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

## Question 98

### Question

MCQ▾

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.

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 99

### Question

MCQ▾

The circuit shown contains four lamps and three switches.

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

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 100

### Question

MCQ▾

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

Choice (4)

a.

b.

c.

d.