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 : 21

A person cannot see objects clearly which are nearer than 75 cm from his eyes, the disease he is suffering from is

a) hypermetropia

b) astigmatism

c) myopia

d) presbyopia

Answer: (a)

Question : 22

A star is emitting yellow light. If it is accelerated towards earth then to an observer on earth, it will appear

a) gradually changing to red

b) shinning yellow

c) gradually changing to violet

d) unchanged

Answer: (c)

As the star is accelerated towards earth, its apparent frequency increases, and apparent wavelength decreases.

Therefore, the colour of the light changes gradually to violet.

Question : 23 [UP UDA/LDA (Pre) 2001]

Assertion (A):
Black hole is such a celestial existence which cannot be seen by telescope.
Reason (R):
The gravitational field of black hole is much strong that even light does not escape from it.
Code

a) Both (A) and (R) are true, but (R) is not the correct explanation of (A)

b) (A) is true, but (R) is false

c) Both (A) and (R) are true and (R) is the correct explanation of (A)

d) (A) is false, but (R) is true

Answer: (c)

Question : 24

When water is heated from 0ºC to 10ºC, its volume

a) does not change

b) increases

c) decreases

d) first decreases and then increases

Answer: (d)

Question : 25

When a sound wave goes from one medium to another, the quantity that remains unchanged is

a) wavelength

b) frequency

c) amplitude

d) speed

Answer: (b)

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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