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. Sublimation
B. Evaporation
C. Condensation
D. Melting
Answer: Option A
Solution (By JKSSB Mock Tests)
Sublimation: solid → gas. Example: dry ice (CO₂), camphor. Deposition is reverse (gas → solid). Melting solid → liquid, evaporation liquid → gas.

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Practice More Physics Questions

Question #1
The First Law of Thermodynamics is essentially a specific application of which fundamental principle of physics?
A. Conservation of Mass
B. Conservation of Momentum
C. Conservation of Energy
D. Newton's Third Law

Correct Answer: Option C


Explanation:
The first law of thermodynamics states that the heat supplied to a system (dQ) is equal to the change in its internal energy (dU) plus the work done by the system (dW): dQ = dU + dW. This is the law of conservation of energy applied to thermodynamic systems, stating that energy cannot be created or destroyed, only transferred or changed in form.

This question belongs to: Science Physics
Question #2
A machine does 1000 J of work in 20 s. Power is
A. 20000 W
B. 20 W
C. 5 W
D. 50 W

Correct Answer: Option D


Explanation:
P = 1000/20 = 50 W.

This question belongs to: Science Physics
Question #3
The characteristic of sound that distinguishes between two sounds of same pitch and loudness is
A. Wavelength
B. Quality
C. Intensity
D. Frequency

Correct Answer: Option B


Explanation:
Timbre or quality depends on waveform/harmonics. Different instruments same note sound different.

This question belongs to: Science Physics