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Physics
WAEC / WASSCE 1999
Mechanics and Properties of Matter
Solution
If the force of attraction between the sun and the 1 planets is removed; the planets will
A
fall towards the sun
B
scatter and stop moving
C
continue to move at tangent to their original orbits
D
continue to move perpendicular to their original orbits. '
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
According to Newton's First Law, an object moves in a straight line unless a force acts on it. The Sun's gravity provides the centripetal force that keeps planets orbiting. If this force disappears, the planet will leave its orbit and move in a straight line tangent to that point.
Source: Myschool Past Questions Archive (Record #25474)
Physics
WAEC / WASSCE 1999
Mechanics and Properties of Matter
Diagram
A 15kg mass, suspended from a ceiling, is pulled aside with a horizontal force, F, as shown in the diagram above. Calculate the value of the tension, T. (g = 10ms-2)
Attached Figure / Diagram
A
300.0N
B
173.2N
C
30.0N
D
17.3N
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 #25475)
Physics
WAEC / WASSCE 1999
Mechanics and Properties of Matter
A trolley of mass 4kg moving on a smooth horizontal platform with a speed of 1.0ms-1 collides perfectly with a stationary trolley of the same mass on the same platform. Calculate the total momentum of the two trolleys immediately after the collision.
A
0.5Ns
B
1.0Ns
C
4.0Ns
D
8.0Ns
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 #25477)
Physics
WAEC / WASSCE 1999
Mechanics and Properties of Matter
Calculate the heat energy required to change 0.1kg of ice at 0oC to water boiling at 100oC. (Specific heat capacity of water = 4200 J kg-1K-1) (Specific latent heat of fusion of ice = 336,000 J kg-1)
A
75,600J
B
336,000J
C
340,200J
D
378,000J.
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 #25484)
Physics
WAEC / WASSCE 1999
Mechanics and Properties of Matter
Calculate the power rating of an immersion heater used for 10 minutes to increase the temperature of 10kg of water by 15K. (Specific heat capacity of water = 4200 J l-1K-1)
A
1,050W
B
16,800W
C
18,060W
D
20,160W
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 #25486)
Physics
WAEC / WASSCE 1999
Mechanics and Properties of Matter
Magnetic flux density is defined as the
A
total number of magnetic lines of force surrounding a magnet
B
number of magnetic lines of force per unit area normal to the magnetic field
C
strength of the magnetic field surrounding a current-carrying conductor
D
magnetic force exerted on a unit magnetic pole
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 #25501)
Physics
WAEC / WASSCE 1999
Mechanics and Properties of Matter
In a uniform electric field, the magnitude of the force on a charge of 0.2 C is 4N. Calculate the electric field intensity
A
20 N C-1
B
8 N C-1
C
5 N C-1
D
2 N C-1
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 #25503)
Physics
WAEC / WASSCE 1999
Mechanics and Properties of Matter
A point charge of magnitude 2μC is moved through a distance of 0.02 m against uniform field of intensity 25 Vm-1 Calculate the work done on the charge
A
5.0 x 106J
B
1.0 x10-6J
C
5.0 x10-7J
D
1.0 x 10-2J
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 #25506)
Physics
WAEC / WASSCE 1999
Mechanics and Properties of Matter
Diagram
Solution
The diagram above illustrates the energy transitions of five electrons of an atom. Which of the transitions will produce the emission of longest wavelength?
Attached Figure / Diagram
A
I
B
II
C
III
D
IV
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\lambda = \(\frac{\text{hc}}{\text{E}}\)
Since E is negative for bound states (like electrons in atoms), the less negative the value of energy, the longer the wavelength
Source: Myschool Past Questions Archive (Record #25508)
Physics
WAEC / WASSCE 1999
Mechanics and Properties of Matter
Diagram
Solution
Which of the transitions will produce the emission of highest frequency?
Attached Figure / Diagram
A
V
B
IV
C
III
D
II
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The one with the most energy produces the highest frequency
\DeltaE for V = 0.0 - (-12.0) = 0.0 + 12.0 = 12.0 eV (which is the most energetic)
Source: Myschool Past Questions Archive (Record #25509)
Physics
WAEC / WASSCE 1999
Mechanics and Properties of Matter
A metal has work function of 4.375 eV Calculate its threshold frequency. (h = 6.6 x 10-34Js; 1eV = 1.6 x 10-19J)
A
2.01 X 1015Hz
B
1.06x1015Hz
C
6.30 x 1014Hz
D
1.60 x 1014Hz
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 #25511)
Physics
WAEC / WASSCE 1999
Mechanics and Properties of Matter
Solution
(a) What is surface tension?
(b) State two methods by which the surface tension of a liquid can be reduced.
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
(a) Surface tension is the force per unit length acting at right angle to one of a line drawn in the surface.
(b) By adding detergents, soap or oil. By heating the liquid.
Source: Myschool Past Questions Archive (Record #54660)
Physics
WAEC / WASSCE 1999
Mechanics and Properties of Matter
Solution
(a) What is the principle upon which the lighting in fluorescent tubes operate?
(b) State two factors on which the colour of light from a fluorescent tube depends.
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
(a) Electrical discharge through low pressure gas
(b)
- Nature of the gas in the tube
- Nature of the coating d inside the tube.
Source: Myschool Past Questions Archive (Record #54662)
Physics
WAEC / WASSCE 1999
Mechanics and Properties of Matter
Solution
(a) State Hooke's law of elasticity
(b) A spiral spring, loaded with a piece of metal, extends by 10.5cm hair. When the metal is fully submerged in water, the spring extends by 6.8cm. Calculate the relative density of the metal. (Assume Hooke's law is obeyed).
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
(a) Hooke's law states that the force applied on an elastic materal is proportional to its extension, provided the elastic limit is not exceeded
(b) R.D = \(\frac{\text{weight in air}}{\text{upthrust}} = \frac{10}{10.5 - 6.8} = \frac{10.5}{3.7} = 2.84\)
Source: Myschool Past Questions Archive (Record #54665)
Physics
WAEC / WASSCE 1999
Mechanics and Properties of Matter
Solution
(a) State Heisenberg's uncertainty principle.
(b) Mention two phenomena that can only be explained in terms of the particulate nature of light.
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
(a) Heinsenberg's uncertainty principle states that it is impossible to determine simultaneously the exact position and exact momentum of a particle
(b) Black body radiation - Photo electricity.
Source: Myschool Past Questions Archive (Record #54669)