IGCSE Physics Paper-1: Specimen Questions with Answers 71 - 74 of 149

Question 71

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Question

MCQ▾

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

Choices

Choice (4)

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 72

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Question

MCQ▾

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

Choices

Choice (4)

a.

A Graph of current versus potential difference
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b.

Graph of current versus potential difference given.
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c.

Graph of current versus potential differences.
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d.

Graph of current versus potential difference
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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 73

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Question

MCQ▾

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)

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,

Question 74

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Question

MCQ▾

Find movement of air particle as sound wave passes.

Direction of travel of sound wave

Direction of Travel of Sound Wave

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Choices

Choice (4)

a.

moves to the right and stays there ( )

b.

moves up and stays there ( )

c.

moves up and down ( )

d.

moves left and right ( )

Answer

d.

Explanation

Sound wave is move in the air towards right and due to effect of sound waves particle of air also moves to the right and because of reflection of it, it moves in opposite direction. So, one can say that particle of air move left and right.

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