WAEC Past Questions and Answers - Page 3451

17,251.

The diagram above represents the displacement-time graph of the motion of an object thrown upwards. The velocity of the object at the point P is

A.

maximum

B.

uniform

C.

zero

D.

terminal

Correct answer is C

No explanation has been provided for this answer.

17,252.

The diagram above illustrates a Hare's apparatus. \(\mathit{e}_1, \mathit{e}_2\) represent densities and \(\mathit{h}_1, \mathit{h}_2\) heights of columns of liquids. Which of the following equations is correct?

A.

\(\mathit{h}_1 = \frac{\mathit{h}_2 \mathit{e}_1}{\mathit{e}_2}\)

B.

\(\mathit{h}_1 = \frac{\mathit{h}_2 \mathit{e}_2}{\mathit{e}_1}\)

C.

\(\mathit{h}_1 = \frac{\mathit{e}_1 \mathit{e}_2}{\mathit{h}_2}\)

D.

\(\mathit{h}_1 = \frac{\mathit{e}_1}{\mathit{h}_2 \mathit{e}_2}\)

Correct answer is B

\(\frac{\mathit{h}_2}{\mathit{h}_2} = \mathit{h}_1 = \frac{\mathit{h}_2 \mathit{e}_2}{\mathit{e}_1}\)

17,253.

Calculate the effective resistance between P and Q in the diagram above

A.

0.75\(\Omega\)

B.

4.00\(\Omega\)

C.

5.00\(\Omega\)

D.

7.00\(\Omega\)

Correct answer is B

R = \(\frac{1}{2} + \frac{1}{2} + 3 = 1 + 3 = 4\Omega\)

17,255.

A very sensitive spring balance was used to determine the weight of an object at the north pole. When the same spring balance was used to measure the weight of the same object at the equator, it was found to reduce. The explanation for this observation is that

A.

it is very hot at the equator

B.

the spring balance has expanded

C.

the acceleration of free fall due to gravity varies with location

D.

the mass of the body is reduced

Correct answer is C

No explanation has been provided for this answer.