Physics || Quiz || Set 2
1. Velocity of sound in vacuum at 0 C is:
1) 332 ms−1
2) 280 m−1
3) Zero
4) 332 cm−1
2. The velocity of sound is increased by approximately _______ when the temperature rises by 1 C:
1) 0.61 ms-1
2) 610 mms-1
3) 61 cms-1
4) All of these
3. The temperature at which the speed of sound in the air becomes double its value at 0 C is:
1) 819 C
2) 819 K
3) 1092 K
4) Both A & B
4. Which of the following items is not a path function?
1) Heat
2) Work
3) Kinetic Energy
4) Thermal conductivity
5. When two identical waves reach a point simultaneously having the same frequency then the process may not be?
1) Interference
2) Stationary waves
3) Beats
4) None of these
6. 1st law of thermodynamics is the consequence of the conservations of
1) Work
2) Energy
3) Heat
4) All of the above
7. At what temperature the Fahrenheit and Celsius scales are equivalent
1) 40
2) 30
3) -40
4) -20
8. Gases have:
1) Only one value of specific heat
2) Two values of specific heat
3) Three values of specific heat
4) No value of specific heat
9. Efficiency of a petrol engine is about:
1) 15-25%
2) 25-30%
3) 35-40%
4) 45-55%
10. The turbine in a str=eam power plant takes heat from a boiler at 427 C and exhausts it into the low-temperature reservoir at 77 C. The efficiency is:?
1) 25%
2) 50%
3) 75%
4) 100%