Which of the following has the least count of 0.001 cm? MCQ with Answer and Explanation

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Which of the following has the least count of 0.001 cm?

A. Screw gauge

B. Measuring tape

C. Vernier calliper

D. Metre scale

Answer: Option A

Solution (By JKSSB Mock Tests)

Screw gauge typically has least count 0.001 cm (0.01 mm). Vernier calliper least count 0.01 cm. Metre scale 0.1 cm. So screw gauge most precise.

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Question #1

Myopia is corrected by

A. Concave lens

B. Convex lens

C. Bifocal lens

D. Cylindrical lens

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Correct Answer: Option A

Explanation:
Myopia (nearsightedness) requires diverging lens (concave). Hypermetropia needs convex.

This question belongs to: Science Physics

Question #2

A 60 W bulb is used for 5 hours daily. How much electrical energy is consumed by the bulb in 30 days?

A. 0.9 kWh

B. 90 kWh

C. 900 kWh

D. 9 kWh

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Correct Answer: Option D

Explanation:
Electrical energy (E) = Power (P) × Time (t). Power = 60 W = 0.06 kW. Time per day = 5 hours. Total time in 30 days = 5 × 30 = 150 hours. Energy = 0.06 kW × 150 h = 9 kWh (or 9 units of electricity). One kWh is the commercial unit of energy.

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Question #3

The gravitational constant G was first measured by

A. Kepler

B. Newton

C. Galileo

D. Cavendish

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Correct Answer: Option D

Explanation:
Henry Cavendish used torsion balance to determine G.

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