Class 11 Physics Assignment

Chapter: Physical World

Conceptual MCQs with Solutions | NCERT + JEE Foundation Level

Q1. Physics is mainly concerned with the study of:

A) Living organisms only

B) Matter, energy, space and time

C) Chemical reactions only

D) Social behaviour

View Solution

Physics studies nature at fundamental level, including matter, energy, motion, space, time and interactions.

Answer: B

Q2. Which branch of Physics deals with motion of bodies under the action of forces?

A) Optics

B) Thermodynamics

C) Mechanics

D) Electrodynamics

View Solution

Mechanics deals with motion, rest and the effect of forces on bodies.

Answer: C

Q3. The study of light and its phenomena is called:

A) Optics

B) Acoustics

C) Mechanics

D) Nuclear Physics

View Solution

Optics is the branch of Physics that studies light, reflection, refraction, lenses and optical instruments.

Answer: A

Q4. Which of the following represents a unification in Physics?

A) Heat and temperature treated as unrelated

B) Electricity and magnetism combined as electromagnetism

C) Motion and rest studied separately

D) Light and sound treated as same wave

View Solution

Maxwell unified electricity and magnetism into a single theory called electromagnetism.

Answer: B

Q5. The reductionist approach in Physics means:

A) Studying complex systems by breaking them into simpler parts

B) Ignoring small particles

C) Studying only planets

D) Rejecting experiments

View Solution

Reductionism tries to understand complex phenomena through simpler basic laws and components.

Answer: A

Q6. Which one is a fundamental force in nature?

A) Frictional force

B) Tension

C) Gravitational force

D) Normal reaction

View Solution

Gravitational force is one of the four fundamental forces. Friction, tension and normal reaction are derived contact forces.

Answer: C

Q7. The weakest fundamental force is:

A) Strong nuclear force

B) Electromagnetic force

C) Gravitational force

D) Weak nuclear force

View Solution

Among the four fundamental forces, gravitational force is the weakest.

Answer: C

Q8. The strongest fundamental force is:

A) Gravitational force

B) Electromagnetic force

C) Weak nuclear force

D) Strong nuclear force

View Solution

Strong nuclear force is the strongest fundamental force and binds protons and neutrons inside the nucleus.

Answer: D

Q9. Which force is responsible for beta decay?

A) Strong nuclear force

B) Weak nuclear force

C) Gravitational force

D) Friction

View Solution

Beta decay is governed by the weak nuclear force.

Answer: B

Q10. The force responsible for holding nucleons together in a nucleus is:

A) Gravitational force

B) Strong nuclear force

C) Electrostatic force only

D) Magnetic force only

View Solution

Protons repel each other electrically, but strong nuclear force binds protons and neutrons together.

Answer: B

Q11. Which conservation law is associated with homogeneity of time?

A) Conservation of linear momentum

B) Conservation of angular momentum

C) Conservation of energy

D) Conservation of charge

View Solution

Homogeneity of time means laws do not change with time. This leads to conservation of energy.

Answer: C

Q12. Conservation of linear momentum is associated with:

A) Homogeneity of space

B) Isotropy of space

C) Homogeneity of time

D) Quantisation of charge

View Solution

Homogeneity of space means laws are same at all positions. It leads to conservation of linear momentum.

Answer: A

Q13. Conservation of angular momentum is related to:

A) Homogeneity of time

B) Isotropy of space

C) Conservation of mass only

D) Law of gravitation only

View Solution

Isotropy of space means all directions in space are equivalent. This leads to conservation of angular momentum.

Answer: B

Q14. Which one is not a fundamental force?

A) Electromagnetic force

B) Gravitational force

C) Strong nuclear force

D) Spring force

View Solution

Spring force is a derived force due to electromagnetic interactions at atomic level, not a fundamental force.

Answer: D

Q15. Physics, technology and society are related because:

A) Technology often applies Physics principles

B) Physics has no role in society

C) Society does not use technology

D) Technology is independent of science

View Solution

Many technologies such as electricity, communication, medical imaging and transport are based on Physics principles.

Answer: A

Q16. Radar is mainly based on:

A) Sound waves only

B) Electromagnetic waves

C) Gravitational waves

D) Nuclear force

View Solution

Radar uses radio waves, which are electromagnetic waves, to detect objects.

Answer: B

Q17. Which invention is based on electromagnetic induction?

A) Electric generator

B) Simple pendulum

C) Spring balance

D) Mercury thermometer

View Solution

Electric generators work on Faraday's law of electromagnetic induction.

Answer: A

Q18. The scientific method mainly involves:

A) Guessing without testing

B) Observation, hypothesis, experiment and conclusion

C) Memorising facts only

D) Ignoring evidence

View Solution

Science progresses through observation, forming hypotheses, testing by experiments and drawing conclusions.

Answer: B

Q19. A law of Physics is considered valid when it:

A) Cannot be tested

B) Agrees with repeated experiments

C) Is based only on opinion

D) Is complicated

View Solution

A physical law is accepted when it consistently agrees with experiments and observations within its range of validity.

Answer: B

Q20. Which statement best describes Physics?

A) It is the study of only machines

B) It is a fundamental science that explains natural phenomena

C) It only studies living systems

D) It avoids mathematical reasoning

View Solution

Physics is a fundamental science that attempts to explain natural phenomena using experiments, concepts and mathematics.

Answer: B

Q21. Which of the following has the shortest range?

A) Gravitational force

B) Electromagnetic force

C) Strong nuclear force

D) Weak nuclear force

View Solution

Weak nuclear force has extremely short range, smaller than the already short-ranged strong nuclear force.

Answer: D

Q22. Which force has infinite range?

A) Strong nuclear force

B) Weak nuclear force

C) Gravitational force

D) Contact force only

View Solution

Gravitational force has infinite range, though it becomes weaker with distance.

Answer: C

Q23. Which pair of forces has infinite range?

A) Gravitational and electromagnetic

B) Strong and weak nuclear

C) Friction and tension

D) Normal and spring force

View Solution

Both gravitational and electromagnetic forces have infinite range.

Answer: A

Q24. A correct example of macroscopic domain in Physics is:

A) Electron inside atom

B) Nucleus

C) Motion of planets

D) Quarks

View Solution

Macroscopic domain deals with large-scale phenomena such as motion of planets, fluids and machines.

Answer: C

Q25. A correct example of microscopic domain is:

A) Motion of a car

B) Planetary motion

C) Atomic structure

D) Motion of a cricket ball

View Solution

Microscopic domain deals with atoms, molecules, nuclei and elementary particles.

Answer: C

Q26. Which theory mainly explains microscopic phenomena?

A) Classical mechanics

B) Quantum mechanics

C) Geometrical optics only

D) Fluid mechanics

View Solution

Quantum mechanics is needed to explain atomic and subatomic microscopic phenomena.

Answer: B

Q27. Newtonian mechanics generally works well for:

A) Ordinary objects moving much slower than light

B) Electrons inside atoms only

C) Objects moving at speed of light only

D) Nuclear reactions only

View Solution

Newtonian mechanics works well for macroscopic bodies moving with speeds much smaller than speed of light.

Answer: A

Q28. Which branch studies heat, temperature and energy transfer?

A) Optics

B) Thermodynamics

C) Electromagnetism

D) Acoustics

View Solution

Thermodynamics deals with heat, temperature, work, internal energy and energy transfer.

Answer: B

Q29. Which of the following is an example of Physics helping medicine?

A) X-ray imaging

B) Crop rotation

C) Literary writing

D) Soil ploughing

View Solution

X-ray imaging, MRI and ultrasound are applications of Physics in medical diagnosis.

Answer: A

Q30. The aim of Physics is to:

A) Describe nature without rules

B) Find basic laws and use them to explain natural phenomena

C) Avoid experiments

D) Study only engineering machines

View Solution

Physics aims to discover fundamental laws of nature and apply them to understand and predict phenomena.

Answer: B