IGCSE Physics Paper-1: Specimen Questions with Answers 75 - 77 of 149

Question number: 75

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Question

How heat moves through water in a heater used to heat a tank of cold water?

Heater used to heat a tank of cold water

Heater Used to Heat a Tank of Cold Water

Choices

Choice (4)

a.

conduction

b.

evaporation

c.

radiation

d.

convection

Answer

a.

Explanation

In heater used to heat a tank of cold water, as switch is start, rod is going to heat. Because of electric energy is converted in to heat energy. And water molecules near heater absorb heat and pass to other molecules of water. Thus from road to water conduction process is occur.

Question number: 76

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Question

Find order of weight of 3 children on the see saw.

See-saw on which children X, Y and Z are playing.

See-Saw on Which Children X, Y and Z Are Playing

Choices

Choice (4)

a.

b.

c.

d.

Answer

d.

Explanation

Here from given figure one can conclude that

From first figure in weight Y > X

From second figure Y > Z

And from third figure X > Z

So from all three results one can write

Question number: 77

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Question

What would be the best unit to measure this?

Figure of measuring cylinder

Figure of Measuring Cylinder

Choices

Choice (4)

a.

mm2

b.

cm2

c.

mm3

d.

cm3

Answer

c.

Explanation

The given figure shows the measuring cylinder which measure volume of the liquid. And the scale shown in figure is in mm, so volume of liquid measure by this cylinder is in mm3

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