A body at 100°C is placed in contact with a body at 0°C. Heat flow stops when MCQ with Answer and Explanation

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A body at 100°C is placed in contact with a body at 0°C. Heat flow stops when

A. Thermal equilibrium is reached

B. Heat content becomes equal

C. Both reach 100°C

D. Both reach 0°C

Answer: Option A

Solution (By JKSSB Mock Tests)

Heat flows until temperatures equal, i.e., thermal equilibrium. Not necessarily 50°C unless heat capacities equal.

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Question #1

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A projectile is fired with velocity u at angle 45° with horizontal. Its time of flight is (g = 10 m/s²)

A. √2 u/10

B. √2 u/5

C. u/5√2

D. u/5

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Correct Answer: Option A

Explanation:
T = 2u sinθ/g = 2u sin45°/10 = 2u(1/√2)/10 = √2 u/10. SSC often tests projectile basics.

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Question #2

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The dimensional formula of strain is

A. [T⁻¹]

B. [MLT⁻²]

C. [L]

D. [M⁰L⁰T⁰]

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Correct Answer: Option D

Explanation:
Strain = ΔL/L, dimensionless, so [M⁰L⁰T⁰].

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Question #3

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A 100 W bulb is used for 10 hours. Energy consumed is

A. 0.1 kWh

B. 10 kWh

C. 1 kWh

D. 100 kWh

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Correct Answer: Option C

Explanation:
Energy = 0.1 kW × 10 h = 1 kWh.

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