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Important questions on Latent Heat

HARD

Burns caused by steam are more severe that burns caused by boiling water.

A

True

B

False

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HARD

What is the ration of their latent ?

A

B

C

D

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HARD

If 10 g ice at   is mixed with 10 g water at   the final temperature will be :- 

A

B

C

D

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HARD

Two different liquids of same mass are kept in two identical vessels, which are placed in a freezer that extracts heat from them at the same rate causing each liquid to transform into a solid. The schematic figure shows the temperature T vs time t plot for the two materials. We denote the specific heat in the liquid states to be and for materials and respectively, and latent heats of fusion and respectively. Choose the correct option.

A

and

B

and

C

and

D

and

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HARD

A bullet moving with a uniform velocity stops suddenly after hitting target. Let whole mass melts be , specific heat be , initial temperature be , melting point be , and the latent heat be . Then is given by 

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HARD

Boiling water and steam both have the same temperature , but steam causes many severe burns than boiling water. Explain

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HARD

Two solid objects of the same mass are supplied with heat at the same rate . The temperature of the first object with latent heat and specific heat capacity changes according to graph on the diagram. 
Based on what is shown on the graph, the latent heats and and the specific heat capacities and in solid state obey which of the following relationships:

A

$$L_1 < L_2 ; c_1

B

C

D

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HARD

It takes 10 min for an electric kettle to heat a certain quantity of water from C to C. It takes 54 min to convert this water at C into steam. Then latent heat of steam is

A

B

C

D

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HARD

A thermally isolated vessel contains of water at When air above the wall pumped out, some of the water freezes and some evaporates at itself. Calculate the number of the ice formed if no water is left in the vessel. Latent heat of vaporization of water and latent heat of fusion of ice

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HARD

A piece of ice (heat capacity and latent heat ) of mass grams is at at atmospheric pressure. It is given 420 of heat so that the ice starts melting. Finally when the ice-water mixture is in equilibrium, it is found that 1 gm of ice has melted. Assuming there is no other heat exchange in the process, the value of m is

A

8

B

7

C

9

D

6

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