Post Utme Physics Past Questions and Answers

Question 516:

A simple pendulum with a period of \(2.0 \mathrm{~s}\) has its length doubled. Its new period is ____________

A. \(1.00 \mathrm{~s}\)
B. \(1.41 \mathrm{~s}\)
C. \(0.35 \mathrm{~s}\)
D. \(2.83 \mathrm{~s}\)
E. \(4.00 \mathrm{~s}\)

Question 517:

In order to find the depth of the sea. A ship sends out a sound wave and receives an echo after one second. If the velocity of sound in water is \(1500 \mathrm{~ms}^{-1}\) What is the depth of the sea?

A. \(0.75 \mathrm{~km}\)
B. \(1.50 \mathrm{~km}\)
C. \(2.20 \mathrm{~km}\)
D. \(3.00 \mathrm{~km}\)
E. \(3.75 \mathrm{~km}\)

Question 518:

A uniform cylindrical block of wood floats in water with one- third of height, above the water levels. in a liquid of relative density 0.8. what fraction of its height will be above the liquid level?

A. \(1 / 6\)
B. \(1 / 5\)
C. \(4 / 5\)
D. \(5 / 6\)

Question 519:

The resistance of a platinum wire at the ice and steam points are \(0.75\) ohm and \(1.05\) ohm respectively. Determine the temperature at which the resistance of the wire is \(0.90\) ohm?

A. \(43.0^{\circ} \mathrm{C}\)
B. \(50.0^{\circ} \mathrm{C}\)
C. \(69.9^{\circ} \mathrm{C}\)
D. \(87.0^{\circ} \mathrm{C}\)

Question 520:

The electrochemical equivalent or platinum is \(5.0 \times 10^{-}\) \({ }^{7} \mathrm{kgC}^{-1}\). To plate out \(1.0 \mathrm{~kg}\) of platinum, a current of \(100 \mathrm{~A}\) must he passed through as appropriate vessel for

A. \(5.6\) hours
B. 56 hours
C. \(1.4 \times 10^{4}\) hours
D. \(2.0 \times 10^{4}\) hours