Thermal Physics and Acoustics - TRB Physics Study Materials

SI NO.	QUESTIONS		ANSWERS
1.	Heat is considered to be invisible weightless fluid called?		Caloric
2.	1kg calorie is equal to how many calories?		1000 cal
3.	Specific heat of a gas various from		None
4.	Which one is equivalent to thermal capacity?		Thermal capacity
5.	When a gas is heated at constant volume the heat supplied is?		Fully used to raise its temperature.
6.	The rise in temperature depends on?		Heat given to body and Nature of material.
7.	Newton’s law of cooling is holds good only for?		Small difference of temperature.
8.	The amount of heat energy requires to raise the temperature of whole substance through 1K is?		Thermal capacity.
9.	The caloric theory can be explained by the way of?		Conduction, Latent heat and Thermal conductivity.
10.	The heat is not indicated by thermometer is?		Latent heat.
11.	The critical temperature and the corresponding values of pressure and volume at the critical point are called?		Critical constants.
12.	The unit of water equivalent is?		Kg.
13.	A particular temperature the joule-Thomson effect changes sign is called?		Temperature of inversion.
14.	The ratio of thermal conductivity to thermal capacity per volume?		Thermal diffusivity.
15.	A device having infinite thermal capacity and which can absorb retain or reject unlimited quantity of heat?		Reservoir.
16.	Changing from one state to the other by changing the thermodynamically coordinates is called?		Process.
17.	The first law thermodynamically gives the relation between?		Heat and work done.
18.	The co-efficient of performance of a refrigerator is?		4
19.	The efficiency of a reversible engine does not depend on?		Nature of working substance.
20.	The temperature at which liquefaction takes place is called		Critical temperature
21	Amagat performed a series of experiments with hydrogen and nitrogen to study their behavior?		A high pressure
22	In Linde’s process water vapour is compressed to a pressure?		200 atm
23	Which is used as a lubricant in a low temperatures?		Petroleum ether
24	Thermal conductivity of helium II is more than?		Copper and silver
25	The instruments used to measure the solar constant are called?		Pyrheliometer