# IGCSE Physics Paper-1: Specimen Questions with Answers 29 - 31 of 109

## Question number: 29

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MCQ▾

### Question

Why a person takes time to feel hot if he fills glass beaker with hot water?

### Choices

Choice (4) Response

a.

Glass is a poor conductor of heat.

b.

Water is a good conductor of heat.

c.

Water is a poor conductor of heat.

d.

Glass is a good conductor of heat.

a.

### Explanation

Conductor means is allowed to flow something. We can also say that it allowed to passing something from heat. The water is good conductor of heat but in above case takes several seconds before his hand starts to feel the heat. Because glass is poor conductor of heat, so it takes time to passing the heat of water to his hand.

## Question number: 30

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MCQ▾

### Question

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

### Choices

Choice (4) Response

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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MCQ▾

### 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?

### Choices

Choice (4) Response

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.