61. Surface water of a lake is about to freeze. What will be the temperature (in °C) of water at the bottom of the lake?
62. Which of the following statement(s) about specific heat of a body is/are correct?
1. It depends upon mass and shape of the body.
2. It is independent of mass and shape of the body.
3. It depends only upon the temperature of the body.
1. It depends upon mass and shape of the body.
2. It is independent of mass and shape of the body.
3. It depends only upon the temperature of the body.
63. Why are dewdrops not formed on a cloudy night?
64. Assertion (A): The handle of pressure cooker is made up of Abonite.
Reason (R): Abonite is a hard material.
Reason (R): Abonite is a hard material.
65. The woollen clothes keep us warm in winter because they
66. What is the use of thermostat?
67. Thermal conductivity of a solid metal with increasing temperature-
68. Clear nights are colder than cloudy nights because of . . . . . . . .
69. Heat transfer horizontally within the atmosphere is called
70. When soggy biscuits are kept inside the fridge for sometime they become crisp because
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