Basic Concept

1. Which of the following are intensive properties?     

1. Kinetic Energy  2. Specific Enthalpy

3. Pressure          4. Entropy

Select the correct answer using the code given below:

(a) 1 and 3      (b) 2 and 3

(c) 1, 3 and 4  (d) 2 and 4

Answer

2. Which one of the following is the extensive property of a thermodynamic system?  

(a) Volume

(b) Pressure

(c) Temperature

(d) Density

Answer

3. A closed thermodynamic system is one in which   

(a) there is no energy or mass transfer across the boundary

(b) there is no mass transfer, but energy transfer exists

(c) there is no energy transfer, but mass transfer exists

(d) both energy and mass transfer take place across the boundary, but the mass transfer is controlled by valves

Answer

4. Which of the following is/are reversible process (es)?      

1. Isentropic expansion

2. Slow heating of water from a hot source

3. Constant pressure heating of an ideal gas from a constant temperature source

4. Evaporation of a liquid at constant temperature

Select the correct answer using the code given below:

(a) 1 only     (b) 1 and 2

(c) 2 and 3   (d) 1 and 4

Answer

5. Which one of the following correctly defines 1 K, as per the internationally accepted definition of temperature scale?    

(a) 1/100th of the difference between normal boiling point and normal freezing point of water

(b) 1/273.15th of the normal freezing point of water

(c) 100 times the difference between the triple point of water and the normal freezing point of water

(d) 1/273.15th of the triple point of water

Answer

6. Match List I(Type of Thermometer) with II (Thermometric Property)  and select the correct answer using the code given below the     

List I                                                                  ListII   

A. Mercury-in-glass                                             1. Pressure

B. Thermocouple                                                 2.Electrical resistant

C. Thermistor                                                      3.Volume

D. Constant volume gas                                       4.Induced electric voltage

:    A B C D

(a) 1 4 2 3

(b) 3 2 4 1

(c) 1 2 4 3

(d) 3 4 2 1

Answer

 7. Pressure reaches a value of absolute zero

(a) at a temperature of – 273 K

(b) under vacuum condition

(c) at the earth’s centre

(d) when molecular momentum of system becomes zero

Answer

8. The time constant of a thermocouple is the time taken to attain:

(a) the final value to he measured

(b) 50% of the value of the initial temperature difference

(c) 63.2% of the value of the initial temperature difference

(d) 98.8% of the value of the initial temperature difference

Answer

9. In a new temperature scale say oρ, the boiling and freezing points of water at one atmosphere are 100°ρ and 300°ρ respectively. Correlate this scale with the Centigrade scale. The reading of 0°ρ on the Centigrade scale is     

(a) 0°C

(b) 50°C

(c) 100°C

(d) 150°C

Answer

10. Assertion (A): Negative temperature are impossible on the Kelvin scale
Reason(R): The Kelvin scale is thermodynamics temperature scale.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R arc true but R is NOT the correct explanation of A

(c) A is true but R is false

(d) A is false but R is true

Answer

11. Internal energy of a system is dependent on the following aspects:

  1. Molecular weight
  2. Molecular structure
  3. Degree of molecular activity

Which of the above are correct?

(a) 1 and 2  (b) 1 and 3

(c) 2 and 3  (d) 1,2 and 3

Answer

12. Joule’s experiment states that for a cycle

(a) change of pressure is proportional to temperature change

(b) change of volume is proportional to temperature change

(c) change of internal energy is proportional to temperature change

(d) sum of all heat transfer is proportional to sum of all work transfer

Answer

13. Which one of the following represent open thermodynamic system?

(a) manual ice cream freezer

(b) centrifugal pump

(c) Pressure cooker

(d) Bomb calorimeter

Answer

14. An ideal gas at 27ºC is heated at constant pressure till the volume becomes three times. The temperature of the gas will then be

(a) 81ºC

(b) 900ºC

(c) 627ºC

(d) 927ºC

Answer

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