Post Utme Physics Past Questions and Answers

Question 231:

A bar of initial length \(\mathrm{I}_{0}\) is heated through a temperature range \(\Delta \theta\) to a new length I. The linear expansivity of the bar is ____________

A. \(\frac{1-\mathrm{lo}}{1 \Delta \theta}\)
B. \(\frac{1-1}{10 \Delta \theta}\)
C. \(\mathrm{I}_{0}(1+\Delta \theta)\)
D. \(\frac{1-10}{1(1+\Delta \theta)}\)

Question 232:

The real depth of a pond is \(6.0\) in. A boy observes a fish at the bottom of the pond. What is the apparent depth if the refractive index is \(4 / 3 ?\)

A. \(8.0 \mathrm{~m}\)
B. \(5.5 \mathrm{~m}\)
C. \(5.0 \mathrm{~m}\)
D. \(4.5 \mathrm{~m}\)

Question 233:

If \(U\) is the object distance and \(V\) the image distance, which of the following expressions gives the linear magnification produced by a convex lens of focal length f?

A. \(\frac{U}{f}-f\)
B. \(\frac{u}{v}+f\)
C. \(\frac{v}{r}+1\)
D. \(\frac{\mathrm{v}}{\mathrm{f}}-1\)

Question 234:

A light wave has a wavelength of \(500 \mathrm{~nm}\) in air. The frequency of the wave is ____________

A. \(3.0 \times 10^{14} \mathrm{~Hz}\)
B. \(6.0 \times 10^{14} \mathrm{~Hz}\)
C. \(6.0 \times 10^{12} \mathrm{~Hz}\)
D. \(2.5 \times 10^{14} \mathrm{~Hz}\)

Question 235:

The principle of operation of an induction coil is based on 4. The particle and wave nature of matter are demonstrated in the equation

A. \(\lambda=h c / E\)
B. \(\lambda=c / f\)
C. \(\lambda=h / p\)
D. \(\lambda=2 d \sin 0\)