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# Selina solutions for Concise Physics Class 10 ICSE chapter 11 - Calorimetry [Latest edition]

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## Chapter 11: Calorimetry

Exercise - 11 (A)Exercise - 11 (B)Others

#### Selina solutions for Concise Physics Class 10 ICSE Chapter 11 Calorimetry Exercise Exercise - 11 (A) [Pages 269 - 270]

Exercise - 11 (A) | Q 1 | Page 269

Define the term heat.

Exercise - 11 (A) | Q 2 | Page 269

Name the S.I. unit of heat.

Exercise - 11 (A) | Q 3 | Page 269

Define the term calorie. How is it related to joule(the S.I. unit of heat)?

Exercise - 11 (A) | Q 4 | Page 269

Define one kilo-calorie of heat.

Exercise - 11 (A) | Q 5 | Page 269

Define temperature and name its S.I. unit.

Exercise - 11 (A) | Q 6 | Page 269

Differentiate between heat and temperature.

Exercise - 11 (A) | Q 7 | Page 269

Define calorimetry ?

Exercise - 11 (A) | Q 8 | Page 269

Define the term heat capacity and state its S.I. unit.

Exercise - 11 (A) | Q 9 | Page 269

Define the term specific heat capacity and state its S.I. unit.

Exercise - 11 (A) | Q 10 | Page 269

How is heat capacity of a body related to specific heat capacity of its substance?

Exercise - 11 (A) | Q 11 | Page 269

Differentiate between heat capacity and specific heat capacity.

Exercise - 11 (A) | Q 12 | Page 270

Name a liquid which has the highest specific heat capacity.

Exercise - 11 (A) | Q 13 | Page 270

Write the approximate value of specific heat capacity of water in S.I. unit.

Exercise - 11 (A) | Q 14.1 | Page 270

What do you mean by the following statement :

The heat capacity of a body is  50JK^-1  ?

Exercise - 11 (A) | Q 14.2 | Page 270

What do you mean by the following statement :

The specific heat capacity of copper is 0. 4 Jg^-1K^-1.

Exercise - 11 (A) | Q 15 | Page 270

Specific heat capacity of a substance A is 3.8 J g-1 K-1 and of substance B is 0.4 Jg-1 k-1. Which substance is a good conductor of heat? How did you arrive at your conclusion?

Exercise - 11 (A) | Q 16 | Page 270

Name two factors on which the heat energy librated by a body on cooling depends.

Exercise - 11 (A) | Q 17 | Page 270

Name three factors on which heat energy absorbed by a body depends and state how does it
depend on them.

Exercise - 11 (A) | Q 18 | Page 270

Write the expression for the heat energy Q received by the substance when m kg of substance
of specific heat capacity c Jkg^-1 k^-1 is heated through Δt° C.

Exercise - 11 (A) | Q 19 | Page 270

Same amount of heat is supplied to two liquid A and B. The liquid A and B. The liquid A
shows a greater rise in temperature. What can you say about the heat capacity of A as compared
to that of B?

Exercise - 11 (A) | Q 20 | Page 270

Two metallic blocks P and Q of masses in ratio 2 : 1 are given same amount of heat. If their
temperature rise by same amount, compare their specific heat capacities.

Exercise - 11 (A) | Q 21 | Page 270

What is the principle of method of mixture (or principle of calorimetry)? Name the law on which
this principle is based.

Exercise - 11 (A) | Q 22 | Page 270

A mass m1 of a substance of specific heat capacity c1 at temperature t1 is mixed with a mass m2
of other substance of specific heat capacity c2 at a lower temperature t2. Deduce the expression
for the temperature of the mixture. State the assumption made, if any.

Exercise - 11 (A) | Q 23 | Page 270

Why do the farmers fill their fields with water on a cold winter night?

Exercise - 11 (A) | Q 24 | Page 270

Discuss the role of high specific heat capacity of water with reference to climate in coastal areas.

Exercise - 11 (A) | Q 25 | Page 270

Water is used in hot water bottles for fomentation give a reason.

Exercise - 11 (A) | Q 26 | Page 270

Water property of water makes it an effective coolant?

Exercise - 11 (A) | Q 27.1 | Page 270

Give one example where high specific heat capacity of water is used as cooling purposes?

Exercise - 11 (A) | Q 27.2 | Page 270

Give one example where high specific heat capacity of water is used as heat reservoir ?

Exercise - 11 (A) | Q 28.1 | Page 270

A liquid X has specific heat capacity higher than the liquid Y. Which liquid is useful as coolant in car radiators .

Exercise - 11 (A) | Q 28.2 | Page 270

A liquid X has specific heat capacity higher than the liquid Y. Which liquid is useful as heat reservoir to keep juice bottles without freezing?

Exercise - 11 (A) | Q 29.1 | Page 270

What is a calorimeter?

Exercise - 11 (A) | Q 29.2 | Page 270

Name the material of which it is made of. Give two reasons for using the material stated by you.

Exercise - 11 (A) | Q 29.3 | Page 270

Out of the three metals A, B and C of specific heat 900 J kg-1 °C-1, 380 J kg-1 °C-1 and 460 J kg-1 °C-1 respectively, which will you prefer for calorimeter? Given reason.

Exercise - 11 (A) | Q 29.4 | Page 270

How is the loss of heat due to radiation minimised in a calorimeter?

Exercise - 11 (A) | Q 30 | Page 270

Why is the base of a cooking pan generally made thick?

#### Selina solutions for Concise Physics Class 10 ICSE Chapter 11 Calorimetry Exercise Exercise - 11 (A) [Page 270]

Exercise - 11 (A) | Q 1 | Page 270

The S.I. unit of heat capacity is :

• J kg-1

• J K-1

• J kg-1 K-1

• cal 0C-1

Exercise - 11 (A) | Q 2 | Page 270

The S.I. unit of specific heat capacity is :

• J kg-1

• J K-1

• J kg-1 K-1

• kilocal kg-10C-1

Exercise - 11 (A) | Q 3 | Page 270

The specific heat capacity of water is :

• 4200 J kg-1 K-1

• 420 J g-1 K-1

• 0.42 J g-1 K-1

• 4.2 J kg-1 K-1

#### Selina solutions for Concise Physics Class 10 ICSE Chapter 11 Calorimetry Exercise Exercise - 11 (A) [Pages 270 - 271]

Exercise - 11 (A) | Q 1 | Page 270

By imparting heat to a body its temperature rises by 15° C. what is the corresponding rise in temperature on kelvin scale?

Exercise - 11 (A) | Q 2 | Page 270

(a) Calculate the heat capacity of a copper vessel of mass 150g if the specific heat capacity of copper is 410 J kg^-1 K^-1
(b) How much heat energy will be required to increase the temperature of the vessel in part (a) from 25°C to 35°C?

Exercise - 11 (A) | Q 3.1 | Page 271

A piece of iron of mass 2.0 kg has a thermal capacity of 966 "J" "K"^-1. Find : heat energy needed to warm it by 15°C

Exercise - 11 (A) | Q 3.2 | Page 271

A piece of iron of mass 2.0 kg has a thermal capacity of 966 J K-1. Find Its specific heat capacity in S.I unit.

Exercise - 11 (A) | Q 4 | Page 271

Calculate the amount of heat energy required to raise the temperature of 100 g of copper from 20°C to 70°C. specific heat capacity of copper = 390 J kg^-1 K^-1.

Exercise - 11 (A) | Q 5 | Page 271

1300 J of heat energy is supplied to raise the temperature of 0.5 kg of lead from 20° C to 40°C.
Calculate the specific heat capacity of lead

Exercise - 11 (A) | Q 6 | Page 271

Find the time taken by a 500 W heater to raise the temperature of 50 kg of material of specific
heat capacity 960 "J kg"^-1"K"^-1, from 18°C to 38° C. assume that all the heat energy supplied by the heater is given to the material.

Exercise - 11 (A) | Q 7 | Page 271

An electric heater of power 600 W raises the temperature of 4.0 kg of a liquid from 10.0 ℃ to
15.0 ℃ I 100 s. Calculate: (i) the heat capacity of 4.0 kg of liquid, (ii) the specific heat capacity
of the liquid.

Exercise - 11 (A) | Q 8 | Page 271

0.5 kg of lemon squash at 30° C is placed in a refrigerator which can remove heat at an average
rate of 30 J s^-1. How long will it take to cool the lemon squash to 5°C? Specific heat capacity of
squash = 4200 J kg^-1K^-1

Exercise - 11 (A) | Q 9 | Page 271

A mass of 50g of a certain metal at 150° C is immersed in 100g of water at 11° C. The final temperature is 20° C. Calculate the specific heat capacity of the metal. Assume that the specific heat capacity of water is 4.2 J g-1 K-1.

Exercise - 11 (A) | Q 10 | Page 271

45 g of water at 50°C in a beaker is cooled when 50 g of copper at 18° C is added to it. The  contents are stirred till a final constant temperature is reached. Calculate this final temperature.The specific heat capacity of copper is 0.39 J g^-1K^-1 and that of water is 4.2 J g^-1K^-1 State theassumption used.

Exercise - 11 (A) | Q 11 | Page 271

200 g of hot water at 80°C is added to 300 g of cold water at 10°C. Neglecting the heat taken by
the container, calculate the final temperature of the mixture of water. Specific heat capacity of
water = 4200 J kg^-1K^-1

Exercise - 11 (A) | Q 12 | Page 271

The temperature of 600 g of cold water rises by 15° C when 300 g of hot water at 50° C is added to it. What was the initial temperature of the cold water?

Exercise - 11 (A) | Q 13 | Page 271

1.0 kg of water is container in a 1.25 kW kettle Calculate the time taken for the temperature of water to rise from 25° C to its boiling point 100°C. Specific heat capacity of water =  4.2 J
g^-1K^-1

#### Selina solutions for Concise Physics Class 10 ICSE Chapter 11 Calorimetry Exercise Exercise - 11 (B) [Pages 280 - 281]

Exercise - 11 (B) | Q 1.1 | Page 280

What do you understand by the change of phase of a substance?

Exercise - 11 (B) | Q 1.2 | Page 280

Is there any change in temperature during the change of phase?

Exercise - 11 (B) | Q 1.3 | Page 280

Does the substance absorb or liberate any heat energy during the change of phase?

Exercise - 11 (B) | Q 1.4 | Page 280

what is the name given to the energy absorbed during a phase change?

Exercise - 11 (B) | Q 2.1 | Page 280

A substance changes from its solid state to the liquid state when heat is supplied to it name the process.

Exercise - 11 (B) | Q 2.2 | Page 280

A substance changes from its solid state to the liquid state when heat is supplied to it

What name is given to heat observed by the substance.

Exercise - 11 (B) | Q 2.3 | Page 280

A substance changes from its solid state to the liquid state when heat is supplied to it

How does the average kinetic energy of the molecules of the substance change.

Exercise - 11 (B) | Q 3 | Page 280

A substance undergoes (i) a change in its temperature, (ii) a change in its phase without change in its temperature. In each case, state the change in energy of molecules of the substance.

Exercise - 11 (B) | Q 4.1 | Page 280

How does the average kinetic energy ?

Exercise - 11 (B) | Q 4.2 | Page 280

How does the average potential energy of molecules of a substance change during its change in phase at a constant temperature?

Exercise - 11 (B) | Q 5 | Page 280

State the effect of presence of impurity on the melting point of ice. Give one use of it.

Exercise - 11 (B) | Q 6 | Page 280

State the effect of increase of pressure on the melting point of ice.

Exercise - 11 (B) | Q 7 | Page 280

The diagram in Fig 11.12 below shows the change of phase of a substance on a temperature time graph.

(a) What do the parts AB, BC, CD and DE represent?
(b) what is the melting points of the substance?
(c) what is the boiling points of the substance?

Exercise - 11 (B) | Q 8 | Page 280

1 kg of ice at 0o is heated at constant rate and its temperature is recorded after every 30 s till steam is formed at 100o C. Draw a temperature time graph to represent the change of phase.

Exercise - 11 (B) | Q 9.1 | Page 280

Explain the term boiling ?

Exercise - 11 (B) | Q 9.2 | Page 280

Explain the term boiling point ?

Exercise - 11 (B) | Q 10 | Page 280

How is the volume of water affected when it boils at 100℃?

Exercise - 11 (B) | Q 11 | Page 280

How is the boiling point of water affected when some salt is added to it?

Exercise - 11 (B) | Q 12 | Page 280

What is the effect of increase in pressure on the boiling point of a liquid?

Exercise - 11 (B) | Q 13 | Page 280

Water boils at 120 °C in a pressure cooker. Explain the reason

Exercise - 11 (B) | Q 14 | Page 280

Write down the approximate range of temperature at which water boils in a pressure cooker.

Exercise - 11 (B) | Q 15 | Page 280

It is difficult to cook vegetables on hills and mountains. Explain the reason.

Exercise - 11 (B) | Q 16.1 | Page 280

Complete the following sentence:
When ice melts, its volume _________

Exercise - 11 (B) | Q 16.2 | Page 280

Complete the following sentence:

Decrease in pressure over ice ________ its melting point.

Exercise - 11 (B) | Q 16.3 | Page 280

Complete the following sentence:

Increase in pressure _________ the boiling point of water.

Exercise - 11 (B) | Q 16.4 | Page 280

Complete the following sentence:

A pressure cooker is based on the principle that boiling point of water increases with the _________

Exercise - 11 (B) | Q 16.5 | Page 280

Complete the following sentence :

The boiling point of water is defined as _________

Exercise - 11 (B) | Q 16.6 | Page 280

Complete the following sentence :

water can be made to boil at 115°C by ................. pressure over its surface.

Exercise - 11 (B) | Q 17 | Page 280

What do you understand by the term latent heat?

Exercise - 11 (B) | Q 18 | Page 280

Define the term specific latent heat of fusion of ice state its S.I unit.

Exercise - 11 (B) | Q 19 | Page 280

Write the approximate value of specific latent heat of ice.

Exercise - 11 (B) | Q 20 | Page 280

The specific latent heat of fusion of ice is 336 J g-1. Explain the meaning of its statement.

Exercise - 11 (B) | Q 21 | Page 281

1 g ice of 0℃ melts to form 1 g water at 0℃. State whether the latent heat is absorbed or given out by ice.

Exercise - 11 (B) | Q 22 | Page 281

Which has more heat: 1 g ice at 0℃ or 1g water 0℃? Give reason.

Exercise - 11 (B) | Q 23 | Page 281

(a) Which requires more heat: 1 g ice at 0℃ or 1 g water at 0℃ to raise its temperature to 10℃?

Exercise - 11 (B) | Q 24 | Page 281

Ice cream appears coder to the mouth than water at 0℃. Give reason.

Exercise - 11 (B) | Q 25 | Page 281

Why do bottled soft drinks get cooled, more quickly by the ice cubes than by the iced water, both at 0℃?

Exercise - 11 (B) | Q 26 | Page 281

It is generally cold after a hail-storm then during and before the hail storm. Give reason.

Exercise - 11 (B) | Q 27 | Page 281

The temperature of the surrounding starts falling when ice in a frozen lake starts melting. Give reason.

Exercise - 11 (B) | Q 28 | Page 281

Water in lakes and ponds do not freeze at once in cold countries. Give reason.

Exercise - 11 (B) | Q 29.1 | Page 281

Explain the following:

The surrounding become pleasantly warm when water in a lake starts freezing in cold countries ?

Exercise - 11 (B) | Q 29.2 | Page 281

Explain the following:

The heat supplied to a substance during it change of state, does not cause any rise in its temperature.

#### Selina solutions for Concise Physics Class 10 ICSE Chapter 11 Calorimetry Exercise Exercise - 11 (B) [Page 281]

Exercise - 11 (B) | Q 1 | Page 281

The S.I. unit of specific latent heat is:

• cal g-1

• cal g-1 K-1

• J kg-1

• J kg -1 K-1

Exercise - 11 (B) | Q 2 | Page 281

The specific latent heat of fusion of water is:

• 80 cal g-1

• 2260 J g-1

• 80 J g-1

• 336 J kg-1

#### Selina solutions for Concise Physics Class 10 ICSE Chapter 11 Calorimetry Exercise Exercise - 11 (B) [Pages 281 - 282]

Exercise - 11 (B) | Q 1 | Page 281

10g of ice at 0℃ absorbs 5460 J of heat energy to melt and change to water at 50℃. Calculate the specific latent heat of fusion of ice. Specific heat capacity of water is 4200 J kg^-1 K^-1

Exercise - 11 (B) | Q 2 | Page 281

How much heat energy is released when 5.0 of water at 20℃ changes into ice at 0℃? Take
specific heat capacity of water =4.2 J kg^-1 K^-1, Specific latent heat of fusion of ice 336 J g^-1

Exercise - 11 (B) | Q 3 | Page 281

A molten metal of mass 150 g is kept at its melting point 800℃. When it is allowed to freeze at
the same temperature, it gives out 75,000 J of heat energy.

(a) What is the specific latent heat of the metal?

(b) If the specific heat capacity of metal is 200 J kg^-1 K^-1, how much additional heat energy will
the metal give out in cooling to – 50 ℃?

Exercise - 11 (B) | Q 4 | Page 281

A refrigerator converts 100g of water at 20℃ to ice at – 10℃ in 73.5 min. Calculate the average
the rate of heat extraction in watt. The specific heat capacity of water is 4.2 J kg^-1 K^-1 Specific latent heat of ice is 336 J g-1 and the specific heat capacity of ice if  2.1 J kg^-1 K^-1.

Exercise - 11 (B) | Q 5 | Page 281

In an experiment, 17g of ice is used to bring down the temperature of 40 g of water at 34℃ to its
freezing temperature. The specific heat capacity of water is 4.2 J kg^-1 K^-1. Calculate the specific latent heat of ice. State one important assumption made in the above calculation.

Exercise - 11 (B) | Q 6 | Page 281

Find the result of mixing 10 g of ice at - 10℃ with 10 g of water at 10℃. Specific heat capacity
of ice = 2.1 J kg^-1 K^-1, Specific latent heat of ice = 336 J g^-1 and specific heat capacity of water
= 4.2 J kg^-1 K^-1

Exercise - 11 (B) | Q 7 | Page 281

A piece of ice of mass 40 g is added to 200 g of water at 50℃, Calculate the final temperature of
water when all the ice has melted. Specific heat capacity of water =4200 J kg^-1 K^-1, and specific latent heat of fusion of ice = 336 × 10^3 J kg^-1.

Exercise - 11 (B) | Q 8 | Page 281

250 g of water at 30℃ is contained in a copper vessel of mass 50g. Calculate the mass of ice
required to bring down the temperature of the vessel and its contents to 5℃. Given: specific
latent heat of fusion of ice = 336 xx 10^3J kg^-1, specific heat capacity of copper = 400 J kg^-1 K^-1,
specific heat capacity of water = 4200 J kg^-1 K^-1

Exercise - 11 (B) | Q 9 | Page 282

2 kg of ice melts when water at 100℃ is poured in a hole drilled in a block of ice. What mass of
water was used? Given: Specific heat capacity of water = 4200 J kg^-1 K^-1, Lice = 336×10^3 J kg^-1.

Exercise - 11 (B) | Q 10 | Page 282

Calculate the total amount of heat energy required to convert 100g of ice at −10℃ completely into water at 100℃. Specific heat capacity of ice = 2.1 kg^-1 K^-1, specific heat capacity of water = 4.2 J kg^-1 K^-1, specific latent heat of ice = 336 J g^-1

Q 11 | Page 282

The amount of heat energy required to convert 1 kg of ice at – 10℃ to water at 100℃ is 7,77,000 J. Calculate the specific latent heat of ice. Specific heat capacity if ice = 2100 J kg^-1 K^-1, Specific heat capacity of water = 4200 J kg^-1 K^-1

Exercise - 11 (B) | Q 12 | Page 282

200 g of ice at 0 °C converts into water at 0 °C in 1 minute when heat is supplied to it at a constant rate. In how much time, 200 g of water at 0 °C will change to 20 °C ? Take specific latent heat of ice = 336 J g-1.

## Chapter 11: Calorimetry

Exercise - 11 (A)Exercise - 11 (B)Others

## Selina solutions for Concise Physics Class 10 ICSE chapter 11 - Calorimetry

Selina solutions for Concise Physics Class 10 ICSE chapter 11 (Calorimetry) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CISCE Concise Physics Class 10 ICSE solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Concise Physics Class 10 ICSE chapter 11 Calorimetry are Concept of Calorimetry Numercials:, Concept of Calorimetry, Calorimetry - Specific Heat Capacity, Calorimetry - Principle of Method of Mixtures, Heat - Latent Heat, Heat - Loss and Gain of Heat Involving Change of State for Fusion Only.

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