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Physics
WAEC / WASSCE 2004
Heat Energy & Temperature
A steel needle floating on water, sinks when kerosine is added to the water. This is because the kerosine
A
increased the surface tension of the water
B
reduces the density of the water
C
reduces the surface tension of the water
D
reduces the upthrust on the needle
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 #34274)
Physics
WAEC / WASSCE 2004
Heat Energy & Temperature
The speed of an object in rectilinear motion can be determine from the
A
area under a velocity-time graph
B
area under a distance-time graph
C
slope of a distance-time graph
D
slope of a velocity-time graph
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 #34278)
Physics
WAEC / WASSCE 2004
Heat Energy & Temperature
Which of the following concept is not an evidence of the particle nature of matter?
A
diffusion
B
brownian motion
C
diffraction
D
crystallization
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 #34272)
Physics
WAEC / WASSCE 2004
Heat Energy & Temperature
Solution
The bob of a single pendulum has a mass of 0.02kg. Determine the weight of the bob [g = 10ms-2]
A
0.02N
B
0.20N
C
20.00N
D
200.00N
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Wt = mg = 0.02 x 10 = 0.2N
Source: Myschool Past Questions Archive (Record #34283)
Physics
WAEC / WASSCE 2004
Heat Energy & Temperature
On a cold day, a concrete floor feels colder to the bear foot then a mat on the same floor because the
A
is better conductor of heat than the foot
B
mat loses heat to the bare foot at a faster rate
C
mat is better conductor of heat than the floor
D
concrete floor is a better conductor of heat than the mat
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 #34319)
Physics
WAEC / WASSCE 2004
Heat Energy & Temperature
Solution
A man 1.8m tall stands 3m away from a pin hole camera. If the distance between the pin hole and the screen of the camera is 0.3m. Calculate the height of the image of the man produced by the camera
A
0.18m
B
0.50m
C
1.62m
D
18.00m
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
hi = \(\frac{ho \times v}{u} = \frac{1.8 \times 0.3}{3} = 0.18m\)
Source: Myschool Past Questions Archive (Record #34346)
Physics
WAEC / WASSCE 2004
Heat Energy & Temperature
A magnified and virtual image of a near object is produced by
A
prism binoculas
B
astronomical telescope
C
periscope
D
simple microscope
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 #34358)
Physics
WAEC / WASSCE 2004
Heat Energy & Temperature
Which of the following reasons explains why the walls and ceilings of a standard concert hall are usually covered with perforated pads? To
A
increase the intensity of sound waves
B
increases the loudness of the sound waves
C
reduce the effect of revibration of sound waves
D
decreases thr frequency of sound waves
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 #34370)
Physics
WAEC / WASSCE 2004
Heat Energy & Temperature
Which of following functions is performed by manganese IV oxide in the Lenclanche cell?
A
control of local action
B
depolarisation of the cell
C
regulating current flow in the cell
D
reduction of the internal resistance of the cell
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 #34391)
Physics
WAEC / WASSCE 2004
Heat Energy & Temperature
Solution
Find the cost of running a 60W lamp for 24 hours. If 1kW hr cost 5 naira
A
14.4 naira
B
12.5 naira
C
7.2 naira
D
2.0 naira
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Cost = P(Kwh) x Cost per KW
= \(\frac{60 \times 24}{1000} \times N5 = N7.2\)
Source: Myschool Past Questions Archive (Record #34396)
Physics
WAEC / WASSCE 2004
Heat Energy & Temperature
Which of the following statements is not correct?
A
a magnetic field is a region in which a magnetic force will be detected
B
a magnetic line of force is a path along which a magnetic fields are scalar quantities it were free
C
magnetic fields are scalar quantities
D
neutral point are obtained where the earth's magnetic force is exactly equal and opposite to that due to a magnet
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 #34403)
Physics
WAEC / WASSCE 2004
Heat Energy & Temperature
Solution
Which of the following representations is correct for an atom X with 28 electrons and 30 neutrons?
A
\(^{30}_{28} X\)
B
\(^{28}_{30} X\)
C
\(^{58}_{30} X\)
D
\(^{58}_{28} X\)
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
\(X^{A = p + n = 28 + 30 = 58}_{Z = P = E = 28}\)
Source: Myschool Past Questions Archive (Record #34412)
Physics
WAEC / WASSCE 2004
Heat Energy & Temperature
Solution
Measure and record the emf, \(V_o\) of the cell provided.
Connect a circuit as shown in the diagram above.
With the key, K closed vary the rheostat, Rh to obtain a current 1 = 0.20A. Read and record the corresponding value of the potential difference, V on the voltmeter.
Evaluate 1\(^{-1}\) and V\(^{-1}\).
Repeat the procedure for four other values of l = 0.25, 0.30, 0.35 and 0.40 A. Tabulate your readings.
Plot a graph V\(^{-1}\) on the vertical axis against 1\(^{-1}\) on the horizontal axis.
Determine the slope, s, of the graph
Evaluate s\(^{-1}\).
State two precautions taken to ensure accurate results.
(b)i. Explain Ohmic conductor:
ii. Explain resistivity of the material of a wire.
A
focal legth of the lens
B
thickness of the lens
C
radius of curvature of the lens
D
diameter of the lens
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
1. \(v_o\) = 3.0v
2. \(V_R\) = 0.20 volts
3. l = 0.20, 1\(^{-1}\) = \(\frac{1}{1} = \frac{1}{0.2}\) = 5
V = 0.2, V\(^{-1}\) = \(\frac{1}{V} =\frac{1}{0.2}\) = 5
Table of values/observations
S/N
IA
I\(^{-1}\)(A\(^{-1}\))
V(volts)
V\(^{-1}\)(volts\(^{-1}\))
1
0.20
5.00
0.19
5.26
2
0.25
4.00
0.23
4.35
3
0.30
3.33
0.28
3.57
4
0.35
2.86
0.33
3.03
5
0.40
2.50
0..38
2.63
Slope (s) = \(\frac{\bigtriangleup {V}^{-1}}{\bigtriangleup {I}^{-1}}\)
S = \(\frac{5.1-1.0}{4.55-12} = \frac{4.1}{3.35}\) = 1.224
S\(^{-1}\) = \(\frac{1}{s} = \frac{1}{1.224}\) = 0.817
N.B: R = S\(^{-1}\) = 1.0
Precautions taken to ensure accurate results are as follows
Tight connections ensured/clean terminals
Repeated readings have been shown on the table
Parallax error in reading voltmeter/ammeter avoided
Key open when reading is not being taken
(b)i. An ohmic conductor is s Conductor in which the current passing through it is proportional to the p.d across the conductor, provided temperature and other physical conditions are constant.
ii. The resistivity of the material of a wire is the resistance of a unit length of the wire of unit Crofs sectional area. It is denoted by p. and measured in ohm-metre (L-m).
Source: Official Exam / Past Question Archive
Physics
NECO SSCE 2004
Heat Energy & Temperature
The component of a vector in a given direction is
A
equal to the magnitude of the resultant vector in that direction
B
equal to the magnitude of the resultant vector in the opposite direction
C
its effective magnitude
D
its effective value in that direction
E
its effective value in the opposite direction
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 #42960)
Physics
NECO SSCE 2004
Heat Energy & Temperature
Which of the following is NOT an example of a percussion instrument?
A
Bell
B
Drum
C
Flute
D
Gong
E
Xylophone
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 #42963)