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 human eye forms the image of an object at its

(a) pupil

(b) cornea

(c) iris

(d) retina

The correct answers to the above question in:

Answer: (d)

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

Question : 1

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 : 2

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 : 3

Ventilators are provided at the top of room

a) to maintain conventional currents to keep the air fresh in the room

b) to bring oxygen for breathing

c) so that sunlight may enter the room

d) to provide an outlet for carbon dioxide

Answer: (a)

Question : 4

The velocity of sound is largest in

a) metal

b) water

c) air

d) vacuum

Answer: (a)

Question : 5

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

a) Blue

b) Yellow

c) Red

d) Violet

Answer: (d)

Question : 6

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

a) Temperature

b) Pressure

c) Current

d) Heat Radiation

Answer: (a)

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