WAEC Physics Past Questions & Answers - Page 191

951.

A man was moving round a circular path continuously for 4 minutes and covered the following distances in the times stated :
Distance (in metres) 200, 400, 600, 300
Time(in minutes) : 1, 2, 3, 4 respectively. Which of the following statements is correct about the motion of the man?

A.

the man was moving without uniform velocity

B.

the speed was changing constantly

C.

the velocity was uniform

D.

it was an instance of motion in which both speed and velocity are the same

Correct answer is C

No explanation has been provided for this answer.

952.

The magnitude of the force required to make an object of mass, m move with speed, v in a circular of radius r is given by the expression

A.

\(\frac{mr}{v}\)

B.

\(\frac{mr^2}{v}\)

C.

\(\frac{mv^2}{r}\)

D.

\(\frac{mv}{r^2}\)

Correct answer is C

No explanation has been provided for this answer.

953.

A boy travels 8 km eastward to a point B and then 6km northward to another point C. Determine the difference between the magnitude of displacement of the boy and distance travelled by him

A.

2.0km

B.

4.0km

C.

10.0km

D.

13.0km

Correct answer is B

AC = \(\sqrt{8^2 + 6^2}\) = 10km

Distance travelled = 8 + 6 = 14km

Difference = 4 - 10 = 4km

954.

One common characteristics of solids, liquids and gasses is that?

A.

all the three has fixed volume

B.

their molecule have the same size

C.

their molecules are always in motion

D.

all the three have the same inter molecular forces

Correct answer is C

The kinetic theory of matter (particle theory) says that all matter consists of many, very small particles which are constantly moving or in a continual state of motion.

955.

A solid weighs 45N and 15N respectively in air and water. Determine the relative density of the solid

A.

0.33

B.

0.50

C.

1.50

D.

3.00

Correct answer is C

R.d = \(\frac{\text{weight in air}}{\text{apparent loss of weight in water}} = \frac{45}{45 - 15}\)

= \(\frac{45}{30} = 1.50\)