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Published on: 15/09/2018
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Questions + Answers key
Take MCQ Physics Test
1.
Can gravitational force exist without any physical contact between acting bodies?
2.
Give one major discovery resulted due to basic laws of electricity and magnetism.
3.
Name the scientific principle behind the technology, 'nuclear reactor'.
4.
Which group of Physics has recently came into existence?
5.
Give two approaches to study Physics.
6.
Why do we call Physics an exact Science?
7.
The shells of crabs found around a particular coastal location in Japan seem mostly to resemble the legendary face of a Samurai. Given below are two explanations of this observed fact. Which of these strikes you as a scientific explanation?
(a) A tragic sea accident several centuries ago drowned a young Samurai. As a tribute to his bravery, nature through its inscrutable ways immortalized his face by imprinting it on the crab shells in that area.
(b) After the sea tragedy, fishermen in that area, in a gesture of honour to their dead hero, let free any crab shell caught by them which accidentally had a shape resembling the face of a Samurai. Consequently, the particular shape of the crab shell survived longer and therefore in course of time the shape was genetically propagated. This is an example of evolution by artificial selection.
[Note: This interesting illustration taken from Carl Sagan's 'The Cosmos' highlights the fact that often strange and inexplicable facts which on the first sight appear 'supernatural' actually turn out to have simple scientific explanations. Try to think out other examples of this kind].
8.
Though the law gives women equal status in India, many people hold unscientific views on a woman's innate nature, capacity and intelligence and in practice give them a secondary status and role.
Demolish this view using scientific arguments and by quoting examples of great women in science and other spheres and persuade yourself and others that given equal opportunity, women are on par with men.
9.
India has had a long and unbroken tradition of great scholarship in Mathematics, astronomy, linguistics, logic and ethics. Yet, in parallel with this, several superstitious and obscurantistic attitudes and practices flourished in our society and unfortunately continue even today among many educated people too. How will you use your knowledge of science to develop strategies to counter these attitudes?
10.
Attempt to formulate your moral views on the practice of Science. Imagine yourself stumbling upon a discovery, which has a great academic interest but is certain to have nothing but dangerous consequences for the human society. How, if at all, will you resolve your dilemma?
11.
Write in about 1000 words, a fiction piece based on your speculation on the science and technology of the twenty second century.
12.
A LASER is a source of very intense, monochromatic and unidirectional beam of light.These properties of a LASER light can be exploited to measure long distances.The distance of moon from the earth has been already determined very precisely using a LASER as a source of light. A LASER light beamed at the moon takes 2.56 s to return after reflection at the moon's surface.How much is the radius of lunar orbit around the earth?
This question is based on echo i.e., reception of reflected waves.Radius of the lunar orbit around the earth = Distance the moon and the earth.
13.
The angle subtended by the moon at a point on the earth is 0031'. If the distance of the moon from the earthis 3.84 x 108m. Find the diameter of the moon.
14.
Explain this common observation clearly : If you look out of the window of a fast moving train, the nearby trees, houses etc. seem to move rapidly in a direction opposite to the train’s motion, but the distant objects (hill tops, the Moon, the stars etc.) seem to be stationary. (In fact, since you are aware that you are moving, these distant objects seem to move with you).
15.
Why parallax method cannot be used for measuring distances of stars more than 100 light years away?
16.
The distance of venus from sun 1.082 x 1011 is and its period of revolutions is 244.633 days. If the period of revolution of the earth around the sun is 365.247 days. Calculate the distance from the sun.
17.
Round off to four significant figures
1.0084
18.
Round off to four significant figures
36.879
19.
Which of the following length measurement is most accurate and way?
(i) 2.0 cm
(ii) 2.00cm
(iii) 2.000cm
20.
The mass of a body is measured by two persons is 0.2 kg and 10.23 kg.Which one is more accurate and why?
21.
The photograph of a house occupies an area of 1.75 cm2 on a 35 mm slide. The slide is projected on to a screen, and the area of the house on the screen is 1.55 m2 . What is the linear magnification of the projector-screen arrangement.
22.
A student measures the thickness of a human hair by looking at it through a microscope of magnification 100. He makes 20 observations and finds that the average width of the hair in the field of view of the microscope is 3.5 mm. What is the estimate on the thickness of hair ?
23.
Express an acceleration of 10 m/s2 in km/h2.
24.
A jeweller put a diamond weighing 5.42 g in a box weighing 1.2 Kg. Find the total weight of the box and the diamond to correct number of significant figures.
25.
A new unit of length is chosen such that the speed of light in vacuum is unity. What is the distance between the Sun and the Earth in terms of the new unit if light takes 8 min and 20 s to cover this distance ?
1.
( )
Yes, gravitational force exist without any physical contact between acting bodies.
2.
( )
Wireless communication technology was a major discovery due to laws of electricity and magnetism.
3.
( )
Controlled nuclear fission is the scientific principle behind the technology of steam engine.
4.
( )
An intermediate group of Physics namely mesoscopic Physics has recently came into existance.
5.
( )
Two approaches to study Physics are unification and reduction.
6.
( )
Most of measurement in physics are made with high precise and accuracy, so it is called exact Science.
7.
The explanation given in option (b) strikes as a scientific explanation.
8.
There is no difference in the capacity of the woman in taking good and quick decisions, in doing hard work and intelligence.
The development of human brain depends on the nutrition contents of prenatal and postnatal diet and it does not depend a man can also be achieved by a woman
In every field of life, woman has proved herself. Madam curie, a Physicist, won Nobel prize.
Mother Teresa was a great saint, Kalpana Chawala an astronomer, Mrs. Indira Gandhi, Marget Thacher, Lata Mangeskar etc., are well known personalities in different fields. Therefore, the woman should be given equal opportunity at par with men.
9.
Illogical practices, superstitious attitudes which are still flourishing in our society can be removed only by educating the society
Mass media like radio, TV, newspaper, magazine etc, can play a vital role in it. Programmes should be framed to target these illogical practices.
10.
Science is a search of truth. Each discovery, either it is good or bad for our society should be made public. The reason is that a discovery, which appears bad or dangerous today for our society may be useful for us later on.
We should make public aware about misuse of discoveries and technologies. e.g., nuclear fission can be used in developing atom bomb also.
11.
Imagine you along with your friends are in a spaceship which is moving towards Mars. The body of the speceship is made of a specially designed matter which become more harder as its temperature increases. nuclear power plants in spaceship.
Two of them work alternatively and third is for emergency. The speed of the spaceship is very high and all of you are very happy. The energy produced in power plants are converted into electric energy which runs the motors of the spaceship.
You along with your friends reach safely on Mars, collects data, takes photographs and then returns to the Earth. In return journey is working and due to overheating. its efficiency is decreasing continuously.
You and your friends try to reduce the temperature of the plant and try to repair the fuse of the other power plants.
Finally, fuse of one other plant is repaired and start to work before the first plant crosses the danger limit of an excess of temperature. Finally, you and your friends return safely on Earth.
12.
Time taken by al;aser beam to return after reflection at the moon's surface(T) = 2.56s
∴Time taken by a laser beam to reach the moon
\(\\ t=\frac { T }{ 2 } =\frac { 2.56 }{ 2 } =1.28\quad s\)
Speed of laser beam = Seed of light(c) = \(3\times { 10 }^{ 8 }\)m/s
∵ Distance of the moon from the earth(D)=c×t
=3×108×1.28=3.84×108m=3.84×105km
∴Radius of lunar orbit around the earth
=3.84×105km
13.
3.46 x 106m
14.
Line of sight is defined as an imaginary line joining an object and an observer’s eye. When we observe nearby stationary objects such as trees, houses, etc. while sitting in a moving train, they appear to move rapidly in the opposite direction because the line-of-sight changes very rapidly.
On the other hand, distant objects such as trees, stars, etc. appear stationary because of the large distance. As a result, the line of sight does not change its direction rapidly.
15.
When a star is more than 100 light years away, then the parallax angle is so small that it cannot be measured accurately.
16.
1.496 x 1011m
17.
1.008
18.
36.88
19.
2.000cm is most accurate because it is correct upto third place of a decimal.
20.
The value m = 10.23kg is more accurate, being correct upto 2nd place of decimal.
21.
Given, Area of object = 1.75 x 10-4 m2
Area of image = 1.55 m2
Areal magnification = \(\frac { Area\ of\ image }{ Area\ of\ object } \)
\(\frac { 1.55 }{ 1.74X{ 10 }^{ -4 } } \approx 8857\)
Linear magnification = \(\sqrt { \text{A real maginification} } \)
\(=\sqrt { 8857 } \)
= 94.1
22.
Given, Magnification of microscope = 100
Observed width of the hair = 3.5 mm
Estimates on the thickness of hair is given by,
Magnification = \(\frac { observed \ width }{ Real \ width } \)
or Real width = \(\frac { Observed\ width }{ Magnification } =\frac { 3.5 }{ 100 } \)
= 0.035 mm
23.
Acceleration = (10 m/(1s)2)
= (10 x 10-3 / [1/60 x 60])2
= (3600)2 x 10-2 km/h2
= 1.29 x 105 km/h2.
24.
Weight of diamond = 5.42 g = 0.00542 Kg
Total weight = 1.2 + 0.00542
= 1.20542 kg = 1.2 kg
25.
The speed of light (c) = 1 new unit of length s-1
Time taken by light to reach the earth t = 8 min + 20 s = (8 x 60 x 20) s = 500 s
Distance between the sun and the earth = speed of light X time
x = c x t = 1 new unit of length s-1 x 500 s
= 500 new unit of length
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