61. The temperature of the sun is measured with
62. Cryogenic shows-
63. It is more comfortable to wear white cloth in summer because
64. Gases have
65. Which of the following law states that good absorbers of heat are good emitters?
66. The average kinetic energy of the molecules of an ideal gas is directly proportional to
67. The first law of thermodynamics is simply the case of
68. Consider the following statements.
Assertion (A) Light coloured clothes are preferred in summer.
Reason (R) Light colours are poor absorbers of heat.
Select correct answer:
Assertion (A) Light coloured clothes are preferred in summer.
Reason (R) Light colours are poor absorbers of heat.
Select correct answer:
69. A hot body cools from 90°C to 75°C in 25 second. The same body in further cooling from 75°C to 60°C will take how much time?
70. The amount of radiation mainly depends upon the-
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