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 : 6 [CDS]

Mr X was advised by an architect to make outer walls of his house with hollow bricks. The correct reason is that such walls

a) help keeping inside cooler in summer and warmer in winter

b) make the building stronger

c) prevent seepage of moisture from outside

d) protect the building from lightning

Answer: (a)

Question : 7 [IAS (Pre) 1995]

When the same note is played on a sitar and a flute, the sound produced can be distinguished from each other because of the difference in

a) pitch and loudness

b) quality only

c) pitch, loudness and quality

d) loudness only

Answer: (b)

Question : 8 [CDS]

Assertion (A):
In a pressure cooker food is cooked above boiling point.
Reason (R):
Boiling point of water increases as the pressure increases.

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

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

c) A is true, but R is false

d) A is false, but R is true

Answer: (b)

Question : 9 [IAS Prelim]

Which one of the following types of waves are used in a night vision apparatus?

a) Microwaves

b) Radio waves

c) Infra-red waves

d) None of the above

Answer: (c)

Question : 10

Consider the following statements :

  1. Convex lens is used ina  terrestrial telescope.
  2. Convex lens of a small focal length is used as a magnifying glass.
  3. Convex lens forms an enlarged image of an object, when the object is placed beyond the focus of the lens.
Which of these statements are correct?

a) 1 and 3

b) 1 and 2

c) 2 and 3

d) 1, 2 and 3

Answer: (b)

The enlarged image is formed by a convex lens when the object is placed between F1 and 2F1. Behind 2F1 the size of the image continuous decreases.

At 2F1, the size of the image formed by the convex lens is as same as the object.

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