Year : 
2017
Title : 
Mathematics (Core)
Exam : 
JAMB Exam

Paper 1 | Objectives

1 - 10 of 45 Questions

# Question Ans
1.

Given T = { even numbers from 1 to 12 }
N = {common factors of 6, 8 and 12}
Find T ∩ N

A. {2, 3}

B. {2, 3, 4}

C. {3, 4, 6}

D. {2}

Detailed Solution

T = {evenn numbers from 1 to 12}
N = {common factors of 6,8 and 12}
Find T ∩ N
T = {2, 4, 6, 8, 10, 12}
N = {2}
T ∩ N = {2} i.e value common to T & N
There is an explanation video available below.
2.

What is the next number in the series 2, 1, \(\frac{1}{2}\), \(\frac{1}{4}\)...

A. \(\frac{1}{3}\)

B. \(\frac{2}{8}\)

C. \(\frac{3}{7}\)

D. \(\frac{1}{8}\)

Detailed Solution

There is an explanation video available below.
3.

If U = {x : x is an integer and 1 ≤ x ≤ 20 }
E1 = {x: x is a multiple of 3}
E2 = {x: x is a multiple of 4} and an integer is picked at random from U, find the probability that it is not in E2

A. \(\frac{3}{4}\)

B. \(\frac{3}{10}\)

C. \(\frac{1}{4}\)

D. \(\frac{1}{20}\)

Detailed Solution

U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20}

E1 = {3, 6, 9, 12, 15, 18}

E2 = {4, 8, 12, 16, 20}

Probability of E2 = \(\frac{5}{20}\) i.e \(\frac{\text{Total number in}E_2}{\text{Entire number in set}}\)

Probability of set E2 = 1 − \(\frac{5}{20}\)

= \(\frac{15}{20}\)

= \(\frac{3}{4}\)
There is an explanation video available below.
4.

The curved surface area of a cylinder 5cm high is 110cm2. Find the radius of its base
π = \(\frac{22}{7}\)

A. 2.6cm

B. 3.5cm

C. 3.6cm

D. 7.0cm

Detailed Solution

There is an explanation video available below.
5.

If two graphs Y = px2 + q and y = 2x2 − 1 intersect at x =2, find the value of p in terms of q

A. q − \(\frac{8}{7}\)

B. 7 − \(\frac{q}{4}\)

C. 8 − \(\frac{q}{2}\)

D. 7 + \(\frac{q}{8}\)

Detailed Solution

There is an explanation video available below.
6.

Evaluate (\(\sin\)45º + \(\sin\)30º ) in surd form

A. \(\frac{\sqrt{3}}{2\sqrt{2}}\)

B. √3 − \(\frac{1}{2}\)

C. \(\frac{1}{2}\)√2

D. 1 + \(\frac{\sqrt{2}}{2}\)

Detailed Solution

hypotenuse
sin = \(\frac{1}{2}\)

\(\sin45 = \frac{1}{\sqrt{2}}\)

= \(\frac{2}{2}\)

∴ (sin45 + sin30)

= \(\frac{1}{\sqrt{2}} + \frac{1}{2}\)

= \(\frac{\sqrt{2}}{2}\) + \(\frac{1}{2}\)

= \(\frac{\sqrt{2} + 1}{2}\)

= \(\frac{1 + \sqrt{2}}{2}\)
There is an explanation video available below.
7.

If y = x Sin x, find \(\frac{dy}{dx}\) when x = \(\frac{\pi}{2}\)

A. \(\frac{- \pi}{2}\)

B. -1

C. 1

D. \(\frac{ \pi}{2}\)

Detailed Solution

y = xsinx

\(\frac{dy}{dx}\) = \(1 \sin x + x \cos x\)

= \(\sin x + x \cos x\)

At x = \(\frac{\pi}{2}\)

= sin\(\frac{\pi}{2}\) + \(\frac{\pi}{2} \cos {\frac{\pi}{2}}\)

= 1 + \(\frac{\pi}{2}\) × 0

= 1
There is an explanation video available below.
8.

If temperature t is directly proportional to heat h, and when t = 20oC, h = 50 J, find t when h = 60J

A. 24oC

B. 20oC

C. 34oC

D. 30oC

Detailed Solution

There is an explanation video available below.
9.

Evaluate 1 - (\(\frac{1}{5}\) x \(\frac{2}{3}\)) + ( 5 + \(\frac{2}{3}\))

A. 4

B. 3

C. 2\(\frac{2}{3}\)

D. \(\frac{98}{15}\)

Detailed Solution

There is an explanation video available below.
10.

Given m = N\(\sqrt{\frac{SL}{T}}\) make T the subject of the formula

A. \(\frac{\text{NSL}}{M}\)

B. \(\frac{N^2SL}{M^2}\)

C. \(\frac{N^2SL}{M}\)

D. \(\frac{NSL}{M^2}\)

Detailed Solution

M = N \(\sqrt{\frac{SL}{T}}\),

make T subject of formula square both sides

M\(^{2}\) = \(\frac{N^2SL}{T}\)

TM\(^{2}\) = N\(^{2}\)SL

T = \(\frac{N^2SL}{M^2}\)
There is an explanation video available below.
1.

Given T = { even numbers from 1 to 12 }
N = {common factors of 6, 8 and 12}
Find T ∩ N

A. {2, 3}

B. {2, 3, 4}

C. {3, 4, 6}

D. {2}

Detailed Solution

T = {evenn numbers from 1 to 12}
N = {common factors of 6,8 and 12}
Find T ∩ N
T = {2, 4, 6, 8, 10, 12}
N = {2}
T ∩ N = {2} i.e value common to T & N
There is an explanation video available below.
2.

What is the next number in the series 2, 1, \(\frac{1}{2}\), \(\frac{1}{4}\)...

A. \(\frac{1}{3}\)

B. \(\frac{2}{8}\)

C. \(\frac{3}{7}\)

D. \(\frac{1}{8}\)

Detailed Solution

There is an explanation video available below.
3.

If U = {x : x is an integer and 1 ≤ x ≤ 20 }
E1 = {x: x is a multiple of 3}
E2 = {x: x is a multiple of 4} and an integer is picked at random from U, find the probability that it is not in E2

A. \(\frac{3}{4}\)

B. \(\frac{3}{10}\)

C. \(\frac{1}{4}\)

D. \(\frac{1}{20}\)

Detailed Solution

U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20}

E1 = {3, 6, 9, 12, 15, 18}

E2 = {4, 8, 12, 16, 20}

Probability of E2 = \(\frac{5}{20}\) i.e \(\frac{\text{Total number in}E_2}{\text{Entire number in set}}\)

Probability of set E2 = 1 − \(\frac{5}{20}\)

= \(\frac{15}{20}\)

= \(\frac{3}{4}\)
There is an explanation video available below.
4.

The curved surface area of a cylinder 5cm high is 110cm2. Find the radius of its base
π = \(\frac{22}{7}\)

A. 2.6cm

B. 3.5cm

C. 3.6cm

D. 7.0cm

Detailed Solution

There is an explanation video available below.
5.

If two graphs Y = px2 + q and y = 2x2 − 1 intersect at x =2, find the value of p in terms of q

A. q − \(\frac{8}{7}\)

B. 7 − \(\frac{q}{4}\)

C. 8 − \(\frac{q}{2}\)

D. 7 + \(\frac{q}{8}\)

Detailed Solution

There is an explanation video available below.
6.

Evaluate (\(\sin\)45º + \(\sin\)30º ) in surd form

A. \(\frac{\sqrt{3}}{2\sqrt{2}}\)

B. √3 − \(\frac{1}{2}\)

C. \(\frac{1}{2}\)√2

D. 1 + \(\frac{\sqrt{2}}{2}\)

Detailed Solution

hypotenuse
sin = \(\frac{1}{2}\)

\(\sin45 = \frac{1}{\sqrt{2}}\)

= \(\frac{2}{2}\)

∴ (sin45 + sin30)

= \(\frac{1}{\sqrt{2}} + \frac{1}{2}\)

= \(\frac{\sqrt{2}}{2}\) + \(\frac{1}{2}\)

= \(\frac{\sqrt{2} + 1}{2}\)

= \(\frac{1 + \sqrt{2}}{2}\)
There is an explanation video available below.
7.

If y = x Sin x, find \(\frac{dy}{dx}\) when x = \(\frac{\pi}{2}\)

A. \(\frac{- \pi}{2}\)

B. -1

C. 1

D. \(\frac{ \pi}{2}\)

Detailed Solution

y = xsinx

\(\frac{dy}{dx}\) = \(1 \sin x + x \cos x\)

= \(\sin x + x \cos x\)

At x = \(\frac{\pi}{2}\)

= sin\(\frac{\pi}{2}\) + \(\frac{\pi}{2} \cos {\frac{\pi}{2}}\)

= 1 + \(\frac{\pi}{2}\) × 0

= 1
There is an explanation video available below.
8.

If temperature t is directly proportional to heat h, and when t = 20oC, h = 50 J, find t when h = 60J

A. 24oC

B. 20oC

C. 34oC

D. 30oC

Detailed Solution

There is an explanation video available below.
9.

Evaluate 1 - (\(\frac{1}{5}\) x \(\frac{2}{3}\)) + ( 5 + \(\frac{2}{3}\))

A. 4

B. 3

C. 2\(\frac{2}{3}\)

D. \(\frac{98}{15}\)

Detailed Solution

There is an explanation video available below.
10.

Given m = N\(\sqrt{\frac{SL}{T}}\) make T the subject of the formula

A. \(\frac{\text{NSL}}{M}\)

B. \(\frac{N^2SL}{M^2}\)

C. \(\frac{N^2SL}{M}\)

D. \(\frac{NSL}{M^2}\)

Detailed Solution

M = N \(\sqrt{\frac{SL}{T}}\),

make T subject of formula square both sides

M\(^{2}\) = \(\frac{N^2SL}{T}\)

TM\(^{2}\) = N\(^{2}\)SL

T = \(\frac{N^2SL}{M^2}\)
There is an explanation video available below.