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Physics
WAEC / WASSCE 2001
Heat Energy & Temperature
Solution
An object weight 10N immersed in a liquid displaces a quantity of the liquid. If the liquid displaced weighs 6N, determine the upthrust of the object
A
20N
B
10N
C
6N
D
4N
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Upthrust = Weight of fluid displayed = 6N
Source: Myschool Past Questions Archive (Record #33865)
Physics
WAEC / WASSCE 2001
Heat Energy & Temperature
Diagram
Solution
a beam PQ pivoted at P carries a load of 80N as shown above. Calculate the effort E, required to keep it horizontal. [neglect the weight of the beam]
Attached Figure / Diagram
A
32.0N
B
26.7N
C
16.0N
D
13.3N
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
E x 3 = 80 x 0.5
E3 = 40
E = \(\frac{40}{3} = 13.3N\)
Source: Myschool Past Questions Archive (Record #33883)
Physics
WAEC / WASSCE 2001
Heat Energy & Temperature
Solution
Humidity is used to describe the amount of
A
air in water vapour
B
cloud available in the atmosphere
C
air in equal volume of cloud
D
water vapour in the amosphere
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Humidity is used to describe the amount of water vapor in the atmosphere. So OPTION D is correct.
Source: Myschool Past Questions Archive (Record #33903)
Physics
WAEC / WASSCE 2001
Heat Energy & Temperature
Diagram
Solution
What is the effective capacitance in the circuit?
Attached Figure / Diagram
A
2\(\mu F\)
B
6\(\mu F\)
C
18\(\mu F\)
D
216\(\mu F\)
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(\frac{1}{c} = \frac{1}{6} + \frac{1}{6} + \frac{1}{6}\)
= \(\frac{1 + 1 + 1}{6} = \frac{3}{6} = \frac{1}{2}\)
= 2\(\mu F\)
Source: Myschool Past Questions Archive (Record #33935)
Physics
WAEC / WASSCE 2001
Heat Energy & Temperature
Diagram
Solution
Calculate the reactance of the inductor in the circuit diagram shown above [\(\pi = \frac{22}{7}\)]
Attached Figure / Diagram
A
132\(\Omega\)
B
214\(\Omega\)
C
264\(\Omega\)
D
269\(\Omega\)
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\(X_L = 2 \pi fL = 2 \times \pi \times 60 \times 0.7 = 264\Omega \)
Source: Myschool Past Questions Archive (Record #33944)
Physics
WAEC / WASSCE 2001
Heat Energy & Temperature
Solution
You are provided with two wires marked P and C. a resistor \(R_s\) = 1\(\Omega\) and other necessary apparatus.
Connect \(R_s\) in the left-hand gap of the metre bridge, a length L= 100cm of wire P in the right-hand gap and the other apparatus as shown in the diagram: above
Determine the balance point B on the bridge wire AC
Measure and record AB =/s, and BC = /
Evaluate \(R_1\) = (\(\frac{|_{p}}{|_{s}}\))Rs
Repeat the procedure for four other values of L = 90, 80, 70 and 60cm. In each case obtain and record the value of |\(_{s}\) and |\(_{p}\) and evaluate \(R_1\) = (\(\frac{|_{p}}{|_{s}}\))Rs
Repeat the experiment with the second wire, Q. Obtain the value of |\(_{s}\) and |\(_{Q}\) for equal lengths of wire as used in wire P.
Evaluate \(R_1\) = (\(\frac{|_{p}}{|_{s}}\))Rs. In each case, tabulate your readings.
Plot a graph of \(R_2\) on the Vertical axis against \(R_1\) on the horizontal axis.
Determine the slope S, of the graph.
Evaluate the k = \(\sqrt s\).
State two precautions taken to ensure accurate results.
(b)i. Define the resistivity of the material of a wire.
ii. A galvanometer with a full-scale-deflection of 1.5 x10\(^{3}\). A has a resistance of 50\(\Omega\). Determine the resistance required to convert it into a voltmeter reading up to 1.5V.
A
photo electric emission
B
collision of electrons
C
thermionic emission
D
field emission of electrons
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Table of values
L(cm)\(^{3}\)
Ls(cm)
Lp(cm)
\(R_1\)
100
5.3
94.7
17.90
90
6.5
93.5
14.40
80
7.0
93.0
13.30
70
8.5
91.5
10.80
60
9.5
90.5
9.50
L(cm)
Is\(^{1}\)
Lg
\(R_2\)
100
21.60
78.4
3.60
90
22.1
77.9
3.50
80
23.4
76.6
3.30
70
24.3
75.7
3.10
60
25.3
74.7
2.95
L(cm)
Ls(cm)
Lp(cm)
\(R_1\)
Ls\(^{1}\)cm\(^{3}\)
Lq
R\(^{2}\)
100
5.3
94.7
17.90
21.6
78.4
3.60
90
6.5
93.5
14.40
22.1
77.9
3.50
80
7.0
93.0
13.30
23.4
76.6
3.30
70
8.5
91.5
10.80
24.3
75.7
3.10
60
9.5
90.5
9.50
25.3
74.7
2.95
Slope (s) = of the graph = \(\frac{DR_{2}}{DR_{1}} = \frac{1.4}{8.0}\) = 0.175
K = \(\sqrt 5\) = 0.17555 = 0.42
Precautions:
Key was opened where readings were not being taken.
Tight connections were ensured
ParallaX errors were avoided in reading the metre rule.
Zero error was noted in reading the metre rule.
The jockey was not rolled on or allowed to scratch the wire.
(b) The resistivity of a material is defined as the resistance of a unit length of the material/wire of a uni cross-sectional area.
OR
P = \(\frac{AR}{L}\) where
A = cross-sectional area
R = eletrical resistance
L = length of the wire
V = Vg + \(V_R\) = IRg + IR = I (Rg + R) \(\therefore\) \(\frac{V}{I}\) = Rg+ R
= \(\frac{1.5}{1.5 \times 10^{-3}}\) = 50 + R = 10\(^{3}\) = 50 + R \(\therefore\) R = 950\(\Omega\)
Source: Official Exam / Past Question Archive
Physics
NECO SSCE 2001
Heat Energy & Temperature
Which scientist discovered natural radioactivity?
A
Enrico Fermi
B
Henri Becquerel
C
Marie Curie
D
Micheal Faraday
E
Niels Bohr
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 #42813)
Physics
NECO SSCE 2001
Heat Energy & Temperature
What is X in the equation given below? 42He + 94Be → 126C + X
A
electron
B
hydrogen
C
lithium
D
neutron
E
proton
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 #42817)
Physics
NECO SSCE 2001
Heat Energy & Temperature
The statement that the mechanical advantage of a machine is 3 means that the
A
efficiency is 33\(\frac{1}{3}\)%
B
effort is three times as large as the load
C
mechanical advantage is 3 times as large as the velocity ratio
D
ratio of the effort to the load is 1: 3
E
Velocity ratio is 3
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 #42823)
Physics
NECO SSCE 2001
Heat Energy & Temperature
What gives rise to the line spectra observed in atoms?
A
change of an electron from a higher to a lower energy level in the atom
B
disturbed protons in the nucleus
C
excitation of an electron in the atom
D
kinetic energy of a moving atom
E
potential energy of an electron inside an atom
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 #42826)
Physics
NECO SSCE 2001
Heat Energy & Temperature
A lead-acid accumulator is used in preference to a dry battery in a car because
A
a dry battery cannot supply the necessary high voltage
B
a dry battery would not operate on a cold frosty morning
C
the accumulator can give a bigger current and can be recharged
D
the accumulator can supply a.c
E
the chemicals used in a dry battery constitute a fire hazard.
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 #42827)
Physics
NECO SSCE 2001
Heat Energy & Temperature
An object 3.00m high is placed at a distance of 7.50m from a pin-hole camera. If the image height is 6.00 cm, what is the distance of the film from the pin-hole?
A
3.75cm
B
7.50cm
C
15.00cm
D
30.00cm
E
150.00 cm
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 #42843)
Physics
NECO SSCE 2001
Heat Energy & Temperature
Which is NOT one of the laws of solid friction?
A
The frictional force between two surfaces opposes their relative motion
B
The ratio of frictional force to the normal reaction varies for two given surfaces
C
The ratio of frictional force to the normal reaction is constant for two given surfaces
D
The limiting frictional force is independent of the area of surface in contact.
E
Dynamic frictional force is independent of the relative velocity of the surfaces in contact.
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 #42848)
Physics
NECO SSCE 2001
Heat Energy & Temperature
What part of a camera functions in a similar way to the retina of the eye?
A
diaphragm
B
film
C
focusing ring
D
lens
E
shutter
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 #42849)
Physics
NECO SSCE 2001
Heat Energy & Temperature
Which statement is NOT correct about molecules?
A
The number of molecules in a unit volume of a solid is greater than that in a unit volume of a liquid or gas.
B
Molecules are made up of atoms
C
The force of attraction between two molecules of a solid is greater than that between two molecules of a liquid or gas
D
Molecules of gases are in regular motion
E
Molecules of a solid vibrate about their mean positions.
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 #42851)