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Physics
WAEC / WASSCE 1989
Units, Measurements & Dimensional Analysis
Which of the following is a derived unit?
A
Metre
B
Coulomb
C
Kilogram
D
Second
E
Ampere
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 #23894)
Physics
WAEC / WASSCE 1989
Current Electricity & Electric Circuits
Solution
An engine raises 1000kg of water through a height of 60m in 20s. What is the power of the engine? (Take g = 10ms-2>).
A
120,000 W
B
30,000 W
C
333 W
D
300 W
E
30 W
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
P = mgh/t = (1000 \(\times\) 10 \(\times\) 60) \(\div\) 20 = 30,000 W.
Source: Myschool Past Questions Archive (Record #23895)
Physics
WAEC / WASSCE 1989
Temperature, Thermometry & Thermal Expansion
Solution
A thermometer has its stem marked in millimeter instead of degree Celsius. The lower fixed point is 30mm and the upper is 180mm. Calculate the temperature in degree celsius when the thermometer reads 45mm.
A
67.5oC
B
30.0oC
C
25.0oC
D
15.0oC
E
10.0oC
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
θ = (x/y) x 100.
where x = UFP -LFP -another scale, and y = UFP - LFP for celsius scale.
=> {(45-30)/(180-30)} x 100 = 10.0oC
Source: Myschool Past Questions Archive (Record #23899)
Physics
WAEC / WASSCE 1989
Current Electricity & Electric Circuits
Which of the following surfaces will radiate heat energy best?
A
Red
B
White
C
Black
D
Yellow
E
Blue
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 #23900)
Physics
WAEC / WASSCE 1989
Calorimetry, Latent Heat & Change of State
Solution
Which of the following statements is/are not correct?
A
Evaporation takes place only at the surface of the liquid
B
Boiling takes place throughout the volume of the liquid
C
Evaportaion takes place at all temperatures
D
Boiling takes place at a particular temperature for a liquid at a fixed external pressure
E
The boiling point of a liquid is not affected by impurities
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
The boiling point of a liquid is not affected by impurities
Source: Myschool Past Questions Archive (Record #23909)
Physics
WAEC / WASSCE 1989
Calorimetry, Latent Heat & Change of State
Solution
Water in an open container boils at a lower temperature when heated at the top of a mountain than at sea-level because at the top of a mountain the
A
relative humidity is higher than at sea-level
B
rays of the sun adds more heat to the water
C
temperature is lower than that at sea-level
D
pressure is lower than that at sea-level
E
pressure is more than that at sea-level
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Refer to Elementary physics, pressure reduces with height.
Source: Myschool Past Questions Archive (Record #23910)
Physics
WAEC / WASSCE 1989
Current Electricity & Electric Circuits
Which of the following substance is not a good conductor of electricity?
A
Human body
B
Glass
C
Aluminium
D
Earth
E
Copper
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 #23911)
Physics
WAEC / WASSCE 1989
Calorimetry, Latent Heat & Change of State
Solution
Calculate the heat energy required to vapourize 50g of water initially at 80oC if the specific heat capacity of water is 4.2Jg-1K (specific latent heat of vapourization of water is 2260Jg-1).
A
533000J
B
230000J
C
117200J
D
113000J
E
4200J
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Q = McΔθ + ml
Q = {50 x 4.2 x (100 - 80) + 50 x 2260} 117200J.
Source: Myschool Past Questions Archive (Record #23912)
Physics
WAEC / WASSCE 1989
Calorimetry, Latent Heat & Change of State
Solution
All the heat generated by a current of 2A passing through a resistor of 6\Omega for 25s is used to evaporate 5 g of a liquid at its boiling point. What is the specific latent heat of the liquid?
A
60 Jg-1
B
120 Jg-1
C
300 Jg-1
D
360 Jg-1
E
1500 Jg-1
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Electrical Energy = Heat Energy.
I2Rt = ml
22 x 6 x 25 = 5 x L.
L = 120 Jg-1.
Source: Myschool Past Questions Archive (Record #23914)
Physics
WAEC / WASSCE 1989
Electrostatics & Capacitors
Which of the following instruments can be used to compare the relative magnitudes of charges on two given bodies?
A
The electrophorous
B
Ebonite rod
C
Proof plane
D
Gold leaf electroscope
E
Capacitor
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 #23915)
Physics
WAEC / WASSCE 1989
Current Electricity & Electric Circuits
A short chain is usual attached to the back of a petrol tanker trailing behind it to ensure that the
A
petrol tanker is balanced on the wh eel
B
heat generated by friction in the engine can be conducted to the floor
C
charges generated by friction in the tanker can be conducted to the earth
D
the tanker moves slowly as the chain touches the floor
E
chain produces sound for the resonance of the tanker engine
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 #23916)
Physics
WAEC / WASSCE 1989
Reflection, Refraction & Dispersion of Light
Solution
A ray of light is incidence on a plane mirror at an angle of 35o. What is the angle by the reflected ray with the surface of the mirror?
A
125o
B
70o
C
65o
D
55o
E
35o
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
The angle of reflection is always equal to the the angle of incidence, which is the angle that the incoming ray, called incident ray makes with the normal.
(Please note that the angle of incidence and angle of reflection are always defined in terms of angle the ray makes with the normal. There is nothing like "angle of reflection with respect to mirror)
The angle of incidence can be calculated from the angle incident rays makes the reflection surface as:
Angle of incidence = 90 - Angle made with reflecting surface
The angle with the reflecting surface, that is mirror, is given as 35 degrees.
Therefore:
Angle of incidence = 90 - 35 = 55 degrees
And
Angle of reflection = angle of incidence = 55 degrees
Source: Myschool Past Questions Archive (Record #23917)
Physics
WAEC / WASSCE 1989
Current Electricity & Electric Circuits
The image in a pine-hole camera is always
A
diminished
B
enlarged
C
upright
D
inverted
E
blurred
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 #23918)
Physics
WAEC / WASSCE 1989
Reflection, Refraction & Dispersion of Light
Solution
The refractive index of a given transparent medium is 1.4. Which of the following is the minimum internal angle for total internal reflection to take place in the medium?
A
30o
B
36o
C
44o
D
46o
E
54o
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Critical angle Sin \(\theta\)\(_c\) = \(\frac{n_2}{n_1}\)
where n\(_1\) = refractive index of the medium ( 1.4 given )
n\(_2\) = refractive index of the second medium( air ≈ 1.0)
Sin\(\theta\)\(_c\) = \(\frac{1}{1.4}\) ≈ 0.7143
\(\theta\)\ = Sin\(^{-1}\)( 0.7143) ≈ 45.58º ≈ 46º
The minimum internal angle for total internal reflection to take place in the medium is approximately = 46º
Source: Myschool Past Questions Archive (Record #23919)
Physics
WAEC / WASSCE 1989
Waves, Sound & Vibrations
The distance between a node and an anti-node for a transverse wave is equal to
A
the wavelength
B
thrice the wavelength
C
one-half of the wavelength
D
one-quater of the wavelength
E
three quaters of the wavelength
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 #23920)