Question Library
Browse, filter, and study verified past examination questions with step-by-step mathematical reasoning.
Searching 18,000+ Questions...
Sifting topics, KaTeX formulas & verified solutions
Showing 18376–18390 of 29821 verified questions
Sort by:
Physics
NECO SSCE 2001
Lenses & Optical Instruments
Solution
When an astronomical telescope is in normal adjustment, the focal length of the objective lens is 50cm and that of the eye piece is 5.0cm. What is the distance between the lenses?
A
10.0cm
B
30.0cm
C
45.0cm
D
55.0cm
E
250.0cm
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
An astronomical telescope is said to be in NORMAL adjustment when the distance between the objective lens and the eyepiece equals the sum of their focal lengths.
hence,
D = \(F_e\) + \(F_o\)
= 50cm + 5cm
= 55cm
Source: Myschool Past Questions Archive (Record #42841)
Physics
NECO SSCE 2001
Magnetism, Electromagnetism & AC Circuits
Solution
The main function of the commutator in a simple d.c. motor is to
A
enable the armature to rotate freely
B
increase the flux linking the armature windings
C
maintain a direct current in the armature
D
provide uniform magnetic field around the armature
E
reverse the direction of the current in the armature.
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
Reverse the direction of the current in the armature: This ensures that the magnetic forces acting on the armature continue to produce torque in the same rotational direction, allowing for continuous motion.
Source: Myschool Past Questions Archive (Record #42842)
Physics
NECO SSCE 2001
Current Electricity & Electric Circuits
An object 3.00m high is placed at a distance of 7.50m from a pin-hole camera. If the image height is 6.00 cm, what is the distance of the film from the pin-hole?
A
3.75cm
B
7.50cm
C
15.00cm
D
30.00cm
E
150.00 cm
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 #42843)
Physics
NECO SSCE 2001
Atomic, Quantum, Nuclear Physics & Electronics
Solution
The falling of light energy on a metal such that electrons are liberated from the metal is called
A
electron effect
B
metal electron effect
C
metal emission
D
photoelectric effect
E
photoemission
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
Under specific circumstances, electrons can be emitted out of the surface of a solid, when light strikes it. This is called the Photoelectric effect. It is also referred to as Photoemission or Photoelectric Emission.
Source: Myschool Past Questions Archive (Record #42844)
Physics
NECO SSCE 2001
Magnetism, Electromagnetism & AC Circuits
Solution
A transformer is connected to a 250 V a.c. supply. The primary coil has 5000 turns and the secondary voltage is found to be 10 V. What is the number of turns in the secondary coil?
A
100
B
150
C
200
D
250
E
300
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
To find the number of turns in the secondary coil of a transformer, we use the transformer equation:
\(\frac{V_p}{V_s} = \frac{N_p}{N_s}\)
Given:
\( V_p = 250 \, \text{V}\)
\( V_s = 10 \, \text{V} \)
\( N_p = 5000 \, \text{turns} \)
Rearranging the equation to find \( N_s \):
\(N_s = N_p \times \frac{V_s}{V_p}\)
Plugging in the values:
\(N_s = 5000 \times \frac{10}{250}\)
\(N_s = 5000 \times 0.04\)
\(N_s = 200 \, \text{turns}\)
Therefore, the number of turns in the secondary coil is 200.
Source: Myschool Past Questions Archive (Record #42845)
Physics
NECO SSCE 2001
Current Electricity & Electric Circuits
Solution
Which statement is TRUE of a block of stone of mass m, with zero momentum?
A
The acceleration of the stone is non-uniform
B
The stone is stationary
C
The stone moves at a constant velocity
D
The stone moves with maximum velocity
E
The stone moves with minimum velocity.
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Momentum p = mv
If the momentum is zero, and the mass m is not zero, then: v = 0. This means the stone is not moving.
Source: Myschool Past Questions Archive (Record #42846)
Physics
NECO SSCE 2001
Electrostatics & Capacitors
An electron of charge a = 1.6 × 10-19C is situated in a uniform electric field of intensity 2.4 × 105 V m-1. What is the force on the electron?
A
1.60 × 10-19N
B
3.84 × 1019N
C
1.92 × 10-14N
D
3.84 × 10-14N
E
7.68 × 10-14N
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 #42847)
Physics
NECO SSCE 2001
Scalars, Vectors & Relative Motion
Which is NOT one of the laws of solid friction?
A
The frictional force between two surfaces opposes their relative motion
B
The ratio of frictional force to the normal reaction varies for two given surfaces
C
The ratio of frictional force to the normal reaction is constant for two given surfaces
D
The limiting frictional force is independent of the area of surface in contact.
E
Dynamic frictional force is independent of the relative velocity of the surfaces in contact.
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 #42848)
Physics
NECO SSCE 2001
Lenses & Optical Instruments
What part of a camera functions in a similar way to the retina of the eye?
A
diaphragm
B
film
C
focusing ring
D
lens
E
shutter
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 #42849)
Physics
NECO SSCE 2001
Current Electricity & Electric Circuits
Solution
An astronaut is walking on the moon where the magnitude of the acceleration due to gravity "g’ is one-sixth that on earth. Compared with their magnitudes on the earth, his mass and weight on the moon are
A
both less
B
less and the same respectively
C
the same and less respectively
D
the same as on earth
E
both greater.
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
On the moon, the astronaut's mass remains unchanged, while his weight is one-sixth (\(\frac{1}{6}\)) of its value on Earth
Source: Myschool Past Questions Archive (Record #42850)
Physics
NECO SSCE 2001
Current Electricity & Electric Circuits
Which statement is NOT correct about molecules?
A
The number of molecules in a unit volume of a solid is greater than that in a unit volume of a liquid or gas.
B
Molecules are made up of atoms
C
The force of attraction between two molecules of a solid is greater than that between two molecules of a liquid or gas
D
Molecules of gases are in regular motion
E
Molecules of a solid vibrate about their mean positions.
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 #42851)
Physics
NECO SSCE 2001
Gas Laws & Heat Transfer
The inside of a vacuum flask is usually coated with silver to reduce heat loss by
A
condensation
B
conduction
C
convection
D
evaporation
E
radiation
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 #42852)
Physics
NECO SSCE 2001
Circular Motion, Gravitation & Simple Harmonic Motion
What is the angular velocity of an object in a horizontal circular path of radius 1.5m with a constant speed of 12ms-1?
A
1.6 rads-1
B
4.0 rads-1
C
8.0 rads-1
D
16.0rads-1
E
32.0 rads-1
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 #42853)
Physics
NECO SSCE 2001
Waves, Sound & Vibrations
Solution
A wave is represented by the equation y = 0.5 sin 0.4\pi(X - 60t), where the distance (X) is measured in centimetres and time (t) in seconds. What is the wavelength of the wave?
A
0.2cm
B
0.4cm
C
0.8cm
D
5.0cm
E
10.0cm
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
The general equation for a wave is given by y = Asin(k(x−vt)), where A is the amplitude, k is the wave number, v is the wave speed, and x and t are the position and time, respectively.
The wave number k is related to the wavelength \lambda by the equation k = \(\frac{2\pi}{\lambda}\)
In the given wave equation, y=0.5sin(0.4\pi(x−60t)), the wave number k is 0.4\pi.
Setting k = \(\frac{2\pi}{\lambda}\) equal to 0.4\pi and solving for \lambda gives:
\lambda = \(\frac{2\pi}{0.4\pi}\) = 5cm
So, the wavelength of the wave is 5 cm.
Source: Myschool Past Questions Archive (Record #42854)
Physics
NECO SSCE 2001
Current Electricity & Electric Circuits
The magnetic effect of a current-carrying coil is NOT utilized in the making of a/an
A
carbon microphone
B
electric bells
C
magnetic relay
D
telephone earpiece
E
thermostat
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 #42855)