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Physics
NECO SSCE 2002
Heat Energy & Temperature
What is stored by a dry Leclanhé cell?
A
chemical energy
B
heat energy
C
mechanical energy
D
nuclear energy
E
solar energy
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 #42885)
Physics
NECO SSCE 2002
Heat Energy & Temperature
Which process will increase the rate of oscillation of a pendulum?
A
decreasing the amplitude of oscillation of the pendulum
B
decreasing the length of the pendulum
C
decreasing the mass of the pendulum
D
increasing the length of the pendulum
E
increasing the mass of the pendulum.
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 #42887)
Physics
NECO SSCE 2002
Heat Energy & Temperature
Solution
An object weighing 0.60N is hung on a spiral spring and caused it to extend by 6.0cm. The object is removed and a black of wood replacing it causes the spring to extend by 10.0cm. What is the weight of the block of wood?
A
0.10N
B
0.36N
C
0.80N
D
1.00N
E
3.60N
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
From Hooke's law... F = ke
From the first statement
0.6 = k x 0.06
k = \(\frac{0.6}{0.06}\) = 10N/m
From second statement
F = weight of the block = ke
F = 10 x 0.1 = 1.0N
NOTE: Extension (cm → m)
Source: Myschool Past Questions Archive (Record #42889)
Physics
NECO SSCE 2002
Heat Energy & Temperature
An a.c. generator can be converted into a d.c. generator by replacing
A
the slip rings with split-ring commutators
B
the slip rings with armatures
C
the split-rings with slip rings
D
the split-rings with brushes
E
the brushes with slip-ring commutators.
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 #42895)
Physics
NECO SSCE 2002
Heat Energy & Temperature
The silvered walls of a vacuum flask minimise loss of heat due to
A
conduction and convection
B
conduction only
C
convection and radiation
D
convection only
E
radiation only
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 #42899)
Physics
NECO SSCE 2002
Heat Energy & Temperature
Which of the following is a percussion instrument?
A
bell
B
flute
C
guitar
D
piano
E
organ
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 #42901)
Physics
NECO SSCE 2002
Heat Energy & Temperature
A converging lens of focal length 5cm forms a virtual image which is 20cm from the lens. How far from the lens is the object?
A
2.0cm
B
4.0 cm
C
6.7cm
D
20.0cm
E
25.0cm
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: Official Exam / Past Question Archive
Physics
UTME / JAMB 2002
Heat Energy & Temperature
A wire is gradually stretched until it snaps. Sketch a load-extension graph for the wire and on the graph indicate the
(a) elastic limit;
(b) yield point;
(c) maximum load;
(d) breaking point.
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option .
Source: Myschool Past Questions Archive (Record #54082)
Physics
UTME / JAMB 2002
Heat Energy & Temperature
Solution
(a) Define horizontal range of a projectile.
(b) The horizontal range, R, of a projectile is given by the equation R = \(\frac{u^2 sin 2\theta}{g}\)
(i) what does \(\theta\) in the equation represent?
(ii) for what value of \(\theta\) would R be maximum?
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
(a) Horizontal range is the horizontal distance between the point of projection and the point of landing
(b) (i) \(\theta\) = angle of projection
(ii) R is maximum when \(\theta\) = 45^\circ
Source: Myschool Past Questions Archive (Record #54083)
Physics
UTME / JAMB 2002
Heat Energy & Temperature
Solution
(a) What is meant by;
(i) anode;
(ii) cathode, as used in electrolysis?
(b) List the ions involved in an electrolytic process with dilute tetraoxosulphate (VI) acid as electrolyte
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
(a)(i) Anode - is positive electrode which attracts negative ions of the electrolyte.
(ii) Cathode - is negative electrode which attracts positive ions of the electrolyte.
(b) Ions present are: H\(^+\), OH\(^{-}\) and SO\(_4^{-2}\)
Source: Myschool Past Questions Archive (Record #54085)
Physics
UTME / JAMB 2001
Heat Energy & Temperature
Solution
Which of the following graphs correctly represents the variation of mass of a given material deposited with time for constant current in Faraday's Law of Electrolysis?
A
A
B
B
C
C
D
D
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
According to Faraday's Law, the mass of the substance deposited is directly proportional to the time for which the current flows, assuming a constant current. Therefore, the graph should show a linear increase in mass over time, which corresponds to option A
Source: Official Exam / Past Question Archive
Physics
UTME / JAMB 2001
Heat Energy & Temperature
Solution
If a spherical metal bob of radius 3cm is fully immersed in a cylinder containing water and the water level rises by 1cm, what is the radius of the cylinder?
A
12cm
B
1cm
C
3cm
D
6cm
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
If the bob is fully immersed in the water, then the volume of water displaced will be equal to the volume of the bob = 4/3πr3, where r is the radius of the bob.
This volume of water in the cylinder = πr2l, where r = radius of the cylinder, and l = level of water rose in the cylinder.
Therefore, π x r2 x l = 4/3 x π x 33
Then r2 = 36
r = √36
r = 6cm
Source: Myschool Past Questions Archive (Record #1506)
Physics
UTME / JAMB 2001
Heat Energy & Temperature
Diagram
Solution
The diagram above shows the capacitors C\(_1\), C\(_2\) and C\(_3\) 2\muF, 6\muF and 3\muF respectively. The potential difference across C\(_1\), C\(_2\) and C\(_3\) respectively are
Attached Figure / Diagram
A
4V, 6V and 2V
B
2V, 6V and 4V
C
6V, 4V and 2V
D
6V, 2V and 4V
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
C = \(\frac{\text{Q}}{\text{V}}\) => Q = CV : ∴ V = \(\frac{\text{Q}}{\text{C}}\)
∴V\(_1\) = \(\frac{\text{Q}}{C_1}\); V\(_2\) = \(\frac{\text{Q}}{C_2}\);
V\(_3\) = \(\frac{\text{Q}}{C_3}\)
for series
\(\frac{1}{\text{C}}\) = \(\frac{1}{C_1}\) + \(\frac{1}{C_2}\) + \(\frac{1}{C_3}\)
= \(\frac{1}{2} + \frac{1}{6} + \frac{1}{3}\)
= \(\frac{3 +1 + 2}{6}\)
= \(\frac{6}{6}\) = 1
∴ C = 1\muF = 1.0 x 10\(^{-6}\)F
∴ Q = CV = 1.0 x 10\(^{-6}\) x 12
= 12.0 x 10\(^{-6}\)C
∴V\(_1\) = \(\frac{\text{Q}}{C_1}\)
= \(\frac{12 \times 10^{-6}}{2 \times 10^{-6}}\)
= 6V
V\(_2\) = \(\frac{\text{Q}}{C_2}\)
= \(\frac{12 \times 10^{-6}}{6 \times 10^{-6}}\)
= 2V
V\(_3\) = \(\frac{\text{Q}}{C_3}\)
= \(\frac{12 \times 10^{-6}}{3 \times 10^{-6}}\)
= 4V
∴ 6V, 2V and 4V
Source: Myschool Past Questions Archive (Record #11841)
Physics
UTME / JAMB 2001
Heat Energy & Temperature
Solution
In a Daniel cell, the depolarizer, positive and negative electrodes are respectively
A
copper sulphate, copper and zinc
B
manganese dioxide, carbon and zinc
C
sulphuric acid, lead oxide and lead
D
potassium hydroxide, nickel and iron.
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
In the Daniel cell,
i. Depolarize = CuSO4 solution
ii. Positive electrode = Copper container
iii Negative electrode = zinc rod/plate
Source: Myschool Past Questions Archive (Record #7308)
Physics
WAEC / WASSCE 2001
Heat Energy & Temperature
Solution
A spring balance,which is suspended from the roof of a lift, carries a mass of 1kg at its free end. If the lift accelerates upwards at 2.5ms-2, determine the reading on the spring balance. [g = 10ms-2]
A
24.0N
B
12.5N
C
7.5N
D
4.0N
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
F = ma
= 1 x 2.5 = 2.5N
weight = mg = 1 x 10 = 10N
Reading = F + Wt = 2.5 + 10
= 12.5N
Source: Myschool Past Questions Archive (Record #33864)