# Heat

## 1 Marks Question

1. On what factors do the quantity of heat of an object depend?
2. The quantity of heat of an object depends on the mass of an object, specific heat capacity and difference in temperature.
3. Write the relation between heat gain or loss by a body with its surface area.
4. The larger the area exposed to the surrounding higher will be the loss of heat and vice versa.
5. What is heat equation?
6. The heat equation states that the quantity of heat lost or gained by a body is equal to the product of mass, specific heat capacity and temperature difference of the body. That is, Q = m.s.dt
7. Write the boiling point and freezing point of mercury.
8. The boiling point 357°C is and freezing point is -39°C.
9. Define heat in terms of kinetic energy of molecules.
10. The sum of kinetic energy contained by the molecules of an object is called heat.
11. What is specific heat capacity?
12. The amount of heat required to raise or decrease the temperature of 1 kg of a substance by 1°C is called specific heat capacity. Its unit is J/kg°C.
More info: The value of specific heat capacity of water is 4200 J/kg°C, Oil is 2000 J/kg°C, sand is 800 J/kg°C.
13. Write the name of any two thermometric liquids.
14. The name of any two thermometric liquids is alcohol, and mercury.
15. What are the boiling point and freezing point of alcohol at normal pressure?
16. The boiling point of alcohol is 78°C and the freezing point is -117°C at normal pressure.
17. Define heat energy.
18. The energy that flows from a hotter body to another body producing the sensation of hotness and coldness is called heat energy.
19. Define one calorie heat.
20. One calorie of heat is defined as the amount of heat required to raise the temperature of 1 gm of pure water by 1°C.
21. What is the boiling point of water in Kelvin unit?
22. The boiling point of water in Kelvin unit is 373 K.
More info: The boiling point of water in Celsius unit is 100°C and in Fahrenheit unit is 212°F.
23. What is the normal body temperature of a healthy human on the Fahrenheit scale?
24. The normal body temperature of a healthy human on a Fahrenheit scale is 98.6°F.
More info: In Celsius is 37°C and in Kelvin scale is 310 K.
25. Name the instrument which is made on the basis of expansion of heat.
26. Thermometer is made on the basis of expansion of heat.
27. What does it mean by the specific heat capacity of a substance is 140 J/kg°C?
28. It means that 140 joules of heat energy are required to raise or decrease the temperature of 1 kg by 1°C temperature.