Q5 of 16 Page 45

Discuss why wearing more layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing?

Wearing more layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing because air gets trapped in between the layers of the clothes and air, being a bad conductor of heat, doesn’t allow heat to pass through them and heat is retained within the layers keeping the clothes warm.


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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 _______ thermometer.


c. Temperature is measured in degree ______.


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


e. A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the process of _______.


f. Clothes of ______ colours absorb heat better than clothes of light colours.

 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

 

 6

Look at Fig. 4.13. Mark where the heat is being transferred by

conduction, by convection and by radiation.


 7

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