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Physics
WAEC / WASSCE 2005
Heat Energy & Temperature
Solution
Fuel was consumed at a steady rate of 5.0 x 10-2kg per second in a rocket engine and ejected as a gas with a speed of 4 x 103ms-1. Determine the thrust on the rocket
A
20N
B
80N
C
200N
D
800N
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
F = ma = \(\frac{mv}{t} = \frac{5 \times 10^{-2} \times 4 \times 10^{3}}{1}\)
= 200N
Source: Myschool Past Questions Archive (Record #34457)
Physics
WAEC / WASSCE 2005
Heat Energy & Temperature
Which of the following statements is correct?
A
the density of a liquid decreases when it expands
B
the density of a liquid increases when the liquids are heated
C
the real expansivity of a liquid is less than its apparent expansivity
D
a liquid changes to solid when heated to a sufficiently high temperature
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 #34482)
Physics
WAEC / WASSCE 2005
Heat Energy & Temperature
Which of the following statements is an advantage of nuclear fusion over nuclear fission?
A
The resulting chain reaction which produces large amount of energy
B
no radioactve wave is produced as bye product
C
very high temperature is required in the process
D
the end product is lead
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 #34579)
Physics
WAEC / WASSCE 2005
Heat Energy & Temperature
Solution
You are provided with a potentiometer XY, a voltmeter, V, a standard resistor R, an accumulator, E a plug key, K, a jockey, and connecting wires.
Connect a circuit as shown in the diagram above.
Close the key and use the jockey to make contact with the potentiometer with XY at a point N such that l = XN= 15cm.
Read and record the value of the potential difference V on the voltmeter.
Evaluate l\(^{-1}\) and V\(^{-1}\).
Repeat the procedure for five other values of I= 25, 35, 45, 55, and 65cm respectively. Read and record the value of V and evaluate V\(^{-1}\) and l\(^{-1}\) in each case. Tabulate your readings.
Plot a graph V\(^{-1}\) on the vertical axis against l\(^{-1}\)on the horizontal axis starting both axes from the origin (0,0).
Determine the slope, s, of the graph.
Evaluate k = \(\frac{1}{s}\)
State two precautions taken to ensure accurate re- results.
(b)i. State four factors on which the resistance of a wire depends.
ii. A resistance Wire of length 100cm is connected in a circuit. If the resistance per unit length of the wire is 0.02 \(\Omega\)cm\(^{-1}\), how much heat would be produced in the wire if a voltmeter connected across its ends indicates 1.5V while the current runs for 1 minute?
A
94 and 238
B
90 and 236
C
88 and 234
D
90 and 234
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Tables of value/observation
S/N
L 9cm)
V (volts)
L\(^{-1}\)(cm\(^{-1}\))
V\(^{-1}\)(volts\(^{-1}\))
L\(^{-1}\)(cm\(^{-1}\))x10\(^{-3}\)
1
15.0
0.60
0.067
1.667
67.0
2
25.0
0.80
0.040
1.250
40.0
3
35.0
1.10
0.029
0.909
29.0
4
45.0
1.30
0.022
0.909
22.0
5
55.5
1.60
0.018
0.625
18.0
6
65.0
1.80
0.015
0.556
15.0
(6) The graph of V\(^{-1}\)(volts\(^{-1}\)) vs \(\bigtriangleup\) L\(^{-1}\) (cm\(^{-1}\)
Scale: V\(^{-1}\)(volts\(^{-1}\)) axis: 2cm = 0.15units
\(\bigtriangleup\) L\(^{-1}\) (cm\(^{-1}\)) axis: 2cm = 7units
(7) Slope/gradient = \(\frac{\bigtriangleup {V}^{-1}(volts ^{-1})}{\bigtriangleup {L}^{-1}(cm^{-1})}\)
= \(\frac{1.575-0.405}{63-4.2} = \frac{1.17}{58.8}\)
= 0.0199cm/volts
(8) K = \(\frac{1}{s} = \frac{1}{0.0199}\) = 50.25 volts/cm
precautions are:
I would ensure that the key is opened when the circuit is not in use to avoid the cell being used up.
I would ensure that the electrical wires are tightly connected
I would ensure that I take note of the zero error in the pointer instruments to avoid systematic error
I would ensure that I take pointer readings within the vertical eye level to avoid parallax
I used short connecting wires to ensure that the required energy to dive the electrical charges was not used up in overcoming the resistance of the wire.
(b)i. The factors affecting the resistance of a wire are:
- length of wire (R&L)
- cross-sectional area of the (R \(\propto\))
- Nature of material
- Temperature of the wire
ii. R = 100cm x 0.02\(\Omega\)cm = 2\(\Omega\), v =1.5v
t = 1min = 60s
H =p x t = \(\frac{V^{2}t}{R} = \frac{(1.5)^{2}}{2}\) x 60 = 67.5J
OR
I = \(\frac{V}{R} = \frac{1.5}{2}\) = 0.75A
H = P x t = I\(^{2}\)Rt = (0.7)\(^{2}\) x 60 x 2
= \(\frac{9}{16}\)x120 = 67.5J
Source: Official Exam / Past Question Archive
Physics
UTME / JAMB 2005
Heat Energy & Temperature
Solution
If two inductors of inductances 3H and 6H are arranged in series, the total inductance is
A
9.0H
B
18.0H
C
0.5H
D
2.0H
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
l =l1 + l2 = 3 + 6 = 9H
Source: Myschool Past Questions Archive (Record #41441)
Physics
UTME / JAMB 2005
Heat Energy & Temperature
Solution
An elastic material has a length of 36cm when a load of 40N is hung on it and a length of 45cm when a load of 60N is hung on it. The original length of the string is
A
12cm
B
20cm
C
18cm
D
15cm
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
For Hooke's law F = Ke
\( \implies \frac{F}{e} = K\)
\(\frac{f_1}{e_1} = \frac{f_2}{e_2}\)
\(\text{Let the original length} = t_0 \)
\(\text{therefore}\) e\(_1\) = (36 - t_0)\)cm ; e\(_2 = (46 - t_0)\)cm
\(f_1\) = 40N, \(f_2\) = 60N
\(\frac{40}{36 - t_0} = \frac{60}{45 - t_0}\)
\(\implies 40(45 - t_0) = 60(36 - t_0)\)
\(\text{therefore } 1800 - 40t_0\) = 2160 - 60\(t_0\)
60\(t_0\) - 40\(t_0\) = 2160 - 1800
20\(t_0\) = 360
\(t_0\) = 18cm
Source: Myschool Past Questions Archive (Record #41442)
Physics
NECO SSCE 2005
Heat Energy & Temperature
491 K is equivalent to
A
273 °C
B
218 °C
C
373 °C
D
491 °C
E
764 °C
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 #43000)
Physics
NECO SSCE 2005
Heat Energy & Temperature
The following are derived units EXCEPT
A
kg m-3
B
N
C
Ns
D
m3
E
kg
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 #43002)
Physics
NECO SSCE 2005
Heat Energy & Temperature
A stone of mass 0.7 kg is projected vertically upward with a speed of 5 ms-1. Calculate the maximum height reached. [g =10ms-2]
A
1.25m
B
1.50m
C
2.50m
D
3.75m
E
5.00Nm
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 #43007)
Physics
NECO SSCE 2005
Heat Energy & Temperature
Mercury does NOT wet glass because
A
glass is an amorphous substance
B
the adhesive force is greater than the cohesive force
C
the cohesive force is greater than the adhesive force.
D
mercury has very high thermal conductivity
E
mercury is opaque.
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 #43012)
Physics
NECO SSCE 2005
Heat Energy & Temperature
When some ice cubes are added to a glass of warm water, the glass is cooled by a process of
A
conduction only
B
convection only
C
conduction and convection
D
conduction and radiation
E
radiation only
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 #43013)
Physics
NECO SSCE 2005
Heat Energy & Temperature
The length of a simple pendulum is increased by a factor of four. By what factor is its period Increased?
A
0.25
B
0.5
C
1.66
D
2
E
4
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 #43014)
Physics
NECO SSCE 2005
Heat Energy & Temperature
Which of the following pairs is an example of translucent bodies?
A
Cardboard and moon
B
Clear water and glass
C
Frosted glass and waxed paper
D
Oiled paper and brick
E
Wood and metal sheet
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 #43015)
Physics
NECO SSCE 2005
Heat Energy & Temperature
The mercury column in a simple mercury barometer is of height 5m above the mercury in a reservoir. If the tube is replaced with one whose radius is twice that of the first tube, what will be the height of the mercury column in the new tube?
A
2.5m
B
5.0m
C
7.5m
D
10.0m
E
20.0m
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 #43017)
Physics
NECO SSCE 2005
Heat Energy & Temperature
Which of the following is NOT a component of an a.c. generator?
A
Armature
B
Carbon brushes
C
Magnet
D
Slip ring
E
Split rings
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 #43020)