The substance that sublimes is MCQ with Answer and Explanation

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The substance that sublimes is

A. Iron

B. Ice

C. Naphthalene

D. Water

Answer: Option C

Solution (By JKSSB Mock Tests)

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

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Question #1

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Ohm's law is valid for

A. Electrolytes

B. All conductors

C. Metallic conductors at constant temperature

D. Semiconductors only

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Correct Answer: Option C

Explanation:
Ohm's law V = IR holds for ohmic conductors (metals) provided temperature and physical conditions constant. Non-ohmic: semiconductors, diodes, electrolytes. Graph V-I is straight line for ohmic. Temperature changes resistance, so condition necessary.

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Question #2

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A ball is thrown upward with velocity 30 m/s. Time to reach maximum height (g=10) is

A. 2 s

B. 6 s

C. 3 s

D. 1.5 s

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Correct Answer: Option C

Explanation:
v = u - gt, at top v=0 => t = u/g = 30/10 = 3 s.

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Question #3

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A ship floats because its density is

A. Zero

B. Less than water on average

C. Equal to water

D. Greater than water

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Correct Answer: Option B

Explanation:
Ship is made of steel (density > water) but hollow shape makes average density (including air) less than water. Displaced water weight equals ship's weight, buoyancy holds it up.

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