Year : 
1998
Title : 
Mathematics (Core)
Exam : 
WASSCE/WAEC MAY/JUNE

Paper 1 | Objectives

11 - 20 of 63 Questions

# Question Ans
11.

Find the number whose logarithm to base 10 is 2.6025

A. 0.0004

B. 4.004

C. 40.04

D. 400.4

E. 4004

D

12.

A piece of cloth was measured as 6.10m. If the actual length of the cloth is 6.35, find the percentage error, correct to 2 decimal places

A. 3.05%

B. 3.95%

C. 15.00%

D. 25.00%

E. 39.30%

B

13.

Simplify \(\frac{8^{\frac{2}{3}}*27^{\frac{-1}{3}}}{64^{\frac{1}{3}}}\)

A. -3

B. \(\frac{1}{9}\)

C. \(\frac{1}{3}\)

D. \(\frac{27}{8}\)

E. 4

Detailed Solution

\(\frac{8^{\frac{2}{3}}*27^{\frac{-1}{3}}}{64^{\frac{1}{3}}}\)
\(\frac{2^2*3^{-3}}{4} = 3^{-1} = \frac{1}{3}\)
14.

Solve the equation 5x2 - 4x - 1 = 0

A. -1, 1/5

B. -1, -1/5

C. 1, 1/5

D. 1, -1/5

E. -1, 5

Detailed Solution

5x2 - 4x - 1 = 0
5x2 5x + x -1 = 0
5x(x - 1) + (x - 1) = 0
(5x + 1)(x -1) = 0
x = -1/5 or 1 = 0
15.

P and q are two positive numbers such that p > 2q. Which one of the following statements is not true?

A. -p < -2q

B. -p > -2q

C. -q < 2p

D. q < 1/2p

E. p2 > 2q2

B

16.

For what value of x is the expression
x - 5/x2 - 2x - 3
not defined?

A. 3, 1

B. -1, -3

C. -1, 3

D. 3, -2

E. 1, -3

Detailed Solution

x2 - 2x - 3 = 0
x2 - 3x + x - 3 = 0
x(x - 3) + (x - 3) = 0
(x + 1)(x - 3) = 0
x = -1 or 3
17.

Make S the subject of the formula: \(V = \frac{K}{\sqrt{T-S}}\)

A. \(T-\frac{K^2}{V^2} = S\)

B. \(T+\frac{K^2}{V^2} = S\)

C. \(T-\frac{K^2}{V} = S\)

D. \(T-\frac{K}{V} = S\)

E. \(T-\frac{K}{V^2} = S\)

Detailed Solution

\(V = \frac{K}{\sqrt{T-S}}\)
square both sides of the equation
\(V^2 = \frac{K^2}{T-S}\)
cross multiply
\(V^2 T - S = K^2\)
\(T - S = \frac{K^2}{V^2}\)
\(T = \frac{K^2}{V^2} + S\)
\(T - = \frac{K^2}{V^2} = S\)
18.

Find the equation whose roots are \(\frac{2}{3}and \frac{-1}{4}\)

A. \(12x^2+11x+2=0\)

B. \(12x^2-11x+2=0\)

C. \(x^2-\frac{11}{12}x+2=0\)

D. \(x^2+\frac{11}{12}x-2=0\)

E. \(12x^2+11x+2=0\)

A

19.

Find (X-Y) if 4x - 3y = 7 and 3x - 2y = 5

A. 4

B. 3

C. 2

D. -2

E. -3

C

20.

Solve the inequality \((Y-3)<\frac{y}{3}\)

A. y > -9

B. y < 3

C. y > 4

D. y < 9

E. y > 0

Detailed Solution

\((Y-3)<\frac{y}{3}\\
3y - 9 < y\\
2y< 9\\
y < 4\frac{1}{2}\)
11.

Find the number whose logarithm to base 10 is 2.6025

A. 0.0004

B. 4.004

C. 40.04

D. 400.4

E. 4004

D

12.

A piece of cloth was measured as 6.10m. If the actual length of the cloth is 6.35, find the percentage error, correct to 2 decimal places

A. 3.05%

B. 3.95%

C. 15.00%

D. 25.00%

E. 39.30%

B

13.

Simplify \(\frac{8^{\frac{2}{3}}*27^{\frac{-1}{3}}}{64^{\frac{1}{3}}}\)

A. -3

B. \(\frac{1}{9}\)

C. \(\frac{1}{3}\)

D. \(\frac{27}{8}\)

E. 4

Detailed Solution

\(\frac{8^{\frac{2}{3}}*27^{\frac{-1}{3}}}{64^{\frac{1}{3}}}\)
\(\frac{2^2*3^{-3}}{4} = 3^{-1} = \frac{1}{3}\)
14.

Solve the equation 5x2 - 4x - 1 = 0

A. -1, 1/5

B. -1, -1/5

C. 1, 1/5

D. 1, -1/5

E. -1, 5

Detailed Solution

5x2 - 4x - 1 = 0
5x2 5x + x -1 = 0
5x(x - 1) + (x - 1) = 0
(5x + 1)(x -1) = 0
x = -1/5 or 1 = 0
15.

P and q are two positive numbers such that p > 2q. Which one of the following statements is not true?

A. -p < -2q

B. -p > -2q

C. -q < 2p

D. q < 1/2p

E. p2 > 2q2

B

16.

For what value of x is the expression
x - 5/x2 - 2x - 3
not defined?

A. 3, 1

B. -1, -3

C. -1, 3

D. 3, -2

E. 1, -3

Detailed Solution

x2 - 2x - 3 = 0
x2 - 3x + x - 3 = 0
x(x - 3) + (x - 3) = 0
(x + 1)(x - 3) = 0
x = -1 or 3
17.

Make S the subject of the formula: \(V = \frac{K}{\sqrt{T-S}}\)

A. \(T-\frac{K^2}{V^2} = S\)

B. \(T+\frac{K^2}{V^2} = S\)

C. \(T-\frac{K^2}{V} = S\)

D. \(T-\frac{K}{V} = S\)

E. \(T-\frac{K}{V^2} = S\)

Detailed Solution

\(V = \frac{K}{\sqrt{T-S}}\)
square both sides of the equation
\(V^2 = \frac{K^2}{T-S}\)
cross multiply
\(V^2 T - S = K^2\)
\(T - S = \frac{K^2}{V^2}\)
\(T = \frac{K^2}{V^2} + S\)
\(T - = \frac{K^2}{V^2} = S\)
18.

Find the equation whose roots are \(\frac{2}{3}and \frac{-1}{4}\)

A. \(12x^2+11x+2=0\)

B. \(12x^2-11x+2=0\)

C. \(x^2-\frac{11}{12}x+2=0\)

D. \(x^2+\frac{11}{12}x-2=0\)

E. \(12x^2+11x+2=0\)

A

19.

Find (X-Y) if 4x - 3y = 7 and 3x - 2y = 5

A. 4

B. 3

C. 2

D. -2

E. -3

C

20.

Solve the inequality \((Y-3)<\frac{y}{3}\)

A. y > -9

B. y < 3

C. y > 4

D. y < 9

E. y > 0

Detailed Solution

\((Y-3)<\frac{y}{3}\\
3y - 9 < y\\
2y< 9\\
y < 4\frac{1}{2}\)