Which of the following is not a transverse wave? MCQ with Answer and Explanation

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Which of the following is not a transverse wave?

A. Wave on a string

B. Sound wave in air

C. Radio wave

D. Light wave

Answer: Option B

Solution (By JKSSB Mock Tests)

Sound in air is longitudinal. Light, radio are EM waves, transverse. Wave on string transverse. Water waves combine transverse and longitudinal.

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Question #1

Alpha particle is:

A. Neutron

B. Photon

C. Electron

D. Helium nucleus

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Correct Answer: Option D

Explanation:
Alpha (α) radiation: helium nucleus (²He⁴, 2p+2n), +2 charge, low penetration. Beta: electrons; Gamma: photons; Neutron: neutral particle. Memory aid: 'Alpha = He nucleus; Beta = electron; Gamma = EM wave'. Radioactivity classification frequently tested in competitive exams to distinguish radiation types.

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Question #2

Carnot efficiency η = 1 - T₂/T₁. If T₁=600K, T₂=300K, η is:

A. 75%

B. 100%

C. 50%

D. 25%

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Correct Answer: Option C

Explanation:
η = 1 - 300/600 = 1 - 0.5 = 0.5 = 50%. Maximum possible efficiency for given temperatures. Memory aid: 'η_Carnot = 1 - T_cold/T_hot; always < 100%'. Thermodynamics calculation frequently tested in competitive exams.

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Question #3

Latent heat of fusion ice = 336 kJ/kg. Heat to melt 3 kg ice at 0°C:

A. 112 kJ

B. 1008 kJ

C. 336 kJ

D. 672 kJ

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Correct Answer: Option B

Explanation:
Q = mL = 3×336 = 1008 kJ. Direct latent heat formula application. Memory tip: 'Phase change: Q = mL; no temperature change'. Calorimetry calculation frequently tested in competitive exams.

This question belongs to: Science Physics

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