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Physics
WAEC / WASSCE 2014
Mechanics and Properties of Matter
When the linear momentum of a body is constant, the net force acting on it
A
is zero
B
increases
C
decreases
D
remains constant
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 #35740)
Physics
WAEC / WASSCE 2014
Mechanics and Properties of Matter
If no net force acts on an object, the object maintains a state of rest or constant speed in a straight line. The above is a statement of Newton's
A
first law of motion
B
second law of motion
C
third law of motion
D
law of universal gravitation
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 #35741)
Physics
WAEC / WASSCE 2014
Mechanics and Properties of Matter
Solution
A car starts from rest and covers a distance of 40m in 10s. Calculate the magnitude of its acceleration
A
0.25ms-2
B
0.80ms-2
C
3.20ms-2
D
4.00ms-2
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
S = ut + \(\frac{1}{2} at^2\)
40 = 0 x 10 + \(\frac{1}{2}\) x a x 102
50a = 40
a = \(\frac{40}{50}\)
= 0.8ms-2
Source: Myschool Past Questions Archive (Record #35745)
Physics
WAEC / WASSCE 2014
Mechanics and Properties of Matter
A screw-jack has the distance between its successive threads as P and the length of its tommy bar as r. Its velocity ratio is given by the expression
A
\(\frac{2 \pi r^2}{P}\)
B
\(\frac{2 \pi r}{P}\)
C
\(\frac{2 \pi}{rp}\)
D
\(\frac{P}{2 \pi r}\)
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 #35751)
Physics
WAEC / WASSCE 2014
Mechanics and Properties of Matter
Solution
Heat transfer by conduction is similar to wave motion because
A
there is increase in temperature
B
transfer of materials is involved
C
charged particles vibrates at right angles
D
no transfer of materials is involved
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Heat transfer by conduction is similar to wave motion because no transfer of materials is involved. In conduction, heat is transferred from molecule to molecule within a substance without moving the substance as a whole. This is similar to wave motion where energy is transferred from particle to particle within the medium without any net movement of the medium itself.
Source: Myschool Past Questions Archive (Record #35752)
Physics
WAEC / WASSCE 2014
Mechanics and Properties of Matter
Solution
Alcohol of mass 21g and density 0.7g cm-3 is mixed with 10g of water. Determine the density of the mixture [density of water = 1.0gcm-3]
A
0.775gcm-3
B
0.875gcm-3
C
0.780gcm-3
D
0.880gcm-3
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(V_A = \frac{M}{D} = \frac{21}{0.7} = 30cm^3\)
\(V_w = \frac{M}{D} = \frac{10}{1} = 10cm^3\)
Vmixture = 30 + 10 = 40cm3
Mmixture = 21 + 10 = 31g
Dmixture = \(\frac{m}{v} = \frac{31}{40} = 0.775\)
Source: Myschool Past Questions Archive (Record #35748)
Physics
WAEC / WASSCE 2014
Mechanics and Properties of Matter
A device that converts mechanical energy into electrical energy is
A
a dynamo
B
an electric motor
C
an induction coil
D
a transformer
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 #35749)
Physics
WAEC / WASSCE 2014
Mechanics and Properties of Matter
The S.I unit of power is
A
N
B
Pa
C
W
D
J
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 #35750)
Physics
WAEC / WASSCE 2014
Mechanics and Properties of Matter
Solution
A car traveling at 30ms\(^{-1}\) overcomes a frictional resistance of 100N while moving. Calculate the power developed by the engine. [1 hp = 0.75 kW]
A
0.23hp
B
0.40hp
C
4.00hp
D
4.40hp
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
P = FV = \(\frac{100 \times 30}{1000} = 3 kW\)
\(\frac{3}{0.75} = 4hp\)
Source: Myschool Past Questions Archive (Record #35759)
Physics
WAEC / WASSCE 2014
Mechanics and Properties of Matter
The region around a magnet in which magnetic force can be expressed is known as
A
declination
B
flux density
C
field
D
flux
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 #35770)
Physics
WAEC / WASSCE 2014
Mechanics and Properties of Matter
The energy stored in a simple cell is
A
electrical
B
nuclear
C
thermal
D
chemical
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 #35772)
Physics
WAEC / WASSCE 2014
Mechanics and Properties of Matter
The energy required to separate the nucleus in an atom completely is known as
A
mass defect of the atom
B
electron binding energy
C
excitation energy
D
nuclear binding energy
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 #35781)
Physics
WAEC / WASSCE 2014
Mechanics and Properties of Matter
Solution
Two identical charges situated 20cm apart in vacuum repel each other with a force of 1.0N.Calculate the value of each other with a force of 1.0N. Calculate the value of each charge. [(14 \(\pi \varepsilon_o)^{-1}\) = 9 x 109Nm2C-2]
A
21\(\mu C\)
B
3.6\(\mu C\)
C
4.0\(\mu C\)
D
4.4\(\mu C\)
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
F = \(\frac{Q^2}{4 \pi \varepsilon_o r^2}\)
I = 9 x 109 x \(\frac{Q^2}{0.2^2}\)
Q = \(\sqrt{\frac{0.04}{9 \times 10^9}}\)
= 2.11 x 10-6
Source: Myschool Past Questions Archive (Record #35776)
Physics
WAEC / WASSCE 2014
Mechanics and Properties of Matter
Solution
A tennis ball projected at an angle 0 attains a range R = 78. If the velocity imparted to the ball by the racket is 30 ms\(^{-1}\), calculate O. [ g = 10 ms\(^{-2}\)]
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
R = \(\frac{U^2 sin 2\theta}{g}\), 78 = \(\frac{30^2 sin 2\theta}{10}\)
\(sin2\theta = \frac{780}{900}\) = 0.8667, \(2\theta = sin^{-1}0.8667 = 60^o\)
\(\theta \frac{60^o}{2} = 30^o\)
Source: Myschool Past Questions Archive (Record #53062)
Physics
WAEC / WASSCE 2014
Mechanics and Properties of Matter
Solution
A metallic bar 50 cm long has a uniform cross-sectional area of 4.0 cm\(^2\). If a tensile force of 35 kN produces an extension of 0.25 mm, calculate the value of Young's modulus
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
E \(\frac{Fl}{Ae}\)
= \(\frac{35 \times 10^3 \times 50 \times 10^{-2}}{4 \times 10^{-4} \times 0.25 \times 10 ^{-3}}\)
= 1.75 x 10\(^{11}\)Nm\(^{-2}\)
Source: Myschool Past Questions Archive (Record #53065)