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Physics
NECO SSCE 2002
Temperature, Thermometry & Thermal Expansion
Solution
A brass cube of side 10cm is heated through 30^\circC. If the linear expansivity of brass is 2.0 \times I0\(^{-5}\) K-1 , what is the increase in its volume?
A
0.06 cm3
B
0.18cm3
C
0.60cm3
D
1.20cm3
E
1.80cm3
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
cubic expansivity and γ = 3\alpha. → 3 * 2.0 \times I0\(^{-5}\)
cubic expansivity = 6.0 \times I0\(^{-5}\) , Ø = 30^\circC,
Volume(v\(_1\)) = L\(^3\) = 10\(^3\) → 1000
V\(_2\) = V\(_1\)(1 + γ\theta)
→ V\(_2\) = 1000[1 + 6.0 \times I0\(^{-5}\) * 30]
= 1000[1 + 0.0018]
= 1000 * 1.0018 → 1,001.8
increase in volume = 1,001.8 - 1000
→ 1.8cm\(^3\)
Source: Myschool Past Questions Archive (Record #42868)
Physics
NECO SSCE 2002
Current Electricity & Electric Circuits
Which statement is NOT correct about Rutherford’s model of the atom?
A
The diameter of the nucleus is of the order of 10-15m
B
The mass of an atom is concentrated in the nucleus
C
The model is applicable to atoms with one electron in the outer shell
D
The nucleus of an atom is positively charged
E
The nucleus is surrounded by an electron cloud.
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 #42869)
Physics
NECO SSCE 2002
Temperature, Thermometry & Thermal Expansion
Solution
In which of the following are the substances arranged in descending order of their thermal conductivities?
A
aluminium, copper, iron
B
aluminium, iron, copper
C
copper, aluminium, iron
D
copper, iron. aluminium
E
iron, copper, aluminium
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
metals thermal conductivity( W/mk)
IRON 65.7
COPPER 377
ALUMINIUM 218
THERMAL CONDUCTIVITIES OF Al, Fe, and Cu at 100degree Celsius
Source: Myschool Past Questions Archive (Record #42870)
Physics
NECO SSCE 2002
Current Electricity & Electric Circuits
What part of the camera corresponds to the iris of the eye?
A
diaphragm
B
film
C
focusing ring
D
lens
E
shutter
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 #42871)
Physics
NECO SSCE 2002
Calorimetry, Latent Heat & Change of State
A block of ice of mass 10kg at 0°C absorbs heat energy from its surroundings and changes to water at the same temperature. The heat absorbed is referred to as
A
heat capacity
B
latent heat
C
specific heat
D
specific heat capacity
E
specific latent heat.
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 #42872)
Physics
NECO SSCE 2002
Circular Motion, Gravitation & Simple Harmonic Motion
Solution
A body executing a simple harmonic motion has an angular velocity of 22 radians per second. If it has a maximum displacement of 10cm, what is its linear velocity?
A
1100ms-1
B
440 ms-1
C
220 ms-1
D
22 ms-1
E
2.2ms-1
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
Amplitude[r] =10cm =0.1m.
Angular velocity[w] =22 radians per second
Linear velocity=wr
V=22\times0.1
V=2.2m/s
Source: Myschool Past Questions Archive (Record #42873)
Physics
NECO SSCE 2002
Work, Energy, Power & Simple Machines
In which simple machine is the effort applied between the load and the fulcrum?
A
claw hammer
B
nut crackers
C
pliers
D
sugar tongs
E
wheelbarrow
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 #42874)
Physics
NECO SSCE 2002
Equilibrium of Forces, Moments & Flotation
A body of weight 20N displaces 12N of the liquid in which it is immersed. What is the upthrust of the liquid on the body?
A
240N
B
32N
C
20N
D
12N
E
8N
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 #42875)
Physics
NECO SSCE 2002
Current Electricity & Electric Circuits
Solution
If the temperature of a resistance wire is gradually increased, its resistance will
A
decrease gradually
B
first increase and then decrease
C
first increase and then remain the same
D
increase gradually
E
remain the same
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
In a metallic resistance wire (a conductor), as the temperature increases, the atoms vibrate more, causing more collisions with the free electrons. This increases the wire's resistance to the flow of current.
Source: Myschool Past Questions Archive (Record #42876)
Physics
NECO SSCE 2002
Reflection, Refraction & Dispersion of Light
Solution
If the size of the hole of a pinhole camera is increased, the image formed becomes
A
brighter and blurred
B
brighter and larger
C
brighter and sharper
D
blurred and duller
E
blurred and larger
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
If the size of the hole in a pinhole camera is increased, the image formed becomes blurred and larger. This happens because a larger hole allows more light to enter, creating a larger image. However, the increased size also causes a wider range of rays from different points to converge, resulting in a loss of sharpness and a blurred image. Thus, the image is both larger and blurrier.
Source: Myschool Past Questions Archive (Record #42877)
Physics
NECO SSCE 2002
Waves, Sound & Vibrations
A man stands in front f a high wall and produces a sound. If he receives the echo of the sound four seconds later, what is his distance from the wall? [The speed of sound in air is 330ms-1]
A
1320m
B
660m
C
400m
D
330m
E
165m
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 #42878)
Physics
NECO SSCE 2002
Electrostatics & Capacitors
Solution
A negatively charged rod is brought near the cap of an electroscope. The cap is earthed momentarily while the charge is near to it. The rod is then removed. Which statement is correct?
A
The cap will be positively charged and the leaf will be negatively charged
B
The cap will be negatively charged and the leaf will be positively changed
C
The cap and the leaf will be positively charged
D
The cap and the leaf will be negatively charged
E
none
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
When a negatively charged rod is brought near an electroscope, it repels electrons, making the cap positively charged and the leaves negatively charged. If the cap is earthed while the rod is near, electrons flow in, neutralizing some positive charge and making the cap negatively charged. After removing the rod and disconnecting the earthing, the cap retains extra electrons and remains negatively charged, while the leaves may also be negatively charged depending on their electron loss. Thus, both the cap and the leaves are negatively charged.
Source: Myschool Past Questions Archive (Record #42879)
Physics
NECO SSCE 2002
Reflection, Refraction & Dispersion of Light
If the refractive index of water is 1.33, what is the critical angle for a water-air boundary?
A
36.0 °
B
40.2 °
C
41.8 °
D
48.8 °
E
62.7 °
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 #42880)
Physics
NECO SSCE 2002
Calorimetry, Latent Heat & Change of State
What does NOT affect the rate of evaporation of a liquid
A
exposed surface area of the liquid
B
humidity of the surroundings
C
nature of the liquid
D
temperature the liquid
E
volume of the liquid.
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 #42881)
Physics
NECO SSCE 2002
Current Electricity & Electric Circuits
The use of electrical fuses in domestic wiring is
A
to prevent and electrical shock
B
to supply electricity to all the electrical appliances
C
to allow electricity to flow easily through the mains to all the circuits
D
to cut off the mains supply it too high a current flows
E
to fuse all the circuit into one
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 #42882)