The process of heat transfer without any medium is MCQ with Answer and Explanation

Question Report Error

The process of heat transfer without any medium is

A. Evaporation

B. Conduction

C. Convection

D. Radiation

Answer: Option D

Solution (By JKExamLibrary)

Radiation by electromagnetic waves can travel through vacuum.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

The nucleus of an atom consists of

A. Electrons and neutrons

B. Protons and neutrons

C. Electrons and protons

D. Only protons

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Correct Answer: Option B

Explanation:
Nucleus contains protons (positive) and neutrons (neutral), collectively nucleons. Electrons orbit nucleus. Atomic number Z = protons, mass number A = protons + neutrons. Isotopes differ in neutron number.

This question belongs to: Science Physics

Question #2 Report Error

Atmospheric pressure at sea level is about

A. 10⁵ Pa

B. 10⁹ Pa

C. 10⁷ Pa

D. 10³ Pa

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Correct Answer: Option A

Explanation:
1 atm = 1.013×10⁵ Pa. Standard approximation.

This question belongs to: Science Physics

Question #3 Report Error

A convex lens is placed in water. Its focal length

A. Remains same

B. Increases

C. Becomes zero

D. Decreases

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Correct Answer: Option B

Explanation:
Refractive index relative to water decreases, so power decreases, focal length increases.

This question belongs to: Science Physics

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