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 JKExamLibrary)

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

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

A bullet of mass 20 g fired from a gun of mass 5 kg with velocity 200 m/s. Recoil velocity of gun is

A. 0.8 m/s

B. 0.4 m/s

C. 2 m/s

D. 1 m/s

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Correct Answer: Option A

Explanation:
Conservation of momentum: 0 = (0.02×200) + (5×v) => v = -4/5 = -0.8 m/s (magnitude 0.8 m/s).

This question belongs to: Science Physics

Question #2 Report Error

The density of a substance is 8 g/cm³. In SI, it is

A. 8000 kg/m³

B. 800 kg/m³

C. 80 kg/m³

D. 8 kg/m³

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Correct Answer: Option A

Explanation:
1 g/cm³ = 1000 kg/m³, so 8 g/cm³ = 8000 kg/m³.

This question belongs to: Science Physics

Question #3 Report Error

Specific heat capacity of water is 4200 J/kg°C. How much heat is required to raise temperature of 2 kg water by 10°C?

A. 4200 J

B. 8400 J

C. 84000 J

D. 42000 J

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Correct Answer: Option C

Explanation:
Q = mcΔθ = 2 × 4200 × 10 = 84,000 J = 84 kJ. Large specific heat of water makes it useful for cooling and climate moderation. Always check units: mass kg, c J/kg°C, ΔT °C.

This question belongs to: Science Physics

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