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The activity of a radioactive substance depends on

a.

Temperature and purity

b.

Purity and age

c.

Temperature and age

d.

Age, purity and temperature

In which of the following media is speed of sound least?

a.

Air

b.

Brass

c.

Water

d.

Wood

The main purpose of the transformer in an A.C. radio set is to

a.

increase the power to the radio

b.

convert energy from A.C to D.C.

c.

step up the voltage

d.

step down the voltage

A concave mirror has a radius of curvature of 36cm. At what distance from the mirror should an object be placed to give a real image three times the size of the
object?

a.

12cm

b.

24cm

c.

48cm

d.

108cm

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