The process of a solid changing directly into gas is MCQ with Answer and Explanation

The process of a solid changing directly into gas is

A. Evaporation

B. Melting

C. Condensation

D. Sublimation

Answer: Option D

Solution (By JKExamLibrary)

Sublimation: solid → gas. Example: dry ice (CO₂), camphor. Deposition is reverse (gas → solid). Melting solid → liquid, evaporation liquid → gas.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

A person of mass 60 kg stands on a weighing scale in an elevator accelerating upward at 2 m/s² (g=10). The reading is

A. 48 kg

B. 120 kg

C. 72 kg

D. 60 kg

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Correct Answer: Option C

Explanation:
Apparent weight = m(g+a) = 60×(10+2) = 720 N, which corresponds to 72 kg mass on scale (if scale calibrated in kg under g=10). Reading 72 kg. Downward acceleration would reduce.

This question belongs to: Science Physics

Question #2 Report Error

The process of splitting a heavy nucleus into lighter nuclei is

A. Fusion

B. Transmutation

C. Radioactive decay

D. Fission

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Correct Answer: Option D

Explanation:
Fission, e.g., U-235 splitting.

This question belongs to: Science Physics

Question #3 Report Error

The process of emission of electrons from a metal surface by heating is

A. Photoelectric emission

B. Secondary emission

C. Thermionic emission

D. Field emission

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Correct Answer: Option C

Explanation:
Thermionic emission: heat supplies energy to overcome work function.

This question belongs to: Science Physics

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