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Physics
WAEC / WASSCE 1999
Calorimetry, Latent Heat & Change of State
Calculate the heat energy required to change 0.1kg of ice at 0oC to water boiling at 100oC. (Specific heat capacity of water = 4200 J kg-1K-1) (Specific latent heat of fusion of ice = 336,000 J kg-1)
A
75,600J
B
336,000J
C
340,200J
D
378,000J.
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 #25484)
Physics
WAEC / WASSCE 1999
Calorimetry, Latent Heat & Change of State
Which of the following statements about evaporation is not correct?
A
The rate of evaporation of a liquid varies with temperature
B
The molecules of an evaporating liquid have an average speed
C
Evaporation occurs when faster molecules escape from the surface of a liquid
D
Evaporation takes place inside a liquid.
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 #25485)
Physics
WAEC / WASSCE 1999
Calorimetry, Latent Heat & Change of State
Calculate the power rating of an immersion heater used for 10 minutes to increase the temperature of 10kg of water by 15K. (Specific heat capacity of water = 4200 J l-1K-1)
A
1,050W
B
16,800W
C
18,060W
D
20,160W
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 #25486)
Physics
WAEC / WASSCE 1999
Reflection, Refraction & Dispersion of Light
Solution
A ray of light is incident on 'a plane mirror at an angle of 20o. This mirror is rotated through, twice this angle, In this new position the angle between the incident ray and the reflected ray is
A
20o
B
40o
C
80o
D
120o.
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
GIVEN:
The angle of incidence i = 20º, Rotation of the mirror = 2 x 20º = 40º, Then the new angle of incidence i after rotation of mirror = 20º + 40º
But, angle of reflection r = angle of incidence i ( law of reflection)
Therefore, the angle between the incident ray and the reflected ray = i + r = 60º + 60º = 120º
Source: Myschool Past Questions Archive (Record #25487)
Physics
WAEC / WASSCE 1999
Waves, Sound & Vibrations
The air column in a resonance tube is set into resonance by a vibrating tuning fork. The resultant waves in the air column will be
A
mechanical and transverse
B
progressive and longitudinal
C
stationary and transverse
D
stationary and longitudinal.
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 #25488)
Physics
WAEC / WASSCE 1999
Reflection, Refraction & Dispersion of Light
The refractive index of glass for yellow light is greater than that for red light because yellow light
A
has a greater amplitude than red light
B
is more intense than red light
C
travels more slowly than red light
D
deviates less than red light
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 #25490)
Physics
WAEC / WASSCE 1999
Lenses & Optical Instruments
The real image of an object formed by a converging lens of focal length 15cm, is three times the size of the object. Calculate the object distance
A
60cm
B
30cm
C
20cm
D
15cm
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 #25491)
Physics
WAEC / WASSCE 1999
Lenses & Optical Instruments
Which of the following statements is not correct about long sight?
A
A Iong-sighted person can see distant objects clearly
B
ight from a nearby object is focused behind the retina.
C
The eyeball is too short
D
The defect is corrected by using a diverging lens.
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 #25492)
Physics
WAEC / WASSCE 1999
Waves, Sound & Vibrations
The amplitude of a wave is the
A
distance between two successive troughs of the wave
B
separation of two adjacent particles vibrating in phase
C
maximum displacement of the wave particle from the equilibrium position
D
distance travelled by a wave in a complete cycle of its motion
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 #25493)
Physics
WAEC / WASSCE 1999
Current Electricity & Electric Circuits
ln order to obtain a sound note of a high pitch from a wire stretched by a constant tension, the wire must be
A
short and thick
B
short and thin
C
long and thick
D
long and thin
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 #25494)
Physics
WAEC / WASSCE 1999
Waves, Sound & Vibrations
If the position of resonance in a resonance tube is 16.50cm from open end of the tube, calculate the distance from the open end to the next position where resonance occurs. (Neglect end-correction)
A
24.75cm
B
33.00cm
C
41.25cm
D
49.50cm
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 #25495)
Physics
WAEC / WASSCE 1999
Lenses & Optical Instruments
Thunder is usually heard some seconds after lightning is observed because
A
the human eye is more sensitive to light than the ear to sound
B
sound and light travel in different media
C
thunder occurs after lightning
D
light travels faster than sound
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 #25496)
Physics
WAEC / WASSCE 1999
Electrostatics & Capacitors
Diagram
Solution
Using the diagram above, calculate the effective capacitance of the circuit
Attached Figure / Diagram
A
1.56μf
B
3.00μF
C
3.71μF
D
9.00μF
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(C_1\) = 3\muF + 4\muF = 7\muF ( capacitance in parallel )
\(\frac{1}{ C} = \frac{ 1}{2} + \frac{1}{7} = \frac{ 7 + 2 }{14} = \frac{9}{14}\)
∴ C = \(\frac{14}{9}\) = 1.56\muF
Source: Myschool Past Questions Archive (Record #25498)
Physics
WAEC / WASSCE 1999
Current Electricity & Electric Circuits
The parts of a bar magnet at which the magnetic effect is strongest are called the
A
poles
B
neutral points
C
magnetic declinations
D
magnetic meridians
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 #25499)
Physics
WAEC / WASSCE 1999
Current Electricity & Electric Circuits
A resistance wire of length 2 m and of uniform cross-sectional area 5.0 x 10-7 m2 has a resistance of 2.2 Ω Calculate its resistivity
A
1.8 x 10-7Ωm
B
5.5 x 10-7Ωm
C
1.8 x 10-7Ωm
D
5.8 x 107Ωm
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 #25500)