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

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

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

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

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.

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

Answer

b.

Explanation

Here from given data

Formula of half-life is given as,