IGCSE Physics Paper-1: Specimen Questions with Answers 56 - 57 of 149

Question number: 56

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MCQ▾

Question

Which wave cannot travel through a vacuum?

Choices

Choice (4)

a.

Sound waves

b.

X-rays

c.

Microwaves

d.

infra-red radiation

Answer

a.

Explanation

Electromagnetic wave travel through vacuum. So, infra-red, microwaves and X-ray are travel through vacuum.

But sound wave cannot travel through vacuum, because sound waves are travelling vibrations of particles in media such as air water and metal. So it stands to reason that they cannot travel through empty space. Therefore sound wave cannot travel through vacuum.

Question number: 57

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MCQ▾

Question

When will be there a zero reading on voltmeter in this figure below?

Solenoid connected with sensitive voltmeter and a magnet.

Solenoid Connected with Sensitive Voltmeter and a Magnet

Choices

Choice (4)

a.

holding the magnet stationary inside the solenoid

b.

moving the magnet away from the solenoid

c.

moving the magnet towards the solenoid

d.

moving the solenoid towards the magnet

Answer

a.

Explanation

The emf induced only when magnetic flux is changing to the coil. Here if magnet is moving than only voltmeter deflects. But if we keep magnet stationary inside the solenoid the magnetic flux will not change thus voltmeter gives zero reading.

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