The least count of a vernier calliper is 0.01 cm. A reading of 2.50 cm has how many significant figures? MCQ with Answer and Explanation

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The least count of a vernier calliper is 0.01 cm. A reading of 2.50 cm has how many significant figures?

A. 4

B. 1

C. 2

D. 3

Answer: Option D

Solution (By JKSSB Mock Tests)

2.50 has three significant digits. Trailing zero after decimal significant because least count 0.01.

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Question #1

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Weight of an object on the Moon is about _____ of its weight on Earth.

A. 1/2

B. 1/4

C. 1/8

D. 1/6

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Correct Answer: Option D

Explanation:
Moon's gravity is about 1/6th of Earth's gravity. So weight (mg) is 1/6 of Earth weight. Mass remains same. g_moon ≈ 1.62 m/s², g_earth ≈ 9.8 m/s², ratio ≈ 1/6. Common fact in space science.

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Question #2

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A 6 V battery is connected to a 3 Ω resistor. Current is

A. 18 A

B. 3 A

C. 0.5 A

D. 2 A

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Correct Answer: Option D

Explanation:
I = V/R = 6/3 = 2 A.

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Question #3

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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 × 10⁻³ /°C

B. 1.9 × 10⁻⁵ /°C

C. 1.9 × 10⁻⁶ /°C

D. 1.9 × 10⁻⁴ /°C

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Correct Answer: Option B

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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