WAEC Physics Past Questions & Answers - Page 304

1,516.

The diagram above represents a portion of a micrometer screw 20 gauge. What is its reading?

A.

3.70mm

B.

3.67mm

C.

3.50mm

D.

3.33mm

E.

3.17mm

Correct answer is E

No explanation has been provided for this answer.

1,517.
1,518.

Which of the following are contact forces?

I. Force of tension
II. Force of fiction,
III. Magnetic force
IV. Force of reaction.

A.

I,II and III only

B.

I, II and IV only

C.

I, III and IV only

D.

II, III and IV only

E.

l and IV only.

Correct answer is B

No explanation has been provided for this answer.

1,520.

A particle of mass 2.5 x 10-6kg revolving around the earth has a radial acceleration of 4 X 107 ms-2. What is the centripetal force of the particles?

A.

6.25 x 10-14N

B.

1.60 x10-13N

C.

5.00 x 10N

D.

1.00x102N

E.

2.00x1O2N

Correct answer is D

F = ma = 2.5 x 10-6 x 4 x 107 = 100N