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Physics
NECO SSCE 2003
Heat Energy & Temperature
Which of the following statement(s) is/are correct about the isotopes of an elements? They have the same
I. chemical properties
II. nucleon number
III proton number
A
I only
B
II only
C
I and II only
D
I and III only
E
I,II and III
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 #42941)
Physics
NECO SSCE 2003
Electricity and Magnetism
Lenz’s law of electromagnetic induction states that
A
a force is exerted on a current carrying conductor in a magnetic field
B
the induced current in a conductor is in such a direction as to oppose the change producing it
C
the magnitude of the induced electromotive force in a circuit is proportional to the rate of change of the number of lines of force linking the circuit
D
the magnitude of the induced electromotive force is proportional to the current producing the magnetic flux
E
whenever there is a change in the magnetic flux linked with the circuit, an electromotive is induced
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 #42942)
Physics
NECO SSCE 2003
Waves and Optics
Solution
An object is placed 30 cm in front of a concave mirror of focal length 20cm. Calculate the distance between the object and the image.
A
90cm
B
40cm
C
30cm
D
20cm
E
10cm
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Given:Object distance, \( u = 30 \,\text{cm} \)
Focal length of concave mirror, \( f = 20 \,\text{cm} \)
Using the mirror sign convention for a concave mirror:
\(u = -30 \,\text{cm}, \quad f = -20 \,\text{cm}\)
Using: \(\frac{1}{f} = \frac{1}{u} + \frac{1}{v}\)
Substitute values:
\(\frac{1}{-20} = \frac{1}{-30} + \frac{1}{v}\)
\(\frac{1}{v} = -\frac{1}{20} + \frac{1}{30}\)
=\(\frac{-3 + 2}{60}\)
= -\(\frac{1}{60}\)
\(v = -60 \,\text{cm}\)
Distance between object and image:
\(= |v - u| = |-60 - (-30)| = 30 \,\text{cm}\)
Source: Myschool Past Questions Archive (Record #42943)
Physics
NECO SSCE 2003
Waves and Optics
Which of the following properties is NOT exhibited by sound waves?
A
Diffraction
B
interference
C
Polarisation
D
Reflection
E
Refraction
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 #42944)
Physics
NECO SSCE 2003
Waves and Optics
An evidence of the wave nature of matter is
A
Browniam motion
B
Compton effect
C
diffraction
D
diffusion
E
photo electricity
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 #42945)
Physics
NECO SSCE 2003
Heat Energy & Temperature
J.J. Thomson’s model of the atom was abandoned because
A
it could not explain the scattering of alpha particles
B
it did not account for the neutron
C
it did not account for the size of the atom
D
it was known as plum-pudding model
E
the model was not similar to any observable phenomena
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 #42946)
Physics
NECO SSCE 2003
Thermal Physics
Water in an open container boils at a lower temperature when heated at the top of a mountain than at sea-level because at the top of a mountain
A
pressure is increased
B
pressure is reduced
C
the rays of the sun add more heat to the water
D
the saturation vapour pressure of water is higher than at sea-level
E
the temperature is lower than at sea-level
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 #42947)
Physics
NECO SSCE 2003
Mechanics and Properties of Matter
The volume of a given mass of gas is 40cm3 at 27° C. What is its volume at 90° C if its pressure remains constant?
A
32.84cm3
B
40.02cm3
C
48.40cm3
D
57.44cm3
E
72.84cm3
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 #42948)
Physics
NECO SSCE 2003
Heat Energy & Temperature
Which of the following statements is NOT true?
A
A lead-acid accumulator can deliver a large current because of its very large internal resistance.
B
A secondary cell can be recharged.
C
As a lead-acid accumulator is being charged, the density of the acid in it increases.
D
The chemical action in a primary cell is irreversible.
E
The conventional current in a circuit rlows from the positive to the negative terminal of the battery.
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 #42949)
Physics
NECO SSCE 2003
Heat Energy & Temperature
A sheet of white paper viewed through blue glass appears blue because
A
blue is a primary colour
B
the glass absorbs all colours except the blue colour
C
the glass reflects blue colour
D
the paper reflects blue colour only
E
white light is easily absorbed by the glass
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 #42950)
Physics
NECO SSCE 2003
Heat Energy & Temperature
A sheet of white paper viewed through blue glass appears blue because
A
blue is a primary colour
B
the glass absorbs all colours except the blue colour
C
the glass reflects blue colour
D
the paper reflects blue colour only
E
white light is easily absorbed by the glass
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
Chemistry
NECO SSCE 2003
Matter & Separation Techniques
Which statement is NOT true about the composition of starch?
A
It contains only the atoms of carbon, hydrogen oxygen
B
It is a polysaccharide
C
Its empirical formula is C2H20.
D
It is made from the monomerC6H12O6.
E
The hydrogen and oxygen atoms are in the ratio 2:1.
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #43402)
Chemistry
NECO SSCE 2003
Matter & Separation Techniques
Chlorine is used in water purification because it
A
bleaches impurities in the water
B
decolorizes water
C
destroys bacteria
D
is extremely soluble in water
E
is pleasant tasting
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #43403)
Chemistry
NECO SSCE 2003
Stoichiometry & Mole Concept
Solution
The number of hydrogen ions in 1.0dm\(^3\) of a 0.25 mole tetraoxosulphate(Vl) acid solution is
[Avogadro constant = 6.02 x 10\(^{23}\)]
A
1.45x1023
B
1.50 x l023
C
3.00x1023
D
3.15x1023
E
6.00x1023
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Given :
Number of moles = 0.25 mole, Avogadro number = 6.02 x 10\(^{23}\) Number of ions = ?
Recall that Number of moles = \(\frac{Number of ions}{Avogadro number}\)
0.25 = \(\frac{Number of ions}{6.02 x 10\(^{23}\)}\)
Number of ions = 0.25 x 6.02 x 10\(^{23}\)
=1.50 x 10\(^{23}\)
Source: Myschool Past Questions Archive (Record #43415)
Chemistry
NECO SSCE 2003
Atomic Structure and Periodic Table
Solution
B is an isotope of the element \(^{238} _{92}Ur\). The isotope B has
A
46 protons and 119 neutrons
B
92 protons and 92 neutrons
C
92 protons and 146 neutrons
D
92 protons and 238 neutrons
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
The element \(^{238} _{92}Ur\) ⇒ Mass number = 238
Atomic number = 92
Recall that Mass number = Number of protons + Number of neutrons while atomic number = number of protons
So, Mass number = Number of protons + Number of neutrons
238 = 92 + Number of neutrons
Number of neutrons = 238 - 92 = 146 neutrons
Number of protons = 92
Therefore, there are 92 protons and 146 neutrons - Option C
Source: Myschool Past Questions Archive (Record #43417)