81.
Pressure cooker cooks food in lesser time because

83.
Under which condition real gas can work as an ideal gas?

84.
According to Newton's Law of Cooling the rate of cooling of a body is proportional to the

87.
Assertion (A): A piece of ice added to the drink, cools it.
Reason (R): Ice takes latent heat from the drink for melting resulting in the cooling of the drink.
Select the correct answer:

88.
Below is a statement (A) and a reason (R)-
(A): Left a small gap between tracks
(R): Iron spread in summer.

89.
The amount of radiation emitted by a perfectly black body proportional to

90.
Fruit stored in a cold chamber exhibit longer storage life because

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