IGCSE Physics Paper-1: Specimen Questions with Answers 98 - 100 of 149

Question number: 98

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MCQ▾

Question

A polythene rod repels an inflated balloon hanging from a nylon thread. What charges must the rod and the balloon carry?

Choices

Choice (4)

a.

The rod is charged but the balloon is not.

b.

The balloon is charged but the rod is not.

c.

The rod and the balloon carry opposite charges.

d.

The rod and the balloon carry like charges.

Answer

d.

Explanation

The like charges always repel and the opposite charges always attract to each other.

Here a polythene rod repels an inflated balloon hanging from a nylon thread. Therefore rod and balloon carry like charges.

Question number: 99

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Question

The circuit shown contains four lamps and three switches.

Circuit diagram consist of three switches and four lamps.

Circuit Diagram Consist of Three Switches and Four Lamps

Which switches must be closed to light only lamps 1 and 3?

Choices

Choice (4)

a.

switch S2 and switch S3 only

b.

switch S1 and switch S3 only

c.

switch S1 only

d.

switch S1 and switch S2 only

Answer

c.

Explanation

For light only lamp 1 and 3 switch S1 must be closed. As figure shows only switch S1 is must be close for completing the circuit for lamp 1 and lamp 3.

Question number: 100

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Question

A straight wire carrying a current produces a magnetic field. Which diagram shows the correct shape of the field?

Choices

Choice (4)

a.

A current carrying wire passing through plane. (Choice a)

b.

A current carrying wire passing through plane. (Choice b)

c.

A current carrying wire passing through plane. (Choice c)

d.

A current carrying wire passing through plane. (Choice d)

Answer

d.

Explanation

Magnetic field lines due to straight wire carrying current is always circular and the direction of the magnetic field line is given by right hand rules which is explained as follow,

Right hand rules for current carrying wire and magnetic field

Right Hand Rules for Current Carrying Wire and Magnetic Field

The direction of the magnetic field is perpendicular to the wire and is in the direction the fingers of your right hand would curl if you wrapped them around the wire with your thumb in the direction of the current.

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