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Physics
WAEC / WASSCE 2002
Current Electricity & Electric Circuits
A freely-suspended magnet swinging in a horizontal plane comes to rest with its axis pointing approximately
A
north-south
B
south-west
C
north-east
D
south-east
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 #34110)
Physics
WAEC / WASSCE 2002
Atomic, Quantum, Nuclear Physics & Electronics
If a radioactive atom emits a beta particle, Its mass number
A
increases by one
B
remains the same
C
decreases by one
D
increases by two
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 #34144)
Physics
WAEC / WASSCE 2002
Atomic, Quantum, Nuclear Physics & Electronics
Which of the following is usually used to cause fission in an atomic reactor?
A
Alpha particles
B
beta particles
C
electrons
D
Neutrons
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 #34145)
Physics
WAEC / WASSCE 2002
Current Electricity & Electric Circuits
Solution
Measure and record the length XY of the resistance wire provided.
Connect the circuit shown in the diagram.
With R= O\(\Omega\), close the key, K. Read and record the current \(1_o\) and the voltage drop \(V_o\) across the resistance wire.
Setting R = 1\(\Omega\). close the key. Read and record the current, I, and the corresponding voltage drop, V across the wire.
Repeat the procedure for five other values of R= 5, 10, 20, 40, and 60\(\Omega\). Tabulate your readings.
Plot a graph of V on the vertical axis against 1 on the horizontal axis.
Determine the slope of the graph
State two precautions taken to ensure accurate results.
(b)i. Mention and state the law on which the experiment in (a) is based.
ii. A piece of resistance vire of diameter 0.2 mm and resistance m has a resistivity of 8.8 x 10\(^{-7}\)\(\Omega\)m, calculate the length of the Wire. [\(\pi\) =\(\frac{22}{7}\)]
A
Alpha particles
B
beta particles
C
electrons
D
Neutrons
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Table of values
XY = 100cm
R(\(\Omega\))
1(amp)
V
0
0.15
2.65
1
0.15
2.65
5
0.15
2.65
10
0.10
1.85
20
0.08
1.40
40
0.06
0.90
60
0.04
0.70
Slope = \(\frac{x_{2}-x_{1}}{y_{2}-y_{1}} = \frac{1.75-0.5}{0.10-0.025} = \frac{1.25}{0.075}\)
Precautions:
I ensured good contact and the correct connection of the circuit.
I avoided incorrect positioning of the eye (error due to parallax).
Open the key plug when recording the reading taken.
(b)i. The experiment is based on Ohm's law. Ohm's law states that the current flowing through a metallic conductor is proportional to the potential difference between its ends provided the temperature and other physical conditions of the conductor remain constant; i.e: \(\frac{V}{|}\) = Constant.
ii. Area of cross-section of wire = \(\frac{\pi d^{2}}{4} = \frac{\frac{22}{7} \times (0.2)^{2}}{4}\)
\(\frac{3.143 \times 0.04}{4}\) = 0.031mm\(^{2}\) = 3.1m\(^{2}\)
Resistivity = \(\frac{RA}{L}\), length (L) = \(\frac{R.A}{resistivity}\)
= \(\frac{7 \times 3.1}{8.8 \times 10^{-7}} = \frac{21.7}{8.8 \times 10^{-7}}\) = 2.47 x 10\(^{-7}\)
Source: Official Exam / Past Question Archive
Physics
UTME / JAMB 2002
Newton's Laws, Momentum & Collisions
If the total force acting on a particle is zero, the linear momentum will
A
Increase
B
Decrease
C
Be Constant
D
Increase then decrease
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 #41480)
Physics
UTME / JAMB 2002
Waves, Sound & Vibrations
The colours seen on soap bubbles are due to
A
Diffraction
B
Refraction
C
Dispersion
D
Interference
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 #41481)
Physics
NECO SSCE 2002
Atomic, Quantum, Nuclear Physics & Electronics
In an operating X-ray tube, a high p.d is applied between the cathode and the anode for the purpose of
A
accelerating the electrons to a very high energy
B
concentrating electrons on the target
C
heating the anode
D
heating the cathode
E
producing a stream of electrons
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 #42857)
Physics
NECO SSCE 2002
Lenses & Optical Instruments
The ability of the eye to focus on objects at various distances is known as
A
accommodation
B
astigmatism
C
eye ring
D
myopia
E
presbyopia
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 #42858)
Physics
NECO SSCE 2002
Current Electricity & Electric Circuits
Solution
An electric heater takes 4A when operated on a 250V supply. What is the cost of the electricity consumed at 10k per kWh when the heater is used for 5 hours?
A
10k
B
50k
C
N1.00
D
N5.00
E
N10.00
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Electrical power = current x voltage = IV
but I = 4A and V = 250v
P = 4 x 250 = 1000W → 1KW
Electricity consumed = Power x time
= 1 x 5 = 5kwh
but 1kwh = 10k ( given )
cost of electricity consumed for 5hrs = 5 x 10 = 50k.
Source: Myschool Past Questions Archive (Record #42860)
Physics
NECO SSCE 2002
Reflection, Refraction & Dispersion of Light
An object 8cm in front of a plane mirror moves at a speed of 6cm s-1 away from the mirror. What will be the distance separating the object and the image after 2s?
A
8cm
B
12cm
C
20cm
D
28cm
E
40cm
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #42861)
Physics
NECO SSCE 2002
Units, Measurements & Dimensional Analysis
Which is a fundamental unit?
A
ampere
B
joule
C
Newton
D
ohm
E
watt
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 #42862)
Physics
NECO SSCE 2002
Electrostatics & Capacitors
The energy stored in a capacitor of capacitance 5 μF is 40J. What is the voltage applied across its terminals?
A
4V
B
8V
C
16V
D
200V
E
4000V
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #42863)
Physics
NECO SSCE 2002
Magnetism, Electromagnetism & AC Circuits
Which device does NOT make use of the magnetic effects of an electric current?
A
hot-wire ammeter
B
moving-coil ammeter
C
moving-coil loudspeaker
D
moving-iron ammeter
E
telephone earpiece
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 #42864)
Physics
NECO SSCE 2002
Lenses & Optical Instruments
In the normal use of a simple microscope, a person sees an
A
erect, real and magnified image
B
erect, virtual and magnified image
C
inverted, virtual and magnified image
D
inverted, real and magnified image
E
inverted and real image the same size as the object
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 #42865)
Physics
NECO SSCE 2002
Current Electricity & Electric Circuits
A body of mass 4 kg is accelerated from rest by a steady force of 9N. What is its speed when it has travelled a distance of 8m?
A
6 ms-1
B
18 ms-1
C
32 ms-1
D
36 ms-1
E
48 ms-1
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 #42867)