# CIE Physics Paper-1: Specimen Questions 80 - 82 of 109

## Question number: 80

MCQ▾

### Question

Find correct statement about speed of electromagnetic waves in a vacuum.

### Choices

Choice (4) Response
a.

All electromagnetic waves have the same speed.

b.

Infra-red waves have the greatest speed.

c.

Ultra-violet waves have the greatest speed.

d.

Visible light waves have the greatest speed.

a.

### Explanation

Speed of the all electromagnetic waves in a vacuum is same. Because speed of electromagnetic waves are not depending upon wavelength. And there is no electric and magnetic effect present in vacuum.

## Question number: 81

MCQ▾

### Question

Find time between shouting and hearing the echo if boy is on an island 300 m away and shouts for help. He hears reply as echo from some cliffs. Consider sound travels at 200 m/s through the air.

### Choices

Choice (4) Response
a.

b.

c.

d.

a.

### Explanation

Distance between boy and cliff is 300 m, and he shouted for help but its voice back as echo. So distance travel by voice is 2 ⨯ 300

And the sound travels with speed 200 m/s

## Question number: 82

MCQ▾

### Question

Thumb is placed on bicycle outlet. If air is pushed in what change will occur to pressure and volume?

### Choices

Choice (4) Response
a.

Pressure increases, volume remains the same

b.

Pressure decreases, volume decreases

c.

Pressure increases, volume decreases

d.

Pressure decreases, volume remains the same