Top 50 CBSE Class 12 Physics MCQs with Answers for High Score in Pre Board Exam 2026

The CBSE Class 12 Physics exam is a defining milestone in a student’s academic journey, serving as a gateway to prestigious careers in engineering, medicine, and pure sciences. Unlike many other subjects, Physics demands a unique blend of theoretical depth, mathematical precision, and the ability to apply abstract laws to real-world phenomena. Success in the 2026 Pre-Board Examinations hinges on a student's mastery over complex derivations, numerical problem-solving, and conceptual understanding of the physical universe.

To facilitate a streamlined and high-impact revision process, this collection of the Top 50 Important MCQs for CBSE Class 12 Physics with Answers has been meticulously curated in alignment with the latest NCERT curriculum and CBSE assessment guidelines. These questions span the entire syllabus from the intricacies of Electrostatics and Magnetism to the modern realms of Optics and Nuclei.

Why Practice These CBSE Class 12 Physics MCQs?

• Conceptual Clarity: Objective questions often target the subtle nuances of physical laws that are easily overlooked in long-form answers.

• Time Management: Practicing MCQs helps students develop the speed required to navigate Section A efficiently, leaving more time for complex derivations.

• Foundation for Competitive Exams: These questions are designed to mirror the logical rigor found in entrance exams like JEE and NEET.

• Self-Assessment: Identifying patterns in incorrect answers allows students to pinpoint specific weak areas in chapters like Alternating Current or Semiconductor Electronics.

Engaging with these Top 50 MCQs will not only sharpen your analytical skills but also provide the confidence needed to excel in the upcoming 2026 CBSE Class 12 Physics Pre-Board Exams.

Top 50 MCQs for Class 12 Physics Pre-Board Exam 2026

1.The property which differentiates two kinds of charges is called ____________.

a. Equality of charge

b. Polarity of charge

c. Fraction of charge

d. None of the option

2. What happens when a glass rod is rubbed with silk?

a. gains protons from silk

b. gains electrons from silk

c. gives electrons to silk

d. gives protons to silk

3. The work done against electrostatic force gets stored in which form of energy?

a. Thermal energy

b. Kinetic energy

c. Potential energy

d. Solar energy

4. The capacity of the parallel plate capacitor increases when

a. area of the plate is decreased

b. area of the plate is increased

c. distance between the plates increases

d. None of the option

5. The unit of conductance is __________.

a. Dyne 

b. Siemen

c. Ohm

d. Volts

6. State true or false: The total resistance in the series combination is more than the greatest resistance in the circuit.

a. True

b. False

7. Magnetic field can be produced due to ____ 

a. A charge at rest

b. A changing electric field

c. A moving charge

d. Both b and c  

8. A particle of charge e and mass m moves with a velocity v in a magnetic field B applied perpendicular to the motion of the particle. The radius r of its path in the field is

a. mv/Be

b. Be/mv

c. ev/Bm

d. Bv/em

9. A magnetic needle is kept in a non-uniform magnetic field. It experiences

(a) a torque but not a force.

(b) neither a force nor a torque.

(c) a force and a torque.

(d) a force but not a torque.

10. If a bar magnet is broken into two halves we get the two similar bar magnets with somewhat

a) Same properties

b) Stronger properties

c) Weaker properties

d) None

11. Magnetic lines of force due to a bar magnet do not intersect because

a) a point always has a single net magnetic field

b) the lines have similar charges and so repel each other

c) the lines always diverge from a single force

d) the lines need magnetic lenses to be made to interest

12. The SI unit of magnetic flux is

a. Dyne

b. Tesla

c. Weber

d. Ohm

13. Which of the following factors is the induced charge in an electromagnetic induction independent of?

a. Time

b. Resistance of the coil

c. Change of flux

d. None of the above

14. Electrical Inertia is the measure of

a. Self Inductance 

b. Mutual Inductance

c. Impedance

d. None of the above

15. Which of the following rules is used to identify the direction of the current induced in a wire moving in a magnetic field?

a. Ampere’s Rule

b. Fleming’s Left-Hand Rule

c. Fleming’s Right-Hand Rule

d. None of the above

16. The induced emf is equal to the coefficient of self-inductance is equal to unity, when the rate of change of current is unity.

a. True

b. False

17. What is the frequency of the AC Mains in India? 

a. 60 Hz 

b. 50 Hz

c. 40 Hz

d. 30 Hz

18. Which of the following circuits exhibits maximum power dissipation?

a. Pure Inductive Circuit

b. Pure Capacitive Circuit

c. Pure Resistive Circuit

d. None of the above

19. The impedance in the series LCR circuit is minimum at the resonance frequency.

a. True

b. False

20. The power factor is one for which of the following?

a. Pure capacitor

b. Pure inductor

c. Pure resistor

d. All of the above

21. Which of the following phenomena of light results in a mirage?

a. Refraction of light

b. Reflection of light

c. Total internal reflection

d. Diffraction of light

22. What happens when the light is refracted into a medium?

a. Both frequency and wavelength of the light increase

b. The wavelength increases but the frequency remains unchanged

c. Both wavelength and frequency decrease

d. The wavelength decreases but the frequency remains constant

23. Which of the following phenomena is used in optical fibre?

a. Refraction

b. Diffraction

c. Scattering

d. Total Internal Reflection

24. For a telescope, the larger the diameter of the objective lens

a. Greater the resolving power

b. Greater the magnifying power

c. Smaller the resolving power

d. Smaller the magnifying power

25. How can the fringe width increase in Young’s double-slit experiment?

a. By decreasing the width of the slit

b. By reducing the separation of slits

c. By reducing the wavelength of the slits

d. By decreasing the distance between slits and the screen

26. Which of the following light phenomena confirms the transverse nature of light?

a. Refraction of light

b. Diffraction of light

c. Dispersion of light

d. Polarization of light

27. Which of the following is an application of the Doppler Effect?

a. Doppler Radius

b. Doppler Spectrometer

c. Doppler Velocimeter

d. All of the above

28. Which of the following is conserved when light waves interfere?

a. Intensity

b. Amplitude

c. Phase

d. None of the above

29. What does a cathode ray consist of?

a. Electrons

b. Protons

c. Photons

d. Alpha particles

30. Which of the following does the wave theory of light not explain?

a. Diffraction

b. Photocurrent

c. Polarization

d. Interference

31. Photon does not possess

a. Energy

b. Momentum

c. Rest Mass

d. Frequency

32. Balmer series lies in which spectrum?

a. Ultraviolet

b. Visible

c. Infrared

d. Partially Visible

33. The electrons of Rutherford’s model would be expected to lose energy because

a. They jump on the nucleus

b. They move randomly

c. Radiate electromagnetic waves

d. Escape from the atom

34. The significant result deduced from Rutherford’s scattering experiment is that

a. the whole of the positive charge is concentrated at the centre of an atom

b. there are neutrons inside the nucleus

c. α-particles are hydrogen nuclei

d. electrons are embedded in the atom

35. A radioactive nucleus emits a beta particle, then the parent and daughter nuclei are

a. Isotones

b. Isotopes

c. Isomers

d. Isobars

36. From where do the gamma rays originated?

a. The innermost shell of the nucleus

b. The outermost shell of the nucleus

c. Nucleus

d. The outermost shell of the atom

37. The number of electrons in the valence shell of a semiconductor is

a. 1

b. 2

c. 3

d. 4

38. In a p-type semiconductor, the current conduction is due to

a. Holes

b. Atoms

c. Electrons

d. Protons

39. In a semiconductor, what is responsible for conduction?

a. Electrons only

b. Holes only

c. Both electrons and holes

d. Neither electrons nor holes

40. In intrinsic semiconductors at room temperature, the number of electrons and holes are

a. Unequal

b. Equal

c. Infinite

d. Zero

41. A p-type semiconductor is

a. Positively charged

b. Negatively charged

c. Uncharged

d. None of the above

42. Which of the following is a drawback of the amplitude modulation?

a. Noise Reception

b. Low Efficiency

c. Low Operating range

d. All of the above

43. What happens to the satellite speed when the height of the satellite orbit gets lower?

a. Increases

b. Decreases

c. Remains same

d. Both (a) and (b)

44. What happens if the transmission path in PCM is very long?

a. Pulse amplitude is increased

b. Pulse spacing is reduced

c. Pulse width is increased

d. Repeater stations are used

45. What happens when the radio wave reaches the ionizing medium?

a. Will bend towards normal

b. Will bend away from the normal

c. Will follow a straight path

d. None of these

46. The space waves that are seriously affected by the atmospheric conditions are known as:

a. VHF

b. HUF

c. MF

d. UHF

47. Beta rays emitted by a radioactive material are

a. electromagnetic radiations

b. the electrons orbiting around the nucleus

c. charged particles emitted by nucleus

d. neutral particles 

48. Radioactivity is

a. irreversible process

b. self disintegration process

c. Spontaneous

d. all of the above 

49. When light travels from one medium to another, which of the following does not change? 

a. frequency

b. refractive index

c. velocity

d. wavelength

50. What happens when the light is refracted into a medium?

a. Both frequency and wavelength of the light increase

b. The wavelength increases but the frequency remains unchanged

c. Both wavelength and frequency decrease

d. The wavelength decreases but the frequency remains constant

CBSE Class 12 Physics MCQ Answer Key Table

Practising these Top 50 Important MCQs for CBSE Class 12 Physics with Answers is an effective way for students to strengthen their preparation for the Pre-Board and Board Examinations 2026. These questions help reinforce key concepts, improve problem-solving speed, and enhance accuracy in objective-type questions. Regular revision through MCQs allows students to identify weak areas, revise important formulas, and gain confidence in tackling exam-oriented questions. With consistent practice and smart revision, students can significantly improve their performance and score well in the CBSE Class 12 Physics examination.

Also Check:

CBSE Class 12 Physics Syllabus 2025-26

CBSE Class 12 Physics Deleted Syllabus 2025-26