# IGCSE Physics Paper-1: Specimen Questions with Answers 30 - 32 of 149

## Question number: 30

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### Question

Consider sound travels at 340m/s. Find time between shouting of the boy at cliff 500 m away and hearing back his echo.

Choice (4)

a.

b.

c.

d.

b.

### Explanation

Distance between boy and cliff is 500 m, and he shouted for help but its voice back as echo. So distance travel by voice is 2 ⨯ 500

And the sound travels with speed 340 m/s

## Question number: 31

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### Question

A glass tank contains some water. If length QR and the width RS of the tank are known. What other distance must be known to calculate the volume of the water?

Choice (4)

a.

ST

b.

TU

c.

TV

d.

SV

a.

### Explanation

Here in given figure, water inside the glass tank filled till height ST.

Now, to find the volume we must know about Length, breath and height.

Here length and width QR and RS is given respectively.

And height is ST = RU

Here only ST is unknown

So, we need ST distance.

## Question number: 32

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### Question

4 divers are there, 2 in sea water and 2 in fresh water. Which diver will face greatest pressure known that sea water is denser than fresh water?

Choice (4)

a.

D

b.

A

c.

B

d.

C

c.

### Explanation

Pressure in liquid we can define as

Where ρ = Density of liquid

g = Gravitational acceleration

h = Height above the point at which we measure the pressure

In this case density of sea water is denser fresh water and height of diver B is more.

Thus on diver B is there the greatest pressure.