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Physics
UTME / JAMB 1995
Waves and Optics
Solution
The pitch of an acoustic device can be increased by
A
increasing the frequency
B
increasing the amplitude
C
decreasing the loudness
D
decreasing the intensity
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Increasing the frequency of a sound wave raises its pitch. The amplitude affects the loudness, but not the pitch.
Source: Myschool Past Questions Archive (Record #27839)
Physics
UTME / JAMB 1995
Waves and Optics
Solution
What is the approximate critical angle for total internal reflection for diamond if the refractive index of diamond is 2.42?
A
21o
B
22o
C
23o
D
24o
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
SinC = \(\frac{1}{n}\)V2
SinC = \(\frac{1}{2.42}\)
SinC =24o
Source: Myschool Past Questions Archive (Record #27841)
Physics
UTME / JAMB 1995
Waves and Optics
Solution
A real object is placed at a distance ucm in front of a curved mirror of focal length fcm. If the image is upright and magnified, then the mirror is
A
convex and u =2f
B
concave and u = 2f
C
convex and u = f
D
concave and u = f
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
-The image formed by a concave lens is always virtual, erect and magnified.
-The image formed by a concave mirror can be real or virtual, enlarged or diminished, and erect or inverted, depending upon the distance of the object from the mirror
Source: Myschool Past Questions Archive (Record #27842)
Physics
UTME / JAMB 1995
Waves and Optics
Solution
Which of the following pairs of colours gives the widest separation in the spectrum of white light?
A
Red and Violet
B
Green and Yellow
C
Red and Indigo
D
Yellow and Violet
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
When white light is passed through a glass prism it splits into its spectrum of colours (violet, indigo, blue, green, yellow, orange, and red) and this process of separating white light into its constituent colours is called dispersion.
Source: Myschool Past Questions Archive (Record #27843)
Physics
WAEC / WASSCE 1994
Waves and Optics
The image of an object placed at the center of the curvature of a concave mirror is
A
Inverted and magnified
B
at the principal focus
C
real and diminshed
D
Erect and virtual
E
at the center of the curvature
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 #26252)
Physics
WAEC / WASSCE 1994
Waves and Optics
A simple magnifying glass is used to view an object. At what distance from the lens must the object be placed so that an image 5 times the size of the object is produced 20cm from the lens?
A
2cm
B
4cm
C
15cm
D
25cm
E
100cm
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 #26253)
Physics
WAEC / WASSCE 1994
Waves and Optics
Solution
Which of the following are transverse waves? I. Ripples on water II. Sound waves in air III. Light waves from the sun?
A
II only
B
I only
C
II and III only
D
I and III only
E
I, II, and III.
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Transverse waves cause the medium to move perpendicular to the direction of the wave. Longitudinal waves cause the medium to move parallel to the direction of the wave.
Examples of Transverse waves are water waves, light waves, radio waves and string / rope waves.
Important example of Longitudnal waves is sound wave.
Source: Myschool Past Questions Archive (Record #26255)
Physics
WAEC / WASSCE 1994
Waves and Optics
Which of the following has the shortest wavelength?
A
Infrared rays
B
Gamma rays
C
Ultra violet rays
D
Radio waves
E
Visible light
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 #26256)
Physics
WAEC / WASSCE 1994
Waves and Optics
Which of the following scientists postulated that moving particles exhibit wave properties?
A
Niels Bohr
B
Ernest Rutherford
C
Werner Heisenberg
D
Louis de Broglie
E
Erwin Schroedinger
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 #26259)
Physics
WAEC / WASSCE 1994
Waves and Optics
A rectangular coil can rotate in a magnetic field. The two ends of the coil are soldered respectively to the two halves of a commutator. Two carbon brushes are made to press lightly against the commutator and when these are connected in a circuit with a battery and a rheostat, the coil rotates. This is a description of
A
a moving coil ammeter
B
a D.C generator
C
a D.C electric motor
D
An induction coil
E
An A.C generator
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 #26262)
Physics
WAEC / WASSCE 1994
Waves and Optics
Solution
The wave function of a metal is 8.0 x \(10^{-19}\)J. Calculate the wavelength of its threshold frequency. (Speed of light in a vacuum = 3 x \(10^8ms^{-1}, Planck's constant = 6.6 \times 10^{-34}\)Js)
A
0.8 x \(10^{-7}\)m
B
1 x \(10^{-7}\)m
C
2.3 x \(10^{-7}\)m
D
3.8 x \(10^{-7}\)m
E
12.4 x \(10^{-7}\)m
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\(\theta = E - E_f = h_f = \frac{v}{\lambda} \Rightarrow = \lambda = \frac{h_v}{\theta}
\frac{6.6\times 10^{-34} \times 3 \times 10^{8}}{8.6 \times 10^{-19}} = 0.8 \times 10^{-7}\)m
Source: Myschool Past Questions Archive (Record #26274)
Physics
WAEC / WASSCE 1994
Waves and Optics
Solution
A light wave travels from air into a medium of refractive index 1.54. If the wavelength of the light in air is \(5.9\times10^{-7}\)m, calculate its wavelength in the medium
A
\(2.5\times10^{-7}\)m
B
\(3.8\times10^{-7}\)m
C
\(4.6\times10^{-7}\)m
D
\(5.2\times10^{-7}\)m
E
\(6.1\times10^{-7}\)m
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
n =\(\frac{wavelength\, in\, air}{wavelength\, in \,medium}= \frac{5.9\times10^{-7}}{1.54}= 3.8\times10^{-7}\)m
Source: Myschool Past Questions Archive (Record #26285)
Physics
UTME / JAMB 1994
Waves and Optics
Solution
The equation of transverse wave traveling along a string is given by Y = 0.3 sin(0.5x - 50t) where Y and X are in cm and t is in seconds.Find the maximum displacement of the particles from the equilibrium position
A
50.0cm
B
2.5 cm
C
0.5cm
D
0.3cm
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Y = 0.3 sin(0.5x - 50t) compare with,
y = A sin(kx - wt)
A = 0.3m
Source: Myschool Past Questions Archive (Record #27915)
Physics
UTME / JAMB 1994
Waves and Optics
Solution
The sound from a source travelled to the bottom of the sea and the echo was heard 4s later. If the speed of sound in sea water is 1500ms-1 the depth of the sea is
A
6000m
B
3000m
C
1500m
D
375m
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
t = 4s ; v = 150ms-1
depth = X ; but 2X = vt
X = \(\frac {vt}{2}\) = \(\frac {1500 \times 4}{2}\)
X = 3000m
Source: Myschool Past Questions Archive (Record #27916)
Physics
UTME / JAMB 1994
Waves and Optics
Solution
The fundamental frequency of vibration of a sonometer wire may be halved by
A
doubling the length of the wire
B
doubling the mass of the wire
C
reducing the tension by half
D
reducing the absolute temperature by half
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
F \(\alpha\) \(\frac{1}{L}\)
Source: Myschool Past Questions Archive (Record #27921)