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Physics
WAEC / WASSCE 2020
Heat Energy & Temperature
Which of the following statements about the motion of a simple pendulum is true?
A
It is a simple harmonic motion when the angle of displacement is large
B
It passes the equilibrium position with minimum speed
C
It possesses maximum kinetic energy at the extreme positions
D
lt swings faster at the poles than at the equator
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 #59462)
Physics
WAEC / WASSCE 2020
Heat Energy & Temperature
Which of the following statements about photoelectrons is correct?
A
A faint green light produces photoelectrons with less kinetic energy than a bright red light
B
A red light releases a smaller number of electrons than a green light
C
A faint green light produces photoelectrons with greater kinetic energy than a bright red light
D
A red light produces more photoelectrons than a green light
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 #59464)
Physics
WAEC / WASSCE 2020
Heat Energy & Temperature
A luminous object is one that
A
gives off dim blue-green light only in the dark.
B
gives out light of its own
C
shines by reflected light only
D
glows only in the presence of light
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 #59481)
Physics
WAEC / WASSCE 2020
Heat Energy & Temperature
Which of the following units is not fundamental?
A
Metre
B
Kilogram
C
Joule
D
Candela
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 #59482)
Physics
WAEC / WASSCE 2020
Heat Energy & Temperature
The vacuum between the double walls of a thermos flask reduces heat loss through
A
conduction and radiation
B
convection and conduction
C
radiation only
D
conduction only
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 #59484)
Physics
WAEC / WASSCE 2020
Heat Energy & Temperature
Solution
(a) In the design of an optical fibre, what type of material is most suitable for the design of the core?
(b) State one condition necessary to confine signals to the core of an optical fibre.
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
(a) Type of material most suitable for the design of the core of an optical fibre
- Glass/plasties
(b) Condition necessary confine signal to the core of an optical fibre
- The refractive index of the core must be greater than that of the cladding,
Source: Myschool Past Questions Archive (Record #59507)
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: Official Exam / Past Question Archive
Physics
WAEC / WASSCE 2020
Heat Energy & Temperature
Solution
You are provided with a resistance box R, voltmeter, key, cell of e.m.f. E, constantan wire, standard resistor, RX, an ammeter, and other necessary apparatus.
(i) Measure and record the e.m.f. E of the cell provided.
(ii) Set up the circuit as shown in the diagram above.
(iii) Set R to 1\(\Omega\). Close the key, read and record the current I and the corresponding voltage V.
(iv) Repeat the procedure for four other values of R= 2\(\Omega\), 4\(\Omega, 6\(\Omega\), and 8\(\Omega\).
(v) In each case, read and record I and V.
(vi) Tabulate the reading.
(vii) Plot a graph of V on the vertical axis and I on the horizontal axis.
(viii) Determine the slope s, of the graph.
(ix) State two precautions are taken to ensure accurate results
(b) )State two advantages of connecting identical cells in parallel.
(ii) State two factors to consider in choosing the material for the design of a resistor
A
depends on areas of the surfaces in contact
B
occurs in fluids
C
is independent of the relative velocity of the layers
D
depends on the tangential force between the layers
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
R(n)
I(A)
V(v)
1.0
2.0
4.0
6.0
8.0
0.40
0.35
0.28
0.22
0.18
0.65
0.58
0.22
0.45
0.40
E = 3.00v
(x) Precautions:
- Key opened in between readings/key opened when readings were not taken
- Ensuring tight connections Avoid parallax error when taking a reading on voltmeter/ammeter Repeated readings (shown on the table)
- Noted/corrected zero error on voltmetre/ammeter
- Clean terminals ensured
(b)Advantages of connecting identical cells in parallel produce a larger amount of current. supply steady current for a long period - efficiency is high
(ii) Factors to consider in choosing a material for the design of a resistor
- Power rating-Tolerance
- Voltage rating
-Temperature coefficient
- Noise
- Frequency response
- Stability
- Resistivity
Source: Official Exam / Past Question Archive
Physics
UTME / JAMB 2019
Heat Energy & Temperature
Solution
A metal rod has a length of 100cm at 200°C. At what temperature will its length be 99.4cm. If the linear expansivity of the material of the rod is 2 × 10\(^{-5}\)C\(^{-1}\)
A
\(300^0C\)
B
\(200^0C\)
C
\(100^0C\)
D
\(-100^0C\)
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
L\(_1\) = 100cm, T\(_1\) = 200^\circC
L\(_2\) = 99.4cm, T\(_2\) = ?
\alpha 2 \times 10\(^{-5}\) C\(^{-1}\)
\alpha
=
L\(_2\) - L\(_1\)
L\(_1\)(T\(_2\) - T\(_1\))
2
\times
10\(^{-5}\)
=
110 - 99.4
100(200 - T\(_2\))
=
0.6
100(200 - T\(_2\))
2 \times 10\(^{-5} \times 100(200 - T_2\)) = 0.6
200
-
T\(_2\)
=
0.6
0.002
=
300^\circC
T\(_2\) = 200 - 300 = -100^\circC
Source: WAEC / JAMB / NECO Classroom Archive (Record #55260)
Physics
WAEC / WASSCE 2019
Heat Energy & Temperature
Solution
Which of the following thermometers is used to measure the temperature of the human body?
A
Thermocouple
B
Alcohol-in-glass thermometer
C
Gas thermometer
D
Platinum resistance thermometer
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
The range of usefulness of the thermometer is set by the boiling point of the liquid used. In the case of the ethanol-filled thermometer, the upper limit for measurement is 78 ^\circC (172.4 ^\circF), which makes it useful for measuring daytime, nighttime and body temperatures, although not for anything much hotter than these.
Source: WAEC / JAMB / NECO Classroom Archive (Record #59023)
Physics
UTME / JAMB 2019
Heat Energy & Temperature
Solution
According to kinetic molecular model, in gases
A
The particles are closely packed together, they occupy minimum space & are usually arranged in a regular pattern
B
The particles occur in clusters with molecules slightly farther apart
C
The molecule are very fast apart & occupy all the space made available
D
The particle vibrate about fixed positions and are held together by the strong intermolecular bonds between them
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
In kinetic molecular model, gases are energized and thus moves freely, fast as they occupy specific space
Source: Myschool Past Questions Archive (Record #54973)
Physics
UTME / JAMB 2019
Heat Energy & Temperature
Solution
The value of T in the figure above is
A
30N
B
10.0N
C
20N
D
40N
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Tsin30 + Tsin30 =40
2Tsin30 = 40
Tsin30 = 40/2 = 20
T(\(\frac{1}{2}\)) = 20
T = 20 x 2 = 40N
Source: Myschool Past Questions Archive (Record #54981)
Physics
UTME / JAMB 2019
Heat Energy & Temperature
Solution
Electrons were discovered by
A
Dalton
B
James Charwick
C
J.J. Thompson
D
Niels Bohr
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Electron was discovered J.J Thompson in 1879
Source: Myschool Past Questions Archive (Record #54990)
Physics
UTME / JAMB 2019
Heat Energy & Temperature
Solution
The pin-hole camera produces a less sharply defined image when the
A
pin-hole is larger
B
illumination is less
C
screen is further from the pin-hole
D
object is further from the pin-hole
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
- a less sharp or blurred image is due to increased brightness
- increase brightness is also due to large hole or many pin holes
Source: Myschool Past Questions Archive (Record #55010)
Physics
UTME / JAMB 2019
Heat Energy & Temperature
Solution
The pitch of a screw jack is 0.45cm and the arm is 60cm long. If the efficiency of the Jack is 75/\pi %, calculate the mechanical advantage.
A
400
B
300
C
200
D
150
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
P = 0.45cm, L = 60cm, Eff = 75/\pi%
VR
(Screw
system)
=
2\pir
P
=
2\piL
P
M.A
=
Eff% \times VR
100
=
75
\pi
\times
1
100
\times
2\pi \times 60
0.45
=
75 \times 800
300
=
200
Source: Myschool Past Questions Archive (Record #55044)