IGCSE Physics Paper-1: Specimen Questions with Answers 78 - 80 of 149

Question number: 78

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Question

A radio broadcasting shows 200 m. What does 200 m stand for?

Choices

Choice (4)

a.

its speed

b.

its wavelength

c.

its frequency

d.

its amplitude

Answer

b.

Explanation

Here a woman turns her radio to a station broadcasting on 200 m.

Frequency means one complete revolution per unit time and unit of frequency is Hz or 1/s, amplitude is unit less and unit of speed is m/s.

Only unit of wavelength is meter. Thus woman turns wavelength of station.

Question number: 79

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Question

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

A student stops the air coming in bicycle pump

A Student Stops the Air Coming in Bicycle Pump

What happens to the pressure and to the volume of the trapped air as the pump handle is pulled in?

Choices

Choice (4)

a.

Pressure increases, volume remains the same

b.

Pressure increases, volume decreases

c.

Pressure decreases, volume remains the same

d.

Pressure decreases, volume decreases

Answer

d.

Explanation

As we remove pressure then volume is expand

In above case if pump handle is pulled then pressure is relish. So, pressure is decrease and volume is increase.

Question number: 80

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Question

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

Choices

Choice (4)

a.

Infra-red waves have the greatest speed.

b.

Ultra-violet waves have the greatest speed.

c.

All electromagnetic waves have the same speed.

d.

Visible light waves have the greatest speed.

Answer

c.

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.

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