IGCSE Physics Paper-1: Specimen Questions with Answers 71 - 73 of 149

Question number: 71

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Question

A man tunes his radio from 10 to 60. What does the 60 explain?

Choices

Choice (4)Response

a.

its speed

b.

its amplitude

c.

its wavelength

d.

its frequency

Answer

b.

Explanation

Here man turns his radio from 10 to 60.

Unit of frequency is Hz or 1/s, unit of speed is and unit of wavelength is meter.

Only amplitude is unit less. So man turns amplitude of radio

Question number: 72

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Question

Explain graph between potential difference and current, known that potential difference changes with changes in current through the wire.

Choices

Choice (4)Response

a.

A Graph of current versus potential difference

A Graph of Current Versus Potential Difference

b.

Graph of current versus potential difference given.

Graph of Current Versus Potential Difference Given.

c.

Graph of current versus potential differences.

Graph of Current Versus Potential Differences.

d.

Graph of current versus potential difference

Graph of Current Versus Potential Difference

Answer

d.

Explanation

From Ohm’s Law graph of current vs potential difference is always straight line passing throw origin.

If p. d is zero, current will also zero.

Question number: 73

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Question

Find the amount of sample left after 20 hours if the half-life is 5 hours and has 0.48g of the substance.

Choices

Choice (4)Response

a.

1.92 g

b.

7.68 g

c.

0.03 g

d.

0.12 g

Answer

b.

Explanation

Here from given data

Formula of half-life is given as,

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