set 15 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 : What is the use of thermostat?

(a) To increase the temperature

(b) To maintain the temperature

(c) To measure the temperature

(d) To convert heat into electricity

The correct answers to the above question in:

Answer: (b)

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

Question : 1

The standing wave pattern along a string of length 60 cm is shown in the above diagram. If the speed of the transverse waves on this string is 300 m/s, in which one of the following modes is the string vibrating ?

sound oscillations heat thermodynamics question answer 24

a) First overtone

b) Fundamental

c) Second overtone

d) Third overtone

Answer: (c)

Question : 2

A metal sheet with a circular hole is heated. The hole

a) remains of the same size

b) gets larger

c) gets smaller

d) gets deformed

Answer: (b)

Question : 3

The Doppler’s effect is applicable for

a) Sound waves

b) Space waves

c) Light waves

d) Both (a) and (c)

Answer: (d)

Question : 4

Long radio waves are reflected by which of the following layer of Earth’s surface?

a) Tropopause

b) Ionosphere

c) Troposphere

d) Stratosphere

Answer: (b)

Question : 5

A well cut diamond appears bright because

a) of the total internal reflection

b) of reflection of light

c) of dispersion of light

d) of refraction of light

Answer: (a)

Question : 6

Which one of the colours has the longest wavelength?

a) Blue

b) Yellow

c) Green

d) Red

Answer: (d)

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