IGCSE Physics Paper-1: Specimen Questions with Answers 120 - 122 of 149

Question number: 120

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Question

Which change will higher in the pitch of a sound?

Choices

Choice (4)

a.

decreasing its frequency

b.

increasing its amplitude

c.

increasing its frequency

d.

decreasing its amplitude

Answer

c.

Explanation

  • The High frequency will change in the pitch of the sound higher

  • And the low frequency leads to low pitch of the sound.

  • High amplitude will result in the louder of the sound

  • And low amplitude will result quite or softer

The Higher frequency

The Higher Frequency

The Lower frequency

The Lower Frequency

Question number: 121

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Question

In which form the heat engine is converted to?

Choices

Choice (4)

a.

Heat energy to kinetic energy

b.

Heat energy to mechanical energy

c.

Kinetic energy into mechanical energy

d.

mechanical energy to heat energy

Answer

a.

Explanation

  • A heat engine is a device which converts which converts Heat energy to mechanical energy.

  • In this, heat flows from a high temperature to cold temperature.

  • Heat energy is formed when the particles like atoms molecules and ions.

  • It can transfer from one object to another and creates heat.

  • Mechanical energy comprises of both kinetic and potential energy

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)

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

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