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Physics
NECO SSCE 2001
Mechanics and Properties of Matter
Solution
When water is heated between 0^\circC and 4^\circC, it's density
A
increases for a while and then decreases
B
decreases for a while and then increases
C
increases
D
decreases
E
remains constant.
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Water exhibits a unique property known as anomalous expansion between 0^\circC and 4^\circC.
When water is heated from 0^\circC, its density increases and reaches a maximum at approximately 4^\circC (precisely 3.98^\circC). This means the volume actually decreases slightly in this temperature range.
Beyond 4^\circC, the density begins to decrease as normal thermal expansion occurs, and the volume increases with further rise in temperature.
This unusual behaviour is why water is densest at 4^\circC.
Source: Myschool Past Questions Archive (Record #42837)
Physics
NECO SSCE 2001
Electricity and Magnetism
If N.E.P.A. charges 65 kobo per kilowatt-hour for electricity supplied to consumers, what bill would an electric iron rated at 750 watts attract when used for 24 hours?
A
N9.70
B
N11.70
C
N12.40
D
N15.90
E
N17.60
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 #42838)
Physics
NECO SSCE 2001
Waves and Optics
An object is placed 15cm in front of a concave mirror of focal length 20cm. The image formed is
A
real, inverted and diminished
B
real, inverted and magnified
C
virtual, erect and diminished
D
virtual, erect and magnified
E
virtual, inverted and magnified
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 #42839)
Physics
NECO SSCE 2001
Thermal Physics
Given the same amount of beat, a quantity of water will reach a higher temperature in a brass pot than in a clay pot of the same mass because
A
brass is less dense than clay
B
clay expands more slowly than brass
C
clay loses heat faster than brass
D
the specific heat capacity of brass is higher than that of clay
E
the specific heat capacity of brass is lower than of clay.
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 #42840)
Physics
NECO SSCE 2001
Waves and Optics
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
Mechanics and Properties of Matter
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
Heat Energy & Temperature
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
Mechanics and Properties of Matter
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
Electricity and Magnetism
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
Mechanics and Properties of Matter
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
Mechanics and Properties of Matter
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
Heat Energy & Temperature
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
Heat Energy & Temperature
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
Mechanics and Properties of Matter
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
Heat Energy & Temperature
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)