Heat & Thermodynamics Test Online MCQs

1. A black body is at a temperature 300 K. It emits energy at a rate, which is proportional to:

2. The colour of a star indicates its:

3. In an adiabatic change, the pressure and temperature of a monoatomic gas are related with relation as P ∞ T^C, where C is equal to:

4. An ideal gas at 27°C is compressed adiabatically to 8/27 its original volume [TV^γ-1 = constant] and γ = 5/3, then the rise in temperature will be:

5. Woolen clothes keep the body warm because the wool:

6. A centigrade and Fahrenheit thermometers are dipped in boiling water. The water temperature is lowered until the Fahrenheit thermometer registers a temperature of 140° the fall of the temperature as registered by the centigrade thermometer is:

7. Which one of the following is not a thermodynamical co-ordinate?

8. Heat travels through vacuum by:

9. A quantity of heat required to change the unit mass of a solid substance to its liquid state, while the temperature remains constant, is known as

10. The density of a substance at 0°C is 10 g/cc and at 100°C, its density is 9.7 g/cc. The coefficient of linear expansion of the substance is

11. During the adiabatic expansion of a gas the internal energy of a gas is found to decrease by 2 joule. The work done on gas during the process will be equal to:

12. The sun emits a light with maximum wave length 510 nm while another star emits a light with maximum wavelength of 350 nm. The ratio of surface temperature of sun and the star will be:

13. Fraunh offer line of the solar system is an example of:

14. When a solid is converted into a gas, directly by heating then this process is known as:

15. The latent heat of vaporization water is 2240 J. If the work done in the process of vaporization of 1g is 168 J, then increase in internal energy is: