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Physics
NECO SSCE 2004
Scalars, Vectors & Relative Motion
Solution
The resultant of two forces P and Q is least when the angle between them is
A
0°
B
45°
C
60°
D
90°
E
180°
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
The two forces will have minimum resultant if both are acting in opposite directions (that is at an angle of 180 ^\circ between them).
Source: Myschool Past Questions Archive (Record #42991)
Physics
NECO SSCE 2004
Reflection, Refraction & Dispersion of Light
A ray of light experiences a minimum deviation when passing through an equilateral triangular glass prism. Calculate the angle of incidence of the ray. [Refractive index of glass = 1.5]
A
300.0°
B
48.6°
C
60.0°
D
75.5°
E
105.0 °
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 #42992)
Physics
NECO SSCE 2004
Magnetism, Electromagnetism & AC Circuits
Calculate the energy stored in an inductor of inductance 0.5H when a current of 3A flows through it.
A
15.00 J
B
9.45 J
C
6.00 J
D
4.50J
E
2.25 J
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 #42993)
Physics
NECO SSCE 2004
Equilibrium of Forces, Moments & Flotation
The relative density of dilute tetraoxosulphate (vi) acid in a battery is measured with a
A
barometer
B
hydrometer
C
manometer
D
hypsometer
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 #42994)
Physics
NECO SSCE 2004
Current Electricity & Electric Circuits
Solution
A resistor connected in parallel with a galvanometer so that a large amount of current can be measured is called a/an
A
ammeter
B
avometer
C
coil resistor
D
multiplier
E
shunt.
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
A galvanometer can be converted into ammeter by connecting a low resistance called shunt in parallel to the galvanometer.
Source: Myschool Past Questions Archive (Record #42995)
Physics
NECO SSCE 2004
Current Electricity & Electric Circuits
Solution
A resistor connected in parallel with a galvanometer so that a large amount of current can be measured is called a/an
A
ammeter
B
avometer
C
coil resistor
D
multiplier
E
shunt.
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
A galvanometer can be converted into ammeter by connecting a low resistance called shunt in parallel to the galvanometer.
Source: Official Exam / Past Question Archive
Physics
WAEC / WASSCE 2004
Linear Motion, Projectiles & Kinematics
Solution
In his first attempt, a long jumper took off from the spring board with a speed of 8 ms\(^{-1}\) at 30^\circ to the horizontal. He makes a second attempt with the same speed at 45^\circ to the horizontal. Given that the expression for the horizontal range of a projectile is \(\frac{u^2 sin 2\theta}{g}\) where all the symbols have their usual meanings, show that he gains a distance of 0.8576 m in his second attempt. [g = 10ms\(^{-2}\)]
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
1st Attempt R = \(\frac{U^2 sin 2 \theta}{g} = \frac{8^2 sin 60}{10} = 5.5424m\)
2nd Attempt R = \(U^2sin 2 \theta\)
= \(\frac{8^2sin 90}{10}\) = 6.4m
Gain = 6.4 - 5.5425 = 0.8576m
Source: Myschool Past Questions Archive (Record #53948)
Physics
WAEC / WASSCE 2004
Current Electricity & Electric Circuits
The diagram above illustrates the path ABC, in a vertical x z plane, of a bullet shot into the air at an angle above the horizontal. Copy the diagram, and, using arrows, indicate the relative magnitudes and directions of the vertical and horizontal components of the velocities of the bullet at the point A, B and C.
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option .
Source: Myschool Past Questions Archive (Record #53949)
Physics
WAEC / WASSCE 2004
Current Electricity & Electric Circuits
Solution
(a) For a water voltameter, identify the;
(i) electrolyte;
(ii) electrodes;
(iii) substances deposited on the electrodes
(b)State the ratio of the volume of the substances deposited in (a) (iii) above
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
(a) (i) Electrolyte = dilute tetraoxosulphate (vi) acid
(ii) Electrode = platinum
(iii) Hydrogen and oxygen are deposited at the cathode and anode respectively.
(b) Volume of hydrogen is twice that of oxygen.
Source: Myschool Past Questions Archive (Record #53950)
Physics
WAEC / WASSCE 2004
Reflection, Refraction & Dispersion of Light
Solution
A parallel beam of unpolarised light is incident on a plane glass surface at an angle of 58\(^{o}\) to the normal. If the reflected beam is completely polarised, calculate the refractive index of the glass.
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
When i = 58^\circ, r = 90' - 58^\circ = 32^\circ
n = \(\frac{sin i}{sin r}\) = \(\frac{sin 58^o}{sin 32^o}\)
= 1.60
Source: Myschool Past Questions Archive (Record #53951)
Physics
WAEC / WASSCE 2004
Reflection, Refraction & Dispersion of Light
Solution
State three methods of polarising an unpolarised light
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
Unpolarised light can be polarised.
(i) By reflection
(ii) By double refraction
(iii) Polarising pile of plates
(iv). Selective absorption by crystals.
(v) Passing unpolarised light through a amid.
Source: Myschool Past Questions Archive (Record #53952)
Physics
WAEC / WASSCE 2004
Current Electricity & Electric Circuits
Solution
(a) Define diffusion
(b) State Graham's law of diffusion
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
(a) Diffusion is the process by which substances mix with one another due to the random motion of their molecules.
(b) Graham's law of diffusion states that the rate of diffusion of gases is inversely proportional to the square - root of their densities provided temperature remains constant.
Source: Myschool Past Questions Archive (Record #53953)
Physics
WAEC / WASSCE 2004
Elasticity, Density, Pressure & Fluids
Solution
A Spiral spring of natural length 20.00cm has a scale hanging freely in its lower end. When an object ass 40 g is placed in the pan. its length becomes cm. When the object is replaced with another of 60g, the length becomes 22.05cm. Calculate the mass scale pan. [g = 10 ms\(^{-2}\)]
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
Mg = Ke ; (m + 40)g = 1.80k .................. (i)
(m + 60)g = 2.05K ................ (ii)
\(\frac{m + 40}{m + 60} = \frac{1.80}{2.05}\)
1.80 (m + 60) = 2.05 (m + 40)
m = \(\frac{26}{0.25} = 104g\)
Source: Myschool Past Questions Archive (Record #53954)
Physics
WAEC / WASSCE 2004
Elasticity, Density, Pressure & Fluids
Solution
(a) Define Young's modulus
(b) When a force of 50 N is applied to the free end of an elastic cord, an extension of 4 cm is produced in the cord. Calculate the work done on the cord.
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
(a) Young's modulus is the ratio of tensile or compressive stress to tensile or compressive strain.
(b) W = \(\frac{1}{2}\)K = \(\frac{1}{T}\) x 50 x 0.04 = 1.0J
Source: Myschool Past Questions Archive (Record #53955)
Physics
WAEC / WASSCE 2004
Atomic, Quantum, Nuclear Physics & Electronics
Solution
(a) List two properties of cathode rays
(b) Explain how the intensity and energy of cathode rays may be increased
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
(a) Properties of cathode rays: They are;
(i) Negatively charged
(ii) Possess energy
(iii) Possess momentum
(iv) Travel in straight lines in field free space.
(v) Are deflected by electric and magnetic fields.
(b) (i) The intensity of cathode rays can be increased by increasing the temperature of the cathode.
(ii) The energy of cathode ray cen be increased by increasing the P.d between the anode and the cathode.
Source: Myschool Past Questions Archive (Record #53956)