| A | B |
|---|
| Its temperature range is 35-42 degree Celcius. Water boils at 100 degrees celcius. | Why can't we use the clinical ther mometer to measure temperature of boiling water? |
| It expands less on heating so it will not crack. | Why do we use pyrex instead of ordinary glass in cooking utensils? |
| Air will cool faster due to convection currents produced when cold air at the top of the room sinks and hot air rises. | Why are air-cons usually placed at the top of the room? |
| It is a poorer absorber of heat so heat gain by radiation is reduced. | Why do people prefer to wear light-coloured clothings in hot weather? |
| The uneven expansion (brass expands more than iron) of the two metal during heating causes the strip to bend inwards on the side of the iron. | Why does a bimetallic strip made of brass and iron bend when heated? |
| So that the thermos flask can reduce heat transfer by radiation. | Why is the double glass wall in the thermos flask painted silver? |
| So that the thermos flask can reduce heat transfer by conduction and convection. | Why is there an are of vacuum in the thermos flask? |
| So that the thermos flask can reduce heat transfer by convection? | Why should we put a stopper at the top of the thermos flask? |
