Heat & Thermodynamics Test Online MCQs

1. The volume of a gas is reduced adiabatically to (1/4) of its volume at 27°C. If γ = 1.4. The new temperature will be:

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

3. The real coefficient of volume expansion of glycerine is 0.000597 per °C and linear coefficient of expansion of glass is 0.000009 per °C. Then the apparent volume coefficient of expansion of glycerine is:

4. 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:

5. The colour of a star indicates its:

6. In an adiabatic process the quantity which remains constant is:

7. The surface temperature of a body is 727°C and that of another body is 327. The ratio of total energies radiated by them is:

8. 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

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 average kinetic energy of a gas molecule at 27°C is 6.21 x 10⁻²¹J, then its average kinetic energy at 227°C is:

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

12. A black body is heated from 27°C to 127°C. The ratio of their energies of radiation emitted will be:

13. 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:

14. The thermal conductivity of a rod is 2. What is its thermal resistivity?

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