Physics Practice: Heat (Mock Test 4 - Expert)
1. In an expert laboratory setup, two spheres of the same metal have radii in the ratio 1:2. If they are heated to the same temperature, the ratio of heat energy required is:
2. Why does a block of ice at $0^\circ C$ feel colder to the hand than water at $0^\circ C$?
3. A bimetallic strip is used in an automatic electric iron to:
4. The "Specific Heat Capacity" of a substance depends on:
5. Thermal expansion of a substance is a ________ change.
6. If a Celsius thermometer reads $40^\circ C$, the corresponding reading on the Kelvin scale is:
7. Which of the following expert devices is used to measure very high temperatures, like that of a furnace?
8. "Anomalous expansion" is a unique property of water between:
9. Heat transfer by convection is impossible in ________.
10. The temperature at which both Celsius and Fahrenheit scales show the same reading is:
11. A thermos flask prevents heat loss by radiation by using:
12. During the day, the air above the land gets hotter and rises, and cooler air from the sea blows towards the land. This is called:
13. In the formula $Q = mc\Delta T$, 'c' represents:
14. Why is mercury used in thermometers despite being toxic?
15. A substance changes from liquid to gas at its boiling point. During this process, the temperature:
16. The SI unit of temperature is:
17. Heat radiation can pass through ________.
18. Expansion of liquids is ________ that of solids for the same rise in temperature.
19. Which process causes the cooling of water in an earthen pot (surahi)?
20. The mode of heat transfer in which the actual motion of particles takes place is: