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Question (1)

QN0035732

A quantity of heat required to change the unit mass of a solid substance, from solid state to liquid state, while the temperature remains constant, is known as

(A)
latent heat
(B)
hoar frost
(C)
sublimation
(D)
latent heat of fusion

Correct Answer: D

Explanation:

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Question (2)

QN0035733

A block of ice at is slowly heated and converted to steam at . Which of the following curves represents the phenomenon qualitatively

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

Correct Answer: A

Explanation:

Initially, on heating temperature rises from to . then ice melts and temperature does not rise. After the whole ice has melted, temperature beigins to rise until it reaches . then it becomes constant, as at the boiling point will not rise.

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Question (3)

QN0035734

In the plot of temperature versus time showing changes in the state of ice on heating, which part represents constant temperature?

(A)
(B)
(C)
CD
(D)
All of these

Correct Answer: A

Explanation:

refers to change of state from ice to water without change of temperature.

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Question (4)

QN0035735

Assuming no heat losses, the heat released by the condensation of of steam at can be used to convert of ice at into water at , the ratio is :

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

Correct Answer: C

Explanation:

The heat lost in condensation .

or .

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Question (5)

QN0035736

The latent heat of vaporization of a substance is always

(A)
greater than its latent heat of fusion
(B)
greater than its latent heat of sublimation
(C)
equal to its latent heat of sublimation
(D)
less than its latent heat of fusion

Correct Answer: A

Explanation:

The latent heat of vaporization is always greater than latent heat of fusion because in liquid to vapour phase change there is a large increase in volume. Hence. more heat is required as compared to solid to liquid phase change.

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Question (6)

QN0035737

In an energy recycling process, of steam at becomes water at which converts y of ice at into water at . The numeric value of is

(A)
100
(B)
200
(C)

300
(D)
400

Correct Answer: C

Explanation:

Specific heat of water

Latent heat of fusion

Latent heat of vapourisation

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Question (7)

QN0035738

Two different metal bodies and of equal mass are heated at a uniform rate under similar conditions. The variation of temperature of the bodies is graphically represented as shown in the figure. The ratio of specific heat capacities is :

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

Correct Answer: B

Explanation:

From,

Rate of heat is same for both gases

i.e.,

or,

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Question (8)

QN0035739

A copper block is heated to and then it is placed on a large block of ice at . If the specific heat capacity of copper is and latent heat of fusion of water is , the amount of ice that can melt is

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

Correct Answer: C

Explanation:

Let of ice can melt

Using law of Calorimetry,

Heat lost by copper Heat gained by ice

or

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Question (9)

QN0035740

A student takes wax (specific heat ) and heats it till it boils. The graph between temperature and time is as follows. Heat supplied to the wax per minute and boiling point are respectively

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

Correct Answer: C

Explanation:

Since specific heat From graph it is clear that in a minute, the temperature is raised from to .

Heat required for a minute .

Also from graph, Boiling point of wax is .

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Question (10)

QN0035741

A piece of ice falls from a height so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of is : [Latent heat of ice is and ]

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

Correct Answer: C

Explanation:

According to question only one-quarter of the heat produced by falling piece of ice is absorbed in the melting of ice. i.e., .

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Question (1)

A quantity of heat required to change the unit mass of a solid substance, from solid state to liquid state, while the temperature remains constant, is known as

Explanation:

Link:

Question (2)

A block of ice at is slowly heated and converted to steam at . Which of the following curves represents the phenomenon qualitatively

Explanation:

Link:

Question (3)

In the plot of temperature versus time showing changes in the state of ice on heating, which part represents constant temperature?

Explanation:

Link:

Question (4)

Assuming no heat losses, the heat released by the condensation of of steam at can be used to convert of ice at into water at , the ratio is :

Explanation:

Link:

Question (5)

The latent heat of vaporization of a substance is always

Explanation:

Link:

Question (6)

In an energy recycling process, of steam at becomes water at which converts y of ice at into water at . The numeric value of is

Explanation:

Link:

Question (7)

Two different metal bodies and of equal mass are heated at a uniform rate under similar conditions. The variation of temperature of the bodies is graphically represented as shown in the figure. The ratio of specific heat capacities is :

Explanation:

Link:

Question (8)

A copper block is heated to and then it is placed on a large block of ice at . If the specific heat capacity of copper is and latent heat of fusion of water is , the amount of ice that can melt is

Explanation:

Link:

Question (9)

A student takes wax (specific heat ) and heats it till it boils. The graph between temperature and time is as follows. Heat supplied to the wax per minute and boiling point are respectively

Explanation:

Link:

Question (10)

A piece of ice falls from a height so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of is : [Latent heat of ice is and ]

Explanation:

Link:

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