Physical World

Download CBSE Class 11th Standard CBSE Physics question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 11th Standard CBSE Physics

Questions:

1 Marks

5 x 1 = 5

How much stronger nuclear force is compared to electromagnetic force?

Give one major discovery resulted due to basic laws of electricity and magnetism.

Name the scientific principle behind the technology, 'nuclear reactor'.

Which group of Physics has recently came into existence?

Name two major groups of Physics.

Generic 2

5 x 2 = 10

What is unified field theory?

Name that branch of science which deals with the study of Earth.

Name that branch of science which deals with the study of stars.

Though India now has a large base in science and technology which is fast expanding, it is still a long way for realizing its potential for becoming a world leader in Science. Name some important factors, which in your view have hindered the advancement of science in India.

10.

"It is more important to have beauty in the equation of Physics than to have them agree with experiments". the great British physicist PAM Dirac held this view. Criticize this statement. Look out for some equations and result in this book which strike you as beautiful.

Generic 5

1 x 5 = 5

11.

Science, like any knowledge, can be put to good or bad use, depending on the user. Given below are some of the application of science. Formulate your views on whether the particular application is good, bad or something that cannot be so clearly categorized.
(i) Mass vaccination against small pox to curb and finally eradicate this disease from the population.
(ii) Television for eradication of illiteracy and for mass communication for news and ideas.
(iii) Prenatal sex determination.
(iv) Computers for increase in work efficiency.
(v) Putting artificial satellites around the earth.
(vi) Development of nuclear weapons.
(vii) Development of new and powerful techniques of chemical and biological warfare.
(viii) Purification of water for drinking.
(ix) Plastic surgery.
(x) Cloning.

Generic 3

6 x 3 = 18

12.

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.

13.

The physicists think at a level far higher than a normal individual. Explain.

14.

Briefly, do we need quantum theory?

15.

Is physics more of a philosophy or more of a mathematical science?

16.

what do you mean by mass energy equivalence? Give example.

17.

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].

Multiple Choice Question

10 x 1 = 10

18.

To which country, scientist J.J Thomson belong?

(a)

U.S.A.

(b)

U.K

(c)

India

(d)

Pakistan

19.

C.V. Raman got Nobel prize for his discovery about

(a)

Ultrasonic

(b)

Molecular spectra

(c)

Theory of vision

(d)

Theory of vibration in musical instrument

20.

Arrange four types of basic forces in the order of increasing strength in code using a, b, c and d.

(a)

Gravitational forces

(b)

Electromagnetic forces

(c)

Nuclear forces

(d)

Electrostatic forces

21.

Who proposed the wave theory?

(a)

Maxwell

(b)

Huygens

(c)

M. Plank

(d)

G.P. Thomson

22.

The name of the particle 'Boson' is associated with the name of :

(a)

J.C, Bose

(b)

S.N. Bose

(c)

Issac Newton

(d)

Albert Einstein

23.

Who proposed the wave theory of light?

(a)

G. P. Thomson

(b)

Huygens

(c)

M. Planck

(d)

Maxwell

24.

Who gave theory of relativity?

(a)

Einstein

(b)

C. D. Anderson

(c)

Huygens

(d)

Newton

25.

Which scientific principle is steam engine based on:

(a)

Motion of charged particles in electric and magnetic field

(b)

newton's laws of motion

(c)

Thermodynamics

(d)

Propagation of electromagnetic waves

26.

Who discovered scattering of light?

(a)

C. V. Raman

(b)

W. Wein

(c)

Hess

(d)

W. L. Bragg

27.

Who gave Universal Law of Gravitation?

(a)

Einstein

(b)

Sir Isaac Newton

(c)

J. D. Van der Waals

(d)

Galileo

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Answers Key:

1 Marks

5 x 1 = 5

()
A strong nuclear force is 100 times stronger than the electromagnetic force in strength.

()
Wireless communication technology was a major discovery due to laws of electricity and magnetism.

()
Controlled nuclear fission is the scientific principle behind the technology of steam engine.

()
An intermediate group of Physics namely mesoscopic Physics has recently came into existance.

()
The two major groups of physics are microscopic group and macroscopic group.

Generic 2

5 x 2 = 10

The theory with which scientists try to unify all forces is called unified field theory.

Geology.

Astronomy.

Few important factors which have hindered the advancement of science in India are given below
(i) Poverty, due to which there is a lack of resources and infrastructure
(ii) Poor management of science education
(iii) Lack of scientific planning
(iv) No coordination between researchers and industrialists

10.

The statement of great British physicist PAM Dirac is partially true.
e.g. F = ma, E = mc² are some of the simple and beautiful equations of physics which have universal application.
However, this is not the case always. The equations involved in general theory of simple nor beautiful. They are rather difficult to understand.

Generic 5

1 x 5 = 5

11.

(i) Mass vaccination is good as, it is used to make the socity free from the diseases like small pox.
(ii) Television for eradication of illiteracy and for mass communication of news and ideas is good as, it is a medium which is easily within the reach of common man and also they are very habitual to it.
(iii) Prenatal sex determination is bad because people are misusing it. Some of the people after determination of sex of child, think to abort. They do it especially with girl child.
(iv) Computer for increase in work efficiency is good as using the computer, a man can do much more work with greater efficiency and accuracy.
(v) Putting artificial satellite into orbits around the Earth is good for development as these satellites serve many purpose like remote sensing, weather foresting.
(vi) Development of nuclear weapons is bad as they can be used in mass destruction.
(vii) Development of new and powerful tool of chemical and biological warfare are bad, as they can also be used for mass destruction.
(viii) Purification of water for drinking purpose is good as we can save ourself from the diseases which we can have due to drinking of the water.
(ix) Plastic surgery is good as with the help of it a man or women can remove the skin defects occurring due to accident or some other reasons. It has some bad effects too but they are not very considerable.
(x) Cloning is good as far as animals are concerned. With the help of it, we can develop some species of animals which can be used to serve some specific purpose. But it is not good for human beings.

Generic 3

6 x 3 = 18

12.

(I) Deepa's uncle is not educated and he is comparing the period of his early life when he could no have communication system, computers, LED's and LCDs. etc. with his present period.
(ii) Sympathy, helping, awareness and intelligence are the values displayed by Deepa.
(iii) Names of Indian Scientists are:
(a) H.J. Bhaba
(b) S.N. Bose
(c) CV. Raman
(d) J.C Bose

13.

For progress every leader has to be a thinker at a higher level in his field than ordinary man. This is more so in case of physicists as the technological development meant for uplifting the living condition of mankind is dependent on the far sight of the physicists in particular. The physicist must think at a level which is philosophical and mathematically quantifying so that they can visualise the requirement of people at least a quarter of century in advance.

14.

Many phenomena at microscopic level are not explained by classical theory. So quantum theory is needed, e.g., photoelectric effect, interaction among elementary particles.

15.

Physics is not a purely abstract science devoid of philosophy. Institution and philosophy have provided back-bone to physics. Physicists are natural philosophers and Einstein is an example to quote.

16.

Mass-energy equivalence was propounded by Albert Einstein. It states that energy and mass are interconvertible.
Example. Ane: (electron) collides with an e' (positron) and the two annihilate giving two photons. The total mass of e: and e" is converted into energy.

17.

The explanation given in option (b) strikes as a scientific explanation.

Multiple Choice Question

10 x 1 = 10

18.