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

Question number: 122

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Question

The circuit diagram contains a resistor.

Image of Contains a resistor

Image of Contains a Resistor

What is the resistance of the resistor?

Choices

Choice (4)Response

a.

b.

c.

d.

Answer

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 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?

Image of the Cylinder

Image of the Cylinder

Choices

Choice (4)Response

a.

b.

1 g/

c.

g/

d.

Answer

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?

Choices

Choice (4)Response

a.

Meters

b.

Hertz

c.

Ampere

d.

Pascal

Answer

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?

The Clapped his hands

The Clapped His Hands

Choices

Choice (4)Response

a.

1000m

b.

3200m

c.

2300m

d.

1150m

Answer

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 =

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