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Physics
WAEC / WASSCE 2015
Heat Energy & Temperature
Solution
An object floats in a fluid when it displaces it's
A
volume of liquid in which it floats
B
mass of fluid in which it foats
C
weith of fluid in which it foats
D
density of fluid in which it foats
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
A floating object displaces a weight of fluid equal to its own weigh
Source: Myschool Past Questions Archive (Record #45419)
Physics
WAEC / WASSCE 2015
Heat Energy & Temperature
Which of the following statements describes a body in a stable equilibrium correctly?
A
a person walking on a tight-rope
B
ball on a smooth horizontal table
C
ball resting on an inverted hemisphere bowl
D
ball in the middle of a nemispherical bowl
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 #45425)
Physics
WAEC / WASSCE 2015
Heat Energy & Temperature
Solution
In a school compound a girl walks 40m due east from the laboratory to the staff room to submit her report. Then she returns and walks 30m due north to her classroom. Determine the magnitude of her displacement from the10m laboratory
A
10m
B
35m
C
50m
D
70m
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
East (\(x\)): 40 m, North (\(y\)): 30 m
displacement: \(\sqrt{40^{2}+30^{2}}\)
= \(\sqrt{1600 + 900} = \sqrt{2500} = 50\)m.
Source: Myschool Past Questions Archive (Record #45427)
Physics
WAEC / WASSCE 2015
Heat Energy & Temperature
Two strings each inclined at an angle 30o to the horizontal are used to hold a bucket of water weighing 20N. Calculate the tension i n each string.
A
20 (\sqrt{3}\)N
B
20N
C
10 (\sqrt{3}\)N
D
10N
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 #45438)
Physics
WAEC / WASSCE 2015
Heat Energy & Temperature
Solution
A uniform bar AB is balanced on a knife-edge which is 60cm from B by a mass of 22g which hangs at C 10cm from A. Calculate the mass of the bar.
A
133.2g
B
66.0g
C
60.0g
D
22.0g
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
clockwise movement = anticlockwise movement
w x 10 = 22 x 30
w = \(\frac{22 \times 30}{10}\)
w = 66.0g
Source: Myschool Past Questions Archive (Record #45443)
Physics
WAEC / WASSCE 2015
Heat Energy & Temperature
The crackling noise produced by aluminum roofing sheets on a house during a hot sunny day is a result of
A
thermal equilibrium of the sheets
B
conduction of heat by the sheets
C
contraction of the sheets
D
expansion of the sheets
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 #45445)
Physics
WAEC / WASSCE 2015
Heat Energy & Temperature
Solution
A swimming pool is 2.1m deep. If it contains water of refractive index 1.3, calculate the apparent depth of pool
A
3.4m
B
2.7m
C
1.6m
D
0.8m
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
n = \(\frac{\text{real depth}}{\text{apparent depth}}\)
1.3 = \(\frac{2.1}{\text{apparent}}\)
A.D = \(\frac{2.1}{1.3} = 1.6\)
Source: Myschool Past Questions Archive (Record #45472)
Physics
WAEC / WASSCE 2015
Heat Energy & Temperature
Which of the following concepts is a method of heat transfer that does not require a material medium?
A
conduction
B
radiation
C
diffusion
D
convection
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 #45457)
Physics
WAEC / WASSCE 2015
Heat Energy & Temperature
Diagram
Solution
The diagram above illustrates a block ans tackle pulley system in which an effort E supports a load of 100.0N. If the efficiency of the machine is 75%, calculate the value of E
Attached Figure / Diagram
A
22.2N
B
38.0N
C
67.0N
D
75.0N
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Given; VR = 6, e = 75%, MA = ?
e = \(\frac{\text{MA}}{\text{VR}} \times \frac{100}{1}\)
MA =\(\frac{75 \times 6}{10}\)
MA = \(\frac{9}{2}\)
MA = \(\frac{L}{E} = \frac{100}{E}\)
\(\frac{9}{2} = \frac{100}{E}\)
9E = 100
E = \(\frac{200}{9}\)
= 22.2N
Source: Myschool Past Questions Archive (Record #45449)
Physics
WAEC / WASSCE 2015
Heat Energy & Temperature
Which of the following statements is correct? When capacitors of different values are connected in series
A
the same charge flows through them
B
the same voltage appears across each capacitor
C
different quantities of charges flow through them in different voltages across them
D
different quantities of charges flows through them with the same voltage across them
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 #45547)
Physics
WAEC / WASSCE 2015
Heat Energy & Temperature
Which of the following statements about a three-pin plug is/are correct. i. The brown wire is the live wire. ii. The fuse is connected to the live wire. iii. The earth wire is coloured blue
A
i only
B
ii only
C
i and ii only
D
i, ii and iii
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 #45548)
Physics
WAEC / WASSCE 2015
Heat Energy & Temperature
Which of the following statements about diode is correct?
A
reverse bias diodes have low resistance
B
forward bias diodes have high resistance
C
forward bias diodes produce high current
D
forward bias diodes function as a result of heat
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 #45569)
Physics
WAEC / WASSCE 2015
Heat Energy & Temperature
Solution
Two angles of a pentagon are in the ratio 2:3. The others are 60o each. Calculate the smaller of the two angles
A
72o
B
100o
C
120o
D
144o
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
The diagram given simple illustrates that a pentagon contains three \(\Delta\)s.
Two angles which are in the ratio 2:3 will have actual values 2xo, 3xo respectively. Thus 2xo + 3xo + 3 x 60 = 3x sum of angles of \(\Delta\)a
i.e. 5xo + 180o = 3 x 180o
5xo + 180o = 540o
5xo = 540o - 180o
5xo = 360o
xo = \(\frac{360^o}{5}\)
= 72o
Hence, the smaller of the two angles is
2 x 72o = 144o
Source: Myschool Past Questions Archive (Record #45995)
Physics
WAEC / WASSCE 2015
Heat Energy & Temperature
Solution
You have been provided with a resistance box, a voltmeter, a key, a battery, and other necessary materials.
Connect the circuit as shown in the diagram above.
With the key K closed, read and record the voltmeter reading \(V_0\).
Set the resistance R in the resistance box equal to I\(\Omega\).
Close the key, read and record the potential difference V on the voltmeter.
EvaluateR\(^{-1}\) and V\(^{-1}\) .
Repeat the procedure for five other values or R = 2\(\Omega\), 3\(\Omega\), 4\(\Omega\), 5\(\Omega\) and 6\(\Omega\).
Tabulate your readings.
Plot a graph with V\(^{-1}\) on the vertical axis and R on the horizontal axis.
Determine the slope, s, of the graph and the intercept, C, on the vertical axis.
Evaluate c\(^{-1}\)
State two precautions taken to obtain accurate results.
(b)i. Define the potential difference between two points in an electric circuit.
ii. Explain why the emf of a cell is greater than the p.d. across the call when it is supplying Current through an external resistance.
A
72o
B
100o
C
120o
D
144o
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
S/N
R/W
V/vat
R\(^{-1}\)/W\(^{-1}\)
V\(^{-1}\)/vat
1
1.0
1.80
1.00
0.56
2
2.0
2.10
0.50
0.48
3
3.0
2.30
0.33
0.43
4
4.0
2.40
0.25
0.42
5
5.0
2.50
0.20
0.40
6
6.0
2.60
0.17
0.30
Slope = \(\frac{0.65 - 0.40}{1.10 - 0.20} = \frac{0.25}{0.9}\)
= 0.3
X = c = 0.35 = C\(^{-1}\) = 2.86
Precautions; I
ensured that the key was open after each reading so that the battery will not run down quickly.
ensured there was no Zero error when taking the voltmeter reading.
ensured the electrical wire was tightly connected to the terminals in order to avoid current fluctuations.
(b) i. Potential difference is the amount of work done in moving a unit positive charge from a point to another, mostly from a point of lower potential to the point of higher potential. Its density p.d. measured in Volts.
ii. The e.m.f. of a cell is the p.d. across the terminals when it is in an open circuit i.e. hot supplying current to an external circuit. While terminal p.d. 5 is defined as the p.d, between the terminals of a cell when it is delivering current to an external circuit. Therefore, emf is greater because it has not yet been connected to an external circuit.
Source: Official Exam / Past Question Archive
Physics
WAEC / WASSCE 2014
Heat Energy & Temperature
Solution
The mass of an empty density bottle is 30g. When filled with a liquid, the mass of the bottle and the liquid is 40g. On heating the filled bottle through 40ºc, the mass reduces to 38g. Calculate the apparent cubic expansivity of the liquid
A
6.25 x 10K-1
B
6.25 x 10-3K-1
C
2.50 x 10-3K-1
D
2.50 x 10-4K-1
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Apparent cubic expansivity = \(\frac{\text{mass of hot liquid expelled}}{\text{mass of hot liquid left x temp. rise}}\)
= \(\frac{2}{8 \times 40} = 0.00625\)
Source: WAEC / JAMB / NECO Classroom Archive (Record #35758)