Mathematics questions and answers

Mathematics Questions and Answers

How good are you with figures and formulas? Find out with these Mathematics past questions and answers. This Test is useful for both job aptitude test candidates and students preparing for JAMB, WAEC, NECO or Post UTME.

151.

A boy 14 m tall, stood 10m away from a tree of height 12 m. Calculate, correct to the nearest degree, the angle of elevation of the top of the tree from the boy's eyes.

A.

70º

B.

47º

C.

19º

D.

Correct answer is A

The angle of elevation

= Tan θ = \(\frac{opp}{adj}\)

Tan θ = \(\frac{12+14}{10}\)

Tan θ =  \(\frac{26}{10}\)

θ = Tan\(^{-1}\)(2.6)

θ ≈ 70º

152.

The length of a rectangle is 10 cm. If its perimeter is 28 cm, find the area

A.

30cm\(^2\)

B.

40cm\(^2\)

C.

60cm\(^2\)

D.

80cm\(^2\)

Correct answer is B

perimeter = 2( length + breadth) 

→ 28 = 2 (10+ b) 

14 - 10 = b

b = 4 

Area = length x breadth

10 x 4 → 40cm\(^2\)

153.

In the diagram, ∠ZWZY and WYX are right angles. Find the perimeter of WXYZ.

A.

30cm

B.

32cm

C.

35cm

D.

37cm

Correct answer is B

In ΔWYZ: 

hyp\(^2\) = adj\(^2\) + opp\(^2\)

hyp\(^2\) =3\(^2\) + 4\(^2\) → 9 + 16

hyp\(^2\) = 25

hyp = 5

In  ΔWXY:

hyp\(^2\) = adj\(^2\) + opp\(^2\)

hyp\(^2\) = 12\(^2\) + 5\(^2\) = 144 +25

hyp\(^2\) = 169

hyp = 13

the perimeter of WXYZ. = 3+4+12+13 → 32cm

154.

A cylinder, opened at one end, has a radius of 3.5cm and height 8cm. calculate the total surface area

A.

126.5cm\(^2\)

B.

165.0cm\(^2\)

C.

212.0cm\(^2\)

D.

214.5cm\(^2\)

Correct answer is D

The surface area of an open-top cylinder = πr(r + 2h),

where 'r' is the radius and 'h' is the height of the cylinder.

= \(\frac{22}{7}\) * 3.5 (3.5 + 2 * 8)

= 11 (3.5 + 16) → 11 (19.5)

= 214.5cm\(^2\)

155.

A ladder 6m long leans against a vertical wall at an angle 53º to the horizontal. How high up the wall does the ladder reach?

A.

3.611m

B.

4.521m

C.

4.792m

D.

3.962m

Correct answer is C

Sin θ = \(\frac{opp}{hyp}\) → \(\frac{x}{6}\)

cross multiply:

sin53º * 6 = x

0.7986 * 6

 4.792m