Loading [MathJax]/jax/output/HTML-CSS/fonts/TeX/fontdata.js

Physics Questions and Answers

If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.

HOT! Are you HIV Positive? Looking for love? Click here to join the HIV+ dating Network in Nigeria.

2,871.

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

2.5 x 10⁷N

5.0 x 10⁴N

5.0 x 10²N

2.0 x 10^-3N

View answer & explanation

Correct answer is B

Thrust = $\frac{\text{mass x velocity}}{time}$

= 10 x 5 x 10³

= 5.0 x 10⁴N

2,872.

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

cos $\theta$ = $\frac{3}{7}$

sin $\theta$ = $\frac{3}{7}$

tan $\theta$ = $\frac{3}{7}$

cot $\theta$ = $\frac{3}{7}$

View answer & explanation

Correct answer is C

$\theta$ = tan^-1 $\frac{3}{7}$

2,873.

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.

27%

14%

View answer & explanation

Correct answer is C

Actual thickness = 34 - 22 = 12

error thickness = 30 - 20 = 10

error = 12 - 10 = 2mm that is, (11 ± 1)mm

%error = $\frac{1}{11}$ x $\frac{100}{1}$

= 9%