The specific heat capacity of water is high. This property is useful for: MCQ with Answer and Explanation

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The specific heat capacity of water is high. This property is useful for:

A. Thermal regulation in living organisms

B. Cooling systems in engines

C. Both (a) and (b)

D. Neither

Answer: Option C

Solution (By JKExamLibrary)

Water's high specific heat (4186 J/kg·K) means it absorbs/releases large heat with small temperature change. This stabilizes temperatures: in engines, water coolant absorbs heat without large ΔT; in organisms, it buffers against temperature fluctuations. Memory tip: 'High specific heat = thermal buffer; water moderates climate and body temperature'. This application question tests understanding of material properties, frequently appearing in competitive exams. Always link physical properties to real-world uses; competitive exams emphasize practical implications of physics concepts.

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Question #1

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An electron and a proton are accelerated through the exact same potential difference. Which particle will acquire a greater kinetic energy?

A. Both will acquire the exact same kinetic energy

B. The proton

C. The electron

D. Depends on their initial velocities

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Correct Answer: Option A

Explanation:
The work done by the electric field on a charged particle is completely converted into kinetic energy. Work = q * V, where q is the magnitude of the charge and V is the potential difference. Since both an electron and a proton have the exact same magnitude of charge (e = 1.6 x 10^-19 C), they acquire identical kinetic energy (eV).

This question belongs to: Science Physics

Question #2

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The gravitational constant G was first measured by

A. Newton

B. Galileo

C. Cavendish

D. Kepler

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Correct Answer: Option C

Explanation:
Henry Cavendish used torsion balance to determine G.

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Question #3

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A tuning fork A produces 5 beats/second with tuning fork B of frequency 256 Hz. If a little wax is applied to fork A, the beat frequency becomes 2 beats/second. The original frequency of fork A was:

A. 251 Hz

B. 258 Hz

C. 261 Hz

D. 254 Hz

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Correct Answer: Option C

Explanation:
The beat frequency is |fA - fB|. So fA is either 256+5=261 Hz or 256-5=251 Hz. Adding wax increases mass, which strictly decreases frequency. If fA was 261, decreasing it brings it closer to 256, reducing beats to 2 (e.g., 258-256=2). If it was 251, decreasing it would increase the beats (e.g., |248-256|=8). Thus, it was 261 Hz.

This question belongs to: Science Physics

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