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Physics NECO SSCE 2001 Calorimetry, Latent Heat & Change of State
How much heat is required to convert 5.0g of ice at 0 ^\circ C to water at the boiling point? (Specific latent heat of ice = 336Jg-1 specific heat capacity of water = 4.2Jg-1K-1)
A
420 J
B
1680 J
C
1701 J
D
2100 J
E
3780 J
medium Difficulty
Physics NECO SSCE 2001 Atomic, Quantum, Nuclear Physics & Electronics
What gives rise to the line spectra observed in atoms?
A
change of an electron from a higher to a lower energy level in the atom
B
disturbed protons in the nucleus
C
excitation of an electron in the atom
D
kinetic energy of a moving atom
E
potential energy of an electron inside an atom
medium Difficulty
Physics NECO SSCE 2001 Current Electricity & Electric Circuits
A lead-acid accumulator is used in preference to a dry battery in a car because
A
a dry battery cannot supply the necessary high voltage
B
a dry battery would not operate on a cold frosty morning
C
the accumulator can give a bigger current and can be recharged
D
the accumulator can supply a.c
E
the chemicals used in a dry battery constitute a fire hazard.
medium Difficulty
Physics NECO SSCE 2001 Atomic, Quantum, Nuclear Physics & Electronics
A metal has a work function of 3.0 eV. What is the threshold frequency of the metal when electrons are just liberated from the metal.(1 eV = 1.6 \times 10-19J; h = 6.6 \times 10-34Js)
A
4.8 × 10-19Hz
B
9.3 × 10-7Hz
C
4.8 × 1014Hz
D
7.3 × 1014Hz
E
9.3 × 1014Hz
medium Difficulty
Physics NECO SSCE 2001 Linear Motion, Projectiles & Kinematics
A body whose initial velocity is u is uniformly accelerated to a final velocity v in t seconds. If the distance travelled is s, and the acceleration is a, which equation is INCORRECT for the motion of the body?
A
s = ut+\(\frac{1}{2}\)at2
B
v2 = u2 + 2as
C
v =u + at
D
v = u + 2as
E
s = \(\frac{1}{2}\)(u+v)t
medium Difficulty
Physics NECO SSCE 2001 Current Electricity & Electric Circuits
A cell can supply currents of 0.60 A and 0.30 A through a 2.0 ω and a 5.0 ω resistor respectively. What is the internal resistance of the cell?
A
0.2 ω
B
0.4 ω
C
1.0 ω
D
3.0 ω
E
9.0 ω
medium Difficulty
Physics NECO SSCE 2001 Atomic, Quantum, Nuclear Physics & Electronics
Which statement is a correct consequence of the uncertainly principle?
A
A particle’s kinetic energy cannot be measured accurately at any time
B
Both momemtum and energy of a particle can be known with absolute certainly
C
It is possible to measure exactly both the position and momentum of a particle at the same time
D
The complete knowledge of the position of a particle implies the complete ignorance of its energy
E
The uncertainty in our knowledge of energy and the duration taken to measure it, are each less than Planck’s constant.
medium Difficulty
Physics NECO SSCE 2001 Calorimetry, Latent Heat & Change of State
Which statements(s) is/are NOT true? I. A saturated vapour is one that is in equilibrium with its liquid in a closed space. II. A vapour contains molecules with varying kinetic energy and their distances apart are smaller than those of the molecules of a liquid III. Relative Humidity = \(\frac{\text{Saturated vapour pressure at dew point}} {\text{Saturated vapour pressure at air temperature}}\) x 100% IV. The saturated vapour pressure of water increases with temperature
A
I only
B
II only
C
II and III only
D
III and IV only
E
II, III and IV only
medium Difficulty
Physics NECO SSCE 2001 Magnetism, Electromagnetism & AC Circuits
A 220 V, 60 Hz alternating current supply is connected to an inductor of 3.5H. What is the current passing through the inductor?
A
0.0167 A
B
0.1670 A
C
1.6700 A
D
16.7000 A
E
167.0000 A
medium Difficulty
Physics NECO SSCE 2001 Current Electricity & Electric Circuits
The speed of sound travelling in various media increases in the order:
A
air, iron bar, water
B
air, water, iron bar
C
iron, bar water, air
D
water, air, iron bar
E
water, iron bar, air
medium Difficulty
Physics NECO SSCE 2001 Temperature, Thermometry & Thermal Expansion
The lower and upper fixed points of a mercury-in-glass thermometer are marked X and 180 mm respectively. On a particular day the mercury meniscus in the thermometer rises to 60mm. If the corresponding reading on a Celsius scale is 20 ° C, what is the value X?
A
6.0mm
B
18.0mm
C
30.0mm
D
60.0mm
E
120.0mm
medium Difficulty
Physics NECO SSCE 2001 Current Electricity & Electric Circuits
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
Physics NECO SSCE 2001 Current Electricity & Electric Circuits
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
Physics NECO SSCE 2001 Reflection, Refraction & Dispersion of Light
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
Physics NECO SSCE 2001 Calorimetry, Latent Heat & Change of State
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
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