Post Utme Physics Past Questions and Answers

Question 196:

Which of the f011owing conditions will make water boil at a temperature of \(100^{\circ} \mathrm{C}\) and saturation vapour pressure of \(750 \mathrm{mmHg}\) ?

A. Decrease the external pressure
B. Heat more rapidly at the same pressure
C. Increase the external pressure
D. Reduce the quantity of water

Question 197:

The density of a fixed mass of gas at constant pressure is ____________

A. Constant with temperature
B. Directly proportional to the temperature
C. Inversely proportional to the temperature
D. Directly proportional to its volume

Question 198:

Which of the following equations is incoorrect about an ideal gas (all the symbols have their usual meanings)

A. \(P V=n R T\)
B. \(\frac{\mathrm{PV}}{\mathrm{T}}=\) constant
C. \(\frac{\mathrm{PV}}{3 / 2^{\mathrm{nRT}}}\)
D. \(\frac{\mathrm{TV}}{\mathrm{P}}=\) constant

Question 199:

The equation of a wave traveling Along the positive \(x\) direction is given by \(y=\) \(0.20 \sin (500 \mathrm{t}\) - 20x).

The amplitude, angular frequency and wavelength of the wave are respectively given by ____________

A. \(0.2 \mathrm{~cm}, 500 \mathrm{rad} / \mathrm{s}, 20 \mathrm{~cm}\)
B. \(0.2 \mathrm{~cm}, 500 \mathrm{rad} / \mathrm{s}, 0.1 \mathrm{\pi cm}\)
C. \(0.2 \mathrm{~cm}, 2 \times 10^{-3} \mathrm{rad} / \mathrm{s}, 0.1 \pi \mathrm{cm}\)
D. \(5 \mathrm{~cm}, 2 \times 10^{-3} \mathrm{rad} / \mathrm{s}, 0.05 \mathrm{~cm}\)

Question 200:

When a plane mirror at which a ray of light is incident is rotated through an angle \(\theta\), the reflected ray will be rotated through ____________

A. \(1 / 2 \theta\)
B. \(\theta\)
C. \(2 \theta\)
D. \(3 \theta\)