71. Consider the following statements.
1. Steam at 100°C and boiling water at 100°C contain same amount of heat.
2. Latent heat of fusion of ice is equal to the latent heat of vaporization of water.
3. In an air conditioner, heat is extracted from the room air at the evaporator coils and is ejected out at the condensor coils.
Which of these statements is/are correct?
1. Steam at 100°C and boiling water at 100°C contain same amount of heat.
2. Latent heat of fusion of ice is equal to the latent heat of vaporization of water.
3. In an air conditioner, heat is extracted from the room air at the evaporator coils and is ejected out at the condensor coils.
Which of these statements is/are correct?
72. Centigrade which is the mother's unit of temperature is named on which of the following-
73. Assertion (A) A piece of ice added to drink, cools it.
Reason (R) Ice takes latent heat from the drink for melting resulting the cooling of the drink.
Select the correct answer:
Reason (R) Ice takes latent heat from the drink for melting resulting the cooling of the drink.
Select the correct answer:
74. A gas thermometer is more sensitive than a liquid thermometer because a gas
75. Which of the following is the more thermal insulation in the group?
76. Borosilicate glass ware is used in microwave ovens because-
77. In a pressure cooker food is cooked in shorter time because
78. The density of the liquid when heated
79. The absolute zero is a temperature at which . . . . . . . .
80. Assertion (A): Woollen clothes keeps us warm.
Reason (R): Woollen fibres are made from a special type of protein, which is a bad conductor of heat.
Select the correct answer:
Reason (R): Woollen fibres are made from a special type of protein, which is a bad conductor of heat.
Select the correct answer:
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