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Physics
WAEC / WASSCE 2021
Heat Energy & Temperature
Solution
(a) You are provided with a battery, an ammeter, a voltmeter, a resistance box, a key and connection wires.
(i) Set up circuit as shown in the diagram above.
(ii) With the key opened, measure and record the e.m.f. E\(_o\) of the battery
(iii) With the key closed, select the resistance R=1 on the resistance box. Read and record the current, 1Ω.
(iv) Evaluate I\(^{-1}\).
(v) Repeat the procedure for five other values of R=2Ω,3Ω, 4Ω, 5Ω, and 6Ω.
In each case, record I and evaluate I\(^{-1}\) results.
(vii) Plot a graph with R on the vertical axis and I\(^{-1}\) on the horizontal axis.
(Viii) Determine the slope, s, of the graph.
(ix) Determine the intercept C, On the vertical axis.
(x) State two precautions taken to ensure accurate results.
(b)(i) Define potential difference in an electric field.
(ii) A piece of resistance wire of diameter 0.2 mm and length 25 cm has a resistance of 7Ω. Calculate the resistivity of the wire of the battery. [ \pi = 22\7]
A
Isaac Newton
B
Ernest Rutherford
C
Louis de Broglie
D
J.J. Thompson
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
SEE GRAPH ABOVE
(vii) Slope = \(\frac{\Deltad}{\DeltaI^{-1}}\) = \(\frac{d_2 - d_1}{I_2 - I^{-1}\)
→ \(\frac{80 - 30}{3.333 - 15}\} = \(\frac{50}{1.833}\)
Slope = 27.2cm / A
Precaution:
We should avoid parallax error by placing both eyes at the measured level.
We should always switch the fan off to ensure no external environment interferes with the result.
Diameter d = 0.6cm = 0.006m
: r = \(\frac{0.006}{2}\) = 0.003m
Resistivity = 1.0 x 10\(^{-6}\)
R = 4Ω
R = \(\frac{ρL}{A}|) → L = \(\frac{RA}{ρ}\)
L = \(\frac{ 4 x 22 x 0.0000009}{7 x 1.0 x 10^{-6}}\)
L = 6.289 x 2 x 9 x 10\(^{-6}\) x 10\(^{-6}\)
L = 113.14 x 10\(^{-6 + 6}\)
L = 113.14
Source: Official Exam / Past Question Archive
Physics
WAEC / WASSCE 2020
Heat Energy & Temperature
Solution
The length of an iron bar is 100cm at 20°C. At what temperature will its length increase by 0.01%? [Linear expansivity of iron = 1.2 x 10\(^{-5}\)°C]
A
48.0°C
B
38.0°C
C
28.3°C
D
23.0°C
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
GIVEN DATA:
where \DeltaL is the increase in length = 0.01
L1 is the initial length = 100
T1 = 20
T2 = ?
\alpha is the linear expansivity of iron = 1.2 x 10\(^{-5}\)^\circC
Formula
\DeltaL = L1\alpha\DeltaT
\DeltaT = \(\frac{\DeltaL}{L1\alpha}\)
\DeltaT is the change in temperature = T2 - T1
T2 = \(\frac{\DeltaL}{L1\alpha}\) + T1
T2 = \(\frac{0.01}{100 \times 1.2 x 10^{-5}}\) + 20
T2 = 8.3 + 20
T2 = 28.3
Source: WAEC / JAMB / NECO Classroom Archive (Record #59417)
Physics
UTME / JAMB 2020
Heat Energy & Temperature
Solution
If in a simple pendulum experiment the length of the inextensible string is increased by a factor of four, its period is increased by a factor of?
A
4
B
\(\frac{\pi}{2}\)
C
\(\frac{1}{4}\)
D
2
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
In a simple pendulum, T = 2\(\pi\)\(\sqrt{\frac{L}{g}}\)
\(\frac{T_1}{T_2} = \sqrt{\frac{L_1}{L_2}}\) but L\(_2\) = 4L\(_1\)
\(\frac{T_1}{T_2} = \sqrt{\frac{L_1}{4L_1}}\)
T\(_2\) = 2T\(_1\)
Source: Myschool Past Questions Archive (Record #56893)
Physics
UTME / JAMB 2020
Heat Energy & Temperature
Natural radioactivity consists of emission?
A
\(\alpha\)-particles and \(\beta\)-rays
B
\(\alpha\)-particles and X-rays
C
\(\gamma\)-ray and X-rays
D
\(\alpha\)-particles and \(\beta\)-rays and \(\gamma\)-rays
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 #56900)
Physics
UTME / JAMB 2020
Heat Energy & Temperature
Which of the following can be described as high tension transmission?
A
High resistance and low voltage
B
Low current and high voltage
C
High current and low voltage
D
High current and low resistance
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 #56902)
Physics
UTME / JAMB 2020
Heat Energy & Temperature
Tha mass of a proton is approximately equal to that of
A
an \(\alpha\)-particle
B
a \(\beta\)-Particle
C
a neutron
D
an electron
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 #56904)
Physics
UTME / JAMB 2020
Heat Energy & Temperature
Solution
One of the following readings represents the measurement of the length of a metal rod using vernier callipers. Taking the reading accuracy into consideration, the most likely one is
A
5.16cm
B
5.165cm
C
5.0cm
D
5.160cm
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Vernier Calipers Accuracy: Vernier calipers usually measure with an accuracy of 0.01 cm (0.1 mm), allowing for readings with two decimal places to ensure precision.
Hence, 5.16cm
Source: Myschool Past Questions Archive (Record #56907)
Physics
UTME / JAMB 2020
Heat Energy & Temperature
A hydrometer is an instrument for measuring the
A
a depth of water of water in a vessel
B
relative density of a liquid by the method of flotation
C
relative density of a liquid by finding the apparent loss in weight
D
relative humidity of the air
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 #56912)
Physics
UTME / JAMB 2020
Heat Energy & Temperature
Diagram
Solution
In the figure, the value of R is
Attached Figure / Diagram
A
3\(\Omega\)
B
6\(\Omega\)
C
4\(\Omega\)
D
5\(\Omega\)
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
R\(_T\) = \(\frac{V}{1} = \frac{12}{2}\) = 6\(\Omega\)
R\(_T\) = 3 + \(\frac{R \times 6}{R + 6}\)
R = 6\(\Omega\)
Source: Myschool Past Questions Archive (Record #56924)
Physics
UTME / JAMB 2020
Heat Energy & Temperature
Solution
A substance has half of 3 min. After 6 min, the count rate was observed to be 400. What was its count rate at zero time?
A
1600
B
1200
C
200
D
2400
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Let the count rate at zero time be N
N \(\frac{3 min}{\to}\) \(\frac{N}{2}\) \(\frac{3 min}{\to}\) \(\frac{N}{4}\)
\(\frac{N}{4}\)
= 400
N = \(\frac{400}{N/4}\) x N
= 1600
Source: Myschool Past Questions Archive (Record #56928)
Physics
WAEC / WASSCE 2020
Heat Energy & Temperature
How would the capacitance of a parallel plate capacitor be affected if the distance of separation of its plates is decreased? It will
A
increase in value
B
decrease slightly
C
remain unchanged
D
drop to zero
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 #59366)
Physics
WAEC / WASSCE 2020
Heat Energy & Temperature
The depolarising agent in a Leclanche cell is?
A
carbon rod
B
ammonium chloride
C
manganese (IV) oxide
D
zinc plate
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 #59370)
Physics
WAEC / WASSCE 2020
Heat Energy & Temperature
The material used to slow down the neutrons in a nuclear reactor is
A
boron
B
copper
C
graphite
D
uranium
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 #59371)
Physics
WAEC / WASSCE 2020
Heat Energy & Temperature
Which of the following statements explain why hot soapy water is more effective in cleaning oil-stained dishes?
A
The oil on the dishes repels the soap
B
soap and heat decrease the surface tension of oil
C
soap increases the surface tension of oil and water
D
Hot water increases the surface tension of oil
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 #59372)
Physics
WAEC / WASSCE 2020
Heat Energy & Temperature
A 60kg man stands on a weighing balance in an elevator. If the elevator accelerates upwards at 5ms\(^{-2}\), determine the reading of the scale. [g = 10ms\(^{-2}\)]
A
300N
B
600N
C
800N
D
900N
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 #59414)