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Physics
WAEC / WASSCE 2000
Heat Energy & Temperature
Solution
The capacitance of a parallel-plate capacitor is increased by making the area of the plates
A
small and their seperation large
B
large and their seperation small
C
and their seperation small
D
and their seperation equal
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Making the area large and the separation small will increase the capacitance.
Source: Myschool Past Questions Archive (Record #33835)
Physics
WAEC / WASSCE 2000
Heat Energy & Temperature
Solution
The nucleon number and the proton number of a neutral atom of an element are 23 and 11 respectively. How many neutrons are present in the atom?
A
11
B
12
C
23
D
34
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Nucleon number = Proton number + Neutron number
Neutron number = Nucleon number − Proton number
Neutron number = 23 - 11 = 12
The number of neutrons present in the atom is 12
Source: Myschool Past Questions Archive (Record #33947)
Physics
WAEC / WASSCE 2000
Heat Energy & Temperature
Solution
Measure and record the e.m.f. of the accumulator provided.
Connect a circuit as shown in the diagram. S is a standard resistor and R is a resistance box.
With R = 0\(\Omega\), close the key K. Read and record the ammeter reading I. Evaluate 1\(^{-1}\).
Repeat the procedure for R=1,2, 3, 4, and 5\(\Omega\). Tabulate your readings.
Plot a graph of R on the vertical axis and 1\(^{-1}\) on the horizontal axis, starting both axis from the origin (0,0).
Determine the slope s of the graph and find the intercept C on the vertical axis.
State two precautions taken to ensure accurate results.
(b)i. State two advantages of a lead-acid accumulator over a Leclanche cell.
ii. A parallel combination of 3\(\Omega\) and 4\(\Omega\) resistors is connected in series with a resistor of 4\(\Omega\) and a battery of negligible internal resistance. Calculate the effective resistance in the circuit.
A
11
B
12
C
23
D
34
E
mutual forces excerted by the balls
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
The e.m.f of the accumulator = 1.5v
Table of value/observations
R(\(\Omega\))
1\(_{amp}\)
1\(^{-1}_{amp}\)
0
0.78
1.28
1
0.50
2.00
2
0.38
2.63
3
0.30
3.33
4
0.25
4.00
5
0.22
4.55
Slope (s) = \(\frac{y_{2}-y_{1}}{x_{2}-x_{1}} = \frac{4-1}{4-2} = \frac{3}{2}\)
The intercept on the vertical axis is =-1.85\(\Omega\)
Precautions:
I tightened connections.
I avoided errors due to parallax in reading ammeter or voltmeter.
I noted zero error of ammeter/ voltmeter.
I removed key when readings were not taken.
I took repeated readings from the table, i.e. averaging the reading.
(b)i.
- The lead-acid accumulator can be recharged while the Leclanche cell cannot.
- The lead-acid accumulator has the capacity to supply large currents for a long time while the leclanche cell does not.
ii. The two resistors 3\(\Omega\) and 4\(\Omega\) are connected in parallel.
\(\therefore\) The equivalent resistance (\(\Omega\) = \(\frac{1}{R} = \frac{1}{3} = \frac{1}{4} = \frac{4+3}{12}\)
= \(\frac{7}{12}\) = 1.71
The effective resistance in the circuit = 1.71 + 4 = 5.71\(\Omega\)
Source: Official Exam / Past Question Archive
Physics
NECO SSCE 2000
Heat Energy & Temperature
Solution
The helium isotope \(^3_2He\)
A
has three pro tons and two neutrons
B
has two protons and one neutron
C
has two protons and three neutrons
D
has one proton and two neutrons
E
cannot exist because it has the same mass number as tritium
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Based on nuclear physics, the correct answer is B: \(^3_2\)He has two protons and one neutron.
Source: Myschool Past Questions Archive (Record #42682)
Physics
NECO SSCE 2000
Heat Energy & Temperature
A piece of stone weights 180 N in air and 150 N in a beaker containing 160 N of methylated spirit. What is the up thrust exerted on the stone?
A
50N
B
40N
C
30N
D
20N
E
10N
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 #42684)
Physics
NECO SSCE 2000
Heat Energy & Temperature
Which of the following is used in a nuclear reactor to slow down fast moving neutrons?
A
graphite rods
B
carbon dioxide gas
C
liquid sodium metal
D
concrete shield
E
boron 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 #42686)
Physics
NECO SSCE 2000
Heat Energy & Temperature
The heat from a fire in a closed room reaches someone far away in the room, mainly by
A
reflection
B
diffusion
C
conduction
D
radiation
E
convection
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 #42719)
Physics
NECO SSCE 2000
Heat Energy & Temperature
Solution
Which of the following is NOT part of an a.c generator?
A
Commutator
B
Armature
C
Field magnet
D
Carbon brushes
E
Slip rings
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The general A.C. generator has all the listed components except the commutator.
Source: Myschool Past Questions Archive (Record #42729)
Physics
NECO SSCE 2000
Heat Energy & Temperature
In a simple pendulum experiment, a boy observed that the times for 30 oscillations are 70.0s, 72.0s and 67.0s respectively. Calculate the mean period of oscillation of the pendulum.
A
0.14s
B
0.43s
C
2.32s
D
2.40s
E
6.97s
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 #42731)
Physics
NECO SSCE 2000
Heat Energy & Temperature
The unit of inductance is
A
Weber
B
Telsa
C
Hertz
D
Henry
E
Farad
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 #42741)
Physics
NECO SSCE 2000
Heat Energy & Temperature
An astronomical telescope which is being used to view a very distant object is said to be in normal adjustment if
A
the final image is at the near-point
B
the image formed by the objective is before the focus of the eye piece
C
the angular magnification is the ratio of the focal length of the eye-piece lens to that of the objective
D
the foci dl the objective and the eye-piece coincide between the lenses
E
the distance between the objective lens and the eye-piece is equal to the difference between their focal lengths.
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 #42778)
Physics
NECO SSCE 2000
Heat Energy & Temperature
The smallest unit on the sleeve of a micrometer screw gauge is 0.5mm. There are fifty divisions on the thimble of the screw gauge.
What is the smallest length that can be measured with this instrument?
A
0.05cm
B
0.01cm
C
0.005cm
D
0.001cm
E
0.0001cm
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 #42803)
Physics
NECO SSCE 2000
Heat Energy & Temperature
The length of a side of a metallic cube at 20° C is 5.0cm. Given that the linear expansively of the metal is 4.0 × 10-5K-1, find the volume of the cube at 120° C
A
124.50cm3
B
125.00cm3
C
126.00cm3
D
126.25cm3
E
126.50cm3
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 #42805)
Physics
NECO SSCE 2000
Heat Energy & Temperature
A boy ran a distance of 200m in 24s. His average speed was 8.3ms-1. Which of the following is correct about the units in which the statements above are expressed?
A
All the units are fundamental.
B
All the units are derived
C
All the units except one are S.I units
D
Two of the units are fundamental and one derived.
E
None of the units is S.I units.
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 #42810)
Physics
NECO SSCE 2000
Heat Energy & Temperature
A boy ran a distance of 200m in 24s. His average speed was 8.3ms-1. Which of the following is correct about the units in which the statements above are expressed?
A
All the units are fundamental.
B
All the units are derived
C
All the units except one are S.I units
D
Two of the units are fundamental and one derived.
E
None of the units is S.I units.
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: Official Exam / Past Question Archive