Post Utme Physics Past Questions and Answers

Question 1296:

Calculate the length of a displaced pendulum bob that passes its lowest point twice every second. \(\left[g=10 ms ^{-2}\right]\)

A. \(1.000 m\)
B. \(0.253 m\)
C. \(0 .450 m\)
D. \(0.58 m\)

Question 1297:

When a ball rolls on a smooth level ground, the motion of its centre is ____________

A. Translational
B. Random
C. Oscillatory
D. Rotational

Question 1298:

A vehicle of mass \(m\) is driven by an engine of power \(P\) from rest. Find the minimum time it will take to acquire a speed \(v\).

A. \(m v^{2} / p\)
B. \(v^{2} / 2 p\)
C. \(m v / p\)
D. \(m v / 2 p\)

Question 1299:

A box of mass \(40 Kg\) is being dragged along by the rope inclined at \(60^{\circ}\) to the horizontal. The frictional force between the box and the floor is \(100 N\) and the tension on the rope is \(300 N\). How much work is done in dragging the box through a distance of \(4 m\) ?

A. \(680 J\)
B. 200J
C. 100J
D. \(400 J\)

Question 1300:

A body is projected from the earth's surface with the hope of letting it escape from the earth's gravitational field. What is the minimum escape velocity?
[Earth's radius \(=\) \(\left.6.4 \times 10^{3} km , g=10 ms ^{-2}\right]\)

A. \(11.3 kms ^{-1}\)
B. \(13.3 kms ^{-1}\)
C. \(12.3 kms ^{-1}\)
D. \(14.3 kms ^{-1}\)