Obafemi Awolowo University Physics Post Utme Past Questions and Answers

Question 16 :

Light waves and ripples of water are similar because both ____________

A. Are longitudinal waves
B. Have the same velocity
C. Can be diffracted and refracted
D. Have the same frequency

Question 17 :

Three \(4-\Omega\) resistors were connected in series by Tola while Ade connected the same set of resistors in parallel. The ratio of the value obtained by Ade to that obtained by Tola is ____________

A. 1:2
B. 1:9
C. 1:10
D. 1:5

Question 18 :

Three resistors are connected as shown in the diagram below. The equivalent resistance between points \(X\) and \(Y\) is ____________

A. \(8.0 \Omega\)
B. \(22.0 \Omega\)
C. \(4.25 \Omega\)
D. \(3.27 \Omega\)

Question 19 :

A coil of copper wire of \(N\) turns is kept rotating between the poles of a permanent magnet such that the magnetic flux linking the coil changes continuously. Which of the following statements is TRUE?

A. An e.m.f. is induced in the coil such that when the change of flux is positive, the e.m.f. is positive, and when the change of flux is negative, the e.m.f. is negative
B. An e.m.f. is induced in the coil whose magnitude is inversely proportional to both the number of turns in the coil and the rate of change of magnetic flux
C. An e.m.f. is set up in the permanent magnet which reduces the flux in the coil to zero
D. A current flows in the coil and an e.m.f. is set up proportional to

Question 20 :

What is the equivalent capacitance between points \(A\) and \(B\) in the diagram below?

A. \(12.0 \mu F\)
B. \(1.1 \mu F\)
C. \(1.6 \mu F\)
D. \(7.7 \mu F\)