Post Utme Physics Past Questions and Answers

Question 191:

The difference between X-rays and \(\mathrm{y}\)-rays is that ____________

A. X-rays arise from energy changes and are due to electrons while \(Y\)-rays come from the nucleus
B. X-rays are electromagnetic radiations while \(Y\)-rays are not
C. X-rays have higher frequencies than \(\mathrm{y}\)-rays
D. X-rays are more penetrating than \(\mathrm{Y}\)-rays

Question 192:

When an atom loses or gains a charge, it becomes ____________

A. An electron
B. An ion
C. A neutron
D. A proton

Question 193:

Which of the following statements is true of the period of a simple pendulum?

A. It depends on the mass of the bob and the acceleration due to gravity
B. It depends on the length of the string and the acceleration due to gravity
C. It depends on the mass of the bob and the length of the string
D. It depends on the mass of the bob, the length of the string and acceleration due to gravity

Question 194:

A boat travels due east with a speed of \(40 \mathrm{~ms}^{-1}\) across a river flowing due south at \(30 \mathrm{~ms}^{-1}\).

Calculate the resultant speed of the boat.

A. \(1.3 \mathrm{~ms}^{-1}\)
B. \(10.0 \mathrm{~ms}^{-1}\)
C. \(50.0 \mathrm{~ms}^{-1}\)
D. \(70.0 \mathrm{~ms}^{-1}\)

Question 195:

The atmospheric pressure due to water is \(1.3 \times 10^{6} \mathrm{Nm}^{-2}\).
What is the total pressure at the bottom of an ocean \(10 \mathrm{~m}\) deep?
(Density of water \(=1000 \mathrm{kgm}^{-3}\) and \(\left.\mathrm{g}=10 \mathrm{~ms}^{-2} \right)\)

A. \(1.3 \times 10^{7} \mathrm{Nm}^{-2}\)
B. \(1.4 \times 10^{6} \mathrm{Nm}^{-2}\)
C. \(1.4 \times 10^{4} \mathrm{Nm}^{-2}\)
D. \(1.0 \times 10^{5} \mathrm{Nm}^{-2}\)