IGCSE Physics Paper-1: Specimen Questions with Answers 54 - 56 of 109

Question number: 54

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Question

Cotton is measured between two points on a scale. This cotton is rolled around a pen 6 times. Find the length of each roll?

A piece of cotton is measured by a ruler

A Piece of Cotton is Measured by a Ruler

In figure a piece of cotton is measured by a ruler is shown.

Cotton is wounded around a pen

Cotton is Wounded Around a Pen

Figure shows six turns of cotton are wounded around a pen.

Choices

Choice (4) Response

a.

13.2cm

b.

15.6 cm

c.

2.6cm

d.

2.2cm

Answer

d.

Explanation

From first given figure the length of the cotton is measured as,

Now, length of the cotton is wound closely around a pen, and it goes six rounds. So, distance of one round is given as,

Question number: 55

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Question

Calculate average speed of the car, if rad length is 5000 m and car takes 2 minutes to cover it across 2 end points.

Choices

Choice (4) Response

a.

1000 km/h

b.

3.0 km/h

c.

2.5 km/h

d.

150 km/h

Answer

c.

Explanation

Here to find the average speed we can use the formula for this is given as,

Here we have distance is 5000 m Then we can write 5 km.

Question number: 56

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Question

Which wave cannot travel through a vacuum?

Choices

Choice (4) Response

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.