set 7 MCQ Questions & Answers Detailed Explanation

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

Questions : If the door of a running refrigerator in a closed room is kept open, what will be the net effect on the room?

(a) It will heat the room

(b) It will cool the room

(c) It will make no difference on the average

(d) It will make the temperature go up and down

The correct answers to the above question in:

Answer: (a)

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

Question : 1

Thermostat ...... is a mean of Keeping Stable.

a) Temperature

b) Pressure

c) Current

d) Heat Radiation

Answer: (a)

Question : 2

In the visible spectrum, the colour having the shortest wavelength is

a) Blue

b) Yellow

c) Red

d) Violet

Answer: (d)

Question : 3

The velocity of sound is largest in

a) metal

b) water

c) air

d) vacuum

Answer: (a)

Question : 4

In order that the heat flows from one part of a solid to another part, what is required?

a) Density gradient

b) Uniform density

c) Temperature gradient

d) Uniform temperature

Answer: (c)

As heat flows from higher temperature to lower temperature, so a temperature gradient is required.

Question : 5

Strips of two metals A and B are firmly joined together as shown in the figure. On heating, A expands more than B does. If this jointed strip is heated, then it will appear as 

sound oscillations heat thermodynamics question answer 40

a) Figure a

sound oscillations heat thermodynamics question answer 40 option b

b) Figure b

sound oscillations heat thermodynamics question answer 40 option a

c) Figure c

sound oscillations heat thermodynamics question answer 40 option c

d) Figure d

sound oscillations heat thermodynamics question answer 40 option d

Answer: (a)

Question : 6

Red light signal is used as a danger signal because

a) It produces least chemical reaction

b) This is comfortable for eyes

c) Red light is scattered least

d) It is least absorbed in air

Answer: (c)

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