WAEC Past Questions and Answers - Page 3943

19,711.

The teeth used for tearing and cutting are

A.

canine and molars

B.

premolar and incisors

C.

molar and incisors

D.

canine and incisors

Correct answer is D

No explanation has been provided for this answer.

19,712.

Solve the inequality 2x + 3 < 5x

A.

\(x>1\)

B.

\(x<\frac{3}{7}\)

C.

\(x>\frac{3}{7}\)

D.

\(x>-1\)

Correct answer is A

2x + 3 < 5x
-3x < -3
X > 1

19,713.

A survey shows that 28% of all the men in a village wear size 9 shoes. What is the probability that a man selected at random in the village wears size 9 shoes?

A.

\(\frac{7}{25}\)

B.

\(\frac{41}{50}\)

C.

\(\frac{1}{2}\)

D.

1

Correct answer is A

P(man picked at random wears size 9 shoes) = \(\frac{28}{100}\)

= \(\frac{7}{25}\)

19,714.

Use the information on the stages involved in conjugation to answer the question below

I. Transfer of one cell content into the adjacent cell
II. Formation of a conjugation tube
III. Secretion of thick wall to form a zygospore
IV. Formation of a protuberance
V. Germination of a filament

Which of the following arrangements is the correct sequence of the process?

A.

II, I, IV, V and III

B.

IV, II, I, III and V

C.

IV, I, II, V and III

D.

V, II, III, IV and I

Correct answer is A

No explanation has been provided for this answer.

19,715.

The root of a quadratic equation in x, are -m and 2n. Find the equation

A.

\(x^2 + x(m - 2n)-2mn=0\)

B.

\(x^2 - x(m - 2n)-2mn=0\)

C.

\(x^2 - x(m - 2n)+2mn=0\)

D.

\(x^2 + x(m - 2n)+2mn=0\)

Correct answer is A

x = -m \(\implies\) x + m = 0;

x = 2n \(\implies\) x - 2n = 0.

\(\implies (x + m)(x - 2n) = 0\)

\(x^2 + mx - 2nx - 2mn = 0\)

\(x^2 + x(m - 2n) - 2mn = 0\)