Class 12th Physics Model Question Paper 2024-25

Time: 3 Hours      Class: 12th      Subject: Physics      Max Marks: 70

Question number 1 contains 28 parts of one mark each. Question number 2 to 8 are of two marks each. Question number 9 to 15 are of three marks each. Question number 16 (Comprehension) is of five marks. Question number 17 and 18 are of five marks each with internal choice. All questions are compulsory.

1. One mark questions:

1. The SI unit of electric field intensity is:
   • (a) Volt per meter
   • (b) Newton
   • (c) Tesla
   • (d) Joule
2. A charge placed in a uniform electric field experiences:
   • (a) Torque
   • (b) Force
   • (c) Both torque and force
   • (d) Neither
3. The force between two charges is inversely proportional to:
   • (a) Distance
   • (b) Square of distance
   • (c) Cube of distance
   • (d) None
4. The power of a concave lens is always:
   • (a) Positive
   • (b) Negative
   • (c) Zero
   • (d) Depends on object
5. An ideal transformer works on the principle of:
   • (a) Electrostatic induction
   • (b) Electromagnetic induction
   • (c) Mutual capacitance
   • (d) None of these
6. True/False: A charged particle moving parallel to a magnetic field experiences no force.
7. True/False: The resistance of a conductor decreases with an increase in temperature.
8. True/False: Light waves are longitudinal waves.
9. Fill in the blank: The phenomenon of bending of light around corners is called _______.
10. Fill in the blank: The focal length of a convex lens is _______ for a given medium.
11. True/False: A galvanometer can be converted into an ammeter by connecting a high resistance in parallel.
12. True/False: The capacitance of a capacitor depends on the area of its plates.
13. The value of permeability of free space is approximately:
    • (a) 4π × 10^-7 H/m
    • (b) 8.85 × 10^-12 C²/N·m²
    • (c) 9 × 10^9 N·m²/C²
    • (d) None
14. The work done in moving a charge on an equipotential surface is:
    • (a) Zero
    • (b) Maximum
    • (c) Negative
    • (d) Positive
15. What is the ratio of charge to mass of an electron?
    • (a) 1.6 × 10^-19 C/kg
    • (b) 1.76 × 10^11 C/kg
    • (c) 9.1 × 10^-31 kg
    • (d) None
16. The speed of electromagnetic waves in a vacuum is approximately:
    • (a) 3 × 10^8 m/s
    • (b) 5 × 10^6 m/s
    • (c) 1.5 × 10^8 m/s
    • (d) None
17. True/False: Electric field inside a conductor is always zero.
18. True/False: The magnitude of induced EMF is directly proportional to the rate of change of flux.
19. Fill in the blank: A device used to store electrical energy is called a _______.
20. Fill in the blank: The refractive index of air is approximately _______.

Class 12 Chemistry Sample Paper 2024-25 : Download here

2. Two mark questions:

1. State Coulomb's law in electrostatics.
2. Define electric flux. Write its SI unit.
3. What is the difference between drift velocity and mobility of charge carriers?
4. State and explain Kirchhoff's voltage law.
5. Define mutual inductance. Write the factors on which it depends.
6. Explain the principle of a moving coil galvanometer.
7. Write any two differences between series and parallel circuits.
8. What is nuclear fusion? Give one example.

3. Three mark questions:

1. Explain the working of a capacitor and derive an expression for its capacitance.
2. Derive an expression for energy stored in a charged capacitor.
3. State Biot-Savart law and explain its application in finding the magnetic field at the center of a circular current loop.
4. What do you mean by resonance in an LCR circuit? Derive the resonant frequency formula.
5. Explain the working of a transformer and derive its efficiency.
6. Draw a neat diagram of a convex lens and explain image formation when the object is placed beyond 2F.
7. Define photoelectric effect. State Einstein’s photoelectric equation.
8. Explain why the sky appears blue.

4. Comprehension (5 marks):

Read the passage carefully and answer the questions below:

The sun is the ultimate source of energy for our planet. It emits energy in the form of electromagnetic radiation. This energy travels through space and reaches Earth, where it powers life and weather systems. The visible light component of sunlight is responsible for photosynthesis in plants, while its infrared component warms the planet's surface.

1. What is the main source of energy for the Earth? (1)
2. Name the form of energy emitted by the sun. (1)
3. Which component of sunlight is responsible for photosynthesis? (1)
4. What is the role of the infrared component of sunlight? (1)
5. Mention one importance of visible light. (1)

5. Five mark questions:

1. (a) State Gauss’s theorem. Using it, derive the expression for electric field intensity due to an infinitely long straight charged wire.
   OR
   (b) Define capacitance. Derive an expression for the capacitance of a spherical conductor.
2. (a) Explain the working of an astronomical telescope with a neat diagram. Derive the expression for its magnifying power.
   OR
   (b) What is interference of light? Derive the conditions for constructive and destructive interference in Young’s double-slit experiment.