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11. Stainless steel pans are usually provided with copper bottoms. The reason for this could be that

(a) copper bottom makes the pan more durable.

(b) such pans appear colourful.

(c) copper is a better conductor of heat than stainless steel.

(d) copper is easier to clean than stainless steel.

 

Stainless steel pans are usually provided with copper bottoms. The reason for this could be that 

(c) copper is a better conductor of heat than stainless steel.

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Posted by

Riya

10. A wooden spoon is dipped in a cup of ice cream. Its other end

(a) becomes cold by the process of conduction.

(b) becomes cold by the process of convection.

(c) becomes cold by the process of radiation.

(d) does not become cold.

Does not become cold

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Posted by

Saim

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9. An iron ball at 40°C is dropped in a mug containing water at 40°C. The heat will

(a) flow from the iron ball to water.

(b) not flow from iron ball to water or from water to iron ball.

(c) flow from water to iron ball.

(d) increase the temperature of both.

If an iron ball   40\degree C  is dropped in a mug containing water 40\degree C.  Then, the heat will

(b) not flow from iron ball to water or from water to iron ball.

Because heat will flow from an object with a high temperature to an object with a low temperature.  But here, the temperature of both liquid and iron balls are the same.
Therefore, no flow of heat takes place.  

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Posted by

Riya

8. One litre of water at 30°C is mixed with one litre of water at 50°C. The temperature of the mixture will be

(a) 80°C

(b) more than 50°C but less than 80°C

(c) 20°C

(d) between 30°C and 50°C

If one litre of water  30\degree C is mixed with one litre of water at 50\degree C. Then, the temperature of the mixture will be

(d) between 30\degree C and  50\degree C

Because the volume of both the liquids with temperature  30\degree C   50\degree C is equal. Therefore, when we add both theories, there is a transfer of heat that takes place from a liquid with a high temperature to a liquid with a low temperature. That's why the temperature is between 30\degree C and  50\degree C 

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Posted by

Riya

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7. In places of hot climate it is advised that the outer walls of houses be painted white. Explain.

In places of hot climate it is advised that the outer walls of houses be painted white because white is a light colour and because of that it reflects back most of the heat that falls on it and a very less amount of heat is absorbed by the walls.

Therefore, a light colour tends to keep the house cool

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Posted by

Rehan

Look at Fig. 4.13. Mark where the heat is being transferred by conduction, by convection and by radiation.

Three stages are:-

i)  Transfer of heat from the burner to the pan takes place through radiation.

ii) Transfer of heat from the pan to water takes place through conduction.

iii) Transfer of heat within the water takes place through convection.

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Posted by

Riya

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5. Why does wearing more layers of clothing during winter keep us warmer than wearing just one thick piece of clothing?

we wear more thin layers of clothing instead of 1 thick layer as many layers trap air inside them. we know air is a bad conductor so it prevent heat loss

 

 

 

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Posted by

kartik

4. Match the following :

(i) Land breeze blows during                                  (a) summer

(ii) Sea breeze blows during                                   (b) winter

(iii) Dark-coloured clothes are preferred during      (c) day

(iv) Light-coloured clothes are preferred during      (d) night

These are the correct match.

i)  Land breeze blows during \rightarrow  (d) night

ii) Sea breeze blows during  \rightarrow  (c) day

iii) Dark-coloured clothes are preferred during  \rightarrow   (b) winter

iv) Light-coloured clothes are preferred during  \rightarrow   (a) summer

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Posted by

Riya

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3. Fill in the blanks :

(a) The hotness of an object is determined by its __________.

(b) Temperature of boiling water cannot be measured by a _____________ thermometer.

(c) Temperature is measured in degree ______________.

(d) No medium is required for the transfer of heat by the process of __________.

(e) A cold steel spoon is dipped in a cup of hot milk. Heat is transferred to its other end by the process of ______________.

(f ) Clothes of ______________ colours absorb more heat better than clothes of light colours.

a)   The hotness of an object is determined by its temperature.

b) The temperature of boiling water cannot be measured by a clinical thermometer.

c)  Temperature is measured in degrees Celsius.

d)  No medium is required for the transfer of heat by the process of radiation.

e)   A cold steel spoon is dipped in a cup of hot milk. Heat is transferred to its other end by the process of conduction.

f)  Clothes of dark colours absorb more heat better than clothes of light colours.

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Posted by

Riya

2. Give two examples each of conductors and insulators of heat.

Two examples of

i) Conductor:- 
1) Copper
2) Aluminium

ii) insulator:-
1) Plastic 
2)  Wood

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Posted by

Riya

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