Physics || Quiz || Set 4
1. The velocity of sound in air at STP, according to Newton's formula is:
1) 280 ms−1
2) 380 ms−1
3) 330 ms−1
4) 340 ms−1
2. Which of the following has a maximum value of gamma = cp / cv
1) Monoatomic gas
2) Diatomic gas
3) Polyatomic gas
4) All have the same value
3. Pressure of air and temperature becomes 4 times, its effect on the speed of sound in air is:
1) No change
2) Double
3) Half
4) 4 times
4. A difference in temperature of 25 C is equivalent to the difference of:
1) 45 F
2) 72 F
3) 32 F
4) 25 F
5. Intensive property of a system is one whose value:
1) Does not depend on the mass of the system, like temperature, pressure, etc.
2) Depends on the mass of the system, like volume
3) Is not dependent on the path followed but, on the state,
4) Is dependent on the path followed and not on the state
6. At the triple point of water, a gas absorbs heat 100 J and rejects 50 J of heat at temperature T. The value of T is :
1) 120 K
2) 150 K
3) 136 K
4) 200 K
7. Heat and work are:
1) Point functions
2) System properties
3) Path functions
4) Intensive properties
8. When the temperature difference between the source and the sink increases, the efficiency of the heat engine will:
1) Increase
2) Decrease
3) Is not affected
4) May increase or decrease depending upon the nature of the working substance
9. “It is impossible to devise a process which may convert heat, extracted from a single reservoir, entirely into work without leaving any change in the working system” is the statement of:
1) Second law of thermodynamics
2) Zeroth law of thermodynamics
3) First law of thermodynamics
4) Third law of thermodynamics
10. If heat extracted from the hot reservoir is 100 J and heat rejected to the cold reservoir is 35 J, then the work in the output of the engine is:
1) 65 J
2) 135 J
3) 100 J
4) 35 J