IGCSE Physics Paper-1: Specimen Questions with Answers 46 - 48 of 109

Question number: 46

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Question

Find 2 faulty ammeters, if there are 2 faulty ammeters and 2 perfect ammeters in series.

Circuit diagram of two faulty and two perfect ammeters.

Circuit Diagram of Two Faulty and Two Perfect Ammeters.

In figure two faulty and two perfect ammeters are connected in series with a resistance box and a battery.

The readings on the ammeters are

The readings on the ammeters are

In given table of readings on the ammeters are

A1

2.9A

A2

3.1A

A3

3.1A

A4

3.3A

Choices

Choice (4) Response

a.

A1 and A2

b.

A1 and A4

c.

A2 and A3

d.

A3 and A4

Answer

b.

Explanation

Here in given circuit diagram four ammeters are connected in series. In series same current passes through all elements which are connected in series. Therefore same current passing through all the ammeters, thus same reading should be indicated. But from given data A1 and A4 gave different readings from A2 and A3. So A1 and A4 are the faulty ammeter.

Question number: 47

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Question

How we find temperature?

Choices

Choice (4) Response

a.

Thermometer

b.

a force meter

c.

micrometer screw gauge

d.

a balance and a ruler

Answer

a.

Explanation

A balance and a ruler is used to measure mass and length respectively.

Force meter is used to measure force. And screw gauge used to measure small length in range of micro

Therefore Thermometer is used to measure the temperature.

Question number: 48

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Question

Which switches must be closed to light both lamps based on the circuit diagram?

Circuit diagram consists of two bulbs and three switches.

Circuit Diagram Consists of Two Bulbs and Three Switches.

two bulbs and three switches are connected with battery as shown in figure.

Choices

Choice (4) Response

a.

1 and 3

b.

1 and 2

c.

2 and 3

d.

1,2 and 3

Answer

a.

Explanation

Here for two bulbs and three switches are connected as shown in figure. For lighting the bulb circuit should be closed for both the bulb. Therefore from figure switch 1 is connected to 1st bulb so it must be closed and switch 3 is connected to 2nd bulb so it also must be closed for passing the current through both the bulbs.