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Physics
NECO SSCE 2003
Current Electricity & Electric Circuits
Which of the following instruments can be used to measure e.m.f. most accurately.
A
Ammeter
B
Galvanometer
C
Metre bridge
D
Potentiometer
E
Voltmeter
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 #42906)
Physics
NECO SSCE 2003
Calorimetry, Latent Heat & Change of State
Evaporation of a liquid produces cooling of the liquid because the
A
attraction between the vapour molecules and the liquid molecules is great
B
average kinetic energy of the liquid is reduced
C
density of the liquid decreases
D
vapour pressure above the liquid rises
E
volume of the liquid decreases
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 #42907)
Physics
NECO SSCE 2003
Magnetism, Electromagnetism & AC Circuits
Calculate the amount of heat generated in an external load of resistance 8Ω if an alternating current of peak value 5 A is passed through it for 100s.
A
2.0 × 104J
B
1.0 × 104J
C
5.0 × 103J
D
4.0 × 103J
E
2.0 × 102J
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 #42908)
Physics
NECO SSCE 2003
Work, Energy, Power & Simple Machines
A machine has an efficiency of 80%. If the machine is required to overcome a load of 60N with a force of 40N, calculate its velocity ratio.
A
0.53
B
0.83
C
1.20
D
1.50
E
1.88
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 #42909)
Physics
NECO SSCE 2003
Newton's Laws, Momentum & Collisions
For which of the following sets are the units fundamental?
A
Area, length and volume
B
Impulse, mass and time
C
Length, time and mass
D
Velocity, distance and time
E
Volume, mass and density
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 #42910)
Physics
NECO SSCE 2003
Calorimetry, Latent Heat & Change of State
How much heat is required to convert 50g of water at 100°C to steam at the same temperature? (Specific latent heat of vaporization of water = 2260 Jg-11)
A
1.13 × 10-4J
B
1.31 × 102J
C
1.30 × 104J
D
1.13 × 105J
E
1.31 × 106J
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 #42911)
Physics
NECO SSCE 2003
Waves, Sound & Vibrations
Which of the following radiations have the longest wavelength?
A
Gamma rays
B
Infra-red
C
Light waves
D
Radio waves
E
Ultra-violet rays
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 #42912)
Physics
NECO SSCE 2003
Current Electricity & Electric Circuits
Lines of force
I. Begin and end on equal and opposite electric charges.
II. are in state of tension which causes them to shorten
III. attract one another.
Which of the statement(s) is/are correct?
A
I only
B
II only
C
III only
D
I and II only
E
II and III only
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 #42913)
Physics
NECO SSCE 2003
Current Electricity & Electric Circuits
Solution
A wire of length 100cm and cross-sectional area 2.0 \times 10-3cm2 has a resistance of 0.10 \omega. Calculate its electrical conductivity.
A
2.0 × 10-6 ω-1cm-1
B
5.0 × 105 ω-1cm-1
C
2.0 × 106 ω-1cm-1
D
5.0 × 10-6 ω-1cm-1
E
5.0 × 107 ω-1cm-1
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Electrical conductivity = the reciprocal of resistivity
but resistivity(ρ) = \(\frac{R\times A}{L}\)
resistivity(ρ) = \(\frac{ 2.0 \times 10^{-3} \times0.1}{100}\) = 0.000002
electrical conductivity(σ) = \(\frac{1}{ρ}\)
σ = \(\frac{1}{0.000002} = 500000\omega^{-1}cm^{-1}\)
Source: Myschool Past Questions Archive (Record #42914)
Physics
NECO SSCE 2003
Atomic, Quantum, Nuclear Physics & Electronics
Solution
\(^{226}_{88}Ra\) \(\to\) \(^{222}_{86}Rn\) + X + Energy. The equation above represents a nuclear decay of radium isotope. What is X?
A
Alpha particle
B
Beta particle
C
Gamma ray
D
Neutron
E
X – ray
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Mass Number: The mass number on the left side is 226 (from Ra) and 222 (from Rn) on the right side. Let A be the mass number of X:
226 = 222 + A ⇒ A = 226 - 222 = 4
Atomic Number: The atomic number on the left side is 88 (for Ra) and 86 (for Rn) on the right side. Let Z be the atomic number of X:
88 = 86 + Z ⇒ 88 - 86 = 2
Therefore, X is an alpha particle.
Source: Myschool Past Questions Archive (Record #42915)
Physics
NECO SSCE 2003
Current Electricity & Electric Circuits
A body that produces its own light is said to be
A
luminous
B
non-incandescent
C
opaque
D
translucent
E
transparent
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 #42916)
Physics
NECO SSCE 2003
Electrostatics & Capacitors
Solution
Two equal capacitances are connected first in series and then in parallel. The ratio of the effective series capacitance to the effective parallel capacitance is
A
0.25
B
0.50
C
1.00
D
2.20
E
4.00
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Assume the two equal capacitors are 2 micro-farads respectively( you can assume any number)
Effective capacitor in series = \(\frac{1}{C_1} + \frac{1}{C_2}\)
= \(\frac{1}{2} + \frac{1}{2}\) = \(\frac{2}{2}\) = 1 micro-farads
Effective capacitance in parallel = \(C_1 + C_2\) = 2 + 2 = 4 micro-farads
The ratio of the effective series capacitance to the effective parallel capacitance = 1: 4 = \(\frac{1}{4}\) = 0.25
Source: Myschool Past Questions Archive (Record #42917)
Physics
NECO SSCE 2003
Magnetism, Electromagnetism & AC Circuits
The resistance of a series R-C circuit is 5 ω If the impedance of the circuit is 13 ω calculate the reactance of the capacitor
A
12 Ω
B
14 Ω
C
16 Ω
D
18 Ω
E
65 Ω
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 #42918)
Physics
NECO SSCE 2003
Current Electricity & Electric Circuits
The motion of the prongs of a sounding turning fork is
A
circular
B
oscillatory
C
random
D
rotational
E
translational
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 #42919)
Physics
NECO SSCE 2003
Newton's Laws, Momentum & Collisions
Solution
A constant force of 5N acts for 5s on a mass of 5kg initially at rest. Calculate the final momentum of the mass.
A
125 kgms-1
B
75 kgms-1
C
25 kgms-1
D
20 kgms-1
E
5 kgms-1
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
According to Newton's second law of motion, \(force = \frac{ final momentum - initial momentum}{time}\)
but momentum = mass x velocity; F= 5N, Initial mass = 5kg, time = 5secs, initial velocity = zero
then final momentum = force x time (since initial momentum of the mass = 0, that is 5 x 0)
= 5 x 5 = 25 kgms-1
Source: Myschool Past Questions Archive (Record #42920)