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Question (1)

QN0038361

Which of the following is a state variable?

(A)
Heat
(B)
Work
(C)
Internal energy
(D)
All of these

Correct Answer: C

Explanation:

Heat and work are not state variables. They are energy, transfer to a system which change the internal energy of a system, which is a state variable.

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Question (2)

QN0038362

The internal energy of an ideal gas depends upon

(A)
specific volume
(B)
pressure
(C)
temperature
(D)
density

Correct Answer: C

Explanation:

Internal energy of an ideal gas depends only on the temperature.

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Question (3)

QN0038363

Energy transfer brought about by moving the piston of a cylinder containing the gas is known as

(A)
work
(B)
heat
(C)
pressure
(D)
temperature

Correct Answer: A

Explanation:

Work is energy transfer brought about by moving piston of a cylinder containing the gas, by raising or lowering some weight connected to it.

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Question (4)

QN0038364

At a given temperature the internal energy of a substance

(A)
in liquid state is equal to that in gaseous state.
(B)
in liquid state is less than that in gaseous state.
(C)
in liquid state is more than that in gaseous state.
(D)
is equal for the three states of matter.

Correct Answer: B

Explanation:

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Question (5)

QN0038365

A gas is compressed from a volume of to a volume of at a constant pressure of . Then it is heated at constant volume by supplying of energy. As a result, the internal energy of the gas:

(A)
increase by
(B)
decreases by
(C)
increases by
(D)
decreases by

Correct Answer: A

Explanation:

As we know,

(Ist law of thermodynamics)

or

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Question (6)

QN0038366

When a system is taken from state to state along the path iaf, it is found that cal and . Along the path cal. along the path ibf is

(A)
(B)
6 cal
(C)
(D)

Correct Answer: B

Explanation:

For path iaf,

By first law of thermodynamics,

.

For path ibf

?

or,

Since, the change in internal energy does not depend on the path, therefore

.

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Question (7)

QN0038367

The pressure-volume diagram shows six curved paths that can be followed by the gas (connected by vertical paths). Which two of them should be part of a closed cycle if the net work done by the gas is to be its maximum positive value?

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

Correct Answer: B

Explanation:

Work done in expansion is positive and in compression it is negative.

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Question (8)

QN0038368

In thermodynamics, heat and work are :

(A)
Point functions
(B)
Extensive thermodynamic state variables
(C)
Path functions
(D)
Intensive thermodynamic state variables

Correct Answer: C

Explanation:

Heat and work depends on the path taken to reach a specific value. Hence, heat and work are path functions.

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Question (1)

Which of the following is a state variable?

Explanation:

Link:

Question (2)

The internal energy of an ideal gas depends upon

Explanation:

Link:

Question (3)

Energy transfer brought about by moving the piston of a cylinder containing the gas is known as

Explanation:

Link:

Question (4)

At a given temperature the internal energy of a substance

Explanation:

Link:

Question (5)

A gas is compressed from a volume of to a volume of at a constant pressure of . Then it is heated at constant volume by supplying of energy. As a result, the internal energy of the gas:

Explanation:

Link:

Question (6)

When a system is taken from state to state along the path iaf, it is found that cal and . Along the path cal. along the path ibf is

Explanation:

Link:

Question (7)

The pressure-volume diagram shows six curved paths that can be followed by the gas (connected by vertical paths). Which two of them should be part of a closed cycle if the net work done by the gas is to be its maximum positive value?

Explanation:

Link:

Question (8)

In thermodynamics, heat and work are :

Explanation:

Link:

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