2002 - JAMB Mathematics Past Questions and Answers - page 3

21
The ninary operation * is defined on the set of integers p and q by p*q = pq + p + q. Find 2 * (3 * 4).
A
59
B
19
C
67
D
38
correct option: a
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22
The sum to infinity of the series: 1 + (1/3) + (1/9) + (1/27) + ... is
A
11/3
B
10/3
C
5/2
D
3/2
correct option: d
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23
If x varies directly as √n and x = 9 when n = 9, find x when n = (17/9)
A
4
B
27
C
√3
D
√17
correct option: d
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24
A chord of a circle subtends an angle of 12o degrees at the centre of a circle of diameter 4√3 cm. Calculate the area of the major sector.
A
4π cm2
B
32 π cm2
C
16 π cm2
D
8 π cm2
correct option: d
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25
If tan θ = 4/3, calculate sin2θ - cos2θ.
A
16/25
B
24/25
C
7/25
D
9/25
correct option: c
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26
Find the equation of the set of points which are equidistant from the parallel lines x = 1 and x = 7
A
y = 3
B
x = 3
C
x = 4
D
y = 4
correct option: c
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27
A bucket is 12 cm in diameter at the top, 8 cm in diameterat the bottom and 4 cm deep. Calculate its volume.
A
304π/3 cm3
B
144π cm3
C
128π cm3
D
72π cm3
correct option: a
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28
The sum of the interior angles of a polygon is 20 right angles. How many sides does the polygon have?
A
12
B
20
C
40
D
10
correct option: a
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29
Find the coordinates of the mid-point of x and y intercepts of the line 2y = 4x - 8
A
(2, 0)
B
(1, -2)
C
(-1, -2)
D
(1, 2)
correct option: b
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30
A hunter 1.6 m tall, views a bird on top of a tree at an angle of 45 degrees. if the distance between the hunter and the tree is 10.4 m, find the height of the tree.
A
9.0 m
B
12. 0 m
C
8.8 m
D
10.4 m
correct option: b
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