# Mathematics 2021 Past Questions | JAMB

Study the following Mathematics past questions and answers for JAMBWAEC  NECO and Post-JAMB. Get prepared with official past questions and answers for upcoming examinations.

16.  P(-6, 1) and Q(6, 6) are the two ends of the diameter of a given circle. Calculate the radius.

• A. 6.5 units
• B. 13.0 units
• C. 3.5 units
• D. 7.0 units

17.  The angle of a sector of s circle, radius 10.5cm, is 48°, Calculate the perimeter of the sector

• A. 8.8cm
• B. 25.4cm
• C. 25.6cm
• D. 29.8cm

18. Find the length of a side of a rhombus whose diagonals are 6cm and 8cm

• A. 8cm
• B. 5cm
• C. 4cm
• D. 3cm

19. Each of the interior angles of a regular polygon is 140°. How many sides has the polygon?

• A. 9
• B. 8
• C. 7
• D. 5

20. A cylinder pipe, made of metal is 3cm thick. If the internal radius of the pope is 10cm. Find the volume of metal used in making 3m of the pipe.

• A. 153πcm3
• B. 207πcm3
• C. 15300πcm3
• D. 20700πcm3

21. The locus of a point which moves so that it is equidistant from two intersecting straight lines is the?

• A. perpendicular bisector of the two lines
• B. angle bisector of the two lines
• C. bisector of the two lines
• D. line parallel to the two lines

22. 4, 16, 30, 20, 10, 14 and 26 are represented on a pie chart. Find the sum of the angles of the bisectors representing all numbers equals to or greater than 16

• A. 48o
• B. 84o
• C. 92o
• D. 276o

23. The mean of ten positive numbers is 16. When another number is added, the mean becomes 18. Find the eleventh number

• A. 3
• B. 16
• C. 38
• D. 30

24. Two numbers are removed at random from the numbers 1, 2, 3 and 4. What is the probability that the sum of the numbers removed is even?

• A. 2/3
• B. 2/15
• C. 1/2
• D. 1/4

25. Find the probability that a number selected at random from 41 to 56 is a multiply of 9

• A. 1/8
• B. 2/15
• C. 3/16
• D. 7/8

26. Musa borrows N10.00 at 2% per month simple interest and repays N8.00 after 4 months. How much does he still owe?

• A. N10.80
• B. N10.67
• C. N2.80
• D. N2.67

27.  Simplify 2log2/5  – log72/125 + log 9

• A. 1 – 4 log3
• B. -1 + 2 log 3
• C. -1 + 5 log2
• D. 1 – 2log 2

28.  A car travels from calabar to Enugu, a distance of P km with an average speed of U km per hour and continues to benin, a distance of Q km, with an average speed of Wkm per hour. Find its average speed from Calabar to Benin

• A. (\frac{(p + q)}{pw + qu}\)
• B. $$\frac{uw(p + q)}{pw + qu}$$
• C. $$\frac{uw(p + q)}{pw}$$
• D. $$\frac{uw}{pw + qu}$$

29. If w varies inversely as  uv / v+u and is equal to 8 when

u = 2 and v = 6, find a relationship between u, v, w.

• A. uvw = 16(u + v)
• B. 16uv = 3w(u + v)
• C. uvw = 12(u + v)
• D. 12uvw = u + v

30.  If g(x) = x2+ 3x  find g(x + 1) – g(x)

• A. (x + 2)
• B. 2(x + 2)
• C. (2x + 1)
• D. (x2 + 4)

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