IGCSE Physics Paper-1: Specimen Questions with Answers 71 - 74 of 149
Question 71
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
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. |  Loading Image ••• |
b. |  Loading Image ••• |
c. |  Loading Image ••• |
d. |  Loading Image ••• |
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
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
Question
MCQ▾Find movement of air particle as sound wave passes.
Direction of Travel of Sound Wave
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.