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Physics
WAEC / WASSCE 2008
Reflection, Refraction & Dispersion of Light
Solution
The distance between a concave mirror and an object placed in front of it is 1.0m. If the raduis of curvature of the mirror is 4.0m, the image formed will be
A
2.00m behind the mirror
B
2.00m in front of the mirror
C
1.25m in front of the mirror
D
1.25m behind the mirror
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
The focal length of a concave mirror is negative
f = -2m
\(\frac{1}{f} = \frac{1}{v} + \frac{1}{u}\)
\(\frac{1}{-2} = \frac{1}{v} - \frac{1}{1}\)
\(\frac{1}{v} = \frac{1}{-2} + \frac{1}{1}\)
\(\frac{1}{v} = \frac{1}{2}\)
v = 2m
The image distance is 2.0 m in front of the mirror
Source: Myschool Past Questions Archive (Record #35060)
Physics
WAEC / WASSCE 2008
Reflection, Refraction & Dispersion of Light
The image of an object formed by a convex mirror is
A
real, errect and enlarged
B
real, inverted and enlarged
C
virtual, erect and diminished
D
virtual, erect and enlarge
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 #35062)
Physics
WAEC / WASSCE 2008
Reflection, Refraction & Dispersion of Light
Solution
When viewed straight down, a fish in a pond is
A
father below than it appears to be
B
nearer than it appears to be
C
found at exactly the same point it is seen
D
seen beside its image
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
When viewed straight down, a fish in a pond appears nearer than it is. This is due to the bending of light as it travels from water to air, which causes the fish to appear closer to the surface than it is. This phenomenon is called refraction. As a result, the fish's actual position in the water is farther below than it appears to be when viewed from above.
Source: Myschool Past Questions Archive (Record #35064)
Physics
WAEC / WASSCE 2008
Lenses & Optical Instruments
Solution
A converging lens and a screen are placed 20 cm and 80 cm respectively from an object in a straight line so that a sharp image of the object is formed on the screen. If the object is 3cm high. Calculate the height of the image formed
A
1 cm
B
9cm
C
12cm
D
15cm
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(\frac{v}{u} = \frac{hi}{ho} = \frac{60}{20} = \frac{hi}{3}\)
hi = 9cm
Source: Myschool Past Questions Archive (Record #35065)
Physics
WAEC / WASSCE 2008
Lenses & Optical Instruments
Which of the following defects of vision is as a result of the eye ball being too long?
A
long sight
B
astigmatism
C
short sight
D
loss of accommodation
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 #35067)
Physics
WAEC / WASSCE 2008
Waves, Sound & Vibrations
Solution
a sound wave is produced fron a source ans an echo is heard t seconds afterwards. If d is the distance of the reflecting surface from the source, v the speed, p the wavelength and T the period of the wave, then
A
d = \(\frac{2t}{\lambda}\)
B
d = \(\frac{\lambda t}{2T}\)
C
d = \(\frac{2T}{\lambda t}\)
D
d = \(\frac{\lambda T}{2t}\)
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
V = \(\frac{2d}{t}\)
f\(\lambda = \frac{2d}{t} = \frac{\lambda}{T} = \frac{2d}{t}\)
Source: Myschool Past Questions Archive (Record #35069)
Physics
WAEC / WASSCE 2008
Current Electricity & Electric Circuits
A negatively charged rod is held close to an uncharged metal ball on an insulating stand. The ball will
A
be negatively chargeed
B
be positively charged
C
have an excess negatively charges on the side nearest the rod
D
have an excess positively charges on the side nearest the rod
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 #35071)
Physics
WAEC / WASSCE 2008
Current Electricity & Electric Circuits
Solution
If the charge on an object is measured as 4.0 x 10-18C, how many excess electrons does the object possess, given that the charge of an electron is 1.6 x 10-18C
A
18
B
19
C
25
D
37
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\(\frac{4 \times 10^{-18}}{1.6 \times 10^{-19}} = 25\)
Source: Myschool Past Questions Archive (Record #35085)
Physics
WAEC / WASSCE 2008
Magnetism, Electromagnetism & AC Circuits
Fleming's right hand rule is also called the
A
motor rule
B
dynamo rule
C
screw rule
D
thumb rule
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 #35104)
Physics
WAEC / WASSCE 2008
Magnetism, Electromagnetism & AC Circuits
Solution
A transformer is required to supply 12 Vrms to operate a toy train set from a 240 Vrms. If the number of turns in the in the secondary coil is 100, calculate the number of turns required in the primary coil
A
5
B
12
C
2000
D
2400
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(\frac{E_s}{E_p} = \frac{N_s}{N_p} = \frac{240}{12} \frac{100}{N_p}\)
Np = 5
Source: Myschool Past Questions Archive (Record #35106)
Physics
WAEC / WASSCE 2008
Magnetism, Electromagnetism & AC Circuits
Solution
A direct current of 5A flow through a 0.2H inductor. Calculate the energy stored in the inductor
A
0.5J
B
1.0J
C
2.5J
D
5.0J
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
P = \(\frac{1}{2} I^2 L\)
= 5\(^2 \times\) 0.2 \(\times\) \(\frac{1}{2}\)
= 2.5J
Source: Myschool Past Questions Archive (Record #35107)
Physics
WAEC / WASSCE 2008
Atomic, Quantum, Nuclear Physics & Electronics
Both \(\gamma\)-rays and X-rays i. can be produced by thermionic emission ii. have low frequencies iii. have short wavelengths. Which of the statements above is/are correct?
A
i only
B
ii only
C
iii only
D
i and iii 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 #35108)
Physics
WAEC / WASSCE 2008
Atomic, Quantum, Nuclear Physics & Electronics
When a radioactive substance undergoes a beta decay, its
A
mass number decreases by 1
B
atomic number decreases by 1
C
mass number increases by 1
D
atomic number increases by 1
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 #35109)
Physics
WAEC / WASSCE 2008
Current Electricity & Electric Circuits
Which of the following is a unit of the time rate of flow of electric charges?
A
coulomb
B
ampere
C
volt
D
watt
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 #35087)
Physics
WAEC / WASSCE 2008
Current Electricity & Electric Circuits
Solution
A wire 1.0m long and with cross-sectional area 2.0 x 10-7 m2 has a resistance of 0.1\(\Omega\). Calculate the electrical conductivity of the wire
A
2.0 x 107\(\Omega^{-1} m^{-1}\)
B
5.0 x 107\(\Omega^{-1} m^{-1}\)
C
2.0 x 108\(\Omega^{-1} m^{-1}\)
D
5.0 x 108\(\Omega^{-1} m^{-1}\)
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
K = \(\frac{L}{RA} = \frac{1}{0.1 \times 2 \times 10^{-7}} = 5 \times 10^7\)
Source: Myschool Past Questions Archive (Record #35092)