Heat and Thermodynamics MCQ's 2

MCQ's with answers from chapter 11 Heat and Thermodynamics Physics book 1 for FSC pre engineering and pre medical for Board of Intermediate and Secondary education. Also For Entry Test Preparation for UET, NUST, PIEAS, GIKI, AIR, FAST, WAH University, UHS, other engineering Universities and Medical Colleges.

1. The following expression represents: ∆ U =-w

A) Adiabatic compression
B) Isobaric process
C) Isothermal expansion
D) none

2. Two gasses A and B having same no of molecules are at temp 10 degree centigrade. A is heated at constant volume and B is heated at constant pressure and their temp rises to 12 degree centigrade. Increase in internal energy in:

A) A is greater
B) In both gasses is same
C) Is greater
D) A is slightly greater

3. r is defined as:

A) Cv/Cp
B) Cp Cv
C) Cp/CV
D) Cp-Cv

4. In Carnot engine internal energy in one cycle

A) positive
B) constant
C) negative
D) zero

5. Efficiency of Carnot engine is:

A) 50%
B) minimum
C) 100%
D) maximum

6. Scale which is independent of working substance is

A) Centigrade
B) kelvin
C) fahrenheit
D) none

7. Efficiency of diesel engine is

A) 20-25 %
B) 35-40 %
C) 25-30%
D) 15-20%

8. In which stroke of petrol engine fuel is ignited

A) invake
B) power
C) compression
D) exhaust

9. During adiabatic expansion the change in the internal energy of 2 moles of a gas is 100J, the work done during this expansion is

A) zero
B) 200j
C) -100j
D) 100j

10. Average K.D of ideal gas can be written as

A) 2/3KT
B) 3RT/2
C) 2/3RT
D) 3KT/2