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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)
Physics
UTME / JAMB 2014
Atomic, Quantum, Nuclear Physics & Electronics
Which gas produces a red coloured light in a discharge tube?
A
Mercury
B
Argon
C
Air
D
Neon
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 #26991)
Physics
UTME / JAMB 2014
Units, Measurements & Dimensional Analysis
Which of the following is NOT a Fundamental S.I unit?
A
Metre
B
Ampere
C
Newton
D
Second
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 #26992)
Physics
UTME / JAMB 2014
Atomic, Quantum, Nuclear Physics & Electronics
When \(^{210}_{82}Pb\) decays to \(^{206}_{80}Pb\), it emits
A
two alpha and two beta particles
B
an alpha particle
C
one beta particle
D
one alpha and one beta particle
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 #26993)
Physics
UTME / JAMB 2014
Current Electricity & Electric Circuits
What type of reaction is represented by the equation \(^{2}_{1}X+^{2}_{1}X\rightarrow^{3}_{2}Y+^{1}_{0}n+Energy\)
A
Ionization
B
Fusion
C
Fission
D
Chain
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 #26994)
Physics
UTME / JAMB 2014
Temperature, Thermometry & Thermal Expansion
Solution
A glass bottle of initial volume 2 x 10\(^4\) cm\(^3\) is heated from 20ºC to 50ºC. If the linear expansivity of glass is 9 x 10\(^{-6}\)K\(^{-1}\), the volume of the bottle at 50ºC is
A
20016.2cm3
B
20005.4cm3
C
20008.1cm3
D
20013.5cm3
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(\gamma = \frac{V_2 - V_1}{V(\theta)}\)
\(3(9 \times 10^4) = \frac{V_2 - 2 \times 10^4}{2 \times 10^4(30)}\)
V\(_2\) - 2 x 10\(^4\) = 2 x 10\(^4\) (30) x 3 (9 x 10\(^{-6}\))
V\(_2\) = 2 x 10\(^4\) (30) x 3 (9 x 10\(^{-6}\)) + 2 x 10\(^4\)
V\(_2\) = 16.2 + 2 x 10\(^4\)
V\(_2\) = 20016.2cm3
Source: Myschool Past Questions Archive (Record #26995)
Physics
UTME / JAMB 2014
Temperature, Thermometry & Thermal Expansion
Solution
A glass bottle of initial volume 2 x 10\(^4\) cm\(^3\) is heated from 20ºC to 50ºC. If the linear expansivity of glass is 9 x 10\(^{-6}\)K\(^{-1}\), the volume of the bottle at 50ºC is
A
20016.2cm3
B
20005.4cm3
C
20008.1cm3
D
20013.5cm3
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(\gamma = \frac{V_2 - V_1}{V(\theta)}\)
\(3(9 \times 10^4) = \frac{V_2 - 2 \times 10^4}{2 \times 10^4(30)}\)
V\(_2\) - 2 x 10\(^4\) = 2 x 10\(^4\) (30) x 3 (9 x 10\(^{-6}\))
V\(_2\) = 2 x 10\(^4\) (30) x 3 (9 x 10\(^{-6}\)) + 2 x 10\(^4\)
V\(_2\) = 16.2 + 2 x 10\(^4\)
V\(_2\) = 20016.2cm3
Source: Official Exam / Past Question Archive
Physics
WAEC / WASSCE 2014
Equilibrium of Forces, Moments & Flotation
A ball falling through a viscous liquid is acted upon by
A
upthrust only
B
upthrust and the ball's weight
C
the ball's weight and viscous force
D
upthrust, the ball's weight and viscous force
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 #35737)
Physics
WAEC / WASSCE 2014
Circular Motion, Gravitation & Simple Harmonic Motion
An object of mass m moves with a uniform speed v round a circular path of radius r. If its angular speed is \(\omega\), the magnitude of the centripetal force acting on it is
A
\(m \omega^2 r\)
B
\(\frac{mv^2}{r}\)
C
\(m \omega r\)
D
\(\frac{mv^2}{r^2}\)
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 #35738)