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Physics
UTME / JAMB 2013
Current Electricity & Electric Circuits
Solution
What is the velocity of sound at 100 oC if the velocity of sound at 0 oC is 340ms -1?
A
497m-1
B
440m-1
C
397m-1
D
240m-1
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\(V \propto \sqrt{T}\)
⇒ \(\frac{V_{1}}{\sqrt{T_{1}}} = \frac{V_{2}}{\sqrt{T_{2}}}\)
Using the above formula, we get
\(V_{2} \approxeq 397ms^{-1}\)
Source: Myschool Past Questions Archive (Record #27352)
Physics
UTME / JAMB 2013
Waves, Sound & Vibrations
Solution
If a sonometer has a fundamental frequency of 450HZ, what is the frequency of the fifth overtone?
A
2700Hz
B
456Hz
C
444Hz
D
75Hz
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
5th Overtone = 6fo = 6 x 450 = 2700Hz
Source: Myschool Past Questions Archive (Record #27353)
Physics
UTME / JAMB 2013
Reflection, Refraction & Dispersion of Light
Solution
A man 1.5m tall is standing 3m in front of a pinhole camera whose distance between the hole and the screen is 0.1m. What is the height of the image of the man on the screen?
A
0.05m
B
0.15m
C
0.30m
D
1.00m
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(h_i = \frac{h_o \times V}{u}\)
\(h_i = \frac{1.5 \times 0.1}{3}\)
= 0.05m
Source: Myschool Past Questions Archive (Record #27354)
Physics
UTME / JAMB 2013
Lenses & Optical Instruments
Solution
If the linear magnification of the objective and eyepiece convex lenses of a compound microscope are 4 and 7 respectively. Calculate the angular magnification of the microscope
A
2
B
3
C
11
D
28
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
M = M1 x M2 = 4 x 7 = 28
Source: Myschool Past Questions Archive (Record #27357)
Physics
UTME / JAMB 2013
Reflection, Refraction & Dispersion of Light
Solution
The angle of deviation of light of various colours passing through a triangular prism increases in the order
A
red → green → blue
B
green → violet → blue
C
blue → red → green
D
blue → green → red
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
In a triangular prism, light of different colors is refracted at different angles, with red light deviating the least and blue light deviating the most.
Source: Myschool Past Questions Archive (Record #27358)
Physics
UTME / JAMB 2013
Electrostatics & Capacitors
Solution
Calculate the force acting on an electron of charge 1.5 x 10-19C placed in an electric field of intensity 105Vm-1
A
1.5x10-11N
B
1.5x10-12N
C
1.5x10-13N
D
1.5x10-14N
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
F = qE
F = 1.5 x 10-19 x 105
F = 1.5 x 10-14N
Source: Myschool Past Questions Archive (Record #27359)
Physics
UTME / JAMB 2013
Electrostatics & Capacitors
Capacitors are used in the induction coil to
A
control circuits
B
prevent distortion of electric fields
C
prevent electric sparks
D
dissipate energy
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 #27360)
Physics
UTME / JAMB 2013
Current Electricity & Electric Circuits
Solution
A cell of emf 1.5V is connected in series with a 1Ω resistor and a current of 0.3A flows through the resistor. Find the internal resistance of the cell
A
4.0Ω
B
3.0Ω
C
1.5Ω
D
1.0Ω
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
r = \(\frac{E}{I} - R\)
r = \(\frac{1.5}{0.3} - 1\)
r = 4\(\Omega\)
Source: Myschool Past Questions Archive (Record #27361)
Physics
UTME / JAMB 2013
Atomic, Quantum, Nuclear Physics & Electronics
Which of the following obeys ohms laws?
A
electroytes
B
metals
C
diode
D
glass
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 #27362)
Physics
UTME / JAMB 2013
Current Electricity & Electric Circuits
Solution
A house has ten 40W and five 100W bulbs. How much will it cost the owner of the house to keep them lit for 10 hours if the cost of a unit is 5N?
A
N90
B
N50
C
N45
D
N5
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
P = 40 x 10 + 100 x 5
P = 400 + 500 = 900W
Cost = \(\frac{900 \times 10 \times 5}{1000}\)
Cost = N45
Source: Myschool Past Questions Archive (Record #27363)
Physics
UTME / JAMB 2013
Current Electricity & Electric Circuits
Solution
An electric device is rated 2000W, 250V. Calculate the maximum current it can take
A
9A
B
8A
C
7A
D
6A
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
I = \(\frac{P}{v}\)
I = \(\frac{2000}{250}\)
I = 8A
Source: Myschool Past Questions Archive (Record #27364)
Physics
UTME / JAMB 2013
Work, Energy, Power & Simple Machines
When a charge moves through an electric circuit in the direction of an electric force, it
A
gains both potential and kinetic energy
B
gains potential energy and lose kinetic energy
C
loses potential energy and gains kinetic energy
D
loses both potential and kinetic energy
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 #27365)
Physics
UTME / JAMB 2013
Current Electricity & Electric Circuits
Solution
To convert a galvanometer to a voltmeter, a
A
high resistance is connected to it in series
B
high resistance is connected to it in parallel
C
low resistance is connected to it in parallel
D
low resistance is connected to it in series
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
To convert a galvanometer (which measures current) into a voltmeter (which measures voltage), a high resistance is connected in series with the galvanometer. This limits the current flowing through the galvanometer, allowing it to measure higher voltages without exceeding its maximum current rating.
Source: Myschool Past Questions Archive (Record #27366)
Physics
UTME / JAMB 2013
Magnetism, Electromagnetism & AC Circuits
Induced emfs are best explained using
A
Ohm's law
B
Faraday's law
C
Colomb's law
D
Lenz's law
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 #27367)
Physics
UTME / JAMB 2013
Current Electricity & Electric Circuits
Solution
If a current of 2.5A flows through an electrolyte for 3 hours and 1.8g of a substance is deposited, what is the mass of the substance that will be deposited if a current of 4A flows through it for 4.8 hours?
A
2.4g
B
3.2g
C
4.6g
D
4.8g
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
First let's find z
z = \(\frac{M}{It}\)
z = \(\frac{1.8}{2.5 \times (3 \times 60 \times 60)}\)
Therefore, the new M equals
M = zIt
M = \(\frac{1.8 \times 4 \times 4.8 \times 60 \times 60}{2.5 \times 3 \times 60 \times 60}\)
M = 4.6g
Source: Myschool Past Questions Archive (Record #27368)