1. The main function of a diode in a circuit is to
Answer: D. Rectify current
Physics Class 10 FBISE Past Paper MCQs with Answers
59 MCQs from FBISE past papers, in their original option order, with the correct answer. Tap an option to check yourself.
Tap an option to check your answer.
Annual 2026, Set B (Paper code 2SA-I 26004 (B))
2. The critical angle of polystyrene (n = 1.49) is
Answer: D. 42.2°
3. Charging of solids by friction occurs due to the transfer of
Answer: D. Electrons
4. The output of an OR gate is LOW when
Answer: C. All inputs are LOW
5. Warm air rises and cool air sinks in a heated room because of
Answer: C. Convection
6. If the direction of current in a conductor is reversed, the direction of force on it will
Answer: A. Reverse
7. A charge of 10 C flows through a conductor in 5 s. The value of current is
Answer: C. 2 A
8. Linear expansion in solids refers to the change in
Answer: D. Length only
9. Half life of iodine is 8 days. How much of a 40 g sample of iodine will be left after 16 days?
Answer: C. 10 g
10. Compression and rarefaction are features of ______ waves.
Answer: A. Longitudinal
11. Which instrument converts electrical energy into mechanical energy?
Answer: B. Electric motor
Annual 2026, Set D (Paper code 2SA-I 26004 (D))
12. A diode conducts electricity when it is
Answer: C. Forward biased
13. The speed of light in a glass slab (refractive index n = 1.5) is
Answer: B. 2×108 m/s
14. Which type of charge is actually transferred during charging by friction?
Answer: A. Negative charge
15. For a NOR gate, the output is
Answer: C. X = NOT(A + B)
16. A metal cooking pan heats up quickly on a stove mainly due to
Answer: D. Conduction
17. Reversing the direction of the magnetic field while keeping the current constant will cause the force to
Answer: A. Reverse direction
18. If the charge passing through a wire in a given time is doubled, the current will
Answer: C. Be doubled
19. Which of the following expands the most when heated?
Answer: D. Gases
20. Which radiation can be stopped by a thin sheet of paper?
Answer: D. Alpha particles
21. Wave speed is given by the relation
Answer: B. v = f . λ
22. Which component of an electric motor reverses the direction of current?
Answer: D. Split-ring commutator
23. In which medium does sound travel the fastest?
Answer: D. Solids
Annual 2026, Set M (Paper code 2SA-I 26004 (M))
24. A diode is commonly used as a
Answer: C. Rectifier
25. If the angle of incidence is zero, the refracted ray will
Answer: A. Continue along the normal
26. An object becomes negatively charged when it
Answer: D. Gains electrons
27. If both inputs of a NAND gate are HIGH, the output will be
Answer: D. LOW
28. Which feature helps reduce heat loss in buildings?
Answer: C. Thermal insulation
29. The force on a current-carrying conductor in a magnetic field is maximum when the conductor is placed
Answer: D. Perpendicular to the field
30. The correct formula of electric current is
Answer: A. I = Q / t
31. The coefficient of volume expansion β equals
Answer: B. ΔV / (V₀ΔT)
32. Maximum displacement of particles refers to
Answer: B. Amplitude
33. The speed of a wave is 7 m/s. If its amplitude is doubled, the speed will
Answer: A. Not change
34. If the split-ring commutator is removed, the motor will
Answer: C. Stop after half rotation
35. Sound cannot travel through
Answer: A. Vacuum
Annual 2025
36. What is used to transmit light signals in modern communication?
Answer: A. Optical fibre
37. X + (17, 8)O → (14, 7)N + (4, 2)He ; X =
Answer: C. (1, 1)H
38. Which one of the following is necessary for simple harmonic motion?
Answer: A. Restoring force
39. What causes the difference in pitch between two sounds?
Answer: A. Their frequencies
40. According to the law of reflection, the angle of incidence is
Answer: A. Equal to angle of reflection
41. What happens when like charges are brought near each other?
Answer: D. They repel
42. According to Coulomb's law, F =
Answer: C. K q₁ q₂ / r²
43. In a conductor, keeping its resistance constant, if voltage is increased, the current will
Answer: D. Increase
44. Which factor increases the resistance of a conductor?
Answer: C. Increase in length
45. Why are household circuits connected in parallel?
Answer: A. So that each appliance gets full voltage
46. What principle is used in the working of a transformer?
Answer: A. Mutual induction
47. The cathode ray oscilloscope (CRO) measures
Answer: A. Electrical signals
Annual 2023
48. What is the principle behind carbon-dating?
Answer: A. After a plant or animal dies, it stops taking in fresh C-14
49. In an ocean, wind can produce waves of frequency 20 Hz. If 30 complete waves occupy a distance of 60 cm (λ = 2 cm), the velocity of the waves is
Answer: B. 40 cm/s
50. Speed of sound at 0 °C is 332 m/s. What is its speed in vacuum?
Answer: D. Zero
51. An incident ray of light makes an angle of 60° with a plane mirror. The angle of reflection of this ray is
Answer: A. 30°
52. If a charge of 3 C experiences a force of 15 N in the electric field of a 5 C charge, the electric field intensity at that point is
Answer: A. 5 N/C
53. Which of the following components obeys Ohm's law?
Answer: C. Fixed resistance (metallic wire)
54. If the length of a copper wire is 50 cm and its diameter is 2 mm, then the resistance of the wire is (ρ = 1.69×10-8 Ωm)
Answer: B. 2.7×10-3 Ω
55. Which device converts mechanical energy into electrical energy?
Answer: D. Generator
56. The direction of induced emf in a circuit is in accordance with conservation of
Answer: C. Energy
57. Which logic gate is similar to the function of two parallel switches?
Answer: B. OR
58. Information travels through wires in the telephone network of an office in the form of
Answer: A. Electrical signals
59. When radium-226 emits an α particle it turns into radon. If radium has 88 protons, the atomic number of radon is
Answer: C. 86