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Physics
WAEC / WASSCE 1993
Waves and Optics
Which of the following have the longest wavelengths?
A
Infra-red rays
B
Gamma rays
C
X-rays
D
Ultra-violet rays
E
Radio waves
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 #25015)
Physics
WAEC / WASSCE 1993
Waves and Optics
Solution
A man stands in front of a tall wall and produces a sound. If he receives the echo of the sound two seconds later, calculate his distance from the wall. (The speed of sound in air is 330ms-1)
A
600m
B
400m
C
330m
D
328m
E
165m
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
x = vt/2 = \(\frac {330 \times 2} {2}\) = 660/2 = 330m
Source: Myschool Past Questions Archive (Record #25016)
Physics
WAEC / WASSCE 1993
Waves and Optics
Which of the following is correct about light and sound waves?
A
Both of them are associated with energy transfer
B
Both of them need material media for propagation
C
they are both longitudinal waves
D
their velocities in air are equal
E
Both of them can be polarized
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 #25017)
Physics
WAEC / WASSCE 1993
Waves and Optics
Diagram
Solution
The vector diagram shown below represents the resistance R, the capacitive reactance Xc, the inductive reactance Xc and the impedance, Z in an R-L-C circuit. The current in the circuit will be maximum when
Attached Figure / Diagram
A
XL = XC
B
XL = XL
C
R = XL
D
R = X
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
At resonance XL = XC
Source: Myschool Past Questions Archive (Record #25028)
Physics
UTME / JAMB 1993
Waves and Optics
Solution
The relationship between L and the wavelength I of the stationary wave is
A
2L = \(\lambda\)
B
L = \(\lambda\)
C
L = \(\frac {\lambda}{3}\)
D
4L = 3 \(\lambda\)
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
L = - \(\lambda\) \(\Rightarrow\)4L = 3 \(\lambda\)
Source: Myschool Past Questions Archive (Record #27992)
Physics
UTME / JAMB 1993
Waves and Optics
Solution
Determine the distance between the consecutive antinodes XX if the wavelength is 60cm
A
15cm
B
30cm
C
60cm
D
120cm
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Distance XX = \(\frac{1}{2}\)\(\lambda\)
= \(\frac{1}{2}\) x \(\frac{60}{1}\)
= 30cm
Source: Myschool Past Questions Archive (Record #27995)
Physics
UTME / JAMB 1993
Waves and Optics
Which of the following waves can propagate through a vacuum?
A
High velocity sound waves
B
Ultrasonic waves
C
Acoustic waves
D
Infra-red waves
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 #27996)
Physics
UTME / JAMB 1993
Waves and Optics
Solution
Radio waves emitted from an antenna are picked up by a radar after reflection from an aircraft in 4 x 10\(^{-3}\)S. How far is the aircraft from the antenna? [c = 3 x 10\(^8\)ms\(^{-1}\) ]
A
6.0 x 10\(^2\)km
B
1.2 x 103km
C
3.0 x 103km
D
6.0 x 10 5km
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(\text{Total time (to aircraft and back)} = 4 \times 10^{-3} \, \text{s} \)
\(\text{Speed of radio waves} = 3 \times 10^8 \, \text{m/s}\)
\(\text{Round-trip distance} = 3 \times 10^8 \times 4 \times 10^{-3}\) = 1.2 \(\times 10^6 \, \text{m}\)
\(\text{Actual distance to aircraft} = \frac{1.2 \times 10^6}{2}\)
= 600,000m = 600km.
Source: Myschool Past Questions Archive (Record #27999)
Physics
UTME / JAMB 1993
Waves and Optics
Solution
Which of the following expressions gives the linear magnification produced by a concave mirror of radius of curvature r, if U and V are the object and image distances respectively?
A
\(\frac{V}{r}\) - 1
B
\(\frac{2V}{r}\) - 1
C
\(\frac{U}{r}\) - 1
D
\(\frac{2U}{r}\) - 1
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
F = \(\frac{r}{2}\) and v = mu
F = \(\frac{UV}{U + V}\)
\(\frac{r}{2}\) = \(\frac{U \times mu}{U + mu}\)
\(\frac{r}{2}\) = \(\frac{mu^2}{u(1 + m)}\)
\(\frac{r}{2} = \frac{mu}{1+m}\)
\(\frac{r}{2} = \frac{v}{1+m}\)
\(\frac{2v}{r} = 1+m\)
\(m = \frac{2v}{r} - 1\)
Source: Myschool Past Questions Archive (Record #28003)
Physics
UTME / JAMB 1993
Waves and Optics
Solution
If the focal length of a camera lens is 20cm, the distance from the film at which the lens must be set to produce a sharp image of an object 100cm away is
A
17cm
B
20cm
C
25cm
D
100cm
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
F = \(\frac{uv}{u + v}\)
20 = \(\frac{100 \times v}{100 + v}\)
v = 25cm
Source: Myschool Past Questions Archive (Record #28005)
Physics
UTME / JAMB 1993
Waves and Optics
Which of the following may be used to explain a mirage? i. layers of air near the road surface have varying refractive indices in hot weather. ii. road surfaces sometimes become good reflectors in hot weathers. iii. light from the sky can be reflected upwards after coming close to the road surface.
A
ii only
B
ii and iii only
C
i and iii only
D
i, ii, 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 #28006)
Physics
UTME / JAMB 1993
Waves and Optics
Solution
A beam of light is incident from air to water at an angle of 30oC. Find the angle of refraction if the refractive index of water is \(\frac{4}{3}\)
A
15oC
B
18oC
C
22oC
D
24oC
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\(\frac{4}{3}\) = \(\frac{sin30}{sinr}\)
r = 22oC
Source: Myschool Past Questions Archive (Record #28007)
Physics
UTME / JAMB 1993
Waves and Optics
Which of the following correctly explain(s) why a green leaf appears green in bright day light? i. it absorbs only the green component of sunlight. ii. it absorbs all colour of sunlight except green. iii. it reflects only the green component of sunlight.
A
i only
B
ii only
C
i and iii only
D
ii and iii only
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 #28009)
Physics
UTME / JAMB 1993
Waves and Optics
Diagram
Two mirrors M1 and M2 are inclined at right angles as shown above calculate the angle of reflection of the ray of light at M2
Attached Figure / Diagram
A
\( 30^{\circ} \)
B
\( 45^{\circ} \)
C
\( 60^{\circ} \)
D
\( 90^{\circ} \)
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 #41718)
Physics
WAEC / WASSCE 1992
Waves and Optics
Solution
Which of the following will reduce the frequency of oscillation of a simple pendulum?
A
Increasing the mass of the bob
B
Decreasing the mass of the bob
C
Increasing the length of the string
D
Decreasing the length of the string
E
Increasing the amplitude of oscillation
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
The swing rate of a pendulum is determined by its length. The longer the pendulum, the slower the pendulum swings and vice-versa.
Source: Myschool Past Questions Archive (Record #24250)