Physics questions and answers

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.

1,741.

A machine of efficiency 80% is used to lift a box. If the effort applied by the machine is twice the weight of the box. Calculate the velocity ratio of the machine

A.

0.50

B.

0.63

C.

0.80

D.

1.60

Correct answer is B

Y = \(\frac{M.A}{V.R} \times \frac{100}{1}\)

= \(\frac{\frac{1}{2}}{V.R} \times \frac{100}{1}\)

V.R = 0.625

1,742.

A stone of mass 0.5kg is dropped from a height of 12m. Calculate its maximum kinetic energy. [g = 10ms-1]

A.

3.0J

B.

6.0J

C.

30.0J

D.

60.0J

Correct answer is D

K.E = P.E = mgh

= 0.5 x 10 x 12 = 60J

1,743.

Electric energy is measured in

A.

ampere

B.

coulomb

C.

kilowatt-hour

D.

kilowatt

Correct answer is C

No explanation has been provided for this answer.

1,745.

The period of a simple pendulum of length 80.0cm was found to have doubled when the length of the pendulum was increased by X. Calculate X.

A.

26.7cm

B.

40.0cm

C.

160.0cm

D.

240.0cm

Correct answer is D

No explanation has been provided for this answer.