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Question (1)

QN0038369

A thermodynamic system is taken from state to along and is brought back to along as shown in the diagram. The net work done during the complete cycle is given by the area

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

Work done Area under curve

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Question (2)

QN0038370

In diagram shown in figure is a semicircle. The work done in the process is

(A)
(B)
(C)
(D)
zero

Correct Answer: C

Explanation:

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Question (3)

QN0038371

First law of thermodynamics states that

(A)
system can do work
(B)
system has temperature
(C)
system has pressure
(D)
heat is a form of energy

Correct Answer: D

Explanation:

Heat always refers to energy transmitted from one body to another because of temperature difference.

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Question (4)

QN0038372

The first law of thermodynamics expresses

(A)
law of conservation of momentum
(B)
law of conservation of energy
(C)
law of conservation of mass
(D)
All of the above

Correct Answer: B

Explanation:

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Question (5)

QN0038373

In changing the state of thermodynamics from to state, the heat required is and the work done by the system is . The change in its internal energy is

(A)
(B)
Q - W
(C)
Q
(D)

Correct Answer: B

Explanation:

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Question (6)

QN0038374

Which of the following is incorrect regarding first law of thermodynamics?

(A)
It is a restatement of principle of conservation of energy.
(B)
It is applicable to cyclic processes
(C)
It introduces the concept of entropy
(D)
It introduces the concept of internal energy

Correct Answer: C

Explanation:

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Question (7)

QN0038375

110 joules of heat is added to a gaseous system, whose internal energy is ; then the amount of external work done is

(A)
(B)
(C)
(D)

Correct Answer: B

Explanation:

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Question (8)

QN0038376

The change in internal energy of a thermodynamical system which has absorbed of heat and done of work is

(A)
(B)
(C)
(D)

Correct Answer: B

Explanation:

According to first law of thermodynamics

Given :

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Question (9)

QN0038377

If the amount of heat given to a system is and the amount of work done on the system is , then the change in internal energy of the system is

(A)
(B)
(C)
(D)

Correct Answer: D

Explanation:

According to first law of thermodynamics

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Question (10)

QN0038378

A perfect gas goes from a state to another state by absorbing of heat and doing of external work. It is now transferred between the same two states in another process in which it absorbs of heat. In the second process

(A)
work done by gas is
(B)
work done on gas is
(C)
work done by gas is
(D)
work done on the gas is

Correct Answer: D

Explanation:

-ve sign indicates that work done on the gas is .

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Question (1)

A thermodynamic system is taken from state to along and is brought back to along as shown in the diagram. The net work done during the complete cycle is given by the area

Explanation:

Link:

Question (2)

In diagram shown in figure is a semicircle. The work done in the process is

Explanation:

Link:

Question (3)

First law of thermodynamics states that

Explanation:

Link:

Question (4)

The first law of thermodynamics expresses

Explanation:

Link:

Question (5)

In changing the state of thermodynamics from to state, the heat required is and the work done by the system is . The change in its internal energy is

Explanation:

Link:

Question (6)

Which of the following is incorrect regarding first law of thermodynamics?

Explanation:

Link:

Question (7)

110 joules of heat is added to a gaseous system, whose internal energy is ; then the amount of external work done is

Explanation:

Link:

Question (8)

The change in internal energy of a thermodynamical system which has absorbed of heat and done of work is

Explanation:

Link:

Question (9)

If the amount of heat given to a system is and the amount of work done on the system is , then the change in internal energy of the system is

Explanation:

Link:

Question (10)

A perfect gas goes from a state to another state by absorbing of heat and doing of external work. It is now transferred between the same two states in another process in which it absorbs of heat. In the second process

Explanation:

Link:

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