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Physical World Class 11 MCQs Questions with Answers
Multiple Choice Type
Question 1.
The aeroplane works on the scientific principle
(a) Laws of Thermodynamics
(b) Nuclear Fusion
(c) Electromagnetic Induction
(d) Bernoulli’s Theorem
Answer
Answer: (d) Bernoulli’s Theorem
Question 2.
Nuclear reactor works on the scientific principle
(a) Bernoulli’s Theorem
(b) Nuclear Fission
(c) Electromagnetic Induction
(d) Laws of Thermodynamics
Answer
Answer: (b) Nuclear Fission
Question 3.
Who discovered neutron
(a) Galileo
(b) Chadwick
(c) C.V. Raman
(d) None of them
Answer
Answer: (b) Chadwick
Question 4.
Wave nature of electron was discovered by
(a) Roentgen
(b) Pauli
(c) de Broglie
(d) Einstein
Answer
Answer: (c) de Broglie
Question 5.
Atomicity of charge was discovered by
(a) Faraday
(b) Marie Curie
(c) Maxwell
(d) R.A. Millikan
Answer
Answer: (d) R.A. Millikan
Question 6.
Theory of relativity was discovered by
(a) Maxwell
(b) Faraday
(c) Einstein
(d) Pauli
Answer
Answer: (c) Einstein
Question 7.
Electric generator works on the scientific principle
(a) Laws of Thermodynamics
(b) Nuclear Fusion
(c) Bernoulli’s Theorem
(d) Electromagnetic Induction
Answer
Answer: (d) Electromagnetic Induction
Question 8.
Size of the nucleus is
(a) 10-10 m
(b) 10-14 m
(c) 10-9 m
(d) 10-12 m
Answer
Answer: (b) 10-14 m
Question 9.
The scientists wh” discovered natural radioactivity belonged to
(a) Italy
(b) Austria
(c) France
(d) England
Answer
Answer: (c) France
Question 10.
The scientist who discovered x-rays belonged to:
(a) Germany
(b) Japan
(c) England
(d) France
Answer
Answer: (a) Germany
Question 11.
The scattering of light by molecules was discovered by
(a) J. Bardeen
(b) Einstein
(c) C.V. Raman
(d) Newton
Answer
Answer: (c) C.V. Raman
Question 12.
The scientist who discovered the “Theory of Relativity” belonged to
(a) India
(b) France
(c) Germany
(d) None of these
Answer
Answer: (c) Germany
Question 13.
Which of the following technology uses Newton’s second and third laws of motion
(a) Electric Generator
(b) Radio and Television
(c) Rocket Propulsion
(d) None
Answer
Answer: (c) Rocket Propulsion
Question 14.
Laws of electromagnetic induction were discovered by :
(a) Chadwick
(b) Einstein
(c) Newton
(d) Faraday
Answer
Answer: (d) Faraday
Question 15.
Heat engine and refrigerator work on scientific principle :
(a) Electromagnetic Induction
(b) Bernoulli’s Theorem
(c) Nuclear Fusion
(d) Laws of Thermodynamics
Answer
Answer: (d) Laws of Thermodynamics
Question 16.
Who discovered cosmic rays
(a) J.J. Thomson
(b) Hess
(c) Lawrence
(d) Yukawa
Answer
Answer: (b) Hess
Question 17.
The scientist who discovered cosmic rays belonged to
(a) America
(b) Austria
(c) India
(d) France
Answer
Answer: (b) Austria
Question 18.
The study of the biological specimens are conducted at:
(a) Atomic level
(b) Ionic level
(c) Molecular level
(d) None
Answer
Answer: (c) Molecular level
Question 19.
The physical sciences deal with the study of:
(a) Living things
(b) Non-living things
(c) Both
(d) None
Answer
Answer: (b) Non-living things
Question 20.
The branch of science which deals with the study of stars is called
(a) Astronomy
(b) Geology
(c) Meterology
(d) Seismology
Answer
Answer: (a) Astronomy
Fill in the blanks:
Question 1.
……………… was discovered by Huygen.
Answer
Answer: Wave theory of light
Question 2.
……………… was discovered by Hubble.
Answer
Answer: Expansion of universe
Question 3.
……………… is always attractive while ……………… force can be attractive or repulsive.
Answer
Answer: Gravity, electromagnetic
Question 4.
Matter is mostly electrically ……………… thus the electric force is largely ……………… and the gravitational force ……………… terrestrial phenomena.
Answer
Answer: neutral, zero, dominates
Question 5.
Unification of weak and electromagnetic interactions was discovered by ………………
Answer
Answer: Abdus Salam
Question 6.
Abdus Salam belongs to ………………
Answer
Answer: Pakistan
Question 7.
The weak force are ……………… times stronger than the gravitational forces.
Answer
Answer: 1025
Question 8.
The electromagnetic force are ……………… times stronger than the gravitational forces and ……………… stronger than the weak forces.
Answer
Answer: 1036, 1011
Question 9.
The π-meson is the fieid particle of ……………… force while ……………… is the field particle of electromagnetic force.
Answer
Answer: strong, photon
Question 10.
……………… is the long range force while ……………… is the short range force.
Answer
Answer: electromagnetic force, strong force.
Question 11.
……………… is a central as well as a conservative force.
Answer
Answer: electromagnetic force.
True/False Type Questions
Question 1.
T.V. is based on the laws of thermodynamics and heat engine on electromagnetic waves.
Answer
Answer: False
Question 2.
Digital logic is the basis for Computer and Third law of motion is the principle of rocket launching.
Answer
Answer: True
Question 3.
The nuclear reaction is the basis of nuclear reactor and laws of thermodynamics are the basis of thermal power plant.
Answer
Answer: True
Question 4.
Newton’s laws of motion are used in laser and light amplification in rocket propulsion.
Answer
Answer: False
Question 5.
A. Einstein received noble prize for E = mc² and Raman for hydrogen spectra.
Answer
Answer: False.
Question 6.
Biological sciences deal with the study of living things.
Answer
Answer: True
Question 7.
Telephone was discovered by Grahm Bel.
Answer
Answer: True
Question 8.
Electric bulb and telegraphy were discovered by Edison.
Answer
Answer: True
Question 9.
Wave theory of light was discovered by de-Broglie.
Answer
Answer: False
Question 10.
Theory of nuclear forces was discovered by H. Yukawa.
Answer
Answer: True
Match Type Questions
Match the scientist’s name against his discovery.
| Scientist | Discovery |
| Faraday | (a) Inelastic scattering of light by molecules |
| Bohr | (b) Law of gravitation |
| Rutherford | (c) Atomic theory |
| Chandwick | (d) Expansion of universe |
| Maxwell | (e) Theory of relativity |
| Einstein | (f) Unification of light and electromagnetism |
| Hubble | (g) Discovery of neutron |
| Dirac | (h) Nuclear model of atom |
| Newton | (i) Quantum Theory of hydrogen atom |
| Raman | (j) Laws of electromagnetic Induction |
Answer
Answer:
| Scientist | Discovery |
| Faraday | (j) Laws of electromagnetic Induction |
| Bohr | (i) Quantum Theory of hydrogen atom |
| Rutherford | (h) Nuclear model of atom |
| Chandwick | (g) Discovery of neutron |
| Maxwell | (f) Unification of light and electromagnetism |
| Einstein | (e) Theory of relativity |
| Hubble | (d) Expansion of universe |
| Dirac | (c) Atomic theory |
| Newton | (b) Law of gravitation |
| Raman | (a) Inelastic scattering of light by molecules |
Match the technology in Column A to its related scientific principle in Column B.
| Technology | Scientific Principle |
| (1) Hydrolelectric power | (a) Thermodynamics |
| (2) Computer | (b) Amplification by population inversion |
| (3) Nuclear reactors | (c) Digital logic of electronic circuits |
| (4) Steam engine | (d) Fission of Uranium |
| (5) Aeroplane | (e) Super conductivity |
| (6) Rocket Propulsion | (f) Faraday’s laws of induction |
| (7) Radio and T.V. | (g) Propagation of electro-magnetic waves |
| (8) Electric generator | (h) Bernoulli’s principle |
| (9) Lasers | (i) Newton’s law of motion |
| (10) Production of ultra high magnetic field | (j) Conversion of gravitational potential energy into electric energy |
| (11) Particle accelerators | (k) Motion of charged particles in electromagnetic fields |
Answer
Answer:
| Technology | Scientific Principle |
| (1) Hydrolelectric power | (j) Conversion of gravitational potential energy into electric energy |
| (2) Computer | (c) Digital logic of electronic circuits |
| (3) Nuclear reactors | (d) Fission of Uranium |
| (4) Steam engine | (a) Thermodynamics |
| (5) Aeroplane | (h) Bernoulli’s principle |
| (6) Rocket Propulsion | (i) Newton’s law of motion |
| (7) Radio and T.V. | (g) Propagation of electro-magnetic waves |
| (8) Electric generator | (f) Faraday’s laws of induction |
| (9) Lasers | (b) Amplification by population inversion |
| (10) Production of ultra high magnetic field | (e) Super conductivity |
| (11) Particle accelerators | (k) Motion of charged particles in electromagnetic fields |
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