Physics - General Knowledge Questions and Answers

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Through which light cannot pass?

Notebook paper

Water

Book

Sun glasses

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The speed of light in air is

3 × 10⁸ m/s

3 × 10^–8 m/s

8 × 10³ m/s

Infinity

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Eclipses occur due to which optical phenomena?

Reflection

Refraction

Rectilinear propagation

Diffraction

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When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is due to the phenomenon of :

Evaporation

Vaporisation

Diffusion

Sublimation

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Vegetables are cooked in lesser time by adding a pinch of salt while cooking because

Boiling point of water increases

Latent heat of vaporization of water decreases

Latent heat of vaporization of water increases

Boiling point of water decreases

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Which of the following is not an aerosol?

Mud

Dust

Smoke

Fog

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What is the process of conversion of solid state directly to gaseous state called?

Evaporation

Condensation

Sublimation

Distillation

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Solids have definite shapes.This is because

The forces of cohesion of the molecules within are very much less in them

The forces of cohesion are very large

The forces of adhesion are large

The forces of adhesion are less

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The amount of matter in a ball of steel is its :

Weight

Mass

Density

Volume