light, heat, thermodynamics, wave motion, sound, optics & oscillations - Category wise Question and Answer Practice Test with Solutions

light, heat, thermodynamics, wave motion, sound, optics & oscillations PRACTICE TEST [16 - EXERCISES]

set 1

set 2

set 3

set 4

set 5

set 6

set 7

set 8

set 9

set 10

set 11

set 12

set 13

set 14

set 15

set 16

Question : 16

The reflection of sound is called echo. Which of the following conditions is/ are necessary for the formation of echo?

  1. The minimum distance between the source of sound and the reflecting body should be 17 m.
  2. The wavelength of sound should be less than the height of the reflecting body.

a) 1 and 2 both

b) 1 only

c) 2 only

d) None

Answer: (a)

The minimum distance between source and reflector of sound is given by,

ddim= $vt/2$

Question : 17 [UPPCS (Pre) 2015]

In driving a car which type of mirror would you like to use for observing traffic at your back?

a) Convex mirror

b) Spherical mirror

c) Concave mirror

d) Plain mirror

Answer: (a)

Question : 18 [IAS (Pre) 2003]

Opening the door of refrigerator kept in the room

a) You can cool the room to the temperature of refrigerator

b) You are warm the room a little

c) You can cool the room to some degree

d) You can neither cool nor warm the room

Answer: (b)

Question : 19

Consider the following statements:

  1. If magenta and yellow coloured circles intersect, the intersected area will have red colour.
  2. If cyan and magenta coloured circles intersect, the intersected area will have blue colour.
Which of the statements given above is/are correct?

a) 1 and 2 both

b) 1 only

c) 2 only

d) None

Answer: (a)

A combination of red and blue colours results in the formation of magenta colour.

Where a combination of red and green colour results in the formation of yellow colour.

Thus on a combination of magenta and yellow colour red colour will be highlighted.

On the other side combination of blue and green results in the formation of cyan colour.

A combination of red and blue colours produces a magenta colour.

Therefore, on a combination of cyan and magenta colours, the blue colour will be more highlighted.

Question : 20

Human ears can sense sound waves travelling in air having wavelength of

a) 1m

b) 10–3 m

c) 10–2 m

d) 102 m

Answer: (a)

IMPORTANT general science mcq EXERCISES

set 16 Online Quiz

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1654 heat wave motion sound optics oscillations based general science mcq set 16 question answer pdf
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