The device used to measure the emf of a cell without drawing current is MCQ with Answer and Explanation

Question

Share Report Error

The device used to measure the emf of a cell without drawing current is

A. Ammeter

B. Potentiometer

C. Galvanometer

D. Voltmeter

Answer: Option B

Solution (By JKSSB Mock Tests)

Potentiometer: null deflection method, no current drawn from cell.

This question belongs to: Science Physics

Request complete Subject PDF

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Physics Questions

Question #1

Mercury is used in thermometers because it

A. Has low boiling point

B. Wets glass

C. Is transparent

D. Has uniform expansion and is opaque

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option D

Explanation:
Mercury has uniform thermal expansion, visible, high boiling point (357°C). Does not wet glass.

This question belongs to: Science Physics

Question #2

A piece of copper wire has resistance 10 Ω at 0°C. α = 0.004/°C. At 100°C resistance is

A. 8 Ω

B. 14 Ω

C. 10 Ω

D. 12 Ω

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option B

Explanation:
R_t = R₀(1+α t) = 10(1+0.004×100) = 10(1.4) = 14 Ω.

This question belongs to: Science Physics

Question #3

A gap is left between railway tracks to allow for

A. Contraction in summer

B. Weight of train

C. Expansion in summer

D. Vibration

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
Thermal expansion. Rails expand in summer heat, gap prevents buckling. Linear expansion ΔL = α L ΔT.

This question belongs to: Science Physics

Explore All Physics MCQs