Post Utme Physics Questions
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 \(10 \mathrm{dps}\)