The substance that sublimes is MCQ with Answer and Explanation

The substance that sublimes is

A. Naphthalene

B. Iron

C. Ice

D. Water

Answer: Option A

Solution (By JKExamLibrary)

Naphthalene (mothballs), camphor, dry ice sublime (solid → gas). Ice melts. Iron solid till melting. Water evaporates from liquid. Sublimation skips liquid phase.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

A body of volume 100 cc weighs 80 g in air. It will float in water with

A. 80 cc submerged

B. It will sink

C. 20 cc above water

D. 100 cc submerged

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Correct Answer: Option A

Explanation:
Density = 80/100 = 0.8 g/cc. Water density 1 g/cc. Fraction submerged = 0.8, so 80 cc submerged, 20 cc above. So option B correct.

This question belongs to: Science Physics

Question #2 Report Error

The nucleus of an atom contains

A. Electrons and neutrons

B. Electrons and protons

C. Only neutrons

D. Protons and neutrons

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Correct Answer: Option D

Explanation:
Protons (positive), neutrons (neutral). Electrons orbit outside. Hydrogen nucleus only proton. Heavy elements have more neutrons.

This question belongs to: Science Physics

Question #3 Report Error

Polarization proves light is:

A. Longitudinal wave

B. Matter wave

C. Mechanical wave

D. Transverse wave

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Correct Answer: Option D

Explanation:
Polarization possible only for transverse waves (oscillations ⊥ propagation). Longitudinal waves (sound) cannot be polarized. Memory aid: 'Polarization ⇒ transverse nature; light is EM transverse wave'. Wave property frequently tested in competitive exams.

This question belongs to: Science Physics

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