Post Utme Physics Past Questions and Answers

Question 786:

A train with an initial velocity of \(20 \mathrm{~ms}^{-1}\) Is subjected to a uniform deceleration of
\(2 \mathrm{~m}^{-2}\). The time required to bring the train to a complete halt is

A. \(5 \mathrm{~s}\)
B. \(10 \mathrm{~s}\)
C. \(20 \mathrm{~s}\)
D. \(40 \mathrm{~s}\)

Question 787:

Calculate the work done when a force of \(20 \mathrm{~N}\) stretches a spring by \(50 \mathrm{~mm}\)

A. \(0.5 \mathrm{~J}\)
B. \(1.53\) J
C. \(2.0 \mathrm{~J}\)
D. \(2.5 \mathrm{~J}\)

Question 788:

Which of the following obeys ohms laws?

A. Electrolytes
B. Metals
C. Diode
D. Glass

Question 789:

What is the equivalent of \(20 \mathrm{k}\) in Celslus scale?

A. \(293^{\circ} \mathrm{C}\)
B. \(68^{\circ} \mathrm{C}\)
C. \(20^{\circ} \mathrm{C}\)
D. \(120^{\circ} \mathrm{C}\)

Question 790:

A current of 20 A flows through a cable whose resistance is \(5 \Omega\). Calculate the electile power dissipated

A. \(2 \times 10^{2} \mathrm{~W}\)
b. \(2 \times 10^{4} \mathrm{~W}\)
B. \(1 \times 10^{3} \mathrm{~W}\)
C. \(1 \times 10^{2} \mathrm{~W}\)