Post Utme Physics Past Questions and Answers

Question 106:

The range of wavelengths of the visible spectrum is \(400 \mathrm{~nm}\) to \(700 \mathrm{~nm}\). The wavelength of gamma rays is ____________

A. Shorter than \(700 \mathrm{~nm}\) but longer than \(400 \mathrm{~nm}\)
B. Ionger than \(700 \mathrm{~nm}\)
C. Shorter than \(400 \mathrm{~nm}\)
D. \(550 \mathrm{~nm}\)

Question 107:

If the relative density of \(a\) metal is 19 , what will be the mass of \(20 \mathrm{~cm}^{3}\) of the metal when immersed in water?

A. \(400 \mathrm{~g}\)
B. \(39 \mathrm{~g}\)
C. \(380 \mathrm{~g}\)
D. \(360 \mathrm{~g}\)

Question 108:

Vapour is said to be saturated when ____________

A. More molecules return to die liquid thin the amount that left it
B. A dynamic equilibrium exists between the molecules of the liquid and the vapour molecules at \(s\) given temperature
C. The vapour pressure is equal-to the atmospheric pressure
D. All the molecules are moving with the same speed in all directions at a given temperature

Question 109:

When a transformer has more secondary windings than primary windings; it ____________

A. Has a smaller secondary current
B. Has a greater power output
C. Is a stepdown transformer
D. Increases the total energy output

Question 110:

When light is incident on an object which is magenta in colour, which of the following colours would be absorbed?

A. Red and blue
B. Green only
C. Ited and green
D. Red only