Post Utme Obafemi Awolowo University Physics Past Questions and Answers

Question 6:

Which of the following statements is not true?

A. As the slope of an inclined plane increases, the velocity ratio decreases.
B. The efficiency of an inclined plane decreases as the slope increases.
C. The effort required to push a given load up an inclined plane increases as the slope increases
D. The mechanical advantage of smooth inclined plane depends on the ratio of the length to the height of the plane.

Question 7:

The ice and steam points of a thermometer are \(20 mm\) and \(100 mm\) respectively:
A temperature of \(75^{\circ} C\) corresponds to \(Y mm\) on the thermometer. What is \(Y\) ?

A. \(100 mm\)
B. \(70 mm\)
C. \(80 mm\)
D. \(60 mm\)

Question 8:

An electric kettle with negligible heat capacity is rated at \(2000 W\), if \(2.0 kg\) of water is put in it, how long will take the temperature of water to rise from \(20^{\circ} C\) to \(100^{\circ} C\) ? [Specific heat capacity of water
\(\left.=4200 Jkg ^{-1} K ^{-1}\right]\)

A. \(336 s\)
B. \(240 s\)
C. \(168 s\)
D. \(84 s\)

Question 9:

A quantity of ice \(-10^{\circ} C\) is heated until the temperature of the heating vessel is \(90^{\circ} C\). Which of the following constants NOT required to determine the quantity of heat supplied to the vessel?

A. Specific latent heat of vaporization
B. Specific heat capacity of ice
C. Specific latent heat of fusion
D. Specific heat capacity of water

Question 10:

The scent from a jar of perfume opened moves through the air molecules by ____________

A. Evaporation
B. Osmosis
C. Diffusion
D. Convection