Fleming's left hand rule gives direction of MCQ with Answer and Explanation

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Fleming's left hand rule gives direction of

A. Induced emf

B. Magnetic field due to current

C. Induced current

D. Force on current-carrying conductor in magnetic field

Answer: Option D

Solution (By JKSSB Mock Tests)

Left hand rule for motor effect (force). Right hand for generator.

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Question #1

The color of sky is blue due to

A. Scattering

B. Dispersion

C. Refraction

D. Reflection

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Correct Answer: Option A

Explanation:
Rayleigh scattering of sunlight by air molecules, blue scattered most.

This question belongs to: Science Physics

Question #2

The part of the eye that controls the amount of light entering is

A. Iris

B. Lens

C. Cornea

D. Retina

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Correct Answer: Option A

Explanation:
Iris adjusts pupil size.

This question belongs to: Science Physics

Question #3

The working principle of a hydrogen bomb is

A. Nuclear fusion

B. Radioactive decay

C. Nuclear fission

D. Chemical reaction

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Correct Answer: Option A

Explanation:
Hydrogen bomb (thermonuclear weapon) uses uncontrolled nuclear fusion of hydrogen isotopes, triggered by a fission bomb. Releases enormous energy. Sun also uses fusion. Fission used in atomic bomb.

This question belongs to: Science Physics

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