A car moving with speed 54 km/h is stopped in 5 s. The distance covered before stop is MCQ with Answer and Explanation

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A car moving with speed 54 km/h is stopped in 5 s. The distance covered before stop is

A. 54 m

B. 27 m

C. 75 m

D. 37.5 m

Answer: Option D

Solution (By JKSSB Mock Tests)

54 km/h = 15 m/s. u=15, v=0, t=5. a = (0-15)/5 = -3 m/s². s = ut+½at² = 15×5 + ½×(-3)×25 = 75 - 37.5 = 37.5 m. Or s = (u+v)/2 × t = 7.5×5 = 37.5 m.

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Question #1

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The least count of a vernier calliper is 0.01 cm. A measurement should be recorded as

A. 2.50 cm

B. 2.5000 cm

C. 2.500 cm

D. 2.5 cm

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Correct Answer: Option A

Explanation:
Least count determines precision: two decimal places. So 2.50 cm. Extra digits indicate false precision.

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Question #2

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In geometric optics, the power of a lens is defined as the reciprocal of its:

A. Radius of curvature

B. Focal length in meters

C. Refractive index

D. Magnification

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Correct Answer: Option B

Explanation:
The power (P) of a lens indicates its converging or diverging ability. It is mathematically defined as the reciprocal of the focal length (f), provided the focal length is measured in meters. The formula is P = 1 / f(in meters). The SI unit of power for a lens is the Diopter (D). A focal length of 0.5m gives a power of 2D.

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