Physics Past Questions and Answers

If the fraction of the atoms of a radioactive material left after 120years is \(\frac{1}{64}\), what is the half-life of the material? \(\frac{1}{64}\)

A 20 years
B 10 years
C 2 years
D 24 years

Question 2027:

In the diagram shown, which of the simple pendulum will resonate with P when set into oscillation?

A U
B T
C R and T
D Q and R

Question 2028:

The time rate of loss of heat by a body is proportional to the

A Temperature of its surroundings
B Temperature of the body
C Difference in temperature between the body and its surroundings
D Ratio of the temperature of the body to that of its surroundings

Question 2029:

A positively charged rod X is brought near an uncharged metal sphere Y and is then touched by a finger with X still in place. When the finger is removed, the result is that Y has

A No charge and a zero potential
B A positive charge and a zero potential
C A negative charge and a positive potential
D A negative charge and a negative potential

Question 2030:

Electrical appliances in homes are normally earthed so that

A A person touching the appliances is safe from electric shock
B Both the a.c. and d.c. sources can be used
C The appliances are maintained at a higher pd than the earth
D The appliances are maintained at a lower pd than the earth