Water's high specific heat useful for: MCQ with Answer and Explanation

Water's high specific heat useful for:
A. Engine cooling
B. Both
C. Neither
D. Biological temperature regulation
Answer: Option B
Solution (By JKSSB Mock Tests)
High c = absorbs/releases large heat with small ΔT. Stabilizes engine temperatures and organism body temperatures. Memory tip: 'High specific heat = thermal buffer; water moderates climate and physiology'. Property application frequently tested in competitive exams.

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The device used to measure the speed of a vehicle is
A. Barometer
B. Anemometer
C. Speedometer
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Correct Answer: Option C


Explanation:
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This question belongs to: Science Physics
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Lens power P = -4 D. Focal length and type:
A. 40 cm, concave
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Correct Answer: Option C


Explanation:
P = 1/f(m) ⇒ f = 1/P = 1/(-4) = -0.25 m = -25 cm. Negative focal length indicates diverging (concave) lens. Memory aid: 'Negative power = concave lens; f(cm) = 100/P(D)'. Direct lens power application frequently tested in competitive exams with sign convention awareness.

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Question #3
Significant figures in 0.004050:
A. 3
B. 4
C. 7
D. 5

Correct Answer: Option B


Explanation:
Rules: leading zeros not significant; trailing zero after decimal is significant. Digits 4,0,5,0 are significant ⇒ 4 sig figs. Memory tip: 'Start at first non-zero; include trailing zeros after decimal'. Measurement precision concept frequently tested in competitive exams.

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