Series & Parallel Resistors — Homi Bhabha Exam Physics MCQs with Solutions
Free Homi Bhabha Exam Physics Series & Parallel Resistors 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 — Series & Parallel Resistors · medium · numerical
Three resistors of 2 Ω, 3 Ω and 5 Ω are joined in series. Their combined resistance is:
A. 10 Ω ✓ Correct
B. 1 Ω
C. 0.97 Ω
D. 30 Ω
Solution: In series, resistances add: $2 + 3 + 5 = 10$ Ω.
Q2 — Series & Parallel Resistors · hard · numerical
Two 6 Ω resistors are connected in parallel. Their equivalent resistance is:
A. 6 Ω
B. 12 Ω
C. 36 Ω
D. 3 Ω ✓ Correct
Solution: For two equal parallel resistors, $R = \dfrac{6}{2} = 3$ Ω.
Q3 — Series & Parallel Resistors · hard · numerical
A 2 Ω and a 3 Ω resistor are connected in parallel. The equivalent resistance is:
A. 1.2 Ω ✓ Correct
B. 2.5 Ω
C. 5 Ω
D. 6 Ω
Solution: $\dfrac{1}{R} = \dfrac{1}{2} + \dfrac{1}{3} = \dfrac{5}{6} \Rightarrow R = \dfrac{6}{5} = 1.2$ Ω.
Q4 — Series & Parallel Resistors · medium · theory
In a series circuit, the quantity that is the same through every component is the:
A. potential difference
B. resistance
C. current ✓ Correct
D. power
Solution: In series the same current flows through all components, while the voltage divides among them.
Q5 — Series & Parallel Resistors · hard · numerical
Three 2 Ω resistors are connected in series across a 12 V battery. The current in the circuit is:
A. 18 A
B. 6 A
C. 2 A ✓ Correct
D. 0.5 A
Solution: Total resistance $= 2 + 2 + 2 = 6$ Ω; current $= \dfrac{12}{6} = 2$ A.