set 7 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 : The velocity of sound is largest in

(a) metal

(b) water

(c) air

(d) vacuum

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

The human eye forms the image of an object at its

a) pupil

b) cornea

c) iris

d) retina

Answer: (d)

Question : 2

Transfer of heat by convection can take place in

a) Solids and vacuum

b) Gases and liquids

c) Solids and liquids

d) Vacuum and gases

Answer: (b)

Question : 3

Consider the following statements:

  1. The values of u and f for a concave lens are always negative by convention.
  2. The power of a convex lens is negative and that of a concave lens is positive.
  3. A concave lens always forms a virtual, erect and smaller image.
Which of these statements are correct?

a) 2 and 3

b) 1 and 2

c) 1 and 3

d) 1, 2 and 3

Answer: (c)

Power of lens is defined as P = 1 f

where f = focal length of the lens.

For, convex lens f = (+)ve concave lens f = (–)ve

Question : 4

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

a) Blue

b) Yellow

c) Red

d) Violet

Answer: (d)

Question : 5

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

a) Temperature

b) Pressure

c) Current

d) Heat Radiation

Answer: (a)

Question : 6

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

Answer: (a)

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