IGCSE Physics Paper-1: Specimen Questions with Answers 38 - 40 of 149

Question number: 38

Edit

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

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

Choices

Choice (4)

a.

b.

c.

d.

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

Question number: 39

Edit

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)

a.

20: 1

b.

1: 20

c.

1: 200

d.

1: 2

Answer

a.

Explanation

Here and are given.

Primary turn = ,

Secondary turn =

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

Question number: 40

Edit

MCQ▾

Question

Hydro-electric power station converts which form of energy?

Choices

Choice (4)

a.

falling water

b.

oil

c.

hot rocks

d.

waves

Answer

a.

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.

Choose Paper