set 3 MCQ Questions & Answers Detailed Explanation

MOST IMPORTANT general science mcq - 16 EXERCISES

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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq

Questions : Ultrasonics are sound waves of frequency

(a) Less than 10,000 Hz

(b) Equal to 1000 Hz

(c) Greater than 20,000 Hz

(d) None of the above

The correct answers to the above question in:

Answer: (c)

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Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers

Question : 1

CT scan is done by using

a) Visible Light

b) Ultrasonic Waves

c) Infra-red Rays

d) X-Rays

Answer: (d)

Question : 2

The mirror, which is used in searchlights, is

a) Simple mirror

b) Convex mirror

c) Concave mirror

d) None of the above

Answer: (c)

Question : 3

If the length of second’s pendulum is increased by 2%, how many seconds will it lose per day?

a) 3456 s

b) 3600 s

c) 1728 s

d) 846 s

Answer: (d)

Question : 4

When a drop of oil is spread on a water surface, it displays beautiful colours in daylight because of

a) polarization of light

b) dispersion of light

c) reflection of light

d) interference of light

Answer: (d)

The colours are seen due to interference of light. The colours seen in reflected light are complementary with the colours seen in transmitted light.

Question : 5

Which of the following is not close to a black body?

a) Black holes

b) Black board paint

c) Green leaves

d) Red roses

Answer: (b)

Question : 6

It is more comfortable to wear white cloth in summer because

a) They radiate heat transferred from the body

b) They absorb perspiration

c) They reflect all the heat falling on them

d) They are soothing to the eye

Answer: (c)

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