Electric Charge & Potential Difference — Homi Bhabha Exam Physics MCQs with Solutions
Free Homi Bhabha Exam Physics Electric Charge & Potential Difference MCQs with step-by-step solutions (5 questions). Part of Electricity & Magnetism. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Electric Charge & Potential Difference · medium · theory
The SI unit of electric charge is the:
A. volt
B. ampere
C. ohm
D. coulomb ✓ Correct
Solution: Charge is measured in coulombs (C); 1 C = 1 ampere × 1 second.
Q2 — Electric Charge & Potential Difference · medium · numerical
If a current of 2 A flows through a wire for 5 s, the charge that passes through it is:
A. 10 C ✓ Correct
B. 2.5 C
C. 0.4 C
D. 7 C
Solution: Charge $Q = I \times t = 2 \times 5 = 10$ C.
Q3 — Electric Charge & Potential Difference · medium · theory
The potential difference between two points is defined as the work done in moving a unit charge between them, and its SI unit is the:
A. coulomb
B. watt
C. ampere
D. volt ✓ Correct
Solution: Potential difference $V = \dfrac{W}{Q}$; its unit is the volt (1 V = 1 J/C).
Q4 — Electric Charge & Potential Difference · hard · numerical
If 20 J of work is done in moving 4 C of charge between two points, the potential difference between them is:
A. 80 V
B. 5 V ✓ Correct
C. 24 V
D. 0.2 V
Solution: $V = \dfrac{W}{Q} = \dfrac{20}{4} = 5$ V.
Q5 — Electric Charge & Potential Difference · medium · theory
A material through which electric charge flows easily is called a:
A. insulator
B. conductor ✓ Correct
C. dielectric
D. semiconductor only
Solution: Conductors (e.g. metals) allow charge to flow; insulators (e.g. rubber) resist it.