Why Physics is Important for JEE Main

In the JEE Main exam, Physics contributes:

• 25 Questions

• 100 Marks

Most questions come from important chapters like:

• Mechanics

• Thermodynamics

• Electricity & Magnetism

• Modern Physics

• Optics

If students focus on these chapters, scoring 70+ marks in Physics becomes possible.

Top 50 Physics Important Questions (MCQs)

Mechanics Questions

1. What is the SI unit of force?
A. Joule
B. Newton
C. Watt
D. Pascal

Answer: Newton

2. Which law states that every action has an equal and opposite reaction?
A. Newton's First Law
B. Newton's Second Law
C. Newton's Third Law
D. Law of inertia

Answer: Newton's Third Law

3. What is the acceleration due to gravity on Earth?
A. 8.9 m/s²
B. 9.8 m/s²
C. 10.5 m/s²
D. 7.8 m/s²

Answer: 9.8 m/s²

4. The unit of work is:
A. Newton
B. Joule
C. Watt
D. Pascal

Answer: Joule

5. What is the formula for kinetic energy?

KE=12mv2KE=\frac{1}{2}mv^2KE=21​mv2

m1m_1m1​

m2m_2m2​

vvv

m1m2

Answer: ½mv²

Thermodynamics Questions

6. What is the SI unit of temperature?
Answer: Kelvin

7. Heat flows from:
A. Cold to hot
B. Hot to cold
C. Both directions
D. None

Answer: Hot to cold

8. What is the first law of thermodynamics based on?
Answer: Law of conservation of energy

9. The SI unit of heat is:
Answer: Joule

10. What is absolute zero temperature?
Answer: 0 Kelvin

Electricity Questions

11. The SI unit of electric current is:
Answer: Ampere

12. The unit of electric resistance is:
Answer: Ohm

13. Ohm’s law formula is:

V=IRV=IRV=IR

III

RRR

V=IR=12V = IR = 12V=IR=12

14. The SI unit of electric charge is:
Answer: Coulomb

15. Which device measures electric current?
Answer: Ammeter

Magnetism Questions

16. The SI unit of magnetic field is:
Answer: Tesla

17. Who discovered electromagnetic induction?
Answer: Michael Faraday

18. Which rule gives the direction of magnetic field around current?
Answer: Right Hand Thumb Rule

19. Magnetic field lines form:
Answer: Closed loops

20. The device that converts electrical energy to mechanical energy is:
Answer: Electric Motor

Modern Physics Questions

21. Who proposed the photoelectric effect theory?
Answer: Albert Einstein

22. The energy of photon is given by:

E=hνE = h\nuE=hν

23. Who discovered the electron?
Answer: J.J. Thomson

24. Who discovered the proton?
Answer: Ernest Rutherford

25. Who discovered the neutron?
Answer: James Chadwick

Optics Questions

26. What is the unit of focal length?
Answer: Meter

27. The speed of light in vacuum is:
Answer: 3 × 10⁸ m/s

28. Which mirror is used in vehicles as rear-view mirror?
Answer: Convex mirror

29. Which lens is used to correct myopia?
Answer: Concave lens

30. Which lens converges light rays?
Answer: Convex lens

Remaining Important Questions

31. SI unit of power → Watt

32. Formula of momentum → p = mv

33. Unit of pressure → Pascal

34. Device that measures voltage → Voltmeter

35. Law of conservation of energy → Energy cannot be created or destroyed

36. Unit of frequency → Hertz

37. Unit of capacitance → Farad

38. Unit of inductance → Henry

39. Unit of magnetic flux → Weber

40. Unit of electric field → N/C

41. Speed of sound in air → 343 m/s

42. Unit of wavelength → Meter

43. SI unit of time → Second

44. SI unit of mass → Kilogram

45. Unit of angular velocity → rad/s

46. Device used to measure pressure → Barometer

47. Lens formula → 1/f = 1/v + 1/u

48. Work formula → W = F × d

49. Energy unit → Joule

50. Gravity formula → F = GMm/r²

JEE Physics Preparation Tips

1. Focus on Conceptual Clarity

Understanding formulas is more important than memorizing them.

2. Solve Previous Year Questions

JEE often repeats similar concepts.

3. Practice Numerical Problems

Practice at least 30–50 numerical questions daily.

4. Revise Important Formulas

Create a formula sheet for quick revision.

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