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Physics
WAEC / WASSCE 1988
Calorimetry, Latent Heat & Change of State
Which of the following best explains a person suffers more severe burns when his skin is exposed to steam than when boiling water is poured onto his skin?
A
steam is at a higher temperature than boiling water
B
steam posses greater heat energy per unit-mass than boiling water
C
steam spreads more easily over a wider area of the skin than boiling water
D
steam panetrates more easily over a wider area of the skin than boiling water
E
the specific latent heat of vaporization is released in changing from boiling water to steam
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 #21222)
Physics
WAEC / WASSCE 1988
Current Electricity & Electric Circuits
Which of the following statements about radiant heat is/are not correct?
I. radiant heat cannot travel through a vacuum
II. rough surfaces emit radiant heat more than polished surfaces
III. Dark surfaces absorb radiant heat more than bright surfaces
A
I only
B
II only
C
III only
D
I & II only
E
II & III only
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 #21224)
Physics
WAEC / WASSCE 1988
Calorimetry, Latent Heat & Change of State
Solution
0.5kg of water at 10oC is completely converted to ice by extracting 188000J of heat from it. If the specific heat capacity of water is 4200J kg-1C-1, calculate the specific latent heat of fusion of ice.
A
9.0 KJ kg-1
B
84.0 KJ kg-1
C
168.0 KJ kg-1
D
334.0 KJ kg-1
E
336.0 KJ kg-1
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Q = mcΔθ = (0.5 x 4200 x 10) + 0.5L
L = 334000
Source: Myschool Past Questions Archive (Record #21228)
Physics
WAEC / WASSCE 1988
Temperature, Thermometry & Thermal Expansion
The temperature at which the water vapour present in the air is just sufficient to saturate it is called the
A
ice point
B
boiling point
C
steam point
D
dew point
E
saturation point
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 #21229)
Physics
WAEC / WASSCE 1988
Calorimetry, Latent Heat & Change of State
Which of the following instrument may be used to measure the relative humidity?
A
Hydrometer
B
Barometer
C
Manometer
D
Hypsometer
E
Hygrometer
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 #21232)
Physics
WAEC / WASSCE 1988
Current Electricity & Electric Circuits
Which of the following will affect the saturation vapour pressure of a liquid?
A
Temperature of the liquid
B
Humidity of air
C
Volume of vapour
D
Volume of the liquid
E
mass of the liquid
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 #21234)
Physics
WAEC / WASSCE 1988
Reflection, Refraction & Dispersion of Light
Which of the following statements is/are not correct about image formed by a plane mirror?
I. The magnification produced is 1
II. The image distance is same as the object distance
III. The image is real
IV. The image is laterally inverted
A
I only
B
II only
C
III only
D
I & II only
E
II & IV only
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 #21236)
Physics
WAEC / WASSCE 1988
Reflection, Refraction & Dispersion of Light
Solution
A transparent rectangular block 5.0cm thick is placed on a black dot. The dot when viewed from above is seem 3.0cm from the top of the block calculate the refractive index of the material of the block.
A
2/5
B
3/5
C
3/2
D
5/3
E
5/2
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
refractive index = real depth \div apparent depth
→ 5 \div 3
n = 5/3
Source: Myschool Past Questions Archive (Record #21238)
Physics
WAEC / WASSCE 1988
Reflection, Refraction & Dispersion of Light
Solution
The velocities of light in air and glass are 3.0 x10\(^8\)ms\(^{-1}\) and 1.8 \(\times \)10\(^8\) ms\(^{-1}\) respectively. Calculate the sine of the angle of incidence that will produce an angle of refraction of 30^\circ for a ray of light incident on glass.
A
1.2
B
1.0
C
0.8
D
0.6
E
0.3
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\(n_1 \sin(\theta_1)\) = \(n_2 \sin(\theta_2\)
BUT, n = \(\frac{c}{v}\), where c is the speed of light in vacuum (approximately equal to the speed of light in air) and v is the speed of light in the medium.
For air, n\(_1\) = \(\frac{3 \times 10^8}{3 \times 10^8}\) = 1
For glass, n\(_2\) = \(\frac{3 \times 10^8}{1.8 \times 10^8}\) ≈ 1.667
Applying snell's law: \(n_1 \sin(\theta_1)\) = \(n_2 \sin(\theta_2)\) = \(1 \sin(\theta_1)\) = 1.667 sin(30) = 0.83335
Thus, the sine of the angle of incidence is ≈ 0.8
Source: Myschool Past Questions Archive (Record #21240)
Physics
WAEC / WASSCE 1988
Lenses & Optical Instruments
Solution
An object is placed 36cm from a converging lens of focal length 24cm.If a real image which is 4cm high is formed, Calculate the height of the object.
A
2.0cm
B
4.0cm
C
6.0cm
D
8.0cm
E
10.0cm
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
F = 24cm , U = -36cm(behind lense)
Applying Lense formula = \(\frac {1}{f} = \frac{1}{v} - \frac{1}{u}\)
\(\frac{1}{v} = \frac{1}{24} - \frac{1}{36} = \frac{1}{72}\)
v = 72cm
but Magnification = \(\frac{V}{U} = \frac{h^i}{h_o}\)
\(\frac{72}{-36} = \frac{-4}{h_o}\) \( h_1\) = -4( real image is negative)
by cross multiplying \(h_1\) = 2cm
Source: Myschool Past Questions Archive (Record #21242)
Physics
WAEC / WASSCE 1988
Lenses & Optical Instruments
The ability of the eye to focus objects at different distances is called
A
power
B
accommodation
C
normal vision
D
persistence of vision
E
long sight
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 #21244)
Physics
WAEC / WASSCE 1988
Waves, Sound & Vibrations
Solution
The change of the direction of a wave-front because of a change in the velocity of the wave in another medium is called?
A
refraction
B
reflection
C
diffraction
D
interference
E
dispersion
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Refraction: change in direction of propagation of any wave as a result of its traveling at different speeds at different points along the wave front.
Source: Myschool Past Questions Archive (Record #21246)
Physics
WAEC / WASSCE 1988
Current Electricity & Electric Circuits
Solution
A source of sounds produces waves in air of wavelength1.65m. If the speed of sound in air is 330ms-1 the period of vibration in seconds is
A
200
B
2.0
C
0.5
D
0.02
E
0.005
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
T = λ/v
T = 1.65/330 = 0.005
Source: Myschool Past Questions Archive (Record #21247)
Physics
WAEC / WASSCE 1988
Waves, Sound & Vibrations
Which of the following statement s is/are not correct about a standing wave? I. It is formed by the superimposition of two progressive waves traveling in the same direction II. All points on the wave are vibrating with maximum displacement III. It is formed by the superimposition of two progressive waves of different amplitudes traveling in opposite directions
A
I only
B
II only
C
I and II only
D
II and III only
E
I,II and III
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 #21248)
Physics
WAEC / WASSCE 1988
Waves, Sound & Vibrations
Solution
A boy standing a distance from the foot of a tall cliff claps his hands and hears an echo 0.5s later. If the speed of sound is 340ms1, how far is he from the cliff?
A
17m
B
34m
C
85m
D
170m
E
680m
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
X = vt/2 = (340 x 0.5)/2 = 85m
Source: Myschool Past Questions Archive (Record #21249)