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Physics
WAEC / WASSCE 2002
Heat Energy & Temperature
Which of the following actions will not lead to an increase in the induced e.m.f. in a coil of wire rotating between the poles of a magnet? Increasing the
A
strength of the magnet
B
number of turns in the coil
C
speed of location in the coil
D
gap between the poles of the magnet
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 #34105)
Physics
WAEC / WASSCE 2002
Heat Energy & Temperature
Which of the following materials is used to control the rate of neutron production in a nuclear reactor?
A
boron rods
B
concrete shield
C
graphite rods
D
uranium rods
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 #34146)
Physics
WAEC / WASSCE 2002
Heat Energy & Temperature
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
Heat Energy & Temperature
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
Heat Energy & Temperature
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
Heat Energy & Temperature
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
Heat Energy & Temperature
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
Heat Energy & Temperature
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
Heat Energy & Temperature
Which statement is NOT correct about Rutherford’s model of the atom?
A
The diameter of the nucleus is of the order of 10-15m
B
The mass of an atom is concentrated in the nucleus
C
The model is applicable to atoms with one electron in the outer shell
D
The nucleus of an atom is positively charged
E
The nucleus is surrounded by an electron cloud.
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 #42869)
Physics
NECO SSCE 2002
Heat Energy & Temperature
Solution
In which of the following are the substances arranged in descending order of their thermal conductivities?
A
aluminium, copper, iron
B
aluminium, iron, copper
C
copper, aluminium, iron
D
copper, iron. aluminium
E
iron, copper, aluminium
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
metals thermal conductivity( W/mk)
IRON 65.7
COPPER 377
ALUMINIUM 218
THERMAL CONDUCTIVITIES OF Al, Fe, and Cu at 100degree Celsius
Source: Myschool Past Questions Archive (Record #42870)
Physics
NECO SSCE 2002
Heat Energy & Temperature
What part of the camera corresponds to the iris of the eye?
A
diaphragm
B
film
C
focusing ring
D
lens
E
shutter
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 #42871)
Physics
NECO SSCE 2002
Heat Energy & Temperature
In which simple machine is the effort applied between the load and the fulcrum?
A
claw hammer
B
nut crackers
C
pliers
D
sugar tongs
E
wheelbarrow
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 #42874)
Physics
NECO SSCE 2002
Heat Energy & Temperature
A body of weight 20N displaces 12N of the liquid in which it is immersed. What is the upthrust of the liquid on the body?
A
240N
B
32N
C
20N
D
12N
E
8N
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 #42875)
Physics
NECO SSCE 2002
Heat Energy & Temperature
If the refractive index of water is 1.33, what is the critical angle for a water-air boundary?
A
36.0 °
B
40.2 °
C
41.8 °
D
48.8 °
E
62.7 °
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 #42880)
Physics
NECO SSCE 2002
Heat Energy & Temperature
What does NOT affect the rate of evaporation of a liquid
A
exposed surface area of the liquid
B
humidity of the surroundings
C
nature of the liquid
D
temperature the liquid
E
volume of the liquid.
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 #42881)