WAEC Physics Past Questions & Answers - Page 305

1,521.

Which of the following instruments is suitable for making the most accurate measurement of the internal diameter of a test tube?

A.

metre rule

B.

A pair of callipers

C.

A micrometer screw gauge

D.

A tape rule

E.

A set square

Correct answer is B

No explanation has been provided for this answer.

1,522.

The electric force between two point charges each of the magnitude, q at a distance of r apart in air of permittivity is:

A.

q2/4πεr

B.

0/q2

C.

4πq/ε0

D.

qr20

E.

0/4πε0r2

Correct answer is E

No explanation has been provided for this answer.

1,523.

Calculate the escape velocity for a rocket fired from the earth's surface at a point where the acceleration due to gravity is 10ms-2 and the radius of the earth is 6 x 106m.

A.

7.8 x 106ms-12

B.

1.1 x 104ms-1

C.

3.5 x 107ms-1

D.

6.0 x 107 ms-1

E.

1.2 x 108ms2-1

Correct answer is B

Hint: V = √2gr = √(2x10x6x106) + 1.1 x 104ms-1

1,524.

What is the gravitational potential due to a molecule of mass, m and at a distance, r from it? (G = gravitational constant).

A.

Gm2/r2

B.

Gm/r

C.

Gm2/r

D.

G2m2/r

E.

m2/Gr2

Correct answer is B

No explanation has been provided for this answer.

1,525.

Which of the following is not a property of longitudinal waves?

A.

compression

B.

reflection

C.

refraction

D.

polarization

E.

diffraction

Correct answer is D

No explanation has been provided for this answer.