IGCSE Physics Paper-1: Specimen Questions with Answers 35 - 37 of 149

Question number: 35

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MCQ▾

Question

Which one of the child has minimum weight?

Three children comparing their weights with see-saw

Three Children Comparing Their Weights with See-Saw

Choices

Choice (4)

a.

Y

b.

Z

c.

X

d.

Question does not provide sufficient data or is vague

Answer

c.

Explanation

Here from given figure one can conclude that

From first figure in weight Y > Z

From second figure Y > X

And from third figure Z > X

So, from all three results one can write

Therefore X has minimum weight.

Question number: 36

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Question

How amount of water becomes half if cold water is put on burner and allowed to remain there for 1 hour?

Choices

Choice (4)

a.

convection

b.

conduction

c.

radiation

d.

evaporation

Answer

d.

Explanation

A tank of cold water put on burner and after 1 hour the volume of water inside the tank is half then its actual volume because of heat half of the liquid molecules of water transformed in to gaseous state. This process is called evaporation.

Question number: 37

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Question

Which radiations are stopped by a plastic?

Choices

Choice (4)

a.

X-rays

b.

β- particles

c.

α- particles

d.

γ- rays

Answer

b.

Explanation

As we know that β- rays are fast moving electrons.

They typically have energies in the range of a few hundred KeV to several MeV.

Since electrons are might lighter than helium atom they are able to penetrate further, through several feet of air but it can be stopped by several millimeter of plastic.

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