MCQ Questions for Class 11 Physics: Ch 1 Physical World

MCQ Questions for Class 11 Physics: Ch 1 Physical World

1. Who discovered radioactivity?
(a) Einstein
(b) Henri Becquerel
(c) Newton
(d) C.V.Raman
► (b) Henri Becquerel

2. The wave nature of electrons is used in which of the following devices?
(a) Photocell
(b) Electron microscope
(c) Tokamak
(d) Aeroplane
► (b) Electron microscope

3. The basic laws of physics are universal means
(a) The same laws apply in widely different contexts
(b) The same laws do not apply on mars and stars
(c) The same laws apply in similar contexts
(d) The same laws apply in different continents
► (a) The same laws apply in widely different contexts

4. “Politics is the art of the possible. Similarly, Science is the art of the soluble”. Which of the following statements is a case of this aphorism?
(a) A scientist looks for solutions that can be readily tested, implemented and are practical
(b) A scientist looks for solutions that can are impossible to verify
(c) A scientist looks for solutions that derive from other unproven hypothesis
(d) A scientist looks for solutions that are abstract and unintelligible but elegant
► (a) A scientist looks for solutions that can be readily tested, implemented and are practical

5. The fundamental force with the shortest range is
(a) Gravitational Force
(b) Weak Nuclear Force
(c) Strong Nuclear Force
(d) Electromagnetic Force
► (b) Weak Nuclear Force

6. The phenomenon of Photoelectric effect is used in
(a) Photocell
(b) Sonar
(c) Electron Microscope
(d) Optical fibers
► (a) Photocell

7. What is central to the growth of physics?
(a) Qualitative descriptions
(b) Conjectural descriptions
(c) Speculative descriptions
(d) Quantitative measurement
► (d) Quantitative measurement

8. According to Einstein’s theory, mass and energy are related as
(a) E = m/c
(b) E = mc2
(c) E = mc
(d) E = m/c2
► (b) E = mc2

9. Which is the strongest fundamental force of nature?
(a) Gravitational force
(b) Weak nuclear force
(c) Strong nuclear force
(d) Electromagnetic force
► (c) Strong nuclear force

10. A scientific theory is accepted if
(a) The theory is approved by a panel of people after studying the theory only
(b) The theory is derivable from other theories logically.
(c) The theory is very simple elegant or very complicated
(d) Predictions of the theory are confirmed by experiments
► (d) Predictions of the theory are confirmed by experiments

11. The difference between nuclear forces and electromagnetic forces is that
(a) Nuclear forces have longer range compared to electromagnetic forces
(b) Nuclear forces are mediated by photons compared to gluons for electromagnetic forces
(c) Nuclear forces do not depend on charge
(d) Nuclear forces are weaker compared to electromagnetic forces
► (c) Nuclear forces do not depend on charge

12. Which force operates among the heavier elementary particles?
(a) Strong nuclear force
(b) Electromagnetic force
(c) Gravitational force
(d) Weak nuclear force
► (a) Strong nuclear force

13. No physicist has ever “seen” an electron. Yet, all physicists believe in the existence of electrons. An intelligent but superstitious man advances this analogy to argue that ‘ghosts’ exist even though no one has seen one. How will you refute his argument ?
(a) Science does not deal with ghosts because they don’t exist
(b) Electrons have been discovered by great scientists but no great scientist claimed to find ghosts
(c) There is no scientific study of ghosts so they cannot exist
(d) Existence of electrons can be demonstrated by experiments but existence of ghosts cannot be
► (d) Existence of electrons can be demonstrated by experiments but existence of ghosts cannot be

14. Which of these were not major technological advances during industrial revolution in England and Europe?
(a) Power loom
(b) The cotton gin
(c) Satellite communication
(d) Steam engine
► (c) Satellite communication

15. What is the correct sequence of events technology gives rise to new science or new science gives rise to technology?
(a) Science can give rise to technology only
(b) Technology and science are independent
(c) Both can happen. Science can give rise to technology and technology can give rise to new science
(d) Technology can give rise to new science only
► (c) Both can happen. Science can give rise to technology and technology can give rise to new science

16. In every conservation principle
(a) A physical quantity like mass is converted into energy
(b) A physical quantity changes to a form of energy
(c) A physical quantity for example total momentum does not change in a phenomenon. The quantity has the same value before and after the phenomenon.
(d) A physical quantity like energy is converted into mass
► (c) A physical quantity for example total momentum does not change in a phenomenon. The quantity has the same value before and after the phenomenon.

17. Which scientist does not belong to Germany?
(a) Heinrich Hertz
(b) Werner Heisenberg
(c) Wilhelm Roentgen
(d) Niels Bohr
► (d) Niels Bohr

18. On which laws, is the principle of rocket propulsion based?
(a) Newton’s first law of motion
(b) Newton’s law of gravitation
(c) Laws of thermodynamics
(d) None of the Above
► (d) None of the Above

19. The word Science originates from the Latin verb Scientia meaning
(a) To observe
(b) To know
(c) To experience
(d) To see
► (b) To know

20. What is the relation between morality and science?
(a) Morality can be derived from scientific principles
(b) Morality is not the subject matter of science
(c) Science has proved that morality is impractical
(d) Science is immoral
► (b) Morality is not the subject matter of science

21. The sun releases energy coming from
(a) Weak electrical forces
(b) Gravitational forces
(c) Electromagnetic waves
(d) Strong nuclear forces
► (d) Strong nuclear forces

22. To get the law of free fall under gravity, it is better
(a) To create a real world experiment of feather and stone
(b) To create a situation where in the air resistance is not negligible
(c) To create a situation where in the air resistance is negligible
(d) None of the Above
► (d) None of the Above

23. Who discovered ultra-short radio waves?
(a) James Clerk Maxwell
(b) J.J Thomas
(c) J.C.Bose
(d) Marie Curie
► (c) J.C.Bose

24. Scientists strategy in general is to
(a) Focus first on the essential features of a phenomenon and remove its less significant aspects.
(b) Keep building complicated theories
(c) Focus first on the complex features of a phenomenon and add its less significant aspects from the start
(d) Focus first on the complex features of a phenomenon and remove its less significant aspects
► (a) Focus first on the essential features of a phenomenon and remove its less significant aspects.

25. A scientific theory
(a) Is changed to suit new fashion among scientists
(b) Cannot be changed but can be reformulated
(c) Is fixed once and for all because it is logical
(d) Can be revised if required to fit new phenomenon or data
► (d) Can be revised if required to fit new phenomenon or data

26. The scientific method is
(a) A prescribed method for investigating phenomena, acquiring new knowledge...
(b) A body of techniques for investigating phenomena, acquiring new knowledge...
(c) A procedure for proposing new hypothesis
(d) A method for proposing new theories.
► (b) A body of techniques for investigating phenomena, acquiring new knowledge...

27. The microscopic domain of physics deals with
(a) The constitution and structure of matter at the scales of atoms and nuclei and their interaction with different elementary particles
(b) The constitution and structure of matter at the scales of atoms and nuclei and their interaction with different bodies on the earth
(c) The constitution and structure of matter at the scales of stars and planets and their interaction with different elementary particles
(d) None of the Above
► (a) The constitution and structure of matter at the scales of atoms and nuclei and their interaction with different elementary particles

28. Proper framework for explaining microscopic phenomena is
(a Quantum Theory
(b) Theory of relativity
(c) Maxwell’s theory
(d) Classical physics
► (b) Quantum Theory

29. The major contribution of C.V. Raman was
(a) Measurement of electronic charge
(b) Inelastic scattering of light by molecules
(c) Nuclear model of atom
(d) Model of hydrogen atom
► (b) Inelastic scattering of light by molecules

30. One example where technology predates science is
(a) TV
(b) Steam engine
(c) Radio
(d) Laser surgery
► (b) Steam engine
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