The unit of impulse is MCQ with Answer and Explanation

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The unit of impulse is

A. N s

B. J s

C. N m

D. N/m

Answer: Option A

Solution (By JKSSB Mock Tests)

Impulse = F×Δt, unit N s, same as momentum kg m/s.

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Question #1

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A brass rod of length 1 m at 0°C expands by 0.0019 m when heated to 100°C. Its linear expansion coefficient is

A. 1.9 × 10⁻⁵ /°C

B. 1.9 × 10⁻⁴ /°C

C. 1.9 × 10⁻⁶ /°C

D. 1.9 × 10⁻³ /°C

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Correct Answer: Option A

Explanation:
ΔL = α L₀ ΔT => α = ΔL/(L₀ ΔT) = 0.0019/(1×100) = 1.9×10⁻⁵ /°C. Typical for brass. Unit is per °C. Always check ΔL/L per °C.

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Question #2

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The energy equivalent of 1 g mass is

A. 9×10¹⁶ J

B. 9×10¹⁰ J

C. 9×10¹³ J

D. 3×10⁸ J

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Correct Answer: Option C

Explanation:
E = mc² = 0.001 kg × (3×10⁸)² = 0.001 × 9×10¹⁶ = 9×10¹³ J. Enormous energy. 1 g mass if fully converted gives this. Atomic bomb converts small fraction.

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Question #3

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A body of mass m is taken from Earth's surface to a height equal to twice Earth's radius. Change in potential energy is

A. 3mgR

B. mgR/3

C. mgR

D. 2mgR/3

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Correct Answer: Option D

Explanation:
ΔU = GMm (1/R - 1/(R+2R)) = GMm (1/R - 1/3R) = (2/3)GMm/R = (2/3)mgR.

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