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Mathematics
WAEC / WASSCE 2021
Statistics (Data Representation, Central Tendency & Dispersion)
Solution
find the first quartile of 7,8,7,9,11,8,7,9,6 and 8.
A
8.5
B
7.0
C
7.5
D
8.0
medium Difficulty
Verified Correct Answer: Option B
Step-by-Step Mathematical Solution
Rearrange data in increasing order: 6,7,7,7,8,8,8,9,9 and 11
First quartile (ungrouped data) = \(\frac{n + 1}{4}\)th value
= \(\frac{11}{4}\)
= 2.75th value
= \(\frac{7 + 7}{2}\)
= 7.0
Source: WAEC / JAMB / NECO Classroom Archive (Record #61424)
Mathematics
WAEC / WASSCE 2021
Statistics (Data Representation, Central Tendency & Dispersion)
Solution
Height(cm)
160
161
162
163
164
165
No. of players
4
6
3
7
8
9
the table shows the height of 37 players of a basketball team calculates correct to one decimal place the mean height of the players.
A
163.0
B
162.0
C
160.0
D
165.0
medium Difficulty
Verified Correct Answer: Option A
Step-by-Step Mathematical Solution
∑fx = (160 * 4) + (161 * 6) + (162 * 3) + (163 * 7) + (164 * 8) + (165 * 9)
=640 + 966 + 486 + 1,141 + 1,312 + 1,485
= 6,030
∑f = 4 + 6 + 3 + 7 + 8 + 9
= 37
= \(\frac{∑fx}{∑f}\)
= \(\frac{6030}{37}\)
= 162.97 or 163
Source: WAEC / JAMB / NECO Classroom Archive (Record #61430)
Mathematics
WAEC / WASSCE 2021
Statistics (Data Representation, Central Tendency & Dispersion)
Diagram
Solution
The pie chart represents the distribution of fruits on display in the shop if there are 60 apples on display how many oranges are there?
Attached Figure / Diagram
A
80
B
270
C
120
D
90
medium Difficulty
Verified Correct Answer: Option D
Step-by-Step Mathematical Solution
Total angles = 360^\circ
100 + 60 + 80 + M = 360
M = 360 - 240 = 120
Orange (M) = 120^\circ and F ( fruits in total)
For Apples:
\(\frac{80}{360} \times F\) = 60
F = \(\frac{60 \times 360}{80}\)
F = 270 fruits in total
For Orange
= \(\frac{120}{360} \times 270\)
= 90 oranges
Source: WAEC / JAMB / NECO Classroom Archive (Record #61461)
Mathematics
UTME / JAMB 2021
Statistics (Data Representation, Central Tendency & Dispersion)
Solution
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
medium Difficulty
Verified Correct Answer: Option D
Step-by-Step Mathematical Solution
Given that 4, 16, 30, 20, 10, 14 and 26
Adding up = 120
nos \(\geq\) 16 are 16 + 30 + 20 + 26 = 92
The requires sum of angles = \(\frac{92}{120}\) x \(\frac{360^o}{1}\)
= 276o
Source: WAEC / JAMB / NECO Classroom Archive (Record #60699)
Mathematics
UTME / JAMB 2021
Permutations, Combinations & Probability
Solution
Find the probability that a number selected at random from 41 to 56 is a multiple of 9
A
\(\frac{1}{8}\)
B
\(\frac{2}{15}\)
C
\(\frac{3}{16}\)
D
\(\frac{7}{8}\)
medium Difficulty
Verified Correct Answer: Option A
Step-by-Step Mathematical Solution
Given from 41 to 56
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56
The nos multiple of 9 are: 45, 54
P(multiple of 9) = \(\frac{2}{16}\)
= \(\frac{1}{8}\)
Source: WAEC / JAMB / NECO Classroom Archive (Record #60704)
Mathematics
WAEC / WASSCE 2021
Permutations, Combinations & Probability
Solution
A fair die is tossed twice what is the probability of get a sum of at least 10.
A
\(\frac{5}{36}\)
B
\(\frac{2}{3}\)
C
\(\frac{5}{18}\)
D
\(\frac{1}{6}\)
medium Difficulty
Verified Correct Answer: Option D
Step-by-Step Mathematical Solution
\(\begin{array}{c|c}
& 1 & 2 & 3 & 4 & 5 & 6 \\
\hline
1 & 1,1 & 1,2 & 1,3 & 1,4 & 1,5 & 1,6 \\ \hline 2 & 2,1 & 2,2 & 2,3 & 2,4 & 2,5 & 2,6 \\ \hline 3 & 3,1 & 3,2 & 3,3 & 3,4 & 3,5 & 3,6 \\ \hline 4 & 4,1 & 4,2 & 4,3 & 4,4 & 4,5 & 4,6 \\ 5 & 5,1 & 5,2 & 5,3 & 5,4 & 5,5 & 5,6 \\ \hline 6 & 6,1 & 6,2 & 6,3 & 6,4 & 6,5 & 6,6\end{array}\)
From the table above, event space, n(E) = 6
sample space, n(S) = 36
Hence, probability sum of scores is at least 10, is;
\(\frac{n(E)}{n(S)}\)
= \(\frac{6}{36}\)
= \(\frac{1}{6}\)
Source: WAEC / JAMB / NECO Classroom Archive (Record #61463)
Physics
UTME / JAMB 2021
Calorimetry, Latent Heat & Change of State
Solution
Calculate the mass of ice that would melt when 2kg of copper is quickly transferred from boiling water to a block of ice without heat loss (specific heat capacity of copper = 400Jkg\(^{1}\)k\(^{-1}\), latent heat of fusion of ice = 3.3 x 10\(^{5}\)Jkg\(^{-1}\))
A
\(\frac{8}{33}\)kg
B
\(\frac{3.3}{80}\)kg
C
\(\frac{80}{33}\)kg
D
\(\frac{3.3}{8}\)kg
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
mc\(\Delta\theta\) = m\(\lambda\)\(_f\)
2 x 400 (100 - 0) = m(3.3 x 10\(^{5}\))
m = \(\frac{2 \times 400 \times 100}{3.3 \times 10^{5}} = \frac{8}{33}\)kg
Source: WAEC / JAMB / NECO Classroom Archive (Record #60780)
Physics
WAEC / WASSCE 2021
Calorimetry, Latent Heat & Change of State
A metallic sphere is heated from 27°C to 200°C Without change of state. Which of the following changes would have resulted from the heating?
A
No changes occur in its volume and density
B
Its volume increases and its density increases
C
Its volume increases and its density decrease
D
Its volume increases without a change in density
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: WAEC / JAMB / NECO Classroom Archive (Record #61896)
Physics
UTME / JAMB 2021
Circular Motion, Gravitation & Simple Harmonic Motion
Solution
Particles of mass 10\(^{-2}\)kg is fixed to the tip of a fan blade which rotates with angular velocity of 100rad\(^{-1}\). If the radius of the blade is 0.2m, the centripetal force is?
A
2N
B
20N
C
200N
D
400N
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Given
m = 10\(^{-2}\)
w = 100rads\(^{-1}\)
F = mw\(^{2}\)r
r = 0.2m
F = ?
= 10\(^{-2}\) x (100)\(^{2}\) x 0.2
= 20N
Source: WAEC / JAMB / NECO Classroom Archive (Record #60752)
Physics
WAEC / WASSCE 2021
Circular Motion, Gravitation & Simple Harmonic Motion
Solution
A ball is swung in a horizontal circle of centre O with a constant speed. What is the direction of its acceleration?
A
Away from O
B
Along the Circumference of the circle
C
Toward centre O
D
Along a tangent to the circle
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Simple harmonic motion (SHM) is a special type of periodic motion where the restoring force on the moving object is directly proportional to the magnitude of the object's displacement and acts towards the object's equilibrium position.
Source: WAEC / JAMB / NECO Classroom Archive (Record #61906)
Physics
UTME / JAMB 2021
Work, Energy, Power & Simple Machines
Solution
A ball of mass 0.1kg is thrown vertically upwards with a speed of 10ms\(^{-1}\) from the top of a tower 10m high. Neglecting air resistance, its total energy just before hitting the ground is? (Take g = 10ms\(^{-2}\))
A
5J
B
10J
C
15J
D
20J
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Givn
m = 0.1kg
u = 10ms\(^{-1}\)
h = 10m
g = 10ms\(^{-2}\)
At h\(_{max}\); v = 0
Using
\(\not v\) = \(\not u\) = \(\not gt\)
\(\not 0\) = \(\not w\) - \(\not 10t\)
v\(^{2}\) = u\(^{2}\) - 2gh
0\(^{2}\) = 10\(^{2}\) - 2 x 10h
20h = 100
h = 5m
Total height = 10 + 5
= 15m
Total energy = mghr = 0.1 x 10 x1 5
= 15J
Source: WAEC / JAMB / NECO Classroom Archive (Record #60754)
Physics
WAEC / WASSCE 2021
Work, Energy, Power & Simple Machines
Solution
A man weighing 200 N runs up a staircase in 5s. If the height of the staircase is 9 m, calculate the power of the man.
A
1000 W
B
360 W
C
40 W
D
1800 W
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
power = \(\frac{force * distance}{time}\) → \(\frac{200 * 9}{5}\)
power = 36w
Source: WAEC / JAMB / NECO Classroom Archive (Record #62301)
Physics
UTME / JAMB 2021
Linear Motion, Projectiles & Kinematics
Solution
The slope of the straight line displacement-time graph indicates?
A
distance traveled
B
uniform velocity
C
uniform acceleration
D
uniform speed
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(\frac{\bigtriangleup s}{\bigtriangleup t}\) = uniform velocity
Source: WAEC / JAMB / NECO Classroom Archive (Record #60560)
Physics
UTME / JAMB 2021
Linear Motion, Projectiles & Kinematics
Solution
Two bodies have masses in the ratio3:1. They experience forces which impart to them, acceleration in the ratio 2:9 respectively. Find the ratio of forces the masses experienced
A
1:4
B
2:1
C
2:3
D
2:5
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Given \(\frac{m_{1}}{m_{2}} = \frac{3}{1}\) \(\Rightarrow\) \(m_1\) = 3\(m_2\)
\(\frac{a_{1}}{a_{2}} = \frac{2}{9}\) = \(a_1\) = \(\frac{2a_{2}}{9}\)
\(\frac{F_{1}}{F_{2}}\) = ?
Since F = ma
\(\Rightarrow\) \(\frac{F_{1}}{F_{2}} = \frac{m_{1}a_{1}}{m_{2}a_{2}}\) = \(\frac{(3 \not m_{2})(2 \not a_{2})}{\not m_{2} a_{2} \not a_{3}}\)
\(\frac{F_{1}}{F_{2}} = \frac{2}{3}\) \(\Rightarrow\) 2:3
Source: WAEC / JAMB / NECO Classroom Archive (Record #60751)
Physics
WAEC / WASSCE 2021
Linear Motion, Projectiles & Kinematics
Diagram
Solution
The diagram above illustrates the velocity-time graph of a body. Calculate the distance covered by the body during the motion
Attached Figure / Diagram
A
15m
B
84m
C
72m
D
48m
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Distance covered = Area under the graph
D = area of square + area of trapezium
D = L x L + 1/2(a+b)h
D = 4 x 4 + 1/2( 4+ 10)8
D = 16 + 1/2 x 14 x 8
D = 16 + 56
D = 72m.
Source: WAEC / JAMB / NECO Classroom Archive (Record #61903)