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Physics
WAEC / WASSCE 2002
Mechanics and Properties of Matter
A man was moving round a circular path continuously for 4 minutes and covered the following distances in the times stated :
Distance (in metres) 200, 400, 600, 300
Time(in minutes) : 1, 2, 3, 4 respectively. Which of the following statements is correct about the motion of the man?
A
the man was moving without uniform velocity
B
the speed was changing constantly
C
the velocity was uniform
D
it was an instance of motion in which both speed and velocity are the same
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 #33970)
Physics
WAEC / WASSCE 2002
Mechanics and Properties of Matter
Solution
A car takes off from rest and covers a distance of 80m on a straight road in 10s. Calculate the magnitude of its acceleration
A
1.25ms-2
B
1.60ms-2
C
4.00ms-2
D
8.00ms-2
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
s = \(ut + \frac{1}{2}at^2\)
80 = 0 x 10 + \(\frac{1}{2}\) x a x 102
a = \(\frac{80}{50} = 1.6ms^2\)
Source: Myschool Past Questions Archive (Record #33974)
Physics
WAEC / WASSCE 2002
Mechanics and Properties of Matter
Solution
An object is acted upon by a system of parallel forces causing the object to be in static equilibrium. Which of the following statements is not correct?
A
The resultant of the parallel force is zero
B
the algebraic sum of the moment of the forces is zero
C
all the parallel forces must be equal in magnitude and in direction
D
the sum of the forces in one direction must be equal to the sum of forces in the opposite direction
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
The conditions of a body in equilibrium by action of parallel forces are ;
i) total upward forces are equal to total downward forces, ii) The algebraic sum of the moment of all forces about any point should be zero, and iii) The total resultant force must be zero. So OPTION C is not correct about parallel forces causing an object to be in static equilibrium.
Source: Myschool Past Questions Archive (Record #33983)
Physics
WAEC / WASSCE 2002
Mechanics and Properties of Matter
Solution
A spiral spring of natural length 30.0cm and force constant of 20Nm-1 is compressed to 20.0cm. Calculate the energy stored in the spring
A
0.1J
B
1.0J
C
10.0J
D
100.0J
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Energy = \(\frac{1}{2} ke^2 = \frac{1}{2} \times 20 \times 0.1^2\)
= 0.1J
Source: Myschool Past Questions Archive (Record #34007)
Physics
WAEC / WASSCE 2002
Mechanics and Properties of Matter
Solution
Which of the following statements correctly defines quantitatively the work done by a force? the product of the force and the distance moved
A
parallel to the line of action of the force from a reference point
B
perpendicular to the line of action of the force from a reference point
C
on a line through the reference point
D
by the object
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The quantity of work done (or energy converted) by a force, when the force moves, depends on two obvious factors:
- the distance moved (in the direction along which the force acts) and
- the magnitude (strength) of the force
Source: Myschool Past Questions Archive (Record #34009)
Physics
WAEC / WASSCE 2002
Mechanics and Properties of Matter
Solution
a load of mass120kg is raised vertically through a height of 2m in 30s by a machine whose efficiency is 100%. Calculate the power generated by the machine. [g = 10ms-2]
A
60W
B
80W
C
100W
D
120W
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
p = \(\frac{mgh}{t} = \frac{120 \times 10 \times 2}{30} = 80W\)
Source: Myschool Past Questions Archive (Record #34016)
Physics
WAEC / WASSCE 2002
Mechanics and Properties of Matter
Solution
Calculate the energy required to vapourise 50g of water initially at 80oC.[specific heat capacity of water = 4.2Jg-1K-1][specific latent heat of vaporisation of water = 2260Jg-1]
A
113,000J
B
117,200J
C
234,400J
D
420,000J
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
mc\(\theta\) + ML = 50 x 4.2 x 20 + 50 x 2260
= 117,200J
Source: Myschool Past Questions Archive (Record #34072)
Physics
WAEC / WASSCE 2002
Mechanics and Properties of Matter
Solution
A radio wave has a wavelength of 150m. If the velocity of radio waves is free spaces is 3 x 10\(^8\) ms\(^{-1}\), calculate the frequency of the radio wave
A
4.50 x 1010Hz
B
5.0 x 109Hz
C
4.5 x 109Hz
D
2.0 x 106Hz
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
f = \(\frac{V}{\lambda} = \frac{3 \times 10^8}{150}\)
= 2.0 x 10\(^6\) Hz
Source: Myschool Past Questions Archive (Record #34078)
Physics
WAEC / WASSCE 2002
Mechanics and Properties of Matter
Solution
Two spheres of masses 100kg and 90kg respectively have their centres separated by a distance of 1.0m. Calculate the magnitude of the force of attraction between them. [G = 6.70 x 10-11Nm-2kg-2]
A
6.70 x 10-11N
B
6.70 x 10-10N
C
6.03 x 10-11N
D
6.03 x 10-7N
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
F = \(\frac{Gm_1m_2}{r^2} = 6.7 \times 10^{11} \times \frac{100 \times 90}{1^2} = 6.03 \times 10^{-7}N\)
Source: Myschool Past Questions Archive (Record #34098)
Physics
UTME / JAMB 2002
Mechanics and Properties of Matter
If the total force acting on a particle is zero, the linear momentum will
A
Increase
B
Decrease
C
Be Constant
D
Increase then decrease
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 #41480)
Physics
NECO SSCE 2002
Mechanics and Properties of Matter
Solution
An electric heater takes 4A when operated on a 250V supply. What is the cost of the electricity consumed at 10k per kWh when the heater is used for 5 hours?
A
10k
B
50k
C
N1.00
D
N5.00
E
N10.00
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Electrical power = current x voltage = IV
but I = 4A and V = 250v
P = 4 x 250 = 1000W → 1KW
Electricity consumed = Power x time
= 1 x 5 = 5kwh
but 1kwh = 10k ( given )
cost of electricity consumed for 5hrs = 5 x 10 = 50k.
Source: Myschool Past Questions Archive (Record #42860)
Physics
NECO SSCE 2002
Mechanics and Properties of Matter
The energy stored in a capacitor of capacitance 5 μF is 40J. What is the voltage applied across its terminals?
A
4V
B
8V
C
16V
D
200V
E
4000V
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 #42863)
Physics
NECO SSCE 2002
Mechanics and Properties of Matter
A body of mass 4 kg is accelerated from rest by a steady force of 9N. What is its speed when it has travelled a distance of 8m?
A
6 ms-1
B
18 ms-1
C
32 ms-1
D
36 ms-1
E
48 ms-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 #42867)
Physics
NECO SSCE 2002
Mechanics and Properties of Matter
A block of ice of mass 10kg at 0°C absorbs heat energy from its surroundings and changes to water at the same temperature. The heat absorbed is referred to as
A
heat capacity
B
latent heat
C
specific heat
D
specific heat capacity
E
specific latent heat.
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 #42872)
Physics
NECO SSCE 2002
Mechanics and Properties of Matter
Solution
A body executing a simple harmonic motion has an angular velocity of 22 radians per second. If it has a maximum displacement of 10cm, what is its linear velocity?
A
1100ms-1
B
440 ms-1
C
220 ms-1
D
22 ms-1
E
2.2ms-1
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
Amplitude[r] =10cm =0.1m.
Angular velocity[w] =22 radians per second
Linear velocity=wr
V=22\times0.1
V=2.2m/s
Source: Myschool Past Questions Archive (Record #42873)