Heat Thermodynamics Test

Result

Heat Thermodynamics Test - 3

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Weekly Quiz Competition

Question 1
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Which of the following are incorrect regarding the first law of thermodynamics?

A. It is not applicable to any cyclic process.

B. It is a restatement of the principle of conservation of energy.

C. It introduces the concept of internal energy.

D. It introduces the concept of entropy.

A
A and D

B
B and C

C
C and A

D
A and B

Solution

Both A and D are incorrect.
Question 2
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Consider the following statements (A) and (B). Read the statements and mark the correct answer.

A. First law of thermodynamics specifies the conditions under which a body can use its heat energy to produce work.

B. Second law of thermodynamics states that heat always flows from a hot body to a cold body.

A
Both A and B are true.

B
Both A and B are false.

C
A is true, but B is false.

D
A is false, but B is true.

Solution

Both statements are correct.

As First law of thermodynamics gives ΔQ = ΔU + W

The second law of thermodynamics is a general principle which places constraints upon the direction of heat transfer and the attainable efficiencies .
Question 3
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Choose the correct option that suits Assertion and Reason from the given below :

(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 the reason is not the correct explanation of the assertion.

(c) If assertion is true statement but reason is false.

(d) If both assertion and reason are false statements

Assertion : The Carnot cycle is useful in understanding the performance of heat engines.

Reason : The Carnot cycle provides a way of determining the maximum possible efficiency achievable with reservoirs of given temperatures.

A
a

B
b

C
c

D
d

Solution

Both statements are correct as from Carnot cycle, we can conclude that the efficiency of the heat engine is always less than 1.