Ch # 11
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Saim Academy of Computer Science 88/W.B Physics (1st)
Marks: 30
Ch 11 FULL
Time: 1 hour
Test.No.11
M.C.QโS Q.1 i.
Encircle the best answer.cutting over-writing is not allowed Temperature of a gas is increased from 270 C to 1270C. The ratio of its mean K:E will be: a) ยพ
ii.
b) 9/16
vi. vii. viii. ix. x.
b) decrease
c) remain constant
d) first increase then decrease
b) isochoric
c) isothermal
d) adiabatic
First law of thermodynamics for an adiabatic process will be written as: a) Q = W
v.
d) 10/9
If the temperature of a system is kept constant, the process is called: a) Isobaric
iv.
c) 4/3
The internal energy of a piece of lead when beaten by hammer will: a) Increase
iii.
10
b) Q = -W
c) W = -โ๐
d) ๐ = โ๐
A heat engine operates b/w the temperature 1000k and 400k. Its efficiency can be equal to: a) 50% b) 60% c) 70% d) 100 % An adiabatic process is that which has constant: a) Entropy b) volume c) pressure d) temperature A device based upon the thermodynamic property of matter is called: a) Colorimeter b) heat engine c) thermometer d) Voltmeter How much energy petrol engine converts into work: a) 100% b) 75% c) 50% d) 25% Boltzmann constant โkโ has same unit as: a) Temperature b) energy c) entropy d) pressure The internal energy of system does not depend on: a) Temperature b) pressure c) path d) initial and final state
SUBJECTIVE Q.2 Write the short answers
06 x 02 = 12
i)
Why is the average velocity of the molecules in a gas zero but the average of the square of velocities is not zero?
ii)
Derive Charlesโ law from kinetic molecular theory of gas.
iii)
Why does the pressure of a gas in a car tyre increase when it is driven through some distance?
iv)
Give the four postulates of kinetic molecular theory of gas.
v)
A thermos flask containing milk as a system is shaken rapidly. Does the temperature of milk rise?
vi)
How petrol engine differ from diesel engine?
EXTENSIVE Q.3
(a) b)
5+3=8
What is Canot theorem?discribe its four steps of its cycle and calculate efficiency of Canot engine. A thermodynamic system undergoes a process in which its internal energy decreases by 300 J. If at the same time 120 J of work is done on the system, find the heat lost by the system.
M.SHAFIQ M.Sc Mathematics 1
1a 2a 3c 4c 5b 6a 7c 8d 9c 10c
Marks: 30
Ch 11 FULL
Time: 1 hour
Test.No.11
M.C.QโS Q.1 i.
Encircle the best answer.cutting over-writing is not allowed Temperature of a gas is increased from 270 C to 1270C. The ratio of its mean K:E will be: a) ยพ
ii.
b) 9/16
vi. vii. viii. ix. x.
b) decrease
c) remain constant
d) first increase then decrease
b) isochoric
c) isothermal
d) adiabatic
First law of thermodynamics for an adiabatic process will be written as: a) Q = W
v.
d) 10/9
If the temperature of a system is kept constant, the process is called: a) Isobaric
iv.
c) 4/3
The internal energy of a piece of lead when beaten by hammer will: a) Increase
iii.
10
b) Q = -W
c) W = -โ๐
d) ๐ = โ๐
A heat engine operates b/w the temperature 1000k and 400k. Its efficiency can be equal to: a) 50% b) 60% c) 70% d) 100 % An adiabatic process is that which has constant: a) Entropy b) volume c) pressure d) temperature A device based upon the thermodynamic property of matter is called: a) Colorimeter b) heat engine c) thermometer d) Voltmeter How much energy petrol engine converts into work: a) 100% b) 75% c) 50% d) 25% Boltzmann constant โkโ has same unit as: a) Temperature b) energy c) entropy d) pressure The internal energy of system does not depend on: a) Temperature b) pressure c) path d) initial and final state
SUBJECTIVE Q.2 Write the short answers
06 x 02 = 12
i)
Why is the average velocity of the molecules in a gas zero but the average of the square of velocities is not zero?
ii)
Derive Charlesโ law from kinetic molecular theory of gas.
iii)
Why does the pressure of a gas in a car tyre increase when it is driven through some distance?
iv)
Give the four postulates of kinetic molecular theory of gas.
v)
A thermos flask containing milk as a system is shaken rapidly. Does the temperature of milk rise?
vi)
How petrol engine differ from diesel engine?
EXTENSIVE Q.3
(a) b)
5+3=8
What is Canot theorem?discribe its four steps of its cycle and calculate efficiency of Canot engine. A thermodynamic system undergoes a process in which its internal energy decreases by 300 J. If at the same time 120 J of work is done on the system, find the heat lost by the system.
M.SHAFIQ M.Sc Mathematics 1
1a 2a 3c 4c 5b 6a 7c 8d 9c 10c
