught that robber and handed him over to the police.
    If a thin hollow cylinder, opened at both the ends and weighing 5 kg rolls with a speed of 10 m/s without slipping. What is the kinetic energy of cylinder?

  • 2)

    Ravinder and Mohender were discussing the role of Physics in society. Ravinder said to Mahender that Physics does not have any impact on society. He had no knowledge of science as he was the student of Arts stream. Ravinder who is the science student of class XII explained him that the fate of society is intimately linked with Physics because whatever is discovered in Physics, it immediately effects the society. The advancement in the field of communication such as radios, computers, TVs and mobile phones connect the people with each other. Nuclear energy have brought a profound change in the thinking and living style of the human beings.
    (i) What values are displayed here by Ravinder?
    (ii) Give any five discoveries which has effected the society more.

  • 3)

    Shansher, a student of class X asked his physics teacher, "Why the refrigerator does not cool the room if it is kept open? Whereas the refrigerator cooles the eatables put in it. His teacher answered him that the refrigerator does not cool the room in which it is kept. When a refrigerator is working in a closed room with its door closed, it is rejecting heat from inside to the air in the room. So temperature increases gradually. When the door of the refrigerator is kept open, heat rejected by the refrigerator to the room will be more than the heat taken by the refrigerator from the room. Therefore the temperature of the room will increase at a slower rate compared to the first case.Shansher thanked his teacher for explaining it very well.
    (i) What values are shown by 5hansher?
    (ii) Calculate the efficiency of Carnot's engine working between steam point and ice point.

  • 4)

    We know that all the bodies fall downwards with an accelerating velocity due to the acceleration due to gravity 9.8 m/s2 but rain drops do not fall to earth as the other bodies do. Sohan was a student of science. His father asked Sohan the reason of drops not falling to the earth with the velocity equal to other bodies. He explained this reason that all bodies fall freely irrespective of their mass and size but in case of rain drops, there is a retarding force of viscosity due to the air medium. After falling through some distance, the drops attains a constant velocity which is known as terminal velocity. Sohan's father was satisfied with his son's answer.
    (i) What values are displayed by Sohan?
    (ii) What do you mean by viscosity and terminal velocity?

  • 5)

    Suresh went to London to his elder brother Lalit who is a Civil Engineer there. Suresh found there the currency is quite different from his country. He could not understand pound and how it is converted into rupees. He asked there an Englishman how far is the Central London from here. He replied that it is 16 miles. Suresh again got confused because he never used these units in India. In the evening Suresh inquired all about it. His brother told him about the unit system used in England. He explained his brother that here F.P.S. system is used. It means, distance is measured in foot, mass in pound and time in seconds whereas in India it is MKS system.
    (i) What values are displayed by Suresh?
    (ii) How many unit systems are there?

CBSE 11th Standard Physics Subject Thermodynamics HOT Questions 5 Mark Questions With Solution 2021 - by Girish - Chennai - May 29, 2021 - View & Read

  • 1)

    The efficiency of a Carnot engine is 1/2. If the sink temperature is reduced by 100o C, then engine efficiency becomes 2/3. Find
    (i) sink temperature
    (ii) source temperature
    (iii) Explain, why a Carnot engine cannot have 100% efficiency?

CBSE 11th Standard Physics Subject Thermal Properties of Matter HOT Questions 5 Mark Questions With Solution 2021 - by Girish - Chennai - May 29, 2021 - View & Read

  • 1)

    Aman went for a weekend trip with his parents and grandparents to a remote village. His grandfather showed him the fields and the crops they grow. As they moved forward, they saw that a bullock cart got struck in wet mud and the driver was not able to push it out by himself. Seeing him in distress, Aman ran to his help and together they pushed it out, but iron rim of the wheel came out.
    They tried to put it on the wheel but it was smaller than diameter of wheel. Suddenly, he got an idea. He collected some wood and set them on fire and heated the rim and then rim easily slipped on the wheel. Cartman thanked Aman and moved away.
    (i) What values of Aman does the incident show?
    (ii) If the diameter of the rim and ring were 5.243 m and 5.231 m respectively at 27 \(^{0}\)C. To what temperature had Aman heated the ring so as to fit the rim of the wheel? Coefficient of linear expansion of iron = 1.20 x 10-5 K-1
    (iii) Which property of solids is used in this phenomenon?

  • 2)

    Kavita was overweight. At the age of 16 yr. She weighted 70 kg. He friends used to laugh at her and she felt very embarrassed. She then decided that she would loose weight and would become fit and fine like others. She started walking daily for 30min and stopped eating food. She started taking only few fruits and milk. Her parents advised her not cut-off her meal so drastically but she didn't listen to anybody.
    The result was that she lost 30 kg weight but now she felt very weak and was not able to eat anything.Ultimately, her parents took her to a doctor who advised her to take proper balanced diet and to do exercise.
    (i) Do you think taking crash diet is advisable? Justify.
    (ii) If Kavita, weighing 60 kg now, was advised 2000 kcal diet in a day and this energy was to be used in heating her without any losses, what would be her rise in temperature? (Given, specific heat of human body is 0.83 cal g-1 oC -1)
    (iii) What is the relation between SI and CGS unit of heat?

CBSE 11th Standard Physics Subject Units and Measurements HOT Questions 5 Mark Questions With Solution 2021 - by Girish - Chennai - May 29, 2021 - View & Read

  • 1)

    Just as precise measurements are necessary in science, it is equally important to be able to make rough estimates of quantities using rudimentary ideas and common observations. Think of ways by which you can estimate the following (where an estimate is difficult to obtain, try to get upper bound on the quantity).
    The total mass of rain-bearing clouds over India during the monsoon.

  • 2)

    Just as precise measurements are necessary in science, it is equally important to be able to make rough estimates of quantities using rudimentary ideas and common observations. Think of ways by which you can estimate the following (where an estimate is difficult to obtain, try to get upper bound on the quantity).
    The mass of an speed during a storm

  • 3)

    Just as precise measurements are necessary in science, it is equally important to be able to make rough estimates of quantities using rudimentary ideas and common observations. Think of ways by which you can estimate the following (where an estimate is difficult to obtain, try to get upper bound on the quantity).
    The number of strands of hair on our head

  • 4)

    Just as precise measurements are necessary in science, it is equally important to be able to make rough estimates of quantities using rudimentary ideas and common observations. Think of ways by which you can estimate the following (where an estimate is difficult to obtain, try to get upper bound on the quantity).
    The number of air molecules in your classroom

CBSE 11th Standard Physics Subject Thermal Properties of Matter HOT Questions 2 Mark Questions With Solution 2021 - by Girish - Chennai - May 29, 2021 - View & Read

  • 1)

    Why it is much hotter above a fire than by its side?

  • 2)

    How does tea in a thermo flask remain hot for a long time?

  • 3)

    Two bodies of specific heats C1 and C2 having same heat capacities are combined to form a composite body. what is the specific heat of composite body?

  • 4)

    What are the basic requirements of a cooking utensils in respect of specific heat, thermal conductivity and coefficient of expansion?

  • 5)

    Two identical rectangular strip-one of copper and the other of steel are riveted to form a bimetallic strip. What will happen on heating?

CBSE 11th Standard Physics Subject Motion in a Plane HOT Questions 2 Mark Questions With Solution 2021 - by Girish - Chennai - May 29, 2021 - View & Read

  • 1)

    Prove that the horizontal range is same when angle of projection
    (i) greater than 450 by certain value and
    (ii) less than 450 by the same value.

  • 2)

    Prove that the horizontal range is same when angle of projection is less than 45o by the same value.

  • 3)

    Hatrick and Peterson were good friends. They went to a international trade fair at Pragati Maidan. Peterson saw a shop, where people were firing at balloons. He also asked the shopkeeper for a gun. Peterson fired three shots but none of the shots hit the target and he was qiute  confused. Hatrick was watching Peterson. He told Peterson to fire at the balloon by taking aim just above the balloon. Peterson listened to the advice of Hatrick and then he successfully hit all the balloons.
    Hatrick asked Peterson to take aim just above the balloon. Why?

  • 4)

    Can a flight of a bird, an example of composition of vectors. Why?

  • 5)

    A skilled gun man always keeps his gun slightly tilted above the line of sight while shooting. Why?

CBSE 11th Standard Physics Subject Thermal Properties of Matter HOT Questions 1 Mark Questions With Solution 2021 - by Girish - Chennai - May 29, 2021 - View & Read

  • 1)

    When we step barefoot into an office with a marble floor, we feel cold. Why?

  • 2)

    Is it possible to convert water into vapour form without increasing its temperature, if temperature and pressure of water are \(30^{ 0 }\) C and 1 atm respectively?

  • 3)

    A tightened glass stopper can be taken out easily by pouring hot water around the neck of the bottle. Why?

  • 4)

    Calorimeters are made of metals not glass. Why?

  • 5)

    Which object will cool faster when kept in open air, the one at 300 \(^{0}\) C or the one of 100 \(^{0}\)C? Why?

CBSE 11th Standard Physics Subject Gravitation HOT Questions 1 Mark Questions With Solution 2021 - by Girish - Chennai - May 29, 2021 - View & Read

  • 1)

    Two particles of masses m1 and m2 attract each other gravitationally and are set in motion under the influence of the gravitational force? Will the centre of mass move?

  • 2)

    Work done in moving a particle round a closed path under the action of gravitation force zero. Why?

  • 3)

    How much energy is required by a satellite to keep in orbiting?Neglect air resistance.

  • 4)

    An artificial satellite revolving around the earth does not need any fuel.On the other hand,the aeroplane requires fuel to fly at  certain height why?

  • 5)

    Assume that an artificial satellite release a bomb.Would the bomb ever strike the earth if the effect of air resistance in neglected?

CBSE 11th Standard Physics Subject Gravitation HOT Questions 1 Mark Questions 2021 - by Girish - Chennai - May 29, 2021 - View & Read

  • 1)

    At what factor between the two particles gravitational force does not depend?

  • 2)

    Are the Kepler's laws applicable only to the solar system?

  • 3)

    Two particles of masses m1 and m2 attract each other gravitationally and are set in motion under the influence of the gravitational force? Will the centre of mass move?

  • 4)

    When will the Kepler's law be applicable on the planets?

  • 5)

    Work done in moving a particle round a closed path under the action of gravitation force zero. Why?

CBSE 11th Standard Physics Subject HOT Questions 5 Mark Questions With Solution 2021 - by Girish - Chennai - May 29, 2021 - View & Read

  • 1)

    Just as precise measurements are necessary in science, it is equally important to be able to make rough estimates of quantities using rudimentary ideas and common observations. Think of ways by which you can estimate the following (where an estimate is difficult to obtain, try to get upper bound on the quantity).
    The total mass of rain-bearing clouds over India during the monsoon.

  • 2)

    Just as precise measurements are necessary in science, it is equally important to be able to make rough estimates of quantities using rudimentary ideas and common observations. Think of ways by which you can estimate the following (where an estimate is difficult to obtain, try to get upper bound on the quantity).
    The number of strands of hair on our head

  • 3)

    Explain why? It is easier to pull a lawn mower than to push it.

  • 4)

    Figure below shows the position-time graph of a body of mass 0.04 kg. Suggest a suitable physical context for this motion. What is the time between two consecutive impulses received by the body? What is the magnitude of each impulse?

  • 5)

    Aman went for a weekend trip with his parents and grandparents to a remote village. His grandfather showed him the fields and the crops they grow. As they moved forward, they saw that a bullock cart got struck in wet mud and the driver was not able to push it out by himself. Seeing him in distress, Aman ran to his help and together they pushed it out, but iron rim of the wheel came out.
    They tried to put it on the wheel but it was smaller than diameter of wheel. Suddenly, he got an idea. He collected some wood and set them on fire and heated the rim and then rim easily slipped on the wheel. Cartman thanked Aman and moved away.
    (i) What values of Aman does the incident show?
    (ii) If the diameter of the rim and ring were 5.243 m and 5.231 m respectively at 27 \(^{0}\)C. To what temperature had Aman heated the ring so as to fit the rim of the wheel? Coefficient of linear expansion of iron = 1.20 x 10-5 K-1
    (iii) Which property of solids is used in this phenomenon?

CBSE 11th Standard Physics Subject HOT Questions 3 Mark Questions With Solution 2021 - by Girish - Chennai - May 29, 2021 - View & Read

  • 1)

    It is a well-known fact that during a total solar eclipse the disk of the moon almost completely covers the disk of the sun. The distance of moon (rME) and sun (rSE) from the earth surface is 3.84 x 108 m and 1.496 x 1011 m while the diameter of Sun is 1.390 x 109 m. Determine the approximate diameter of the moon.

  • 2)

    State which of the following situations are possible and give an example for each of these?
    (a) An object with a constant acceleration but with zero velocity.
    (b) An object moving in a certain direction with acceleration in the perpendicular direction.

  • 3)

    A body is projected vertically upwards from A, the top of a tower it reaches the ground in it t1 second.If it is projected vertically downwards from A with the same velocity it reaches the ground in t2 second.If it falls freely, from A, prove that it would reach the ground in \(\sqrt { { t }_{ 1 }{ t }_{ 2 } } \) second.

  • 4)

    The maximum height attained by a projectile is increased by 10% by increasing its speed of projection, without changing the angle of projection. What will the percentage increase in the horizontal range?

CBSE 11th Standard Physics Subject HOT Questions 2 Mark Questions With Solution 2021 - by Girish - Chennai - May 29, 2021 - View & Read

  • 1)

    The speed-time graph for a car is shown in figure below.

    (i) Find how far the car travels in the first 4 s? Shade the area on the graph that represents the distance travelled by the car during the period.
    (ii) Which part of the graph represent uniform motion of the car?

  • 2)

    Prove that the horizontal range is same when angle of projection
    (i) greater than 450 by certain value and
    (ii) less than 450 by the same value.

  • 3)

    Hatrick and Peterson were good friends. They went to a international trade fair at Pragati Maidan. Peterson saw a shop, where people were firing at balloons. He also asked the shopkeeper for a gun. Peterson fired three shots but none of the shots hit the target and he was qiute confused. Hatrick was watching Peterson. He told Peterson to fire at the balloon by taking aim just above the balloon. Peterson listened to the advice of Hatrick and then he successfully hit all the balloons.
    What values are shown by Hatrick?

  • 4)

    Hatrick and Peterson were good friends. They went to a international trade fair at Pragati Maidan. Peterson saw a shop, where people were firing at balloons. He also asked the shopkeeper for a gun. Peterson fired three shots but none of the shots hit the target and he was qiute  confused. Hatrick was watching Peterson. He told Peterson to fire at the balloon by taking aim just above the balloon. Peterson listened to the advice of Hatrick and then he successfully hit all the balloons.
    What do you mean by projectile motion?

  • 5)

    A skilled gun man always keeps his gun slightly tilted above the line of sight while shooting. Why?

CBSE 11th Standard Physics Subject HOT Questions 2 Mark Questions 2021 - by Girish - Chennai - May 29, 2021 - View & Read

  • 1)

    At t = 0, a particle is at rest at origin. Its acceleration is 2 rn/ s2 for the first 3s and -2 m / s2 for next 3s. Plot the acceleration versus time and velocity versus time graph.

  • 2)

    Prove that the horizontal range is same when angle of projection is less than 45o by the same value.

  • 3)

    Hatrick and Peterson were good friends. They went to a international trade fair at Pragati Maidan. Peterson saw a shop, where people were firing at balloons. He also asked the shopkeeper for a gun. Peterson fired three shots but none of the shots hit the target and he was qiute  confused. Hatrick was watching Peterson. He told Peterson to fire at the balloon by taking aim just above the balloon. Peterson listened to the advice of Hatrick and then he successfully hit all the balloons.
    Hatrick asked Peterson to take aim just above the balloon. Why?

  • 4)

    Can a flight of a bird, an example of composition of vectors. Why?

  • 5)

    A person driving a car suddenly applies the brakes on seeing a child on the road ahead. If he is not wearing seat belt, he falls forward and hits his head against the steering wheel. Why ?

CBSE 11th Standard Physics Subject HOT Questions 1 Mark Questions With Solution 2021 - by Girish - Chennai - May 29, 2021 - View & Read

  • 1)

    Human heart is an inbuilt clock.comment.

  • 2)

    Draw position-time graph for a non-uniform motion, when body starts from origin with increasing velocity.

  • 3)

    Can the mass of body be taken to be concentrated at its centre of mass for the purpose of calculating its rotational inertia?

  • 4)

    At what factor between the two particles gravitational force does not depend?

  • 5)

    Two particles of masses m1 and m2 attract each other gravitationally and are set in motion under the influence of the gravitational force? Will the centre of mass move?

CBSE 11th Standard Physics Subject HOT Questions 1 Mark Questions 2021 - by Girish - Chennai - May 29, 2021 - View & Read

  • 1)

    Draw position-time graph for a non-uniform motion, when body starts from origin with increasing velocity.

  • 2)

    Can the mass of body be taken to be concentrated at its centre of mass for the purpose of calculating its rotational inertia?

  • 3)

    At what factor between the two particles gravitational force does not depend?

  • 4)

    Two particles of masses m1 and m2 attract each other gravitationally and are set in motion under the influence of the gravitational force? Will the centre of mass move?

  • 5)

    Work done in moving a particle round a closed path under the action of gravitation force zero. Why?

CBSE 11th Standard Physics Subject Motion in a Plane Ncert Exemplar MCQ Questions With Solution 2021 - by Girish - Chennai - May 26, 2021 - View & Read

  • 1)

    Which one of the following statements is true?

  • 2)

    Consider the quantities, pressure, power, energy, impulse, gravitational potential, electrical charge, temperature, area. Out of these, the only vector quantity lies is/ are

  • 3)

    The component of a vector r along X-axis will have maximum value if

  • 4)

    In a two dimensional motion, instantaneous speed Vo is a positive constant. Then, which of the following are necessarily true?

  • 5)

    Figure shows the orientation of two vectors u and v in the xy-plane

    \(\text { If } \mathbf{u}=a \hat{\mathbf{i}}+b \hat{\mathbf{j}} \text { and } \mathbf{v}=p \hat{\mathbf{i}}+q \hat{\mathbf{j}}\) Which of the following is correct?

CBSE 11th Standard Physics Subject Kinetic Theory Ncert Exemplar 1 Mark Questions With Solution 2021 - by Girish - Chennai - May 26, 2021 - View & Read

  • 1)

    Calculate the number of atoms in 39.4 g gold. Molar mass of gold is 197g mol-1 .

  • 2)

    When air is pumped into a cycle tyre the volume and pressure of the air in the tyre both are increased." What about Boyle's law in this case?

  • 3)

    The volume of a given mass of a gas at 270C, 1 atm is 100 cc. What will be its volume at 3270C?

  • 4)

    Two molecules of a gas have speeds of 9 \(\times\)106 ms-1 and 1 \(\times\) 106 ms-1, respectively. What is the root mean square speed of these molecules ?

  • 5)

    Calculate the ratio of the mean free paths of the molecules of two gases having molecular diameters \(1\overset { 0 }{ A } \) and \(2\overset { 0 }{ A } \). The gases may be considered under identical conditions of temperature, pressure and volume.

CBSE 11th Standard Physics Subject Kinetic Theory Ncert Exemplar 1 Mark Questions 2021 - by Girish - Chennai - May 26, 2021 - View & Read

  • 1)

    Calculate the number of atoms in 39.4 g gold. Molar mass of gold is 197g mol-1 .

  • 2)

    When air is pumped into a cycle tyre the volume and pressure of the air in the tyre both are increased." What about Boyle's law in this case?

  • 3)

    The volume of a given mass of a gas at 270C, 1 atm is 100 cc. What will be its volume at 3270C?

  • 4)

    Two molecules of a gas have speeds of 9 \(\times\)106 ms-1 and 1 \(\times\) 106 ms-1, respectively. What is the root mean square speed of these molecules ?

  • 5)

    Calculate the ratio of the mean free paths of the molecules of two gases having molecular diameters \(1\overset { 0 }{ A } \) and \(2\overset { 0 }{ A } \). The gases may be considered under identical conditions of temperature, pressure and volume.

CBSE 11th Standard Physics Subject Waves Ncert Exemplar 1 Mark Questions With Solution 2021 - by Girish - Chennai - May 26, 2021 - View & Read

  • 1)

    How speed of sound waves in air varies with humidity?

  • 2)

    Show that when a string fixed at its two ends vibrates in 1 loop, 2 loops, 3loops and 4loops, the frequencies are in the ratio 1:2:3:4.

  • 3)

    A train standing at the outer signal of a railway station blows a whistle of frequency 400 Hz still air. The train begins to move with a speed of 10 ms-1 towards the platform. What is the frequency of the sound for an observer standing on the platform? (Sound velocity in air =330 ms-1).

  • 4)

    When two waves of almost equal frequencies n1 and n2 reach at a point, simultaneously. What is the time interval between successive maxima?

  • 5)

    A sonometer wire is vibrating in resonance with a tuning fork. Keeping the tension applied same, the length of the wire is doubled. Under what conditions would the tuning fork still be in resonance with the wire?

CBSE 11th Standard Physics Subject Waves Ncert Exemplar 1 Mark Questions 2021 - by Girish - Chennai - May 26, 2021 - View & Read

  • 1)

    What is the quantity transmitted with propagation of longitudinal waves through a medium?

  • 2)

    What is the nature of water waves produced by a motorboat sailing in water ?

  • 3)

    How speed of sound waves in air varies with humidity?

  • 4)

    The displacement of an elastic wave is given by the function y = 3sin \(\omega \)t + 4cos\(\omega \)t Where, y is in cm and t is in second.Calculate the resultant amplitude.

  • 5)

    Sound waves of wavelength \(\lambda \) travelling in a medium with a speed of vm/s enter into another medium where its speed is 2vm/s.Wavelength of sound waves in the second medium is

CBSE 11th Standard Physics Subject Waves Ncert Exemplar 2 Mark Questions With Solution 2021 - by Girish - Chennai - May 26, 2021 - View & Read

  • 1)

    At what temperature (in 0C) Will be speed of sound air be 3 times its value at 00 C?

  • 2)

    A sitar wire is replaced by another wire of same length and material but of three times the earlier radius. If the tension in the wire remains the same, then by what factor will the frequency change?

  • 3)

    You have learnt that a travelling wave in one dimension is represented by a function y = f (x, t) where x and t must appear in the combination x – v t or x + v t, i.e. y = f (x ± v t). Is the converse true? Examine if the following functions for y can possibly represent a travelling wave :
    (i) (x - vt) 2
    (ii) log [(x + vt)/x0]
    (iii) 1/(x + vt)

  • 4)

    You have learnt that a travelling wave in one dimension is represented by a function y = f(x,t) where, x and t must appear in the combination x- vt or x + vt, i.e. y = f( x \(\pm \) vt ). Is the converse true?
    (a) Examine if the following functions for Y can possibly represent a travelling wave
    (b) Examine if the following functions for Y can possibly represent a travelling wave (x - vt)2

CBSE 11th Standard Physics Subject Waves Ncert Exemplar 2 Mark Questions 2021 - by Girish - Chennai - May 26, 2021 - View & Read

  • 1)

    A steel wire has a length of 12 m and a mass of 2.10 kg. What will be the speed of a transverse wave on this wire when a tension of 2.06\(\times \)104N is applied?

  • 2)

    A tuning fork A, marked 512 Hz, produces 5 beats per sec, where sounded with another unmarked tuning fork B. If B is loaded with wax, the number of beats is again 5 per sec. What is the frequency of the tuning fork B when not loaded?

  • 3)

    A pipe 20 cm long is closed at one end. Which harmonic mode of the pipe is resonantly excited by a source of 1237.5 Hz? (sound velocity in air = 330ms-1)

  • 4)

    Equation of a plane progressive wave is given by y = 0.6 sin\(2\pi \left( t-\frac { x }{ 2 } \right) \) On reflection from a denser medium, its amplitude becomes 2/3 of the amplitude of  incident wave. What will be equation of reflected wave?

  • 5)

    At what temperature (in 0C) Will be speed of sound air be 3 times its value at 00 C?

CBSE 11th Standard Physics Subject System of Particles and Rotational Motion Ncert Exemplar 5 Mark Questions With Solution 2021 - by Girish - Chennai - May 26, 2021 - View & Read

  • 1)

    (a) A child stands at the centre of a turntable with his two arms outstretched. The turntable is set rotating with an angular speed of 40 rev/min. How much is the angular speed of the child if he folds his hands back and thereby reduces his moment of inertia to 2/5 times the initial value ? Assume that the turntable rotates without friction.
    (b) Show that the child’s new kinetic energy of rotation is more than the initial kinetic energy of rotation. How do you account for this increase in kinetic energy?

  • 2)

    A disc of radius R is rotating with an angular speed \(\omega \), about a horizontal axis. It is placed on a horizontal table. The coefficient of kinetic friction is \({ \mu }_{ k }\).
    (i) What was the velocity of its centre of mass before being brought in contact with the table?
    (ii) What happens to the linear velocity of a point on its rim when placed in contact with the table?
    (iii) What happens to the linear speed of the centre of mass when disc is placed in contact with the table?
    (iv) Which force is responsible for the effect in (ii) and (iii)?
    (v) What condition should be satisfied for rolling to begin?
    (vi) Calculate the time taken for the rolling to begin.

  • 3)

    A solid sphere rolls down two different inclined planes of the same heights but different angles of inclination.
    (a) Will it reach the bottom with the same speed in each case?
    (b) Will it take longer to roll down one plane than the other?
    (c) If so, which one and why?

  • 4)

    The oxygen molecule has a mass of 5.30 × 10-26 kg and a moment of inertia of 1.94 × 10-46 kg m2 about an axis through its centre perpendicular to the lines joining the two atoms. Suppose the mean speed of such a molecule in a gas is 500 m/s and that its kinetic energy of rotation is two thirds of its kinetic energy of translation. Find the average angular velocity of the molecule.

CBSE 11th Standard Physics Subject System of Particles and Rotational Motion Ncert Exemplar 5 Mark Questions 2021 - by Girish - Chennai - May 26, 2021 - View & Read

  • 1)

    A door is hinged at one end and is free to rotate about a vertical axis. Does its weight cause any torque about its axis? Give reason for your answer .

CBSE 11th Standard Physics Subject Motion in a Straight Line Ncert Exemplar 5 Mark Questions 2021 - by Girish - Chennai - May 26, 2021 - View & Read

  • 1)

    It is a common observation that rain clouds can be at about a kilometre altitude above the ground.
    (a) If a rain drop falls from such a height freely under gravity, what will be its speed?Also, calculate in km/h (g = 10 m/s2).
    (b) A typical rain drop is about 4 mm diameter.Momentum is mass x speed in magnitude.Estimate its momentum when it hits ground.
    (c) Estimate time required to flatten the drop.
    (d) Rate of change of momentum is force.Estimate how much force such a drop would exert on you?
    (e) Estimate the order of magnitude force on umbrella. Typical lateral separation between two rain drops is 5cm.

CBSE 11th Standard Physics Subject Waves Ncert Exemplar 5 Mark Questions With Solution 2021 - by Girish - Chennai - May 26, 2021 - View & Read

  • 1)

    For the harmonic travelling wave \(y=2\cos { 2\pi } \left( 10t-0.0080x+3.5 \right) \), where, x and y are in cm and t is in second. What is the phase difference between the oscillatory motion at two points separated by a distance of What is the phase difference between the oscillation of a particle located at x=100 cm, at t=Ts and t = 5s?

  • 2)

    In the given progressive wave,  Where, y and x are in m,t is in seconds. What is the wavelength?

  • 3)

    In the given progressive wave
    y=5sin(100πt−0.4πx) where y and x are in m,t is in s.
    A: What is the amplitude and wavelength?
    B: What is the frequency and wave velocity? (Wavelength is 5 m)
    C: What is the particle velocity amplitude?

CBSE 11th Standard Physics Subject Waves Ncert Exemplar 5 Mark Questions 2021 - by Girish - Chennai - May 26, 2021 - View & Read

  • 1)

    For the harmonic travelling wave  \(y=2\cos { 2\pi } \left( 10t-0.0080x+3.5 \right) \) , where, x and y are in cm and t is in second. What is the phase difference between the oscillatory motion at two points separated by a distance of 0.5 m.

  • 2)

    For the harmonic travelling wave  \(y=2\cos { 2\pi } \left( 10t-0.0080x+3.5 \right) \) , where, x and y are in cm and t is in second. What is the phase difference between the oscillatory motion at two points separated by a distance of \(\frac { \lambda }{2 } \).

  • 3)

    For the harmonic travelling wave  \(y=2\cos { 2\pi } \left( 10t-0.0080x+3.5 \right) \) , where, x and y are in cm and t is in second. What is the phase difference between the oscillatory motion at two points separated by a distance of \(\frac { 3\lambda }{ 4 } \)(at a given instant in time)?

  • 4)

    For the harmonic travelling wave \(y=2\cos { 2\pi } \left( 10t-0.0080x+3.5 \right) \), where, x and y are in cm and t is in second. What is the phase difference between the oscillatory motion at two points separated by a distance of What is the phase difference between the oscillation of a particle located at x=100 cm, at t=Ts and t = 5s?

  • 5)

    In the given progressive wave, \(y=5sin(100\pi t-0.4\pi x)\)
    Where, y and x are in m,t is in seconds. What is the  
    (i) amplitude
    (ii) wavelength
    (iii) frequency
    (iv) wave velocity
    (v) particle velocity amplitude?

CBSE 11th Standard Physics Subject Ncert Exemplar 5 Mark Questions With Solution 2021 - by Girish - Chennai - May 26, 2021 - View & Read

  • 1)

    It is a common observation that rain clouds can be at about a kilometre altitude above the ground.
    (a) If a rain drop falls from such a height freely under gravity, what will be its speed?Also, calculate in km/h (g = 10 m/s2).
    (b) A typical rain drop is about 4 mm diameter.Momentum is mass x speed in magnitude.Estimate its momentum when it hits ground.
    (c) Estimate time required to flatten the drop.
    (d) Rate of change of momentum is force.Estimate how much force such a drop would exert on you?
    (e) Estimate the order of magnitude force on umbrella. Typical lateral separation between two rain drops is 5cm.

  • 2)

    When a body slides down from rest along a smooth inclined plane making an angle of 45o with the horizontal, it takes time T. when the same body slides down from rest along a rough inclined plane making the same angle and through the same distance, it is seen to taken time pT, where p is some number greater than 1. Calculate the coefficient of friction between the body and the rough plane.

  • 3)

    (a) A child stands at the centre of a turntable with his two arms outstretched. The turntable is set rotating with an angular speed of 40 rev/min. How much is the angular speed of the child if he folds his hands back and thereby reduces his moment of inertia to 2/5 times the initial value ? Assume that the turntable rotates without friction.
    (b) Show that the child’s new kinetic energy of rotation is more than the initial kinetic energy of rotation. How do you account for this increase in kinetic energy?

CBSE 11th Standard Physics Subject Ncert Exemplar 5 Mark Questions 2021 Part - I - by Girish - Chennai - May 26, 2021 - View & Read

  • 1)

    It is a common observation that rain clouds can be at about a kilometre altitude above the ground.
    (a) If a rain drop falls from such a height freely under gravity, what will be its speed?Also, calculate in km/h (g = 10 m/s2).
    (b) A typical rain drop is about 4 mm diameter.Momentum is mass x speed in magnitude.Estimate its momentum when it hits ground.
    (c) Estimate time required to flatten the drop.
    (d) Rate of change of momentum is force.Estimate how much force such a drop would exert on you?
    (e) Estimate the order of magnitude force on umbrella. Typical lateral separation between two rain drops is 5cm.

  • 2)

    A girl riding a bicycle along a straight road with a speed of 5 m/ s throws a stone of mass 0.5 kg which has a speed of 15 m /s with respect to the ground along her direction of motion. The mass of the girl and bicycle is 50 kg. Does the speed of the bicycle change after the stone is thrown ? What is the change in speed, if so ?

  • 3)

    Figure shows (x, t), (y, t) diagram of a particle moving in 2-dimensions.
     
    If the particle has a mass of 500 g, find the force (direction and magnitude) acting on the particle.

CBSE 11th Standard Physics Subject Ncert Exemplar 3 Mark Questions With Solution 2021 - by Girish - Chennai - May 26, 2021 - View & Read

  • 1)

    A police van moving on a highway with a speed of 30 km h–1 fires a bullet at a thief’s car speeding away in the same direction with a speed of 192 km h–1. If the muzzle speed of the bullet is 150 m s–1, with what speed does the bullet hit the thief’s car ? (Note: Obtain that speed which is relevant for damaging the thief’s car).

  • 2)

    Two towns A and B are connected by a regular bus service witha bus leaving in either direction every t min. A man cycling with a speed of 20 km/h in the direction A to B notices that a bus goes past him every 18 min in the direction of his motion and every  6 min in the opposite direction .What is the period T of the bus servioce and with what speed ( assumed constant) do the buses ply on the road?

  • 3)

    A wheel in uniform motion about an axis passing through its centre and perpendicular to its plane is considered to be in mechanical (translation and rotational) equilibrium because no net external torque is required to sustain its motion.
    However, the particles that constitute the wheel to experience a centripetal acceleration towards the centre. How do you reconcile this fact with the wheel begin in equilibrium?
    How would you set a half wheel into uniform motion about an axis passing through the centre of mass of the wheel and perpendicular to its plane? Will you require external forces to sustain the motion?

  • 4)

    A child stands at centre of a turntable with his arms out stretched. The turntable is set rotating with an angular speed of 40 rev/min.
    Show that child's new kinetic energy of rotations is more than the initial kinetic energy. How do you account for this increase in kinetic energy?

  • 5)

    A hoop of radius 2m weighs 100 kg. It rolls along a horizontal floor so that its centre of mass has a speed of 20 cm/s. How much work has to be done to stop it?

CBSE 11th Standard Physics Subject Ncert Exemplar 2 Mark Questions With Solution 2021 - by Girish - Chennai - May 26, 2021 - View & Read

  • 1)

    A person of mass 50 kg stands on a weighing scale on a lift. If the lift is descending with a downwards acceleration of 9 m/s2 , what would be the reading of the weighing scale ?
    When a lift descends with a downward acceleration 8, V the apparent weight of a body of mass m is given by w' = R = m (g - a)

  • 2)

    Calculate the work done by a car against gravity is zero because force of gravity is vertical and motion of car is along a straight horizontal road.

  • 3)

    Why does a solid sphere have smaller moment of inertia than a hollow cylinder of same mass and radius about an axis passing through their axis of symmetry?

  • 4)

    A solid cylinder of mass 20 kg rotates about its axis with angular speed of 100 rad/s. The radius of cylinder is 0.25m. What is KE of rotation of cylinder?

  • 5)

    A string of mass 2.5 kg is under a tension of 200N. The length of the stretched string is 20.0 m.If the transverse jerk is struck at one end of the string, the disturbance will reach the other end in.

CBSE 11th Standard Physics Subject Ncert Exemplar 2 Mark Questions 2021 Part - I - by Girish - Chennai - May 26, 2021 - View & Read

  • 1)

    A person of mass 50 kg stands on a weighing scale on a lift. If the lift is descending with a downwards acceleration of 9 m/s2 , what would be the reading of the weighing scale ?
    When a lift descends with a downward acceleration 8, V the apparent weight of a body of mass m is given by w' = R = m (g - a)

  • 2)

    Calculate the work done by a car against gravity is zero because force of gravity is vertical and motion of car is along a straight horizontal road.

  • 3)

    Why does a solid sphere have smaller moment of inertia than a hollow cylinder of same mass and radius about an axis passing through their axis of symmetry?

  • 4)

    A solid cylinder of mass 20 kg rotates about its axis with angular speed of 100 rad/s. The radius of cylinder is 0.25m. What is KE of rotation of cylinder?

  • 5)

    Equation of a plane progressive wave is given by y = 0.6 sin\(2\pi \left( t-\frac { x }{ 2 } \right) \)
    On reflection from a denser medium, its amplitude becomes 2/3 of the amplitude of  incident wave. What will be equation of reflected wave?

CBSE 11th Standard Physics Subject Ncert Exemplar 1 Mark Questions With Solution 2021 - by Girish - Chennai - May 26, 2021 - View & Read

  • 1)

    Name the device used for measuring the mass of atoms and molecules.

  • 2)

    The vector sum of a system of non-collinear forces acting on a rigid body is given to be non-zero. If the vector sum of all the torques due to the system of forces about a certain point is found to be zero, does this mean that it is necessarily zero about any arbitrary point?

  • 3)

    What is the direction of areal velocity of the earth around the sun?

  • 4)

    Is stress a vector quantity ?

  • 5)

    Can a system be heated and its temperature remain constant?

CBSE 11th Standard Physics Subject Ncert Exemplar 1 Mark Questions 2021 Part - I - by Girish - Chennai - May 26, 2021 - View & Read

  • 1)

    Suppose we use a physical balance to measure the mass of an object and find the mean value of our observation to be 156.28 g. Represent this result correctly.

  • 2)

    (n-1) equal point masses each of mass m are palced at the verticle of a regular n-polygon. The vacant vartex has a position vector a with respect to the centre of the polygon. Find the position vector of centre of mass.

  • 3)

    Out of aphelion and perihelion, where is the speed of the earth more and why?

  • 4)

    Is stress a vector quantity ?

  • 5)

    Can a system be heated and its temperature remain constant?

CBSE 11th Standard Physics Subject Ncert Exemplar MCQ Questions With Solution 2021 - by Girish - Chennai - May 26, 2021 - View & Read

  • 1)

    Young's modulus of steel is 1.9 x 1011 N / m2. When expressed in CGSunits of dyne / cm 2 , it will be equal to (1N =10 5 dyne, 1 m 2 = 104 cm2)

  • 2)

    The mean length of an object is 5 cm. Which of the following measurements is most accurate?

  • 3)

    The number of significant figures in 0.06900 is _____.

  • 4)

    The numbers 2.745 and 2.735 on rounding off to 3 significant figures will give _____.

  • 5)

    A lift is coming from 8th floor and is just about to reach 4th floor. Taking ground floor as origin and positive direction upwards for all quantities, which one of the following is correct?

CBSE 11th Standard Physics Subject Ncert Exemplar MCQ Questions 2021 Part - I - by Girish - Chennai - May 26, 2021 - View & Read

  • 1)

    Which of the following measurement is most precise?

  • 2)

    The mean length of an object is 5 cm. Which of the following measurements is most accurate?

  • 3)

    The number of significant figures in 0.06900 is _____.

  • 4)

    The numbers 2.745 and 2.735 on rounding off to 3 significant figures will give _____.

  • 5)

    A lift is coming from 8th floor and is just about to reach 4th floor. Taking ground floor as origin and positive direction upwards for all quantities, which one of the following is correct?

CBSE 11th Standard Physics Waves (Textbook) Volume 2 - 2021 - by users_admin - May 19, 2021 - View & Read

CBSE 11th Standard Physics Thermodynamics (Textbook) Volume 2 - 2021 - by users_admin - May 19, 2021 - View & Read

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CBSE 11th Standard Physics Textbook Volume 2 - 2021 - by users_admin - May 19, 2021 - View & Read

CBSE 11th Standard Physics Work, Energy And Power (Textbook) Volume 1 - 2021 - by users_admin - May 19, 2021 - View & Read

CBSE 11th Standard Physics Units And Measurement (Textbook) Volume 1 - 2021 - by users_admin - May 19, 2021 - View & Read

CBSE 11th Standard Physics Systems Of Particles And Rotational Motion (Textbook) Volume 1 - 2021 - by users_admin - May 19, 2021 - View & Read

CBSE 11th Standard Physics Physical World (Textbook) Volume 1 - 2021 - by users_admin - May 19, 2021 - View & Read

CBSE 11th Standard Physics Motion In A Straight Plane (Textbook) Volume 1 - 2021 - by users_admin - May 19, 2021 - View & Read

CBSE 11th Standard Physics Motion In A Plane (Textbook) Volume 1 - 2021 - by users_admin - May 19, 2021 - View & Read

CBSE 11th Standard Physics Laws Of Motion (Textbook) Volume 1 - 2021 - by users_admin - May 19, 2021 - View & Read

CBSE 11th Standard Physics Gravitation (Textbook) Volume 1 - 2021 - by users_admin - May 19, 2021 - View & Read

CBSE 11th Standard Physics Appendices (Textbook) Volume 1 - 2021 - by users_admin - May 19, 2021 - View & Read

CBSE 11th Standard Physics Contents (Textbook) Volume 1 - 2021 - by users_admin - May 19, 2021 - View & Read

CBSE 11th Standard Physics Textbook Volume 1 - 2021 - by users_admin - May 19, 2021 - View & Read

CBSE 11th Standard Physics Syllabus 2019-20 - by users_admin - May 17, 2021 - View & Read

CBSE 11th Standard Physics 2015 Question paper - by users_admin - May 08, 2021 - View & Read

CBSE 11th Standard Physics Work, Energy and Power Key Points - by users_admin - Apr 28, 2021 - View & Read

CBSE 11th Standard Physics Waves Key Points - by users_admin - Apr 28, 2021 - View & Read

CBSE 11th Standard Physics Units and Measurement Key Points - by users_admin - Apr 28, 2021 - View & Read

CBSE 11th Standard Physics Thermodynamics Key Points - by users_admin - Apr 28, 2021 - View & Read

CBSE 11th Standard Physics Thermal Properties of Matter Key Points - by users_admin - Apr 28, 2021 - View & Read

CBSE 11th Standard Physics Systems of Particles and Rotational Motion Key Points - by users_admin - Apr 28, 2021 - View & Read

CBSE 11th Standard Physics Physical World Key Points - by users_admin - Apr 28, 2021 - View & Read

CBSE 11th Standard Physics Oscillations Key Points - by users_admin - Apr 28, 2021 - View & Read

CBSE 11th Standard Physics Motion in a Straight Line Key Points - by users_admin - Apr 28, 2021 - View & Read

CBSE 11th Standard Physics Motion in a Plane Key Points - by users_admin - Apr 28, 2021 - View & Read

CBSE 11th Standard Physics Mechanical Properties of Solids Key Points - by users_admin - Apr 28, 2021 - View & Read

CBSE 11th Standard Physics Mechanical Properties of Fluids Key Points - by users_admin - Apr 28, 2021 - View & Read

CBSE 11th Standard Physics Law of Motion Class Key Points - by users_admin - Apr 28, 2021 - View & Read

CBSE 11th Standard Physics Kinetic Theory Key Points - by users_admin - Apr 28, 2021 - View & Read

CBSE 11th Standard Physics Gravitation Class Key Points - by users_admin - Apr 28, 2021 - View & Read

CBSE 11th Standard Physics Syllabus - by users_admin - Apr 26, 2021 - View & Read