IGCSE Physics Paper-1: Specimen Questions with Answers 25 - 26 of 149

Question 25

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Question

MCQ▾

If light enters glass, find angle of incidence ad refraction in the diagram below.

Figure of light entering a blocks of glass

Figure of Light Entering a Blocks of Glass

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Choices

Choice (4)
a.Angle of incident – 1, Angle of refraction – 3
b.Angle of incident – 2, Angle of refraction – 4
c.Angle of incident – 1, Angle of refraction – 4
d.Angle of incident – 2, Angle of refraction – 3

Answer

b.

Explanation

Angle of incidence is a measure of deviation of something from “straight on”.

The angle of incidence is the angle between ray incidents on a surface and the line perpendicular to the surface at the point of incident called the normal.

Therefore angle 2 is incident angle.

Similarly, the angle between the reflected ray and the normal is known as the angle of reflection.

Therefore, angle 4 is angle of refraction

Question 26

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Question

MCQ▾

4 divers are there, 2 in sea water and 2 in fresh water. Which diver will face lowest pressure known that sea water is denser than fresh water?

Divers are swimming in sea water and Fresh water.

Divers Are Swimming in Sea Water and Fresh Water

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Choices

Choice (4)
a.D
b.C
c.A
d.B

Answer

b.

Explanation

Pressure in liquid we can define as

Where ρ = Density of liquid

g = Gravitational acceleration

h = Height above the point at which we measure the pressure

In this case density of fresh water is rarer than the sea water and height of diver C is less.

Thus on diver C is there the lowest pressure.

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