University of Nigeria Physics Post Utme Past Questions and Answers

Question 6 :

A narrow beam of white light ca be split up into different colours by a glass prism. The correct explanation is that ____________

A. White light is electromagnetic wave
B. The prism has all the colours of the white light
C. White light has undergone total internal reflection in the prism
D. Different colours of white light travel with different speeds in glass

Question 7 :

Two forces whose resultant is \(100 \mathrm{~N}\), are at right angles to each other. If one of them makes an angle of \(30^{\circ}\) with the resultant, determine its magnitude.

A. \(8.66 \mathrm{~N}\)
B. \(50.0 \mathrm{~N}\)
C. \(57.7 \mathrm{~N}\)
D. \(86.6 \mathrm{~N}\)

Question 8 :

A conductor of length \(2 \mathrm{~m}\) carries a current of \(0.8\) A while kept in magnetic field of magnetic flux density \(0.5 \mathrm{~T}\). The maximum force acting on it is ____________

A. \(8.0 \mathrm{~N}\)
B. \(3.2 \mathrm{~N}\)
C. \(0.8 \mathrm{~N}\)
D. \(0.2 \mathrm{~N}\)

Question 9 :

A heavy object is suspended from a string and lowered into water so that is completely submerged. The object appears lighter because ____________

A. The density of water is less than that of the object
B. The pressure is low just below the water surface
C. If experiences an up thrust
D. The tension in the string neutralizes part of the weight

Question 10 :

If a man is standing between two parallel plane mirrors with their reflecting surfaces facing each other, how many images of the man will be formed?

A. 8
B. 2
C. 4
D. Infinite