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Science Quiz 21

author October 1, 2025 No Comments PYQ Quiz

Welcome to your Science Quiz 21

Diffusion of light in the atmosphere takes place due to: [2003]

Carbon dioxide

Helium

Water vapours

Not Attempted

None

Which one of the following statements is not correct? [2003]

The velocity of sound in air increases with the increase of temperature

The velocity of sound in air is independent of pressure

The velocity of sound in air decreases as the humidity increases

The velocity of sound in air is not affected by the change in amplitude and frequency

Not Attempted

None

Regarding the atom of a chemical element, the magnetic quantum number refers to: [2003]

orientation

shape

size

spin

Not Attempted

None

Assertion (A): The weight of a body decreases with the increase of latitude on earth: [2003] Reason (R): The earth is not perfect sphere

Choose the correct option.

Both A and R are individually true and R is the correct explanation of A

Both A and R are individually true but R is NOT the correct explanation of A

A is true but R is false

A is false but R is true

Not Attempted

None

Consider the following natural phenomena: [2002]

Terrestrial heating
Reflection of light
Refraction of light
Diffraction of light

Due to which of these phenomena is mirage formed?

1 and 2

2, 3 and 4

1 and 3

4 only

Not Attempted

None

Sun’s halo is produced by the refraction of light in: [2002]

Water vapour, in Stratus clouds

Ice crystals in Cirro-Cumulus clouds

Ice crystals in Cirrus clouds

Dust particles in Stratus clouds

Not Attempted

None

Consider the following statements: [2002]

Light of longer wavelength is scattered much more than the light of shorter wavelength.
The speed of visible light in water is 0.95 times and speed in vacuum.
Radio waves are produced by rapidly oscillating electrical currents.
To detect the over speeding vehicles, police use the Doppler effect of reflected short radio waves

Which of these statements are correct?

1 and 2

1 and 3

2 and 4

3 and 4

Not Attempted

None

Assertion (A): With the increase of temperature, the viscosity of glycerine increases: [2002] Reason (R): Rise of temperature increases kinetic energy of molecules.

Choose the correct option.

Both A and R are individually true and R is the correct explanation of A

Both A and R are individually true but R is not a correct explanation of A

A is true but R is false

A is false but R is true

Not Attempted

None

Assertion (A): An iron ball floats on mercury but gets immersed in water: [2002] Reason (R): The specific gravity of iron is more than that of mercury.

Choose the correct option.

Both A and R are individually true and R is the correct explanation of A

Both A and R are individually true but R is not a correct explanation of A

A is true but R is false

A is false but R is true

Not Attempted

None

10.

An oil tanker is partially filled with oil and moves forward on a level road with uniform acceleration. The free surface of oil then: [2003]

Remains horizontal

Is inclined to the horizontal with smaller depth at the rear end

Is inclined to the horizontal with larger depth at the rear end

Assumes parabolic curve

Not Attempted

None

Name

Time’s up

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