The direction of magnetic field around a straight current-carrying wire is given by MCQ with Answer and Explanation

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The direction of magnetic field around a straight current-carrying wire is given by

A. Right hand thumb rule

B. Ohm's law

C. Fleming's left hand rule

D. Fleming's right hand rule

Answer: Option A

Solution (By JKSSB Mock Tests)

Right hand thumb rule: thumb current, fingers curl gives field direction.

This question belongs to: Science Physics

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Question #1

A 50 kg person climbs 30 steps each 15 cm high in 10 s. Power (g=10) is

A. 225 W

B. 300 W

C. 150 W

D. 2250 W

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Correct Answer: Option A

Explanation:
Height = 30×0.15=4.5 m. Work = 50×10×4.5=2250 J. Power=2250/10=225 W.

This question belongs to: Science Physics

Question #2

The instrument that measures atmospheric pressure is

A. Hydrometer

B. Manometer

C. Lactometer

D. Barometer

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Correct Answer: Option D

Explanation:
Barometer measures atmospheric pressure. Mercury barometer (Torricelli) standard. Aneroid barometer. Manometer measures pressure difference. Hydrometer density. Lactometer milk purity.

This question belongs to: Science Physics

Question #3

A wire of resistance 10 Ω is stretched to double its length. Its new resistance is

A. 20 Ω

B. 40 Ω

C. 10 Ω

D. 5 Ω

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Correct Answer: Option B

Explanation:
Resistance R = ρL/A. Volume constant: A ∝ 1/L. Stretching length to 2L reduces area to A/2. New R' = ρ(2L)/(A/2) = 4ρL/A = 4R = 40 Ω. Resistance proportional to (length)² when volume constant.

This question belongs to: Science Physics

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