Post Utme Physics Past Questions and Answers

Question 856:

Dispersion of light by a glass prism is due to the ____________

A. Different hidden colours of the glass
B. Different speeds of the various colours in glass
C. Defects in the glass
D. High density of the glass compared to air

Question 857:

In a resonance tube experiment, if the fundamental frequency of the vibrating air column is \(280 \mathrm{~Hz}\), the frequency of third overtone is ____________

A. \(70 \mathrm{~Hz}\)
B. \(840 \mathrm{~Hz}\)
C. \(1120 \mathrm{~Hz}\)
D. \(1960 \mathrm{~Hz}\)

Question 858:

A thermometer with an arbitrary scale, \(S\), of equal division registers steam point, calculate the Celsius temperature corresponding to \(60^{\circ} \mathrm{C}\).

A. \(25.0^{\circ} \mathrm{C}\)
B. \(50.0^{\circ} \mathrm{C}\)
C. \(66.7^{\circ} \mathrm{C}\)
D. \(75.0^{\circ} \mathrm{C}\)

Question 859:

How long does it take a \(750 \mathrm{~W}\) theatre to raise the temperature of \(1 \mathrm{~kg}\) of water from \(20^{\circ} \mathrm{C}\) to \(50^{\circ} \mathrm{C}\) ?
[specific heat capacity of water \(=4200 \mathrm{jkg}^{-1} \mathrm{~K}^{-1}\) ]

A. \(84 \mathrm{sec}\)
B. \(112 \mathrm{sec}\)
C. \(168 \mathrm{sec}\)
D. \(280 \mathrm{sec}\)

Question 860:

The saturated vapour of a liquid increases as the ____________

A. Volume of the liquid increases.
B. Volume of the liquid decreases
C. Temperature of the liquid increases
D. Temperature of the liquid decreases