Thermodynamics Test

Result

Thermodynamics Test - 40

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Weekly Quiz Competition

Question 1
4 / -1

For which combination of working temperatures the efficiency of Carnot's engine is highest.

A
80 K, 60 K

B
100 K, 80 K

C
60 K, 40 K

D
40 K, 20 K
Question 2
4 / -1

An ideal heat engine working between temperature T₁ and T₂ has an efficiency n. The new efficiency if both the source and sink temperature are doubled, will be

A
n

B
2n

C
3n

D
n/2
Question 3
4 / -1

A carnot engine Converts one sixth of the heat input into work. When the temperature of the sink is reduces by 62^o C the efficiency of the engine is doubled. The temperature of the source and sink are

A
80^oC, 37^oC

B
95^oC, 28^oC

C
90^oC, 37^oC

D
99^oC, 37^oC

Solution
Question 4
4 / -1

A carnot engine having a efficiency of n = 1/10 as heat engine is used as a refrigerators. if the work done on the system is 10 J. What is the amount of energy absorbed from the reservoir at lower temperature !

A
1 J

B
90 J

C
99 J

D
100 J

Solution
Question 5
4 / -1

The temperature of sink of car not engine is 27^o C. Efficiency of engine is 25% Then find the temperature of source.

A
227^o C

B
327^o C

C
27^o C

D
127^o C

Solution
Question 6
4 / -1

If the doors of a refrigerators is kept open, then which of the following is true?

A
Room is cooled

B
Room is eithers cooled or heated

C
Room is neither cooled nor heated

D
Room is heated
Question 7
4 / -1

Assertion : The melting point of ice decreases with increase of Pressure
Reason : Ice contracts on melting.
(A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(B) If both assertion and reason are true but reason is not be correct explanation of assertion.
(C) If assertion is true but reason is false.
(D) If the assertion and reason both are false.

A
C

B
B

C
A

D
D
Question 8
4 / -1

Assertion : Fahrenhit is the smallest unit measuring temperature.
Reason : Fahrenhit was the first temperature scale used for measuring temperature.
(A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(B) If both assertion and reason are true but reason is not be correct explanation of assertion.
(C) If assertion is true but reason is false.
(D) If the assertion and reason both are false.

A
A

B
C

C
B

D
D
Question 9
4 / -1

Assertion : A beaker is completely, filled with water at 4^oC. It will overflow, both when heated or cooled.
Reason : These is expansion of water below 4^oC
(A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(B) If both assertion and reason are true but reason is not be correct explanation of assertion.
(C) If assertion is true but reason is false.
(D) If the assertion and reason both are false.

A
A

B
B

C
C

D
D
Question 10
4 / -1

Assertion : The total translation kinetic energy of all the molecules of a given mass of an ideal gas is 1-5 times the product of its Pressure and its volume.
Reason : The molecules of a gas collide with each other and velocities of the molecules change due to the collision
(A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(B) If both assertion and reason are true but reason is not be correct explanation of assertion.
(C) If assertion is true but reason is false.
(D) If the assertion and reason both are false.

A
D

B
C

C
A

D
B

Solution

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Thermodynamics Test - 40

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Thermodynamics Test - 40

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Question 1

80 K, 60 K

100 K, 80 K

60 K, 40 K

40 K, 20 K

Question 2

n

2n

3n

n/2

Question 3

80oC, 37oC

95oC, 28oC

90oC, 37oC

99oC, 37oC

Solution

Question 4

1 J

90 J

99 J

100 J

Solution

Question 5

227o C

327o C

27o C

127o C

Solution

Question 6

Room is cooled

Room is eithers cooled or heated

Room is neither cooled nor heated

Room is heated

Question 7

C

B

A

D

Question 8

A

C

B

D

Question 9

A

B

C

D

Question 10

D

C

A

B

Solution

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80^oC, 37^oC

95^oC, 28^oC

90^oC, 37^oC

99^oC, 37^oC

227^o C

327^o C

27^o C

127^o C