# IGCSE Physics Paper-1: Specimen Questions with Answers 123 - 126 of 149

## Question number: 123

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### Question

The diagram shows some liquid in a measuring cylinder. The mass of the liquid is 20g. What is density of the liquid?

Choice (4)

a.

b.

1 g/

c.

g/

d.

c.

### Explanation

• Density =

• From the diagram the volume of the liquid is

• Mass of the liquid = 20g

• Density = = g/

## Question number: 124

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### Question

Which of the following is a S. I unit of pressure?

Choice (4)

a.

Meters

b.

Hertz

c.

Ampere

d.

Pascal

a.

### Explanation

• The S. I unit for pressure is Pascal (pa) which is equal to the N/m2

• Hertz is the unit of Frequency

• Ampere is a unit of current.

• Meters are the units of measurements.

## Question number: 125

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### Question

A person clapped his hands near a building and heard echo after 10s. What is the distance of the building from the person if the speed of the sound is taken as 230 m/s?

Choice (4)

a.

1000m

b.

3200m

c.

2300m

d.

1150m

d.

### Explanation

• The time taken for echo to be heard t = 10s

• Seed of sound (u) = 230m/s

• Distance travelled by the sound (d)

• d is the distance between person to building and building to the person.

• Distance of the building to the person =

## Question number: 126

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MCQ▾

### Question

Which circuit is an open circuit?

Choice (4)

a.

b.

c.

d.

a.

### Explanation

• The electric circuit must be closed to pass the electricity through it.

• In the above circuit D the switch is opened.

• It means it the circuit is disconnected;

• There would no current will passes through it.