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

## Question 74

### Question

MCQ▾

Find movement of air particle as sound wave passes.

### Choices

Choice (4)

a.

moves to the right and stays there ()

b.

moves up and stays there ()

c.

moves up and down ()

d.

moves left and right ()

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.

## Question 75

### Question

MCQ▾

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

Choice (4)

a.

conduction

b.

evaporation

c.

d.

convection

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.

## Question 76

### Question

MCQ▾

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

Choice (4)

a.

b.

c.

d.

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