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Physics
UTME / JAMB 2014
Waves, Sound & Vibrations
Solution
The distance between two successive crests of a wave is 15cm and the velocity 300ms-1. Calculate the frequency.
A
2.0x102Hz
B
4.5x103Hz
C
2.0x103Hz
D
4.5x102Hz
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Wavelength = 15cm = 0.15m
Velocity = 300m/s
V = fx
F = V/Wavelength
F = 300/0.15 Hertz
F = 2 x 103Hz
Source: Myschool Past Questions Archive (Record #26975)
Physics
UTME / JAMB 2014
Waves, Sound & Vibrations
Solution
A boy receives the echo of his clap reflected by a nearby hill 0.8s later. How far is he from the hill? [ speed of sound in air = \(340ms^{-1}\)
A
528m
B
66m
C
136m
D
264m
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Time for echo both ways = 0.8
Therefore time for echo in 1 way = 0.8/2 = 0.4
Distance = Speed x time
Distance = 340 x 0.4
Distance = 136m
Source: Myschool Past Questions Archive (Record #26976)
Physics
UTME / JAMB 2014
Lenses & Optical Instruments
Solution
An object is placed 10m from a pinhole camera of length 25cm. Calculate the linear magnification.
A
2.5x102
B
2.5x10-2
C
2.5x10-1
D
2.5x101
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(\text{Linear Magnification} = \frac{\text{Length of Camera}}{\text{Distance of the Object}}\)
\(\text{Linear Magnification} = \frac{25}{1000}\)
\(\text{Linear Magnification} = 2.5 \times 10^{-2}\)
Source: Myschool Past Questions Archive (Record #26977)
Physics
UTME / JAMB 2014
Reflection, Refraction & Dispersion of Light
Solution
The focal length of a concave mirror is 2.0cm. If an object is placed 8.0cm from it, the image is at
A
2.7m
B
2.0m
C
2.3m
D
2.5m
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(\frac{1}{U} + \frac{1}{V} = \frac{1}{f}\)
\(\frac{1}{8} + \frac{1}{V} = \frac{1}{2}\)
\(V = \frac{8}{3}\)
\(V = 2.7cm\)
Source: Myschool Past Questions Archive (Record #26978)
Physics
UTME / JAMB 2014
Lenses & Optical Instruments
In a compound microscope, the objective and the eye piece focal lengths are
A
At infinity
B
Long
C
Short
D
The same
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 #26979)
Physics
UTME / JAMB 2014
Reflection, Refraction & Dispersion of Light
When a telescope is in normal use, the final image is at
A
Infinity
B
The focus
C
The radius of curvature
D
The near point
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 #26980)
Physics
UTME / JAMB 2014
Electrostatics & Capacitors
Solution
When a negatively charged rod is brought near the cap of a charged gold leaf electroscope which has positive charges, the leaf
A
Remains the same
B
Collapses
C
Collapses and diverges again
D
Diverges
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
When a negatively charged rod is brought near the cap of a charged gold leaf electroscope which has positive charges, the leaf collapses.
Source: Myschool Past Questions Archive (Record #26981)
Physics
UTME / JAMB 2014
Electrostatics & Capacitors
Solution
What charge is stored in a 0.1F capacitor when a 10V supply is connected across it?
A
1C
B
5C
C
4C
D
2C
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Q = CV = 0.1 x 10 = 1C
Source: Myschool Past Questions Archive (Record #26982)
Physics
UTME / JAMB 2014
Current Electricity & Electric Circuits
Solution
The maximum power transfer occur in a cell when the external resistance is
A
Twice the internal resistance of the cell
B
The same as the internal resistance of the cell
C
Greater than the internal resistance of the cell
D
Less than the internal resistance of the cell
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
the maximum power transfer theorem states that the maximum power is transferred from a source e.g. cell or battery to its load (external resistance) when the resistance of the load is equal to the internal resistance of the source.
Source: Myschool Past Questions Archive (Record #26983)
Physics
UTME / JAMB 2014
Current Electricity & Electric Circuits
Solution
A circuit has a resistance of 200Ω. The resistance of the circuit can be reduced to 120Ω when
A
A 300Ω resistor is connected to it in parallel
B
An 80Ω resistor is conneceted to it in series
C
A 150Ω resistor is connected to it in parallel
D
A 240Ω resistor is connected to it in series
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
A 300Ω resistor is connected to it in parallel
Let R\(_t\) = total resistance in parallel
\(\frac{1}{R_t}\) = \(\frac{1}{R_1}\) + \(\frac{1}{R_2}\) = \(\frac{1}{200}\) + \(\frac{1}{300}\)
R\(_t\) = \(\frac{200 \times 300}{200 + 300}\) = \(\frac{6000}{500}\) = 120 \(\Omega\)
Source: Myschool Past Questions Archive (Record #26985)
Physics
UTME / JAMB 2014
Current Electricity & Electric Circuits
PHCN measures its electrical energy in
A
W
B
KWh
C
Wh
D
J
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 #26986)
Physics
UTME / JAMB 2014
Magnetism, Electromagnetism & AC Circuits
Solution
What is the best method of demagnetizing a steel bar magnet?
A
Hammering
B
Heating it
C
Rough handling it
D
Solenoid method
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Solenoid method: This involves placing the magnet inside a solenoid (an electromagnet) and gradually reducing the current. It provides a controlled environment for effective demagnetization.
Source: Myschool Past Questions Archive (Record #26987)
Physics
UTME / JAMB 2014
Magnetism, Electromagnetism & AC Circuits
The magnitude of the angle of dip at the equator is
A
360o
B
0o
C
90o
D
180o
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 #26988)
Physics
UTME / JAMB 2014
Atomic, Quantum, Nuclear Physics & Electronics
When an atom undergoes a beta decay, the atomic number of the nucleus
A
Remains unchanged
B
Decreases by one
C
Increases by one
D
Becomes zero
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 #26989)
Physics
UTME / JAMB 2014
Current Electricity & Electric Circuits
Solution
Calculate the mass of the copper deposited during electrolysis when a current of 4A passes through a copper salt for 2 hours. [Ece of Copper z=3.3x10-7kgC-1]
A
2.9x105kg
B
9.5x10-7kg
C
9.5x10-3kg
D
2.9x104kg
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Mass = ZIT kg
Mass = 3.3 x 10-7 x 4 x 2 x 60 x 60 kg
Mass = 9.5 x 10-3kg
Source: Myschool Past Questions Archive (Record #26990)