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Physics
WAEC / WASSCE 2008
Mechanics and Properties of Matter
Solution
If the air inside a rigid box is heated, the i, average speed of the molecules increases ii. pressure of the air increases iii. average separation of the molecule increases. Which of the statements above are correct?
A
i and ii only
B
ii and iii only
C
i and iii only
D
i, ii and iii
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
When air in a rigid box is heated, the molecules move faster, causing more forceful collisions with the walls and hence increasing the pressure. Since the box cannot expand, the average separation remains unchanged.
Source: Myschool Past Questions Archive (Record #34958)
Physics
WAEC / WASSCE 2008
Mechanics and Properties of Matter
which of the following statements about Archimedes' principle is correct? The upthrust on a body is a measure of the
A
mass of fluid displaced
B
weight of the body
C
volume of the body
D
weight of the fluid displaced
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 #34962)
Physics
WAEC / WASSCE 2008
Mechanics and Properties of Matter
Solution
A car travelling with a uniform velocity of 30ms-1 along a horizontal road overcomes a constant frictional force of 600N. Calculate the power of the engine of the car
A
18kW
B
20kW
C
180kW
D
200kW
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
P = FV
= 600 x 30 = 18kW
Source: Myschool Past Questions Archive (Record #34966)
Physics
WAEC / WASSCE 2008
Mechanics and Properties of Matter
Which of the following devices convert heat energy to electrical energy?
A
transformer
B
dynamo
C
thermocouple
D
thermostat
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 #35028)
Physics
WAEC / WASSCE 2008
Mechanics and Properties of Matter
Solution
An object of mass 0.25kg moves at a height h above the ground with a speed of 4ms-1, if its mechanical energy at this height is 12 J, determine the value of h. [g = 10ms-1]
A
0.8m
B
4.0m
C
4.8m
D
5.6m
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
The total mechanical energy E at height h is given by: E = PE + KE
E = mgh + \(\frac{1}{2}\)mv\(^2\)
12 = (0.25 x 10 x h) + (0.5 x 0.25 x 4 x 4)
12 = 2.5h + 2
2.5h = 12 - 2 = 10
h = \(\frac{10}{2.5}\) = 4m.
Source: Myschool Past Questions Archive (Record #35031)
Physics
WAEC / WASSCE 2008
Mechanics and Properties of Matter
Solution
Which of the following equations for the efficiency of a machine is correct?
A
Efficiency = \(\frac{\text{Velocity Ratio}}{\text{Mechanical Advantage}}\) x 100%
B
Efficiency = \(\frac{input}{output}\) x 100%
C
Efficiency = \(\frac{\text{load distance}}{\text{effort distance}}\) x 100%
D
Efficiency = \(\frac{\text{Mechanical Advantage}}{\text{Velocity Ratio}}\) x 100%
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
EFFICIENCY is the ratio of useful work done by the machine to the total work put into the machine.
Source: Myschool Past Questions Archive (Record #35033)
Physics
WAEC / WASSCE 2008
Mechanics and Properties of Matter
Diagram
The diagram above represents the displacement-time graph of the motion of an object thrown upwards. The velocity of the object at the point P is
Attached Figure / Diagram
A
maximum
B
uniform
C
zero
D
terminal
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 #34983)
Physics
WAEC / WASSCE 2008
Mechanics and Properties of Matter
The mass attached to a string is moving in a circular path. If the speed is doubled, the tension in the string will be
A
doubled
B
halved
C
four times as great
D
one-fourth as much
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 #35015)
Physics
WAEC / WASSCE 2008
Mechanics and Properties of Matter
Solution
An object of mass 2kg moving with a velocity 3ms-11 collides head-on with another object of mass 1kg moving in the opposite direction with a velocity of 4ms-1. If the objects stick together after collision, calculate their common speed.
A
0.60ms-1
B
0.67ms-1
C
2.00ms-1
D
3.33-1
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(M_1V_1 - (M_2V_2) = V(M_1 + M_2)\)
2 x 3 - 1 x 4 = V(2 + 1)
V = \(\frac{2}{3}\)
= 0.67ms-1
Source: Myschool Past Questions Archive (Record #35017)
Physics
WAEC / WASSCE 2008
Mechanics and Properties of Matter
Solution
A rectangular block of dimensions 2.0m x 1.0m x 0.5m weighs 200N. calculate the maximum pressure exerted by the block on a horizontal floor.
A
100Nm-2
B
200Nm-2
C
300Nm-2
D
400Nm-2
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
P = \(\frac{wt}{A} = \frac{200}{0.5 \times 1} = 400Nm^{-2}\)
This is because Area is inversely proportional to pressure, so an increase in pressure leads to a decrease in area and vice versa.
Source: Myschool Past Questions Archive (Record #34968)
Physics
WAEC / WASSCE 2008
Mechanics and Properties of Matter
Solution
The cubic expansivity of a certain gas at constant pressure is \(\frac{1}{273} k^{-1}\). If a given mass of the gas is held at constant pressure and its volume at 0oC is 273m3, determine the volume of the gas at 273oC.
A
273m3
B
546m3
C
8193
D
10923
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(V_2 = V_1(B\theta + 1) = 273 (\frac{1}{373} \times 273 + 1)\)
= 546m3
Source: Myschool Past Questions Archive (Record #35046)
Physics
WAEC / WASSCE 2008
Mechanics and Properties of Matter
The working principle of a pressure cooker is based on the
A
increase in the volume of steam inside it
B
complete trapping of heat inside it
C
increase in the pressure of the pot
D
decrease in the pressure of the pot
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 #35050)
Physics
WAEC / WASSCE 2008
Mechanics and Properties of Matter
Solution
A direct current of 5A flow through a 0.2H inductor. Calculate the energy stored in the inductor
A
0.5J
B
1.0J
C
2.5J
D
5.0J
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
P = \(\frac{1}{2} I^2 L\)
= 5\(^2 \times\) 0.2 \(\times\) \(\frac{1}{2}\)
= 2.5J
Source: Myschool Past Questions Archive (Record #35107)
Physics
WAEC / WASSCE 2008
Mechanics and Properties of Matter
Solution
Nuclear fission is preffered to nuclear fusion in the generation of energy because
A
very high temperature are required for fusion
B
the raw materials for fusion are easily obtained
C
energy obtained from fusion is relatively small
D
the by-products of fusion is very dangerous
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Elevated temperatures are necessary to initiate fusion but not fission reactions because, In a fission reaction, the positively charged nucleus and neutrally charged neutrons clash to start the fission process. The procedure can be carried out at lower temperatures since it has a low activation barrier.
NOTE: fusion creates less radioactive material than fission.
Source: Myschool Past Questions Archive (Record #35111)
Physics
WAEC / WASSCE 2008
Mechanics and Properties of Matter
Diagram
The diagram above shoes three forces F1, F2 and F3, which of the following ewuations is correct?
Attached Figure / Diagram
A
F3 = F1 + F2
B
F2 = F1 + F3
C
F1 = F2 - F3
D
F1 = F2 + F3
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 #35316)