Physics Practice: Heat & Energy (Mock Test 4 - Expert)
1. Expert Analysis: In a vacuum, heat transfer by conduction and convection is zero because they both require ________.
2. When water is heated from 0°C to 10°C, its volume first ________ and then ________.
3. A bimetallic strip used in a thermostat works on the principle of ________ expansion.
4. The relationship between Celsius (C) and Kelvin (K) scales is:
5. Which of the following greenhouse gases has the highest global warming potential per molecule?
6. Radiant heat is also known as ________ radiation.
7. The specific heat capacity of a substance is 'c'. The heat required to raise the temperature of mass 'm' by 'ΔT' is:
8. A body is thrown upwards. At its highest point, it possesses ________ energy.
9. Global warming leads to the melting of polar ice, which ________ the sea level.
10. Water is used as a coolant in car radiators because of its ________.
11. A temperature difference of $10^\circ\text{C}$ is equivalent to a difference of ________ on the Kelvin scale.
12. In the cold regions, the frozen upper layer of lakes acts as a/an ________ to the water below.
13. Which of the following surfaces radiates heat most effectively?
14. When two bodies reach the same temperature, the net exchange of heat between them is ________.
15. The energy transformation in a battery while in use is:
16. Ice cubes are wrapped in saw-dust because ________.
17. Heat capacity of $1\text{ kg}$ of a substance is its ________.
18. The convection current in the atmosphere is responsible for ________.
19. If the kinetic energy of a body becomes four times, its velocity has ________.
20. The mode of heat transfer in which medium particles only vibrate about their mean positions is ________.