The activity of a radioactive substance depends on
Temperature and purity
Purity and age
Temperature and age
Age, purity and temperature
In which of the following media is speed of sound least?
Air
Brass
Water
Wood
The main purpose of the transformer in an A.C. radio set is to
increase the power to the radio
convert energy from A.C to D.C.
step up the voltage
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 theobject?
12cm
24cm
48cm
108cm
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