# IGCSE Physics Paper-1: Specimen Questions with Answers 122 - 125 of 149

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## Question 122

### Question

MCQ▾

The circuit diagram contains a resistor.

What is the resistance of the resistor?

Choice (4)

a.

b.

c.

d.

c.

### Explanation

Resistors are used in circuit to control the potential difference (p. d) .

V = IR

R =

=

The required resistance of the resistor is

## Question 123

### Question

MCQ▾

The diagram shows some liquid in a measuring cylinder. The mass of the liquid is 20 g. 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 = 20 g
• Density = = g/

## Question 124

### Question

MCQ▾

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 125

### Question

MCQ▾

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.

1000 m

b.

3200 m

c.

2300 m

d.

1150 m

d.

### Explanation

• The time taken for echo to be heard t = 10 s
• Seed of sound (u) = 230 m/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 =

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