IGCSE Physics Paper-1: Specimen Questions with Answers 104 - 105 of 149

Question number: 104

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Question

Which statement is correct?

Choices

Choice (4)Response

a.

An earth wire is needed to prevent the fuse blowing.

b.

A fuse is included in a circuit to prevent the current becoming too high.

c.

A fuse should be connected to the neutral wire in a plug.

d.

An electric circuit will only work if it includes a fuse.

Answer

b.

Explanation

Fuse is made up of small wire of law melting point material. High current is damage the electric component (like bulb). As high current passes through fuse due to heat the fuse wire will melt and connection will open. So if we connect fuse in series in circuit, it prevent the circuit from high current.

Question number: 105

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Question

For measuring potential difference across the cell, which one is the correct connection for the voltmeter?

Choices

Choice (4)Response

a.

Circuit diagram to measure p.d. (choice A)

Circuit Diagram to Measure P. D. (Choice A)

b.

Circuit diagram to measure p.d. (choice B)

Circuit Diagram to Measure P. D. (Choice B)

c.

Circuit diagram to measure p.d. (choice C)

Circuit Diagram to Measure P. D. (Choice C)

d.

Circuit diagram to measure p.d. (choice D)

Circuit Diagram to Measure P. D. (Choice D)

Answer

a.

Explanation

The potential difference between two points is always measured across (parallel to) the points. So, for measure the potential difference across the cell, voltmeter should be connected in parallel position to the cell. So choice A is right.

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