WAEC Past Questions and Answers - Page 3265

16,321.

In open market operations, what the Central Banks sells or buys are

A.

Shares

B.

Debentures

C.

Securities

D.

Equities

Correct answer is C

Open market operations is where the federal government through the central bank buys and sells government securities to control the money supply and interest rates. 

16,322.

The different between birth rate and death rate is known as

A.

Demographic transition

B.

Natural growth rate

C.

Migration rate

D.

Fertility rate

Correct answer is B

The natural growth rate refers to the difference between the number of live births and the number of deaths occurring in a year.

16,323.

The velocity ratio of an inclined plane

A.

increases with increase in the angle of inclination

B.

increases with decrease in the angle of inclination

C.

decreases with decrease in the angle of inclination

D.

is independent of the angle of inclination

Correct answer is A

No explanation has been provided for this answer.

16,324.

A body of mass 11kg is suspended from a ceiling fan by an aluminum wire of length 2m and diameter 2mm. Calculate the elastic energy stored in the wire [Young's modulus of aluminum is 7.0 x 1010Nm-2, g = 10ms-2, \(\pi\) = 3.142]`

A.

1.1 x 10-1J

B.

5.5 x 10-2J

C.

1.1 x 10-4J

D.

5.5 x 10-8J

Correct answer is B

e = \(\frac{4FI}{Y \pi d^2} = \frac{4 \times 11 \times 10 \times 2}{7 \times 10^3 \times 3.14(2 \times 10^{-2})^2}\)

= 0.001m

E = \(\frac{1}{2} Fe = \frac{1}{2} \times 110 \times 0.001\)

= 5.5 x 10-2J

16,325.

A price index as a statistic, measures

A.

How the value of money changes over time

B.

The volume of currency in the economy

C.

The exchange rate of a country's currency

D.

The composition of goods and services

Correct answer is A

A price index is a measure of how prices change over a period of time, or it is a way to measure inflation.