Thermodynamics problems
- 1. The bomb calorimeter is used for finding the __________ calorific value of solid and liquid fuels.
Options- A. higher
- B. lower Discuss
Correct Answer: higher
- 2. The efficiency of the Carnot cycle may be increased by
Options- A. increasing the highest temperature
- B. decreasing the highest temperature
- C. increasing the lowest temperature
- D. keeping the lowest temperature constant Discuss
Correct Answer: increasing the highest temperature
- 3. Carnot cycle has maximum efficiency for
Options- A. petrol engine
- B. diesel engine
- C. reversible engine
- D. irreversible engine Discuss
Correct Answer: reversible engine
- 4. According to Regnault's law, the specific heat at constant pressure (cp) and specific heat at constant volume (cv) __________ with the change in pressure and temperature of the gas.
Options- A. change
- B. do not change Discuss
Correct Answer: do not change
- 5. The heat and work are mutually convertible. This statement is called __________ law of thermodynamics.
Options- A. Zeroth
- B. First
- C. Second Discuss
Correct Answer: First
- 6. The unit of energy is S. I. units is
Options- A. Joule (J)
- B. Joule metre (Jm)
- C. Watt(W)
- D. Joule/metre (J/m) Discuss
Correct Answer: Joule (J)
- 7. Select the correct statement as per Charles' law
Options- A. p.v = constant, if T is kept constant
- B. v/T = constant, if p is kept constant
- C. p/T = constant, if v is kept constant
- D. T/p = constant, if v is kept constant Discuss
Correct Answer: v/T = constant, if p is kept constant
- 8. Briquetted coal is produced from the finely ground coal by moulding under pressure with or without a binding material.
Options- A. True
- B. False Discuss
Correct Answer: True
- 9. Which of the following statement is correct?
Options- A. The increase in entropy is obtained from a given quantity of heat at a low temperature.
- B. The change in entropy may be regarded as a measure of the rate of the availability or unavailability of heat for transformation into work.
- C. The entropy represents the maximum amount of work obtainable per degree drop in temperature.
- D. all of the above Discuss
Correct Answer: all of the above
- 10. The polytropic index (n) is given by
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
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