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

View answer & explanation

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.

rε₀/q²

C.

4πq/ε₀

D.

qr²/ε₀

E.

qε₀/4πε₀r²

View answer & explanation

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 10⁸ms^2-1

View answer & explanation

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

View answer & explanation

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

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

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