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Light and sound Categories

Multiple Choice Questions GK on Light and sound

Question 1 : Why do some automobiles have additional yellow headlights?

A. both (a) and (b)

B. Yellow light is able to penetrate the fog and is thus able to illuminate the road better in fogy nights

C. Yellow light consumes less power

D. Yellow light does not produce dazzling effect in the eyes of the people coming from front

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Question 2 : Which one among the following is not produced by sound waves in air?

A. Refraction

B. Reflection

C. Diffraction

D. Polarization

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Question 3 : Which of the following types of light are strongly absorbed by plants?

A. Yellow and violet

B. Indigo and yellow

C. Blue and red

D. Violet and orange

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Question 4 : Which of the following is a wrong statement?

A. rainbow is formed due to refraction of light in rain drops

B. the same rainbow can be observed by two persons if both have normal vision

C. sometimes two rainbows can be seen simultaneously

D. a rainbow can be seen only when the sun is at your front

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Question 5 : Which of the following is a wrong statement?

A. Light is a wave motion

B. Light travels in a straight line

C. Light cannot travel through vaccum

D. Light travels with a speed greater than that of sound

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Question 6 : Which components of light are absorbed by chlorophyll?

A. Violet and yellow

B. Blue and red

C. Indigo and orange

D. Violet and red

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Question 7 : Which colour is the complementary colour of yellow?

A. Red

B. Orange

C. Green

D. Blue

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Question 8 : When sound wave is refracted from air to water, then which of the following will remain unchanged?

A. None of the above

B. Velocity

C. Wavelength

D. Frequency

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Question 9 : When a ray of light is going from one medium to another, its

A. wavelength increases

B. frequency increases

C. frequency remains same

D. wavelength remains same

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Question 10 : Ultrasonic waves are those sound waves having frequency

A. less than 20 hertz

B. more than 20 kilohertz

C. between 1000 hertz and 20000 hertz

D. between 20 hertz and 1000 hertz

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Question 11 : The visible light has a wavelength range from about 380 nm (violet) to 780 nm (red). If an excited object emits light with wavelength of 15 nm, to which one of the following ranges does it belong?

A. Ultraviolet

B. Infrared

C. Gamma ray

D. X-ray

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Question 12 : The separation of white light into its component colours is called :

A. Radiation

B. Reflection

C. Refraction

D. Dispersion

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Question 13 : The audible frequency range of a human ear is

A. 20 hertz to 20000 hertz

B. 200 hertz to 2000 hertz

C. 2 hertz to 20 hertz

D. 20 hertz to 200 hertz

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Question 14 : Sound moves with higher velocity if:

A. both B and C above

B. humidity of the medium is increased

C. temperature of the medium is increased

D. pressure of the of medium is decreased

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Question 15 : Propagation of light quanta may be described by

A. Electrons

B. Neutrons

C. Protons

D. Photons

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