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Physics
UTME / JAMB 2012
Heat Energy & Temperature
The p-n junction diodes can act as rectifiers because they
A
conduct current when forward-biased
B
conduct current when reverse-biased
C
block current when forward-biased
D
conduct current in both directions
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 #27425)
Physics
WAEC / WASSCE 2012
Heat Energy & Temperature
The movement of fluid up or down a narrow tube is
A
osmosis
B
brownian motion
C
capillarity
D
diffusion
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 #35527)
Physics
WAEC / WASSCE 2012
Heat Energy & Temperature
Solution
A bird flies at 10ms\(^{-1}\) for 3s, 15ms\(^{-1}\) for 3s and 20 ms\(^{-1}\) for 4s. Calculate the bird's average speed
A
4.5 ms-1
B
15.0 ms-1
C
15.5 ms-1
D
51.7 ms-1
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Av. speed = \(\frac{3 \times 15 + 3 \times 10 + 4 \times 20}{3 + 3 + 4}\)
= 15.5 ms\(^{-1}\)
Source: Myschool Past Questions Archive (Record #35529)
Physics
WAEC / WASSCE 2012
Heat Energy & Temperature
Solution
A simple pendulum makes 50 oscillations in one minute. Determine its period of oscillation
A
0.02s
B
0.83s
C
1.20s
D
50.00s
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
T = \(\frac{t}{n} = \frac{60}{50} = 1.2\)
Source: Myschool Past Questions Archive (Record #35555)
Physics
WAEC / WASSCE 2012
Heat Energy & Temperature
A girl stands on a scale in a lift. If the reading on the scale is less than her weight, then the lift is moving
A
upward at uniform speed
B
upward with uniform acceleration
C
downward with uniform speed
D
downward with uniform acceleration
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 #35559)
Physics
WAEC / WASSCE 2012
Heat Energy & Temperature
The thermopile is a device for detecting
A
radioactive radiations
B
radiant energy
C
x-rays
D
the presence of electrons
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 #35567)
Physics
WAEC / WASSCE 2012
Heat Energy & Temperature
Solution
In the formation of sea breeze. wind blows from
A
sky to land
B
sea to sky
C
land to sea
D
sea to land
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
A sea breeze describes a wind that blows from the ocean (sea) inland towards land.
Source: Myschool Past Questions Archive (Record #35568)
Physics
WAEC / WASSCE 2012
Heat Energy & Temperature
A telescope is said to be in normal adjustment when the
A
focal length of he objective is greater than that of the eyepiece
B
focal length of the eyepiece is greater than that of the objective
C
focal length of the eyepiece is equal to that of the objective
D
objective focal point coincides wih that of the eyepiece
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 #35602)
Physics
WAEC / WASSCE 2012
Heat Energy & Temperature
An atom in an excited state is one whose
A
potential energy is minimum
B
potential energy is maximum
C
electron are in the conduction band
D
electron have moved to higher energy level
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 #35641)
Physics
WAEC / WASSCE 2012
Heat Energy & Temperature
Which of the following properties is an advantage of lead-acid accumulator over an alkaline accumulator?
A
possesses low internal resistance
B
can be recharges
C
has shorter life span
D
possesses high e.m.f
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 #35614)
Physics
WAEC / WASSCE 2012
Heat Energy & Temperature
Solution
You are provided with a potentiometer, an ammeter, a voltmeter, a standard resistor, and other necessary apparatus. Using the circuit diagram above as a guide carry out the following instructions.
Set up a circuit as illustrated in the diagram above.
Close the key, K.
Read and record the ammeter reading \(l_o\) and the voltmeter reading \(V_o\) when jockey J is not making contact with the potentiometer wire OQ.
Using J, make a contact with the potentiometer wire OQ at a point P such that OP = 1Ocm.
Read and record the current and the corresponding value of the voltage V.
Repeat the procedure for other values of OP= 20cm, 30cm, 40cm, 50cm, and 60cm.
Tabulate your readings.
Plot a graph with V on the vertical axis and I on the horizontal axis, starting both axes from the origin (0, 0).
Determine the slope, s, of the graph.
Determine the value of V when I = 0.
State two precautions taken to obtain accurate results.
(b) i. State two advantages of a lead-acid accumulator over a dry Leclanche cell.
ii. A cell of emf 2V and internal resistance of 1\(\Omega\) passes current through an external load of 9\(\Omega\). Calculate the potential drop across the cell.
A
5.8A
B
6.9A
C
30.0A
D
33.3A
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
S/N
OP(\(_{cm}\))
I(\(_{A}\))
V(\(_{v}\))
1
20.0
0.13
1.08
2
30.0
0.14
0.97
3
40.0
0.15
0.85
4
50.0
0.16
0.74
5
60.0
0.17
0.60
Slope, s = \(\frac{y_{2} - y_{1}}{x_{2} - x _{1}} = \frac{0.85 - 0.30}{0.20 - 0.5}\)
\(\frac{0.55}{0.05}\)
= 11
When I = o
V = 3.15v
Precautions; i
- ensured that the key was open whenever the circuit was not in use so as to avoid the cells being run down.
- ensured there was no zero error in the ammeter and the voltmeter by making necessary adjustments before taking my readings.
- ensured that the jockey did not scrap the potentiometer wire.
- ensured that the electrical wires were tightly connected to the terminals in order to avoid current fluctuations.
(b)i.
Lead-acid accumulator
Leclanche cell
(i). It has the capacity to supply large current for a long time
(ii). It can be charged
It has no such capacity
It cannot be recharged
ii. e.m.f = 2V
r = 1\(\Omega\) (internal resistance)
R = 9\(\Omega\) (external resistance)
Calculate the potential drop across the cell.
By formula;
E = I(R +r)
2 = I(9 + 1)
2 = 101
I = \(\frac{2}{10}\) = 0.2A
Therefore, the p.d drop across the cell is Ir.
= 0.2 x 1 = 0.2V
Source: Official Exam / Past Question Archive
Physics
WAEC / WASSCE 2012
Heat Energy & Temperature
Diagram
Solution
In the diagram illustrated, a body of mass m slides on an inclined plane. Show that the coefficient M\(_g\) of friction between the surfaces in contact is tan \(\theta\).
Attached Figure / Diagram
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
(1) If F = uniform speed of body
\(\mu = \frac{F}{R} = \frac{Mg sin \theta}{Mg cos \theta} = tan \theta\)
Source: Myschool Past Questions Archive (Record #53210)
Physics
UTME / JAMB 2011
Heat Energy & Temperature
Solution
If it takes an object 3s to fall freely to the ground from a certain height, what is the distance covered by the object?
A
90 m
B
30 m
C
45 m
D
60 m
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
S = (1)/2gt2
S = (1)/2 x (10)/1 x 32 =5 x 9 = 45 m
Source: Myschool Past Questions Archive (Record #14351)
Physics
UTME / JAMB 2011
Heat Energy & Temperature
Solution
If a tube of small radius opened at both ends is placed in a liquid, the liquid will
A
remain at the same level irrespective of whether the liquid wet the glass or not
B
fall below the liquid level if the liquid wets the glass
C
falls below the liquid level if the liquid does not wet the glass
D
rise above the liquid level if the liquid does not wet the glass
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
The liquid will rise up the capillary if it wets glass and falls below its wets glass and falls below its initial level if it does not wet glass
Source: Myschool Past Questions Archive (Record #14355)
Physics
UTME / JAMB 2011
Heat Energy & Temperature
Solution
An object weighs 22 kg in water and 30kg in air. what is the upthrust exerted by the liquid on the object.
[g = 10 ms2]
A
50 N
B
520 N
C
220 N
D
80 N
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
upthrust = weight in air - weight in liquid = 30 x 10 - 22 x 10 = 300 - 220 = 80 N
Source: Myschool Past Questions Archive (Record #14359)