IGCSE Physics Paper-1: Specimen Questions with Answers 126 - 128 of 149

Question number: 126

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Question

Which circuit is an open circuit?

Choices

Choice (4)Response

a.

Image of the Circuit -4

Image of the Circuit -4

b.

Image of the Circuit -2

Image of the Circuit -2

c.

Image of the Circuit -3

Image of the Circuit -3

d.

Image of the Circuit -1

Image of the Circuit -1

Answer

a.

Explanation

Image of the Circuit

Image of the Circuit

  • 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.

Question number: 127

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Question

The figure shows two rays from a point P incident on a water surface.

Image of Water surface

Image of Water Surface

Where will be the image formed?

Choices

Choice (4)Response

a.

Image formed part -2

Image Formed Part -2

b.

The Image formed part-1

The Image Formed Part-1

c.

Image formed part -3

Image Formed Part -3

d.

Image formed part -4

Image Formed Part -4

Answer

d.

Explanation

The Image formed

The Image Formed

  • A and B are the incident Rays and when they fall on the surface they reflect back.

  • C and D are the reflected rays.

  • The image will fall where these reflected rays merge.

  • The image is formed as the same size of the object.

Question number: 128

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Question

Which graph shows the Resistance of a filament wire?

Choices

Choice (4)Response

a.

Image Filament wire-2

Image Filament Wire-2

b.

Image Filament wire-4

Image Filament Wire-4

c.

Image Filament wire-3

Image Filament Wire-3

d.

Image Filament wire-1

Image Filament Wire-1

Answer

b.

Explanation

  • The current through a filament lamp is not directly proportional to potential difference (p. d)

  • Because of this the filament gets hot which cause the resistance to increase

  • Filament wire in a bulb gets extremely hot when electric current passes through it and this cause it to glow.

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