CBSE Class 12 Physics 2025 Practice Sample Paper by Experts for Last Minute Revision (with Solution)

Section

Question Type

Number of Questions

Marks per Question

Total Marks

Section A

Multiple Choice Questions (MCQs)

12

1

12

Assertion-Reasoning Based Questions

4

1

4

Section B

Short Answer Questions

5

2

10

Section C

Short Answer Questions

7

3

21

Section D

Case Study-Based Questions

2

4

8

Section E

Long Answer Questions

3

5

15

Total

33

70

SECTION A: Multiple Choice Questions (MCQs) [1 Mark Each]

Q1. Two positive ions, each carrying a charge q, are separated by a distance d. If F is the force of repulsion between the ions, the number of electrons missing from each ion is:
(A) q/e
(B) F/q
(C) d/q
(D) q/d

Answer: (A) q/e

Q2. The total electric flux emanating from an alpha particle is:
(A) 2e/𝞮₀
(B) e/𝞮₀
(C) 4e/𝞮₀
(D) e²/𝞮₀

Answer: (C) 4e/𝞮₀

Q3. The electric field due to a point charge at a given distance varies:
(A) Inversely with distance
(B) Inversely with square of the distance
(C) Directly with distance
(D) Does not vary

Answer: (B) Inversely with square of the distance

Q4. Which of the following does not obey Ohm’s Law?
(A) Copper wire
(B) Silicon diode
(C) Resistor
(D) Nichrome wire

Answer: (B) Silicon diode

Q5. The capacitance of a parallel plate capacitor increases when:
(A) The plate area increases
(B) The separation between plates increases
(C) A conductor is placed between the plates
(D) Air is removed from between the plates

Answer: (A) The plate area increases

Q6. The force experienced by a charged particle moving perpendicular to a uniform magnetic field is given by:
(A) qE
(B) qvB
(C) qvB sinθ
(D) qvB cosθ

Answer: (C) qvB sinθ

Q7. A transformer works on the principle of:
(A) Electrostatic Induction
(B) Electromagnetic Induction
(C) Magnetic Effect of Current
(D) Conservation of Charge

Answer: (B) Electromagnetic Induction

Q8. The energy of a photon of light is directly proportional to its:
(A) Wavelength
(B) Frequency
(C) Amplitude
(D) Speed

Answer: (B) Frequency

Q9. The power loss in a transformer is mainly due to:
(A) Mechanical Friction
(B) Heat Dissipation in Windings
(C) Magnetic Flux Leakage
(D) Both B and C

Answer: (D) Both B and C

Q10. In an intrinsic semiconductor, the number of electrons and holes:
(A) Are equal
(B) Electrons are more
(C) Holes are more
(D) None of the above

Answer: (A) Are equal

Q11. The minimum energy required to remove an electron from the surface of a metal is called:
(A) Kinetic Energy
(B) Potential Energy
(C) Work Function
(D) Photoelectric Energy

Answer: (C) Work Function

Q12. Which of the following logic gates outputs 1 when any one of its inputs is 1?
(A) AND Gate
(B) OR Gate
(C) NAND Gate
(D) NOR Gate

Answer: (B) OR Gate

Assertion-Reasoning Based Questions [1 Mark Each]

For the following questions, choose the correct answer:
(A) Both A and R are true, and R is the correct explanation of A
(B) Both A and R are true, but R is NOT the correct explanation of A
(C) A is true, but R is false
(D) A is false, but R is true

Q13.
Assertion (A): The charge on a body can only be changed in integral multiples of the elementary charge e.
Reason (R): Charge is quantized.

Answer: (A) Both A and R are true, and R is the correct explanation of A

Q14.
Assertion (A): Coulomb’s force is the dominating force in the universe.
Reason (R): Coulomb’s force is weaker than gravitational force.

Answer: (D) A is false, but R is true

Q15.
Assertion (A): A metallic shield in the form of a hollow conductor can block an external electric field.
Reason (R): In a hollow spherical conductor, the electric field inside is always zero.

Answer: (A) Both A and R are true, and R is the correct explanation of A

Q16.
Assertion (A): The range of gravitational force and Coulomb force is infinite.
Reason (R): The Coulomb force is stronger than the gravitational force.

Answer: (B) Both A and R are true, but R is NOT the correct explanation of A

Section B: 2 Marks Questions

Q17. Define magnetic susceptibility of a material. Name two elements, one having positive susceptibility and the other having negative susceptibility. What does negative susceptibility signify?
Answer:

• Magnetic susceptibility (χ) is the measure of how much a material will become magnetized in an applied magnetic field.
• Element with positive susceptibility: Iron (paramagnetic/ferromagnetic)
• Element with negative susceptibility: Copper (diamagnetic)
• Negative susceptibility signifies that the material develops a weak magnetic moment in the direction opposite to the applied field (diamagnetic behavior).

Q18. Why do electrostatic field lines not form closed loops?
Answer:

• Electrostatic field lines do not form closed loops because they originate from positive charges and terminate at negative charges.
• This indicates that electrostatic forces are conservative, meaning work done in moving a charge in a closed loop is zero.

OR

Differentiate between n-type and p-type semiconductors based on their charge carriers.
Answer:

• n-type semiconductor: Majority charge carriers are electrons, and doping is done with pentavalent atoms (e.g., phosphorus).
• p-type semiconductor: Majority charge carriers are holes, and doping is done with trivalent atoms (e.g., boron).

Q19. A convex lens is made of glass with refractive index 1.5. It is immersed in a liquid with refractive index 1.6. How will the behavior of the lens change?
Answer:

• Since the refractive index of the liquid is higher than that of the lens, the convex lens will behave as a diverging lens instead of a converging one.

Download PDF | CBSE Class 12 Physics Additional Sample Paper by Experts for 2025 Boards