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.

2,411.

The angle of depression of a boat from the top of a cliff 10m high is 30. How far is the boat from the foot of the cliff?

A.

\(\frac{5√3m}{3}\)

B.

5√3m

C.

10√3m

D.

\(\frac{10√3m}{3}\)

Correct answer is C

RQP = 90o

PQS = 30o but

RQS = 90o = \(\frac{RS}{10}\)

RS = 10 tan 60o

RS = 10 tan 60o

RS = 10√3m

2,412.

If M(4, q) is the mid-point of the line joining L(p, -2) and N(q, p). Find the values of p and q

A.

P = 2, q = 4

B.

p = 3, q = 1

C.

p = 5, q = 3

D.

p = 6, q = 2

Correct answer is D

\(\frac{p + q}{2}\) = 4

p + q = 8 ....(i)

\(\frac{p - 2}{2}\) = q

p - 2q 2 ....(ii)

q = 2, p = 6

3q = 6

2,413.

What is the locus of a point P which moves on one side of a straight line XY, so that the angle XPY is always equal to 90o?

A.

the perpendicular bisector of XY

B.

a right-angled triangle

C.

a circle

D.

a semi circle

Correct answer is D

Since XY is a fixed line and

XPY = 90o P is on one side of XY

P1P2P3......Pn are all possible cases where

XPY = 90o the only possible tendency is a semicircle because angles in semicircle equals 90o

2,414.

Calculate the perimeter, in cm, of a sector of a circle of radius 8cm and angle 45o

A.

2\(\pi\)

B.

8 + 2\(\pi\)

C.

16 + 2\(\pi\)

D.

16 + 16\(\pi\)

Correct answer is C

Perimeter = OP + OQ + PQ

= 8 + 8 + PQ

length PQ = \(\frac{\theta}{360 \times 2\pi r}\)

= \(\frac{45}{360}\) x 2 x \(\pi\) x 8

= 2\(\pi\)

Perimeter of sector 2r + L

Where l = length of arc and r = radius

∴ P = 2(8) + 2\(\pi\)

= 16 + 2\(\pi\)

2,415.

An open rectangular box is made of wood 2cm thick. If the internal dimensions of the box are 50cm long, 36cm wide and 20cm deep, the box volume of wood in the box is

A.

11 520cm3

B.

36 000cm3

C.

38 200cm3

D.

47 520cm3

Correct answer is A

Internal dimension are 50cm, 36cm and 20cm

internal volume = 50 x 36 x 20cm3

1000 x 36cm3

= 36000cm3

External dimension are 54cm x 40cm x 22cm

= 2160cm2 x 22cm = 47520cm3

Volume of wood = Ext. volume - Int. volume

= 47,520cm3 - 36,000cm3

= 11,520cm3