# Class 10 FRANK Solutions Physics Chapter 5 - Heat - Exercises and MCQ

Understand heat-related concepts with Frank Solutions for ICSE Class 10 Physics Chapter 5 Heat Exercises and MCQ. Practise Physics numericals based on heat by learning the problem-solving techniques used in our step-wise solutions. Also, practise MCQs with our Frank Solutions.

Why is a steam burn considered worse than a hot water burn? TopperLearning’s Physics experts will guide you with correct scientific reasons for such scenarios. To learn more about heat concepts, utilise our ICSE Class 10 Physics concept videos, practice tests and revision notes.

## Heat - Exercises and MCQ Exercise 245

### Solution 1

^{o}C

(b)2000 / (4 x 3) J/kg

^{o}C

(c)AB and CD

(d)Latent heat is emitted

(e)The first time when temperature is constant represents change of state from solid to liquid and the second time temperature is constant represents change of state from liquid to vapour.

## Heat - Exercises and MCQ Exercise 246

### Solution 2

(a)Heat capacity of a body is the quantity of heat required to raise its temperature by 1^{o}C. It depends upon the mass and the nature of the body.

Units: J/^{o}C or calorie/^{o}C

(b)Change in temperature = (50-30) = 20^{o}C

Amount of heat required, Q = m x C x ?T

= 0.5 x 4200 x 20 = 42000 J

### Solution 3

(a)This means that 390 J of heat is required to raise the temperature of 1kg of copper by 1^{o}C.

(b)Change in temperature = (100-30) = 70^{o}C = 70 K

Amount of heat given out, Q = m x C x T

= 0.6 x 900 x 70 = 37800 J

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## Heat - Exercises and MCQ Exercise 247

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(a) Ice melts under pressure. So, when the steel blades of the skates pressed on the ice, the ice melts. The water formed makes the skates slide easily over the ice, reducing friction. So, when we are skating on ice, we are skating on a thin film of water, which acts like lubricating oil. Nothing such happens in case of glass.

(b) Sand improves the friction between car tyres and the road, so cars don't skid on icy surfaces. Salt is spread so as to decrease the melting point of ice. Ice on the roads melt, making the roads less slippery.

(c) Steam burn is worse than a hot water burn because 1 g of steam gives out 540 calories of additional heat.

(d) Lumps of ice cool better than cold water because each gram of ice requires additional 80 calories of heat to get converted into water. Hence, cooling capacity of lumps of ice is more than cold water.

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## Heat - Exercises and MCQ Exercise 248

### Solution 32

Steam at 100^{o}C will produce more severe burns because every gram of steam gives out 2260 J of heat energy while condensing. This much amount of heat is additional to the heat contained in one gram of boiling water.

### Solution 33

Ice cream appears colder to mouth than water at 0^{o}C because it can extract approximately 80 cal/g (latent heat of fusion of ice)more heat from as compared to water at 0 ^{o}C.

### Solution 34

^{o}C. Hence, the cooling capacity of ice cubes is more than that of iced water.

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1 gram of ice at 0^{o}C requires 80 calories of heat to get converted into 1 gram of water at 0^{o}C. So, water has more heat.

### Solution 38

1 gram of water at 100^{o}C requires 540 calories of heat to get converted into 1 gram of steam at 100^{o}C. So, steam has more heat.

### Solution 39

1 gram of ice at 0^{o}C requires additional 80 calories of heat to get converted into water at 0^{o}C. Then, heat is provided to raise the temperature to 10^{o}C. Therefore, ice requires more heat than water and the additional heat is known as 'Latent heat of fusion of ice'.

### Solution 40

^{o}C.