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Physics
WAEC / WASSCE 1998
Calorimetry, Latent Heat & Change of State
Solution
How much heat is emitted when a body of mass 200g cools from 37oC to 31oC? (specific heat capacity of the body = 0.4Jg-1K-1,)
A
4800J
B
1200J
C
480J
D
202J
E
80J
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
H = mC\(\theta\) = 200 x 0.4 x 6
= 480J
Source: Myschool Past Questions Archive (Record #33564)
Physics
WAEC / WASSCE 1998
Temperature, Thermometry & Thermal Expansion
Solution
If the cubic expansivity of brass between 27oC and 100oC is 5.7 x 10-5K-1, What is its linear expansivity?
A
2.85 x 10-5K-1
B
1.90 x 10-5K-1
C
1.86 x 10-5K-1
D
1.70 x 10-5K-1
E
1.63 x 10-5K-1
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(\alpha\) = \(\frac{\Delta}{3} = \frac{5.7 \times 10^{-5}}{3}\)
= 1.90 x 10-5K-1
Source: Myschool Past Questions Archive (Record #33572)
Physics
WAEC / WASSCE 1998
Current Electricity & Electric Circuits
Solution
Air at temperature 527oC and pressure 30 atmospheres is admitted into the cylinder of an engine. Calculate the pressure of the gas when it has expanded to 5 times its volume and cooled to 127oC as it leaves the engine
A
1.5 atmospheres
B
2.5 atmospheres
C
3.0 atmospheres
D
12.8 atmospheres
E
15.0 atmospheres
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\(\frac{V_1P_1}{T_1} = \frac{V_2P_2}{T_2}\)
\(\frac{1 \times 30}{527 + 2733} = \frac{5P_2}{127 + 273}\)
\(\frac{30}{800} = \frac{5p_2}{400}\)
P2 = \(\frac{400 \times 30}{800 \times 5}\)
= 3
Source: Myschool Past Questions Archive (Record #33580)
Physics
WAEC / WASSCE 1998
Gas Laws & Heat Transfer
The inside of a vacuum flak is usually coated with silver to reduce heat loss by
A
evaporation
B
radiation
C
conduction
D
convention
E
condensation
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 #33581)
Physics
WAEC / WASSCE 1998
Current Electricity & Electric Circuits
Diagram
As the end Q of the plank is raised, the component of W, normal to plank, will
Attached Figure / Diagram
A
increase
B
decrease
C
remain the same
D
be slightly greater than W
E
be independent of w
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 #33510)
Physics
WAEC / WASSCE 1998
Atomic, Quantum, Nuclear Physics & Electronics
Diagram
Solution
If \(\theta\) is equal to \(\alpha\) at the time the box is just about to slide down the plank, the coefficient of static friction between the plank and box is
Attached Figure / Diagram
A
sin\(\alpha\)
B
cos\(\alpha\)
C
tan\(\alpha\)
D
sec\(\alpha\)
E
cot\(\alpha\)
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\(\mu = \frac{F}{R} = \frac{W sin \theta}{W cos q}\)
= tan\(\theta\)
Source: Myschool Past Questions Archive (Record #33516)
Physics
WAEC / WASSCE 1998
Work, Energy, Power & Simple Machines
Diagram
I the box is pulled from P to Q, which of the following expresses the velocity ratio of the inclined plane?
Attached Figure / Diagram
A
PR/PQ
B
OR/PQ
C
OR/PR
D
PQ/PR
E
PQ/QR
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 #33517)
Physics
WAEC / WASSCE 1998
Elasticity, Density, Pressure & Fluids
Solution
a pilot records the atmospheric pressure outside his plane as 63cm of Hg while a ground observer records a reading of 75cm of Hg with his barometer. Assuming that the density of air is constant, calculate the height of the plane above the ground. (take the relative densities of air and mecury as 0.00136 and 13.6 respectively)
A
120m
B
138m
C
274m
D
1200m
E
120,000m
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
pressure change for air = pressure change for mercury
hpg = Hpg
h x 0.00136 x g = (75 - 63) x 13.6 x g
h = \(\frac{12 \times 13.6}{0.00136}\)
= 120,000cm
= 1,200m
Source: Myschool Past Questions Archive (Record #33539)
Physics
WAEC / WASSCE 1998
Current Electricity & Electric Circuits
Solution
An object is protected with a velocity of 100m-1 at an angle of 60o to the vertical. Calculate the time taken by the object to reach the highest point (Take g as 10ms-2
A
5.0s
B
8.7s
C
10.0s
D
17.3s
E
20.0s
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
t = \(\frac{T}{2} = \frac{1}{2} = \frac{2u \sin \theta}{g} = \frac{100 \times \sin 60}{10}\)
10 sin60 = 10 x 0.8660
= 8.7
Source: Myschool Past Questions Archive (Record #33541)
Physics
WAEC / WASSCE 1998
Current Electricity & Electric Circuits
Solution
Dry oxygen is trapped by a pellet of mercury in a uniform capillary tube which is sealed at one end. The length of the column of oxygen at 27oC is 50cm. if the pressure of the oxygen is constant, at what temperature will the length be 60cm?
A
360.0oC
B
240.6oC
C
237.0oC
D
87.0oC
E
36oC
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
T1 = \(\frac{V_1T_2}{V_2} = \frac{60 \times (273 + 27)}{50}\)
= 360k
= 360 - 273
= 87.0oC
Source: Myschool Past Questions Archive (Record #33585)
Physics
WAEC / WASSCE 1998
Calorimetry, Latent Heat & Change of State
A piece of metal is heated until it becomes red-hot, it is then quickly transferred into a beaker containing boiling water. What effect will this have on the boiling water?
A
the boiling water rises slightly
B
the boiling point rises sharply
C
the rate of vaporisation of the boiling water increases
D
the boiling point first rises and then falls
E
neither the boiling point nor the rate of vaporisation increases
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 #33592)
Physics
WAEC / WASSCE 1998
Calorimetry, Latent Heat & Change of State
Solution
A 90-W immersion heater is used to supply energy for five minutes. The energy supplied is used to completely melt 180g of a solid at is melting point. Neglecting energy losses to the surroundings, calculate the specific latent heat of fusion of the solid
A
0.5Jg-1
B
2.5Jg-1
C
15.0Jg-1
D
450.0Jg-1
E
150Jg-1
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
Pt = mL
L = \(\frac{pt}{m} = \frac{90 \times 60 \times 5}{180}\)
= 150Jg\(^{-1}\)
Source: Myschool Past Questions Archive (Record #33594)
Physics
WAEC / WASSCE 1998
Current Electricity & Electric Circuits
If an ebonite rod is rubbed with fur
A
both the ebonite rod and the fur will be negatively charged
B
the ebonite rod will be positively charged while the fur will have no charge
C
there will be electron transfer only if the ebonite rod is earthed
D
the ebonite rod will be negatively charged while the fur will be positively charged
E
the ebonite rod will be positively charged while the fur will be negatively charged
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 #33598)
Physics
WAEC / WASSCE 1998
Current Electricity & Electric Circuits
An eclipse of the sun by the moon occurs when the sun, the moon and the earth are in a straight line and the
A
earth casts a shadow on the moon
B
moon casts a shadow on the sun
C
moon is between the sun and the earth
D
earth is between the sun and the moon
E
sun is between the moon and the earth
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 #33600)
Physics
WAEC / WASSCE 1998
Waves, Sound & Vibrations
The phenomenon which occurs when light changes direction as it passes from one medium to another is called
A
reflection
B
polarisation
C
interference
D
diffraction
E
refraction
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 #33601)