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 : 11 [IAS Prelim]

Cloudy nights are warmer compared to clear cloudless nights, because clouds:

a) reflect back the heat given off by earth

b) prevent clod waves from the sky from descending on earth

c) produce heat and radiate it towards earth

d) absorb heat from the atmosphere and send it towards earth

Answer: (a)

Question : 12 [PSC (Pre) 2014]

An assertion and its reason is given below.
Assertion (A):
Salt is used for cooking the food at places on higher from sea level.
Reason (R):
Temperature is low in higher places.
Which one among these is right answer?

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: (a)

Question : 13 [RAS/RTS (Pre) 1993]

The tolerable limit of noise for human being is around

a) 85 decibel

b) 125 decibel

c) 45 decibel

d) 155 decibel

Answer: (a)

Question : 14 [UPPSC (GIC) 2010]

Television signals cannot be received beyond a certain distance because

a) Air absorbs signals

b) Antenna is weak

c) Signals are weak

d) The surface of the Earth is curved

Answer: (d)

Question : 15 [UPPCS (Mains) 2008]

Which of the following lens is used to minimize Myopia?

a) Cylindrical lens

b) Concave lens

c) Convex lens

d) None of the above

Answer: (b)

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