Post Utme Physics Past Questions and Answers

Question 161:

If light with photon energy 2eV is incident of surface of a metal with work function 3eV, then ____________

A. No electron will be emitted
B. The few electrons emitted will have maximum kinetic energy of 1eV
C. The few electrons emitted will have a maximum kinetic energy of 3eV
D. Many electrons will be emitted with maximum kinetic energy of 5eV

Question 162:

In a nuclear fusion experiment, the loss of \(m\) amount to \(1.0 \times 10^{-6} \mathrm{~kg}\). The amount of energy obtained from the fusion (speed of light \(=3.0 \times 10^{6} \mathrm{~m} / \mathrm{s}\) ) is ____________

A. \(3.0 \times 10^{-4} \mathrm{~J}\)
B. \(3.0 \times 10^{-4} \mathrm{~J}\)
C. \(9.0 \times 10^{-4} \mathrm{~J}\)
D. \(9.0 \times 10^{10} \mathrm{~J}\)

Question 163:

The extension of a spring when 5 g weight was hung from it was 0.56cm. If Hooke’s law is obeyed, what is the extension caused by a load 20g weight?

A. 1.12 cm
B. 2.14 cm
C. 2.52cm
D. 2.2401

Question 164:

The distance travelled by a particle starting from rest is plotted against the square of the time-elapsed from the commencement of motion. The resulting graph is a measure of ____________

A. Initial displacement.
B. Initial velocity
C. Acceleration
D. Average velocity

Question 165:

A 90cm uniform lever has a load of 30N suspended at 15cm from one of its ends. If the fulcrum is at the centre of gravity, the force that must be applied at its other end to keep it in horizontal equilibrium is ____________

A. 15N
B. 20N
C. 30N
D. 60N