The purpose of choke in a fluorescent lamp is to MCQ with Answer and Explanation

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The purpose of choke in a fluorescent lamp is to

A. Limit current and provide high voltage at start

B. Convert AC to DC

C. Produce heat

D. Store energy

Answer: Option A

Solution (By JKSSB Mock Tests)

Choke (inductor) limits current during running and provides high voltage surge to start the lamp.

This question belongs to: Science Physics

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Question #1

Escape velocity depends on:

A. Projectile mass

B. Launch angle

C. Planet mass and radius

D. Atmosphere

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Correct Answer: Option C

Explanation:
v_e = √(2GM/R): depends on planet's M and R, independent of projectile mass or launch direction. Memory tip: 'v_e ∝ √(M/R); property of planet, not projectile'. Gravitation concept frequently tested in competitive exams.

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Question #2

In a step-up transformer, the primary coil has

A. Fewer turns and thicker wire

B. More turns and thicker wire

C. More turns and thinner wire

D. Fewer turns and thinner wire

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Correct Answer: Option A

Explanation:
Step-up: Ns > Np. Primary fewer turns, thicker wire because current higher on primary side (for step-up, Vp < Vs, Ip > Is).

This question belongs to: Science Physics

Question #3

Which of the following is not an electromagnetic wave?

A. Sound waves

B. Gamma rays

C. Ultraviolet

D. X-rays

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Correct Answer: Option A

Explanation:
Sound waves are mechanical, require medium.

This question belongs to: Science Physics

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