Post Utme University of Ibadan Physics Past Questions and Answers

Question 16:

Which of the following statements supports the assumption that light travels in straight lines?

A. Light can be diffracted
B. Light can be reflected
C. A source of light produces interferences patterns on a suitably placed screen
D. A source of light produces distinct shadows of opaque objects

Question 17:

Which of the following is correct about nuclear fission? It is ____________

A. The splitting of a heavy nucleus into two or more lighter particles
B. An agent used to slow down neutrons in a controlled atomic chain reaction
C. Combing light atomic nuclei to form heavy
D. The spontaneous disintegration occurring in the nucleus of certain atoms

Question 18:

A light energy \(E\) falls on a metal and the electrons with a maximum kinetic energy of \(0.2 \mathrm{eV}\) are \(C\) ejected. If the work function of the metal is \(0.3 \mathrm{eV}\), what is the value of \(E\) ?

A. \(0.10 \mathrm{eV}\)
B. \(0.06 \mathrm{eV}\)
C. \(0.50 \mathrm{eV}\)
D. \(1.50 \mathrm{eV}\)

Question 19:

A nucleus is unstable if ____________

A. It has two or more isotopes
B. Its binding energy is not sufficient to hold nuclear particles together.
C. It is very light with very low density
D. It has no significant mass.

Question 20:

A radioactive substance has a half life of 4 years. If its activity today is 200 dps, its activity in 8 years from today is ____________

A. \(50 \mathrm{dps}\)
B. \(25 \mathrm{dps}\)
C. \(20 \mathrm{dps}\)
D. \(10 \mathrm{dps}\)