IGCSE Physics Paper-1: Specimen Questions with Answers 74 - 76 of 149

Find movement of air particle as sound wave passes.

Answer

d.

Explanation

Sound wave is move in the air towards right and due to effect of sound waves particle of air also moves to the right and because of reflection of it, it moves in opposite direction. So, one can say that particle of air move left and right.

How heat moves through water in a heater used to heat a tank of cold water?

Answer

a.

Explanation

In heater used to heat a tank of cold water, as switch is start, rod is going to heat. Because of electric energy is converted in to heat energy. And water molecules near heater absorb heat and pass to other molecules of water. Thus from road to water conduction process is occur.

Find order of weight of 3 children on the see saw.

Answer

d.

Explanation

Here from given figure one can conclude that

From first figure in weight Y > X

From second figure Y > Z

And from third figure X > Z

So from all three results one can write