Post Utme University of Port Harcourt Physics Past Questions and Answers

Question 11:

A solid weighs \(4.8 \mathrm{~g}\) in air, \(2.8 \mathrm{~g}\) in water and \(3.2 \mathrm{~g}\) in kerosene. The ratio of density of the solid to that of the kerosene is ____________

A. 12
B. 3
C. 2
D. \(3 / 2\)
E. \(5 / 4\)

Question 12:

The extension in spring when \(5 \mathrm{~g}\) weight was hung from it was \(0,56 \mathrm{~cm}\). if Hooke's law is obeyed, what is the extension caused by a load of \(20 \mathrm{~g}\) weight?

A. \(1.12 \mathrm{~cm}\)
B. \(2.14 \mathrm{~cm}\)
C. \(2.52 \mathrm{~cm}\)
D. \(2.80 \mathrm{~cm}\)
E. \(2.24 \mathrm{~cm}\)

Question 13:

The ice and steam points of a mercury-in-glass thermometer of centigrade scale and of uniform bore correspond respectively to \(3 \mathrm{~cm}\) and 19 em lengths of the mercury thread. When the thread is \(12 \mathrm{~cm}\), the temperature is ____________

A. \(32^{\circ} \mathrm{C}\)
B. \(48^{\circ} \mathrm{C}\)
C. \(56^{\circ} \mathrm{C}\)
D. \(65^{\circ} \mathrm{C}\)
E. \(75^{\circ} \mathrm{C}\)

Question 14:

An electric cell has an internal resistance of 2 ohms, a current of \(0.5 \mathrm{~A}\) is found to flow when \(a\) resistor of 5 ohms resistance is connected across it. What is the electromotive force of the cell?

A. 5 volts
B. \(3.5\) volts
C. \(2.5\) volts
D. 1 volt
E. 10 volts

Question 15:

A uniform beam HK of length \(10 \mathrm{~m}\) and weighing \(200 \mathrm{~N}\) is supported at both ends. A man weighing, \(100 \mathrm{~N}\) stands at a point \(P\) on the beam. if the reactions at \(\mathrm{H}\) and \(\mathrm{K}\) are respectively \(800 \mathrm{~N}\) and \(400 \mathrm{~N}\), then the distance HP is ____________

A. \(4 \mathrm{~m}\)
B. \(3 \frac{1}{3} \mathrm{~m}\)
C. \(3 m\)
D. \(6 \frac{2}{3} \mathrm{~m}\)
E. \(7 \mathrm{~m}\)