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Physics
WAEC / WASSCE 2019
Heat Energy & Temperature
Which of the following quantities is a vector?
A
Volume
B
Momentum
C
Energy
D
Speed
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #58780)
Physics
WAEC / WASSCE 2019
Heat Energy & Temperature
Which of the following statements about a moving object is correct?
A
When accelerating, the resultant force acting on it must be equal to zero.
B
There must always be a non-zero resultant force acting on it.
C
At a steady velocity, the resultant force acting on it must be equal to zero
D
At a steady velocity, the air resistance must be equal to zero.
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: Myschool Past Questions Archive (Record #58822)
Physics
WAEC / WASSCE 2019
Heat Energy & Temperature
A freshly demagnetized bar magnet is placed in the East-West direction to ensure that
A
the molecular magnets remain randomly arranged.
B
the molecular magnets are properly aligned
C
it is affected by the earth's magnetic field
D
the magnetic domains are within the earth's field
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #58845)
Physics
WAEC / WASSCE 2019
Heat Energy & Temperature
A small amount of air is introduced into the vacuum above the mercury in a mercury barometer tube. The mercury level goes down because the air molecules
A
heat the mercury and make it expand
B
increase the pressure above the mercury.
C
cool the mercury and make it contract.
D
decrease the pressure above the mercury
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #58848)
Physics
WAEC / WASSCE 2019
Heat Energy & Temperature
An a.c. the generator can be converted to a d.c. generator by replacing the
A
commutator with an armature
B
armature with a commutator
C
commutator with slip rings
D
slip rings with a commutator
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #58915)
Physics
WAEC / WASSCE 2019
Heat Energy & Temperature
Diagram
Solution
The diagram above illustrates a meter bridge circuit underbalanced conditions. Determine the value of x.
Attached Figure / Diagram
A
50.cm
B
10.0 cm
C
28.6 cm
D
57.2 cm
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Using wheatstone bridge principle;
\(\frac{2}{x} = \frac{2}{(100 - x)}\)
2(100 - x) = 2 x \(x\)
200 = 2\(x + 2x\)
200 = 4x
x = \(\frac{200}{4}\)
= 50cm
Source: Myschool Past Questions Archive (Record #58941)
Physics
WAEC / WASSCE 2019
Heat Energy & Temperature
Solution
Which of the following liquids has the highest surface tension?
A
Soapy water
B
Cold water
C
Hot water
D
oily water
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Cold water has a higher surface tension than soapy water, hot water, and oily water. Soapy water has surfactants that reduce surface tension, while hot water has lower surface tension than cold water due to increased molecular motion. Oily water also has a lower surface tension than pure water.
Source: Myschool Past Questions Archive (Record #59026)
Physics
WAEC / WASSCE 2019
Heat Energy & Temperature
Solution
The nucleon and proton numbers of a neutral atom of an element are 238 and 92 respectively. Determine the number of neutrons in the atom.
A
119
B
330
C
165
D
146
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Neutron No (N) = 238 - 92
= 146
Source: Myschool Past Questions Archive (Record #59027)
Physics
UTME / JAMB 2019
Heat Energy & Temperature
Solution
Which of the following is consistent with Charles' law?
A
I
B
II
C
III
D
IV
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
This is the correct graph. The graph is volume against temperature where temperature is in Celsius.
Source: Official Exam / Past Question Archive
Physics
WAEC / WASSCE 2019
Heat Energy & Temperature
Solution
You are provided with a battery of e.m.f. E, a key K, a voltmeter, a standard resistor \(R_0\) = 2\(\Omega\), a resistance box R, and some connecting wires.
i. Measure and record the e.m.f. E of the battery.
i. Set up a circuit as shown in the diagram above with the key open.
iii. Set the resistance on the resistance box to R 22.
iv. Close the key, read and record the potential difference V on the voltmeter.
v. Evaluate V\(^{-1}\)
vi. Repeat the procedures for five other values of R = 5\(\Omega\) 10\(\Omega\),12\(\Omega\),15\(\Omega\) and 20\(\Omega\). In each case, record V and evaluate V\(^{-1}\)
vii. Tabulate the results.
viii. Plot a graph with R on the vertical axis and V\(^{-1}\) l on the horizontal axis, starting both axes from the origin (0,0).
ix. Determine the slope, s, of the graph and the intercept c on the vertical axis.
x. Calculate \(\propto\) and \(\beta\) from the equations s = \(R_0\) \(\propto\) and c= - (\(R_0\)+B).
xi. State two precautions taken to obtain accurate results.
A
Connecting wires
B
Earth wire
C
Fuse
D
Switch
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(R_0\) = 2\(\Omega\), emf of the battery = 2.0V
Table of value
S/N
R\(\Omega\)
V
V
1
2
3
4
5
6
2
5
10
12
15
20
4.70
2.40
1.75
1.40
1.10
0.76
0.214
0.417
0.571
0.714
0.909
1.320
Slope = \(\frac{\bigtriangleup R}{\bigtriangleup V^{-1}}\) = \(\frac{30.00-0.00}{1.50-0.15}\)
= \(\frac{30.00}{1.35}\) = 22
Intercept on the horizontal axis = 0.15
Calculation of \(\propto\)
\(\propto\) = \(\frac{S}{R_0} = \frac{22}{2}\) = 11
Calculation of \(\beta\)
\(\beta\) = -(\(R_0\) + C) = - (2 + 0.15) = -(2.15) = -2.15
Precuations
- Key opened in between reading/key opened when readings were not taken.
- Tight connections ensured
- Avoided parallax error when taking reading on voltmetre
- Repeated readings shown on table
- Noted/corrected zero error on voltmetre
- Clean terminals ensured.
(b) i. R\(_{AB}\) = \(\frac{4 \times 5}{4+5} = \frac{20}{9}\)
P\(_{AB}\) =\(\frac{V_{AB^2}}{R_{AB}}\)
= \(\frac{4^2 \times9}{20}\) = 7.2 W
ii. I = \(\frac{p}{v}\)=\(\frac{3.6\times10^3}{240}\)
= 15A
The breaker will not open since the current drawn (15A) is less than (20A).
Source: Official Exam / Past Question Archive
Physics
UTME / JAMB 2018
Heat Energy & Temperature
Diagram
Solution
The efficiency of energy conversion on the energy flow through a hydroelectric power is?
Attached Figure / Diagram
A
\(\frac{E1}{E2}\)
B
\(\frac{E3}{E2}\)
C
\(\frac{E2}{E1}\)+ E2
D
\(\frac{E2}{E3}\) + E1
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Efficiency = \(\frac{\text{useful energy output from machine}}{\text{energy input into machine}}\)
= \(\frac{E3}{E2}\)
Source: WAEC / JAMB / NECO Classroom Archive (Record #47742)
Physics
UTME / JAMB 2018
Heat Energy & Temperature
Shadows and eclipses result from the
A
refraction of light
B
reflection of light
C
defraction of light
D
rectilinear propagation of light
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #47390)
Physics
UTME / JAMB 2018
Heat Energy & Temperature
The pitch of an acoustic device can be increased by
A
decreasing the loudness
B
increasing the intensity
C
increasing the frequency
D
decreasing the intensity
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: Myschool Past Questions Archive (Record #47397)
Physics
UTME / JAMB 2018
Heat Energy & Temperature
One of the features of the fission process is that
A
it leads to chain reaction
B
its products are not radioactive
C
neutrons are not released
D
the of the masses of the reactants equals the sum of the masses of the products
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #47398)
Physics
UTME / JAMB 2018
Heat Energy & Temperature
Which of the following statements are TRUE of isotopes?
I. Isotopes of an element have the same chemical properties because they have the same number of electrons
II. Isotopes of elements are normally separated using physical properties
III. Isotopes of an element have the same number of protons in their nuclei
A
I and II only
B
I and III only
C
II and III only
D
I, II and III
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #47392)