A lactometer measures MCQ with Answer and Explanation

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A lactometer measures

A. Viscosity of milk

B. Temperature of milk

C. Density of milk

D. Purity of milk

Answer: Option D

Solution (By JKSSB Mock Tests)

Lactometer is a type of hydrometer used to check purity of milk by measuring specific gravity. Adulteration with water lowers density. It doesn't measure temperature or viscosity directly.

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Question #1

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The human eye lens is

A. Convex of fixed focal length

B. Plano-convex

C. Concave

D. Convex with variable focal length

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Correct Answer: Option D

Explanation:
Eye lens is convex, focal length changed by ciliary muscles (accommodation).

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Question #2

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A car accelerates from rest at 4 m/s² for 5 s, then moves at constant velocity for 5 s. Total distance is

A. 50 m

B. 150 m

C. 100 m

D. 200 m

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Correct Answer: Option B

Explanation:
Phase 1: s1 = ½×4×25 = 50 m, v=20 m/s. Phase 2: s2 = 20×5 = 100 m. Total 150 m.

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Question #3

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A wave in which particles vibrate perpendicular to direction of propagation is

A. Sound wave in air

B. Longitudinal

C. Both A and C

D. Transverse

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Correct Answer: Option D

Explanation:
Transverse: e.g., light, waves on string. Sound in air longitudinal.

This question belongs to: Science Physics

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