Question Library
Browse, filter, and study verified past examination questions with step-by-step mathematical reasoning.
Searching 18,000+ Questions...
Sifting topics, KaTeX formulas & verified solutions
Showing 1801–1815 of 5315 verified questions
Sort by:
Physics
WAEC / WASSCE 2012
Thermal Physics
Which of the following substances is the most volatile at room temperature?
A
water
B
diesel
C
petrol
D
kerosine
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 #35528)
Physics
WAEC / WASSCE 2012
Heat Energy & Temperature
Solution
A bird flies at 10ms\(^{-1}\) for 3s, 15ms\(^{-1}\) for 3s and 20 ms\(^{-1}\) for 4s. Calculate the bird's average speed
A
4.5 ms-1
B
15.0 ms-1
C
15.5 ms-1
D
51.7 ms-1
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Av. speed = \(\frac{3 \times 15 + 3 \times 10 + 4 \times 20}{3 + 3 + 4}\)
= 15.5 ms\(^{-1}\)
Source: Myschool Past Questions Archive (Record #35529)
Physics
WAEC / WASSCE 2012
Waves and Optics
The time of flight for a projectile motion is given by the expression
A
\(\frac{U sin \theta}{g}\)
B
\(\frac{U sin \theta}{2g}\)
C
\(\frac{2U sin \theta}{g}\)
D
\(\frac{U sin 2\theta}{g}\)
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 #35530)
Physics
WAEC / WASSCE 2012
Electricity and Magnetism
Solution
An object is dropped from the top of a tower. If it takes 4s for it to reach the ground, calculate the height of the tower.(g = 10 ms-2, ignore air resistance)
A
20m
B
40m
C
80m
D
160m
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
H = \(\frac{1}{2} gt^2\)
\(\frac{1}{2} \times 10 \times 4^2 = 80\)
Source: Myschool Past Questions Archive (Record #35534)
Physics
WAEC / WASSCE 2012
Mechanics and Properties of Matter
When a body is slightly tilted, it is found that its centre of gravity is slightly raised. What is the state of equilibrium of the body?
A
unstable
B
stable
C
neutral
D
cannot be determined
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 #35536)
Physics
WAEC / WASSCE 2012
Heat Energy & Temperature
Solution
A simple pendulum makes 50 oscillations in one minute. Determine its period of oscillation
A
0.02s
B
0.83s
C
1.20s
D
50.00s
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
T = \(\frac{t}{n} = \frac{60}{50} = 1.2\)
Source: Myschool Past Questions Archive (Record #35555)
Physics
WAEC / WASSCE 2012
Mechanics and Properties of Matter
The tendency for a stationary body to continue to remain at rest when a force is applied to it is known as
A
friction
B
impulse
C
inertia
D
momentum
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 #35556)
Physics
WAEC / WASSCE 2012
Mechanics and Properties of Matter
Solution
A resultant force of magnitude 15N acts on a body of mass 250g. Calculate the magnitude of the acceleration
A
0.06 ms-2
B
3.75ms-2
C
16.67ms-2
D
60.00ms-2
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
a = \(\frac{F}{M} = \frac{15}{0.25} = 60\)
Source: Myschool Past Questions Archive (Record #35557)
Physics
WAEC / WASSCE 2012
Heat Energy & Temperature
A girl stands on a scale in a lift. If the reading on the scale is less than her weight, then the lift is moving
A
upward at uniform speed
B
upward with uniform acceleration
C
downward with uniform speed
D
downward with uniform acceleration
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 #35559)
Physics
WAEC / WASSCE 2012
Mechanics and Properties of Matter
Solution
The S.I unit of heat is
A
joule
B
kelvin
C
watt
D
ampere
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Heat is a form of energy (heat energy). The S.I unit of energy generally is Joules (J).
Source: Myschool Past Questions Archive (Record #35560)
Physics
WAEC / WASSCE 2012
Mechanics and Properties of Matter
Solution
A body is pulled through a distance of 500m by a force of 20N. If the power developed is 0.4kW, calculate the time for which the force acts
A
250.0s
B
25.0s
C
2.5s
D
0.5s
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Force x Distance = Power x Time
Time = \(\frac{Force \times Distance}{Power}\)
= \(\frac{20 \times 500}{0.4 \times 1000}\)
= 25.0s
Source: Myschool Past Questions Archive (Record #35562)
Physics
WAEC / WASSCE 2012
Mechanics and Properties of Matter
Solution
The derived unit of pressure can be expressed as
A
kgms-2
B
kg m-1s-2
C
kg m-2s-2
D
kg m-1s2
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Pressure = \(\frac{Force}{Area}\)
Force = mass x acceleration
\(\therefore\) Pressure = \(\frac{mass \times acceleration}{Area}\)
= \(\frac{kg \times m \times s^{-2}}{m^2}\)
= kg m\(^{-1}\) s\(^{-2}\)
Source: Myschool Past Questions Archive (Record #35515)
Physics
WAEC / WASSCE 2012
Thermal Physics
Diagram
The diagram above illustrates trapped air in a syringe placed in water that is gradually heated. It is observed that the piston rises as the temperature of the water rises. Which of the following statements explains this observation?
Attached Figure / Diagram
A
frequency of collision of trapped air molecules with walls of the syringe is more
B
molecules of trapped air expands more
C
speed of the trapped air molecules decreases
D
number of molecules of trapped air increases
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 #35518)
Physics
WAEC / WASSCE 2012
Thermal Physics
Solution
A metal sheet of area 100cm\(^2\) was heated through 70^\circC. Calculate its new area if the linear expansivity of the metal is 0.000017K\(^{-1}\).
A
100.06 cm2
B
100.12cm2
C
100.24cm2
D
100.36cm2
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Formula: A\(_2\) = A\(_1\)(1 + \(\beta \theta\))
where \(\beta\) = The area expansivity
\(\theta\) = Change in temperature.
\(\beta\) = 2\(\alpha\)
where \(\alpha\) = linear expansivity of the body.
⇒ \(\beta\) = 2 x 0.000017
= 0.000034 K\(^{-1}\)
\(\therefore\) A\(_2\) = 100 (1 + (0.000034 x 70))
= 100(1 + 0.00238)
= 100(1.00238)
= 100.238 cm\(^2\)
= 100.24 cm\(^2\) (to 2 d.p)
Source: Myschool Past Questions Archive (Record #35565)
Physics
WAEC / WASSCE 2012
Heat Energy & Temperature
The thermopile is a device for detecting
A
radioactive radiations
B
radiant energy
C
x-rays
D
the presence of electrons
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 #35567)