JAMB - Mathematics (1979)

• 1

  The mean of the numbers 1.2, 1.0, 0.9, 1.4, 0.8, 0.8, 1.2 and 1.1 is

  پاسخ دهید

  (E)

  1.05
• 2

  \((1.28 \times 10^{4}) \div (6.4 \times 10^{2})\) equals

  پاسخ دهید

  (C)

  2 x 10¹
• 3

  If the value of \(\pi\) is taken to be \(\frac{22}{7}\), the area of a semi-circle of diameter 42m is

  پاسخ دهید

  (E)

  693m²
• 4

  (3.2)² - (1.8)² equals

  پاسخ دهید

  (A)

  7.0
• 5

  In \(\bigtriangleup\)PQR, PQ = 10cm, QR = 8cm and RP = 6cm, the perpendicular RS is drawn from R to PQ. Find the length of RS

  پاسخ دهید

  (E)

  4.8cm
• 6

  After getting a rise of 15%, a man's new monthly salary is N345. How much per month did he earn before the increase?

  پاسخ دهید

  (C)

  N300
• 7

  In base ten, the number 101101 (base 2) equals

  پاسخ دهید

  (C)

  45
• 8

  The annul profits of a transport business were divided between the partners A and B in the ratio 3 : 5. If B received N3000 more than A, the total profit was

  پاسخ دهید

  (C)

  N12000
• 9

  x is directly proportional to y and inversely proportional to z. If x = 9 when y = 24 and z = 8, what is the value of x when y = 5 and z = 6?

  پاسخ دهید

  (D)

  2\(\frac{1}{2}\)
• 10

  The solution of the equation x² - 2x = 8 is

  پاسخ دهید

  (B)

  x = -2 or 4
• 11

  A trader goes to Ghana for y days with y cedis. For the first x days, he spends X cedis per day. The amount he has to spend per day for the rest of his stay is

  پاسخ دهید

  (E)

  \(\frac{Y - Xx}{y - x}\) cedis
• 12

  Multiply (3x + 5y + 4z) by (2x - 3y + z)

  پاسخ دهید

  (A)

  6x² + xy - 15y² + 4z² + 11xz - 7yz
• 13

  A square of cardboard is taped at the perimeter by a piece of ribbon 20cm long. What is the area of the board?

  پاسخ دهید

  (C)

  25sq.cm
• 14

  Rationalize the denominator of the expression \(\frac{6 + 2\sqrt{5}}{4 - 3\sqrt{6}}\)

  پاسخ دهید

  (B)

  \(\frac{-(24 + 18\sqrt{6} + 8\sqrt{5} + 6\sqrt{30})}{38}\)
• 15

  Simplify \(\frac{5^x \times 25^{x - 1}}{125^{x + 1}}\)

  پاسخ دهید

  (C)

  5^-5
• 16

  A steel ball of radius 1 cm is dropped into a cylinder of radius 2cm and height 4cm. If the cylinder is now filled with water, what is the volume of the water in the cylinder?

  پاسخ دهید

  (A)

  \(\frac{44}{3}\)\(\pi\)cm³
• 17

  Simplify \(\frac{x^2 + y^2 + xy}{x + y}\) - \(\frac{x^2 + y^2}{x - y}\)

  پاسخ دهید

  (B)

  \(\frac{2y^3} {y^2 - x^2}\)
• 18

  A ladder resting on a vertical wall makes an angles whose tangent is 2.4 with the ground. If the distance between the foot of the ladder and the wall is 50cm, What is the length of the ladder?

  پاسخ دهید

  (E)

  1.3m
• 19

  Simplify 2\(\frac{5}{12}\) - 1\(\frac{7}{8}\) x \(\frac{6}{5}\)

  پاسخ دهید

  (A)

  \(\frac{1}{6}\)
• 20

  One of the following statements is wrong. Which is it?

  پاسخ دهید

  (C)

  If two triangles are similar then they are also congurent
• 21

  PQRS is a cyclic quadrilateral with PQ as diameter of the circle. If < PQS = 15^o find < QRS

  پاسخ دهید

  (D)

  105^o
• 22

  Make c the subject of the equation a(b + c) + \(\frac{5}{d}\) - 2 = 0

  پاسخ دهید

  (B)

  c = \(\frac{2d - 5 - abd}{ad}\)
• 23

  Which of the following values of the variable x, (a)x = 0, (b)x = -3, (c)x = 9, satisfy the inequalities 0 < \(\frac{x + 3}{x - 1}\) < 2?

  پاسخ دهید

  (B)

  (c)
• 24

  On each market day Mrs. Bassey walks to the market from her home at a steady speed. This journey normally takes her 2 hours to complete. She finds, however, that by increasing her usual speed by 1 km/hr she can save 20 minutes. Find her usual speed in km/hr

  پاسخ دهید

  (C)

  5
• 25

  Solve the simultaneous linear equations: 2x + 5y = 11, 7x + 4y = 2

  پاسخ دهید

  (C)

  x = \(\frac{-34}{27}\), y = \(\frac{73}{27}\)
• 26

  If x\(^3\) - 12x - 16 = 0 has x = -2 as a solution then the equation has

  پاسخ دهید

  (C)

  3 roots with two equal and the third different
• 27

  Find the value of (4\(^{\frac{1}{2}}\))\(^6\)

  پاسخ دهید

  (E)

  64
• 28

  Find the value of log\(_{10}\)\(\frac{1}{40}\), given that log10\(_4\) = 0.6021

  پاسخ دهید

  (C)

  -1.6021
• 29

  12 men complete a job in 9 days. How many men working t the same rate would be required to complete the job in 6 days?

  پاسخ دهید

  (B)

  18
• 30

  For the set of numbers 2, 3, 5, 6, 7, 7, 8

  پاسخ دهید

  (E)

  the mean is less than the median
• 31

  Simplify \(\frac{1 - x^2}{x - x^2}\), where x \(\neq\) 0

  پاسخ دهید

  (C)

  \(\frac{1 + x}{x}\)
• 32

  A cylinder of height h and radius r is open at one end. Its surface area is

  پاسخ دهید

  (C)

  2\(\pi\)rh + \(\pi\)r²
• 33

  An arc of circle of radius 2cm subtends an angle of 60º at the centre. Find the area of the sector

  پاسخ دهید

  (A)

  \(\frac{2 \pi}{3}\)cm²
• 34

  What is the greatest straight line distance between two vertices (corners) of a cube whose sides are 2239cm long?

  پاسخ دهید

  (D)

  \(\sqrt{3}\) x 2239cm
• 35

  What is log\(_7{(49^a)}\) - log\(_{10}^{(0.01)}\)?

  پاسخ دهید

  (D)

  2a + 2
• 36

  The size of a quantity first doubles and then increases by a further 16%. After a short time its size decreases by 16%. What is the net increases in size of the quantity?

  پاسخ دهید

  (C)

  200%
• 37

  The following table relates the number of objects f corresponding to a certain size x. What is the average size of an object?
  \(\begin{array}{c|c} f & 1 & 2 & 3 & 4 & 5 \\ \hline x & 1 & 2 & 4 & 8 & 16\end{array}\)

  پاسخ دهید

  (D)

  \(\frac{43}{5}\)
• 38

  If y = x\(^2\) - 2x - 3, find the least value of y and the corresponding value of x

  پاسخ دهید

  (D)

  x = 1, y = -4
• 39

  A father is now three times as old as his son. Twelve years ago he was six times as old as his son. How old are the son and the father?

  پاسخ دهید

  (E)

  20 and 60
• 40

  If \(\sqrt{3^{\frac{1}{x}}}\) = \(\sqrt{9}\) then the value of x is:

  پاسخ دهید

  (E)

  \(\frac{1}{2}\)
• 41

  A man is standing in the corridor of a 10-storey building and looking down at a tall tree in front of the building. He sees the top of the tree at angle of depression of 30^o. If the tree is 200m tall and the man's eyes are 300m above the ground, calculate the angle of depression of the foot tree as seen by the man

  پاسخ دهید

  (B)

  60^o
• 42

  

  In the figure, \(\bigtriangleup\) ABC are in adjacent planes. AB = AC = 5cm, BC = 6cm and o then AE is equal to

  پاسخ دهید

  (B)

  2\(\sqrt{3}\)
• 43

  

  In this figure, PQRS is a parallelogram, PS = PT and < PST = 55\(^o\). The size of <PQR is

  پاسخ دهید

  (D)

  110^o
• 44

  

  If O is the centre of the circle, < POS equls

  پاسخ دهید

  (E)

  150^o
• 45

  

  In the figure, PQ and QR are chords of the circle PQR. QRS is a straight line and PR is equal to RS, < PSR is 20o. What is the size of <POQ.

  پاسخ دهید

  (C)

  80^o
• 46

  

  In the figure, PQ is parallel to SQ ; QS bisets < PSQ, < PQS is 65^o and < RPS is 20^o. What is the size of < PRS?

  پاسخ دهید

  (D)

  30^o
• 47

  

  (Numbers indicate the lengths of the sides of the triangles) If the area of \(\bigtriangleup\) PQR is k2sq. units what is the area of the shades portion?

  پاسخ دهید

  (A)

  \(\frac{5}{9}\)k² sq. units
• 48

  

  In the parallelogram PQRS, PE is perpendicular to QR. Find the area of the parallelogram.

  پاسخ دهید

  (D)

  132cm²
• 49

  

  PQ is parallel to RS. Calculate the value of x.

  پاسخ دهید

  (B)

  40^o
• 50

  

  Find x in the diagram below.

  پاسخ دهید

  (B)

  \(\frac{3(\sqrt{3} - 1)}{\sqrt{3} + 1}\)