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Physics
UTME / JAMB 1992
Waves and Optics
Solution
Which of the following characteristics of a wave is used in the measurement of the depth of the sea?
A
diffraction
B
interference
C
refraction
D
reflection
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Reflection: These waves travel through the water, hit the seabed, and bounce back toward the surface. This phenomenon is called reflection, and the returned sound is known as an echo
Source: Myschool Past Questions Archive (Record #28074)
Physics
UTME / JAMB 1992
Waves and Optics
Solution
A note is the octave of another note if it has
A
a frequency twice that of the first note
B
frequency half that of the first note
C
the same fundamental frequency as the first one
D
a frequency frequency eight times that of the first note
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
When the frequency of a note is doubled, it is perceived as being one octave higher. For example, if a note has a frequency of fff, the note one octave higher will have a frequency of 2f. Conversely, a note that is one octave lower has a frequency half that of the original note, but the question specifically asks for the octave above
Source: Myschool Past Questions Archive (Record #28075)
Physics
UTME / JAMB 1992
Waves and Optics
Solution
What is the frequency of the sound made by a siren having a disc with 32 holes and making 25 revolution per seconds?
A
80Hz
B
600Hz
C
800Hz
D
1600Hz
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
No of holes x Revolution
F = NH x NR
= 32 x 25
= 800Hz
Source: Myschool Past Questions Archive (Record #28079)
Physics
UTME / JAMB 1992
Waves and Optics
Which of the following properties make the convex mirror useful as a driving mirror? i. the image is real. ii. the image is erect. iii. it has a wide field of view. iv. the image is magnified.
A
i, ii, and iv
B
i, ii, iii
C
ii and iii
D
i and iii
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 #28080)
Physics
UTME / JAMB 1992
Waves and Optics
Solution
When an object is placed very close to the pole of a concave mirror, the virtual image obtained is
A
diminished and upright
B
diminished and inverted
C
enlarged and inverted
D
enlarged and upright
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
When an object is placed very close to the pole of a concave mirror, the mirror produces a virtual image larger than the object and upright. This occurs because the object is within the focal point of the concave mirror.
Source: Myschool Past Questions Archive (Record #28082)
Physics
UTME / JAMB 1992
Waves and Optics
Solution
A concave mirror has a radius of curvature of 36cm. At what distance from the mirror should an object be placed to give a real image three times the size of the object?
A
12cm
B
24cm
C
48cm
D
108cm
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
F = \(\frac{uv}{u + v}\)
v = 3u
18 = \(\frac{3u \times u}{3u + u}\)
u = 24cm
Source: Myschool Past Questions Archive (Record #28084)
Physics
UTME / JAMB 1992
Waves and Optics
Solution
The speed of light in air is 3 x 10\(^8\)ms\(^{-1}\). What is the speed in glass with a refractive index of 1.50?
A
1.5 x 108ms-1
B
3.0 x 108ms-1
C
2.0 x 108ms-1
D
6.0 x 108ms-1
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
n = \(\frac{\text{c}}{\text{v}}\)
1.5 = \(\frac{3 \times 10^8}{v}\)
v = 2.0 x 108ms-1
Source: Myschool Past Questions Archive (Record #28091)
Physics
UTME / JAMB 1992
Waves and Optics
Which of the following arrangements of the components of electromagnetic spectrum is in ascending order of wavelengths?
A
Gamma rays, ultraviolet rays, X- rays, infra - red rays
B
Gamma rays, X-rays, ultraviolet rays, infra-red rays
C
infra-red rays, ultraviolet rays, X-rays, gamma rays
D
Gamma rays, ultraviolet rays, infra-red rays, X-rays
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 #28095)
Physics
UTME / JAMB 1992
Waves and Optics
In alternating current theory, the units of impedance, r.m.s. voltage and resonance frequency are respectively equal to
A
volt, ampere and hertz
B
ohms, volt and hertz
C
watt, ohms and radian
D
ohms, hertz and joule
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 #28110)
Physics
UTME / JAMB 1992
Waves and Optics
The threshold of frequency for photoelectric effect depends on the
A
intensity of incident light
B
frquency of incident light
C
material of the photocathode
D
potential difference between the cathode and the anode
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 #28112)
Physics
WAEC / WASSCE 1992
Waves and Optics
Solution
(a)(i) What is meant by resonance?
(ii) Outline the necessary steps taken in a simple experiment to illustrate top resonance
(iii) Explain why a vibrating tuning fork sounds louder when its stem is pressed against a table top than when held in air.
(b) Explain with the aid of diagrams, how a concave mirror could be used to: (i) Ignite a piece of carbon paper; (ii) produce an exact copy of a picture on a screen.
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
(a) Resonance occurs when one vibrating body sets other body into vibration at its own natural frequency as a result of impulse received from the first body. (ii) Simple experiment to illustrate resonance.
The apparatus is arranged as shown. A cylinder is 3/4 filled with water and a tube is dipped into the water so that the length I can be varied. A tuning fork f is set vibrating just above the tube but not touching it. As the fork is set vibrating the length I is gradually increased. A point is reached when a large sound is heard. At this point resonance has occurred because the vibrating tuning fork has set the air in the tube vibrating at its own frequency.
(b)
Parallel light rays are reflected by a concave mirror on a piece of carbon paper. The converging of the rays on the carbon paper will cause it to ignite.
The object O is kept on the centre of curvature of a concave mirror. An exact but inverted image I is formed at the centre of curvature where the screen should be placed.
Source: Myschool Past Questions Archive (Record #54779)
Physics
UTME / JAMB 1991
Waves and Optics
Which of the following is TRUE of light and sound waves?
A
they both transmit energy
B
they both need a mediumfor propagation
C
they are both transverse waves
D
their velocities in air are equal
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 #28185)
Physics
UTME / JAMB 1991
Waves and Optics
When a plane mirror at which a ray is incident is rotated through an angle \( \theta \), the reflected ray will be rotated through
A
\(\frac{1}{2}\)\(\theta\)
B
\(\theta\)
C
2\(\theta\)
D
3\(\theta\)
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 #28187)
Physics
UTME / JAMB 1991
Waves and Optics
In a ray diagram for a thin converging lens, a ray that is not parallel to the optic axis but passes through the optic center will
A
pass through undeviated
B
pass through the center of curvature after refraction
C
emerge parallel to the principal axis
D
pass through the principal focus after refraction
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 #28189)
Physics
UTME / JAMB 1991
Waves and Optics
Solution
Which of the following correctly, describes the image of an object, 4cm from a diverging lens of focal length 12cm?
A
The image is virtual, 3cm in front of the lens
B
The image is real, 6cm behind the lens
C
The image is virtual, 6cm in front of the lens
D
The image is real, 3cm in front the lens
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
F = \(\frac{uv}{u + v}\)
F = -ve
-12 = \(\frac{4 \times v}{4 + v}\)
v = -3cm
Source: Myschool Past Questions Archive (Record #28190)