Physics Past Questions and Answers

Which of the following quantities has the same unit as the watt?

A Force x time
B Force x distance
C Force x acceleration
D Force x velocity

Question 717:

The external and internal diameter of a tube are measured as (32 ± 2)mm and (21 ± 1)mm respectively. Determine the percentage error in the thickness of the tube.

A 27%
B 14%
C 9%
D 3%

Question 718:

Two forces of magnitudes 7N and 3N act at right angles to each other. The angle \(\theta\) between the resultant and the 7N force is given by

A Cos\(\theta\) = \(\frac{3}{7}\)
B Sin\(\theta\) = \(\frac{3}{7}\)
C Tan\(\theta\) = \(\frac{3}{7}\)
D Cot\(\theta\) = \(\frac{3}{7}\)

Question 719:

A rocket burns fuel at the rate of 10kgs^-1 and ejects it with velocity of 5 x 10³ms^-1. The thrust exerted by the gas on the rock is

A 2.5 x 10⁷N
B 5.0 x 10⁴N
C 5.0 x 10²N
D 2.0 x 10^-3N

Question 720:

The force experienced by an object of mass 60.0kg in the moon's gravitational field is 1.002 x 10²N. What is the intensity of the gravitational field?

A 0.60Nkg^-1
B 1.67Nkg^-1
C 6.12 x 10²Nkg^-1
D 9.81ms^-2