set 8 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 : 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

The correct answers to the above question in:

Answer: (b)

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Question : 1

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 : 2

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 : 3

A solid is melted (above the melting point) and allowed to cool down at normal condition.Its variation of temperature as a function of times is as shown in the figure given below. What is the reason for the plateau(flat position) in the central region of the cooling curve as shown in the figure?

a) Specific heat of the solid

b) Latent heat of fusion of the solid

c) Thermal conductivity of the solid

d) Thermal capacity of the solid.

Answer: (b)

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