Jamb Physics 2018 Past Questions and Answers

Question 26:

• JAMB 2018

In a series R-L-C circuit at resonance, the voltages across the resistor and the inductor are 30V and 40V respectively. What is the voltage across the capacitor?

A. 30V
B. 70V
C. 50V
D. 40V

Question 27:

• JAMB 2018

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 28:

• JAMB 2018

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 29:

• JAMB 2018

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 30:

• JAMB 2018

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