Q19 of 20 Page 24

Observe the picture given in Figure 4.8. Water is being boiled in a pan of the wide base.


(i) Which position P or T will feel warmer?


(ii) Fill up the boxes P and T to indicate the mode of flow of heat to the hand.

(i) P will feel warmer as point P will be heated by both convection ( hot air rising up) while point T will be heated by radiation.

(ii) P - Convection


T – Radiation


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At a camp site there are tents of two shades – one made with black fabric and the other with white fabric. Which one will you prefer for resting on a hot summer afternoon? Give a reason for your choice. Would you like to prefer the same tent during winter?

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While constructing a house in a coastal area, in which direction should the windows preferably face and why?

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Look at Figure 4.9. Fig. 4.9


The length of wire PQ in case of A is equal to the diameter of the semicircle formed by the wire CDE, in case B. One pin is attached to each wire with the help of wax as shown in Figure 4.9. Which pin will fall first? Explain.