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Physics
NECO SSCE 2005
Circular Motion, Gravitation & Simple Harmonic Motion
Which of the following will reduce the frequency of oscillation of a simple pendulum?
A
Decreasing the length of the string
B
Increasing the amplitude of oscillation
C
Increasing the length of the string
D
Increasing the mass of the bob
E
Reducing the mass of the bob.
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 #43027)
Physics
NECO SSCE 2005
Work, Energy, Power & Simple Machines
A box is pulled a distance s along a smooth horizontal floor by a force of magnitude F, inclined at an angle θ to the horizontal. The work done is
A
Fs cos θ
B
Fs cosec θ
C
Fs sec θ
D
Fs sin θ
E
Fs tan θ
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 #43028)
Physics
NECO SSCE 2005
Waves, Sound & Vibrations
Solution
A radio station broadcasts at a frequency of 400 kHz. If the speed of the wave is 3.0 \times10\(^{-8}\)ms\(^{-1}\), calculate the wavelength of the radio wave.
A
1.3 × 102m
B
3.0 × 102m
C
2.4 × 102m
D
5.0 × 102m
E
7.5 × 10-14m
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
To calculate the wavelength of a radio wave, we use the formula:
\(\lambda = \frac{v}{f}\)
where:
- \( v \) is the speed of the wave,
- \( f \) is the frequency.
Given:
- Frequency \( f = 400 \, \text{kHz} = 400 \times 10^3 \, \text{Hz} \)
- Speed \( v = 3.0 \times 10^{-8} \, \text{m/s} \)
Substituting the values into the formula:
\(\lambda = \frac{3.0 \times 10^{-8} \, \text{m/s}}{400 \times 10^3 \, \text{Hz}}\)
Calculating:
\(\lambda = \frac{3.0 \times 10^{-8}}{4.0 \times 10^5}\)
\(\lambda = 7.5 \times 10^{-14} \, \text{m}\)
Thus, the wavelength of the radio wave is:
\(\lambda = 7.5 \times 10^{-14} \, \text{m}\)
Source: Myschool Past Questions Archive (Record #43029)
Physics
NECO SSCE 2005
Waves, Sound & Vibrations
Which of the following is/are longitudinal wave(s)?
I. Light waves from the sun
II. Sound waves in the air
III. Waves on a vibrating string
A
I only
B
II only
C
I and II only
D
I and III only
E
II and III only
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 #43030)
Physics
NECO SSCE 2005
Waves, Sound & Vibrations
Which of the following radiations has the shortest wavelength?
A
Infrared rays
B
Light waves
C
Microwaves
D
Ultraviolet rays
E
X-rays
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 #43031)
Physics
NECO SSCE 2005
Current Electricity & Electric Circuits
Solution
Which of the following statements is/are correct? Sound waves travel through
I. air
II. vacuum
III.Water
A
II only
B
I and II only
C
II and III only
D
I and III only
E
I, II, and III
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Sound travels in air and water. However, in a vacuum, sound moves at 0 m/s. Hence, it doesn't travel in a vacuum.
Source: Myschool Past Questions Archive (Record #43032)
Physics
NECO SSCE 2005
Current Electricity & Electric Circuits
An electric motor primary converts
A
electrical energy to chemical energy
B
electrical energy to heat energy
C
electrical energy to mechanical energy
D
mechanical energy to electrical energy
E
mechanical energy to light 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 #43033)
Physics
NECO SSCE 2005
Electrostatics & Capacitors
Radio receivers are tuned using
A
electromagnets
B
electric motors
C
Inductors
D
variable capacitors
E
variable resistors
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 #43034)
Physics
NECO SSCE 2005
Current Electricity & Electric Circuits
Three non-parallel coplanar forces which can be represented both in magnitude and direction by the three sides of a triangle taken in order will
A
have any one force being the equilibrant of the other two
B
make a body move randomly
C
make a body oscillate
D
move a body along a straight line
E
rotate a body about its axis
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 #43035)
Physics
NECO SSCE 2005
Current Electricity & Electric Circuits
A constant force acts on a body of mass 50kg and changes its speed from 20ms-1 to 90ms-1 in 10 seconds. Calculate the magnitude of the force applied.
A
590N
B
500N
C
450N
D
350N
E
180N
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 #43036)
Physics
NECO SSCE 2005
Current Electricity & Electric Circuits
The motion of the wheel of a bicycle moving on a smooth straight road is
A
oscillatory and random
B
oscillatory and translational
C
rotational and oscillatory
D
rotational and random
E
rotational and translational
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 #43038)
Physics
NECO SSCE 2005
Circular Motion, Gravitation & Simple Harmonic Motion
Solution
The amplitude of oscillation of a simple pendulum bob diminishes slowly because
A
energy is applied by some external agencies
B
frictional forces dissipate the energy of motion
C
the frequency of oscillation increases with the mass of the bob
D
the frequency of oscillation varies with time
E
the period of oscillation varies with time.
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
The amplitude and the frequency of an oscillating pendulum decrease gradually with time.
Source: Myschool Past Questions Archive (Record #43040)
Physics
NECO SSCE 2005
Atomic, Quantum, Nuclear Physics & Electronics
Solution
The wave theory of light does not explain photoelectricity because
A
light waves carry little energy
B
particles cannot be emitted by waves
C
the frequency of light waves too high
D
there is a threshold wavelength for electron emission
E
the wavelength of Light waves is too short.
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
According to wave theory, after the light falls on a substance electrons are emitted after a small instant of time. However, in photoelectric effect, the electron emissions are immediate without a time delay.
The energy of a wave increases with increase in intensity. However, in photoelectirc effect, increase in intensity has no effect on the energy of electrons emitted. All that happens is the number of electrons emitted, increases.he energy of a wave grows as its intensity increases. In the photoelectronic effect, however, increasing the intensity has no influence on the energy of electrons released.
Source: Myschool Past Questions Archive (Record #43041)
Physics
NECO SSCE 2005
Units, Measurements & Dimensional Analysis
The most suitable instrument for measuring the diameter of a thin wire is a
A
meter rule
B
micrometer screw gauge
C
pair of dividers
D
pair of engineer’s calipers
E
venire calipers
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 #43067)
Physics
NECO SSCE 2005
Units, Measurements & Dimensional Analysis
The most suitable instrument for measuring the diameter of a thin wire is a
A
meter rule
B
micrometer screw gauge
C
pair of dividers
D
pair of engineer’s calipers
E
venire calipers
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: Official Exam / Past Question Archive