Maths MCQs for AD (ASF)
Q11. Power factor in AC circuit equals:
- A) sinφ
- B) tanφ
- C) cosφ
- D) secφ
Answer: C
Power factor = cosφ (phase difference between voltage & current).
Q12. Magnetic field inside a long solenoid depends mainly on:
- A) Length only
- B) Wire thickness
- C) Core diameter
- D) Current and turns density
Answer: D
B = μ₀nI → depends on current & turns per unit length.
Q13. Photon energy increases when wavelength:
- A) Increases
- B) Decreases
- C) Remains constant
- D) Doubles
Answer: B
E = hc/λ → shorter wavelength means higher energy.
Q14. Work done by conservative forces depends on:
- A) Initial and final positions
- B) Speed only
- C) Path only
- D) Time taken
Answer: A
Independent of path; depends only on positions.
Q15. Critical angle exists when light travels from:
- A) Rare → Dense
- B) Dense → Rare
- C) Vacuum → Air
- D) Equal refractive indices
Answer: B
Total internal reflection occurs from dense to rare medium.
Q16. In a p-type semiconductor, majority carriers are:
- A) Electrons
- B) Neutrons
- C) Protons
- D) Holes
Answer: D
Holes are the majority carriers in p-type materials.
Q17. The slope of velocity-time graph represents:
- A) Displacement
- B) Acceleration
- C) Momentum
- D) Force
Answer: B
Slope = change in velocity / time = acceleration.
Q18. If frequency increases, inductive reactance:
- A) Decreases
- B) Zero
- C) Constant
- D) Increases
Answer: D
XL = 2πfL → directly proportional to frequency.
Q19. Which law explains buoyant force?
- A) Archimedes’ principle
- B) Pascal’s law
- C) Newton’s third law
- D) Bernoulli’s theorem
Answer: A
Buoyant force equals weight of displaced fluid.
Q20. Coherent light sources must have same:
- A) Amplitude only
- B) Polarization only
- C) Intensity only
- D) Constant phase difference
Answer: D
Constant phase difference ensures stable interference.
Maths MCQs
