MCQ Collection
Pakistan MCQs
Practice Pakistan questions with answers and explanations.
Choose an option to check your answer.
Correct Answer: A. 0.054 N
Explanation:
Use F=kq1q2/r² with charges in coulombs.
F=9×10^9×2×10^-6×3×10^-6 = 0.054 N.
Choose an option to check your answer.
Correct Answer: B. It becomes one-ninth
Explanation:
Coulomb force varies inversely with distance squared.
Tripling distance multiplies force by 1/3² = 1/9.
Choose an option to check your answer.
Correct Answer: C. 5 N/C
Explanation:
Electric field is force per unit charge.
E=20/4 = 5 N/C.
Choose an option to check your answer.
Correct Answer: D. 24 J
Explanation:
Electrical work is W=QV.
W=2×12 = 24 J.
Choose an option to check your answer.
Correct Answer: A. 60 C
Explanation:
Charge is Q=It.
Q=3×20 = 60 C.
Choose an option to check your answer.
Correct Answer: B. 4 A
Explanation:
Current is charge divided by time.
I=120/30 = 4 A.
Choose an option to check your answer.
Correct Answer: C. 3 A
Explanation:
Ohm's law gives I=V/R.
I=12/4 = 3 A.
Choose an option to check your answer.
Correct Answer: D. 30 V
Explanation:
Use V=IR.
V=2×15 = 30 V.
Choose an option to check your answer.
Correct Answer: A. -10 cm
Explanation:
Image height equals magnification times object height.
Hi=-2×5=-10 cm, indicating inversion.
Choose an option to check your answer.
Correct Answer: A. Charge stored per unit potential difference
Explanation:
Capacitance is C=Q/V.
Its SI unit is the farad.
Choose an option to check your answer.
Correct Answer: B. Reciprocal of focal length in metres
Explanation:
Lens power is measured in dioptres.
Converging lenses have positive power and diverging lenses negative power.
Choose an option to check your answer.
Correct Answer: B. 24 cm
Explanation:
For a spherical mirror, R=2f.
R=2×12 = 24 cm.
