CIE Physics Paper-1: Specimen Questions 38 - 40 of 109

Question number: 38

MCQ▾

Question

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

Three children comparing their weights using see-saw

Three children comparing their weights using see-saw

Three children X, Y and Z are comparing their weight using see-saw are shown in figure.

Which of the following is correct order of the children’s weights?

Choices

Choice (4) Response
a.

X>Y>Z

b.

X>Z>Y

c.

Y>X>Z

d.

Y>Z>X

Answer

d.

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 Y>Z>X

Question number: 39

MCQ▾

Question

What is the ratio of the primary turns to the secondary turns for a transformer with input 400000 V and output of 20000 V?

Choices

Choice (4) Response
a.

1: 20

b.

1: 200

c.

20: 1

d.

1: 2

Answer

c.

Explanation

Here Vi=400000V and Vo=20000V are given.

Primary turn = np ,

Secondary turn = ns

The ratio of turns of primary coils and turns of secondary coil is given as,

npns=ViVo

npns=[40000020000]

np:ns=20:1

Question number: 40

MCQ▾

Question

Hydro-electric power station converts which form of energy?

Choices

Choice (4) Response
a.

oil

b.

waves

c.

hot rocks

d.

falling water

Answer

d.

Explanation

The basic principle of hydro-electric is convert kinetic energy to electric energy. And here kinetic energy is obtained from falling water. Thus falling water is the source of energy converted by a hydro-electric power station.

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