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Physics
UTME / JAMB 2005
Current Electricity & Electric Circuits
Solution
Two liquids L1 and L2 are contained in a U - tube. The height and the density of L1 are 8 cm and 103 kgm-3 respectively. If the density of L2 is 800 kgm-3, its height measured from the same level is
A
8 cm
B
10 cm
C
16 cm
D
12 cm
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Generally, from Hares Experiment, density is inversely proportional to height
i.e h ∝1/d; → h1d1 = h2d2
∴ 8 x 103 = h2 x 800
∴ h2 = 8 x 103_800
= 10cm
Source: Myschool Past Questions Archive (Record #14278)
Physics
UTME / JAMB 2005
Calorimetry, Latent Heat & Change of State
Solution
106J of heat is required to boil off completely 2kg of a certain liquid. Neglecting heat lost to the surroundings, the latent heat of vaporization of the liquid is
A
2.0 x 106J kg-1
B
5.0 x 106J kg-1
C
2.0 x 105J kg-1
D
5.0 x 105J kg-1
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
From the heat exchange involved, the latent heat of vaporization, L can be deduced from the relation:
ML = 106, where M = mass of the liquid.
∴ 2 x L = 106
=> L = 106/2 = 5.0 x 105J kg-1
Source: Myschool Past Questions Archive (Record #14279)
Physics
UTME / JAMB 2005
Electrostatics & Capacitors
Diagram
Solution
The figure above shows three capacitors, 2μF, 3μF and 6μF connected in series. If the p.d across the system is 12V, the p.d, across the 6μF capacitor is
Attached Figure / Diagram
A
4V
B
12V
C
2V
D
6V
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
The effective capacitance in the circuit is given by:
1/C = 1/2 + 1/3 + 1/6 = 6/6
therefore C = 1μF or
1.0 x 10-6F.
Since C = Q/V, its implies that the charges Q, flowing in the circuit is given by Q = CV
= 1.0 x 10-6 x 12
= 12.0 x 10-6 Coulomb.
∴ P.d across the 6μF,
V = Q/C = 12.0 x 10-66.0 x 10-6F
= 2.0 volts
Source: Myschool Past Questions Archive (Record #14280)
Physics
UTME / JAMB 2005
Reflection, Refraction & Dispersion of Light
Diagram
Solution
The figure above shows a plot of angles of deviation through a glass prism when light is incident at \theta degrees on the prism. The incident angle that produces the minimum deviation is
Attached Figure / Diagram
A
20o
B
18o
C
35o
D
25o
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
From the given graph, when the angle of minimum deviation = 18º, the angle of incidence = 25º
Source: Myschool Past Questions Archive (Record #14271)
Physics
UTME / JAMB 2005
Current Electricity & Electric Circuits
Diagram
Solution
The value of F in the figure above when in equilibrium is
Attached Figure / Diagram
A
10N
B
12N
C
20N
D
27N
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
F = \(\frac{17}{sin 60} = \frac{17}{0.866}\)
= 20N
Source: Myschool Past Questions Archive (Record #14272)
Physics
UTME / JAMB 2005
Newton's Laws, Momentum & Collisions
Diagram
Solution
In the figure above, the coefficient of static friction is 0.5. If the tension in the string is T, the acceleration of the system in motion is
Attached Figure / Diagram
A
5 ms-2
B
15 ms-2
C
3 ms-2
D
9 ms-2
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Normal reaction R = 3 kg x 10 = 30N
coefficient of friction , μ = 0.5
∴ acting frictional force = μR = 30 x 0.5
Pulling/sliding force F = 6kg x 10 = 60N.
∴ Net downward force = ma = 60 - 15.0
=> (3 + 6)a = 45
∴ 9a = 45
a = 5m/s2
Source: Myschool Past Questions Archive (Record #14273)
Physics
UTME / JAMB 2005
Current Electricity & Electric Circuits
Diagram
Solution
If the system above is in equilibrium, the tension in the string Q is
Attached Figure / Diagram
A
11N
B
9N
C
4N
D
6N
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
If the string is in equilibrium, the the tension in the string Q = 4N + 5N = 9N
Source: Myschool Past Questions Archive (Record #14274)
Physics
UTME / JAMB 2005
Work, Energy, Power & Simple Machines
Diagram
Solution
In the figure above, the work done by the force of 100N inclined at an angle of 60o to the object dragged horizontally to a distance of 8m is
Attached Figure / Diagram
A
800J
B
600J
C
100J
D
400J
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Since the force is inclined at an angle 60o to the horizontal, the effective component of te force along the horizontal is given by F x cos 60o
= 100 x 0.5 = 50N.
∴ work done = F x cos 60 x displacement
= 50 x 8.0m
= 400.0J
Source: Myschool Past Questions Archive (Record #14275)
Physics
WAEC / WASSCE 2005
Scalars, Vectors & Relative Motion
Each of the following physical quantities is classified as a vector or a scalar quantity. Which of the classifications is correct?
A
electric potential (Vector)
B
momentum (scalar)
C
gravitational field intensity (scalar)
D
magnetic flux density (vector)
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 #34425)
Physics
WAEC / WASSCE 2005
Units, Measurements & Dimensional Analysis
Which of the following statements about a spring balance and/or a chemical balance is not correct?
A
the chemical balance operates on the principle of moments
B
the sprin balance operates on Hooke's law
C
either may be used to measure the weight of a substance
D
the reading of a spring balance changes over the surface of the earth, while that of the chemical balance remaind constant
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 #34426)
Physics
WAEC / WASSCE 2005
Elasticity, Density, Pressure & Fluids
The friction which exists between two layers of liquid in relative motion is called
A
capillarity
B
surface tension
C
viscosity
D
cohension
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 #34427)
Physics
WAEC / WASSCE 2005
Work, Energy, Power & Simple Machines
Which of the following simple machines is a second class lever?
A
wheel barrow
B
crowbar
C
claw hammer
D
seesae
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 #34429)
Physics
WAEC / WASSCE 2005
Current Electricity & Electric Circuits
Which of the following phenomena is the practical evidence for the existence of the continual motion of molecules?
A
Translational motion
B
rotational motion
C
brownian motion
D
oscillatory motion
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 #34419)
Physics
WAEC / WASSCE 2005
Work, Energy, Power & Simple Machines
Solution
A wheel and axle of radii 800mm and 200mm respectively is used to raise a body of weight 800N by the application of 250N. Calculate the efficiency of the machine
A
85%
B
80%
C
60%
D
20%
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
V.R = \(\frac{R}{r} = \frac{800}{200} = 4\)
M.A = \(\frac{L}{E} = \frac{800}{250} = 3.2\)
y = \(\frac{M.A}{v.R} \times \frac{100}{1} = 80\)%
Source: Myschool Past Questions Archive (Record #34430)
Physics
WAEC / WASSCE 2005
Equilibrium of Forces, Moments & Flotation
Masses,m1 and m2 at the 20-cm and 65-cm marks respectively of a uniform metre rule freely suspended at its centre of gravity. If the metre rule balances horizontally, determine the ratio m2 : m1
A
2 : 1
B
3 : 3
C
2 : 3
D
1 : 2
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 #34437)