A gap is left between railway tracks to allow for MCQ with Answer and Explanation

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A gap is left between railway tracks to allow for

A. Weight of train

B. Expansion in summer

C. Contraction in summer

D. Vibration

Answer: Option B

Solution (By JKSSB Mock Tests)

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

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Practice More Physics Questions

Question #1

A hydraulic lift has area ratio of output to input piston 10:1. Force applied 50 N on input piston lifts weight of

A. 500 N

B. 50 N

C. 5 N

D. 5000 N

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Correct Answer: Option A

Explanation:
F1/A1 = F2/A2 => F2 = (A2/A1) F1 = 10×50 = 500 N.

This question belongs to: Science Physics

Question #2

Which of the following colours has the longest wavelength?

A. Green

B. Violet

C. Red

D. Blue

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Correct Answer: Option C

Explanation:
Visible spectrum: red ~700 nm, orange, yellow, green, blue, indigo, violet ~400 nm. Red has longest wavelength, lowest frequency. Violet shortest wavelength, highest frequency. Remember VIBGYOR.

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Question #3

Electric field due to point charge: E ∝

A. r

B. 1/r²

C. 1/r

D. r²

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Correct Answer: Option B

Explanation:
Coulomb's law: E = kq/r² ⇒ E ∝ 1/r². Inverse square law fundamental to electrostatics and gravitation. Memory tip: 'Point charge field: inverse square; double distance ⇒ field becomes 1/4'. Electrostatics concept frequently tested in competitive exams.

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