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Physics
WAEC / WASSCE 2001
Waves and Optics
Solution
A piece of cloth appears green in sunlight. When held in red light, it will appear
A
green
B
blue
C
red
D
black
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
A piece of cloth that appears green in sunlight reflects green light and absorbs other colors. When held in red light, it will not reflect any red light because it does not contain red pigments to reflect that color.
Source: Myschool Past Questions Archive (Record #33912)
Physics
WAEC / WASSCE 2001
Waves and Optics
Solution
Dispersion of white light by a glass prism occurs because
A
white light consist of a mixture of seven different colour
B
the refractive index of glass is different from each constituent colour of white light
C
the speed of each colour of light in the glass is proportional to the refractive index of glass for each colour
D
the speed of each colour of light in the glass is proportional to the angle of refraction in he prism
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Dispersion of white light by a glass prism occurs because the refractive index of glass varies for each color. This difference causes each color to bend at a different angle, resulting in a spectrum of colors.
Source: Myschool Past Questions Archive (Record #33913)
Physics
WAEC / WASSCE 2001
Waves and Optics
Solution
Which of the following statements about sound is correct?
A
when sound travels from air to a denser medium, it is refracted away from the normal at the point of incidence
B
sound travels faster in air than in water
C
the wavelength of sound changes when it travels from to water
D
the frequency of it travels from air to water
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
When sound moves from air (a less dense medium) to water (a denser medium), its speed increases, leading to a change in wavelength while the frequency remains constant.
Source: Myschool Past Questions Archive (Record #33914)
Physics
WAEC / WASSCE 2001
Waves and Optics
Diagram
Solution
The diagram above shows the wire of a sonometer box set into resonance by a vibrating tuning fork of frequency f, when the wire is stretched by a tension T, the resonating length of the wire is I while the wavelength of the sound produced is \(\lambda\). Which of the following statements is not correct? The wave produced on the wire is
Attached Figure / Diagram
A
stationary and lonitudinal
B
stationary and mechanical
C
mechanical and longitudinal
D
progessive and transverse
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The wave produced on the wire in the sonometer box is:
> Stationary (standing wave)
> Transverse, not longitudinal.
Source: Myschool Past Questions Archive (Record #33917)
Physics
WAEC / WASSCE 2001
Waves and Optics
Diagram
Solution
The diagram above shows the wire of a sonometer box set into resonance by a vibrating tuning fork of frequency f, when the wire is stretched by a tension T, the resonating length of the wire is I while the wavelength of the sound produced is \(\lambda\). Which of the following statements about the frequency of vibration of the wire is not correct?
Attached Figure / Diagram
A
proportional to the mass per unit length of the wire
B
equal to the frequency of the tuning fork
C
inversely proportional to the length of the wire
D
proportional to the sqare root of the tension
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The frequency of a vibrating stretched string or wire depends on three factors (i) Length of string l, (ii) Tension T, and (iii) Mass per unit length M
F ∝ \(\frac{1}{\text{l}}\)\(\sqrt{\frac{\text{T}}{\text{M}}}\)
From the formula above, the frequency of vibration of the wire is not proportional to the mass per unit length of the wire.
Source: Myschool Past Questions Archive (Record #33920)
Physics
WAEC / WASSCE 2001
Waves and Optics
Solution
If the frequency of the tuning fork at resonance is 256Hz, calculate the frequency of vibration of the wire when the tension in he wire is increased to 196N
A
130.6Hz
B
182.9Hz
C
358.4Hz
D
501.8Hz
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\(\frac{f}{256} = \sqrt{\frac{196}{100}}\)
f = \(\sqrt{\frac{256^2 \times 196}{100}}\)
= 356.4Hz
Source: Myschool Past Questions Archive (Record #33932)
Physics
WAEC / WASSCE 2001
Waves and Optics
Solution
Electrons passing through crystals are diffracted because they
A
are repelled by the atoms in the crystal
B
are attracted by the atoms in the crystals
C
possess wave properties
D
are particles
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Electrons passing through crystals are diffracted due to their wave properties. This wave-like behavior allows them to interact with the periodic arrangement of atoms in the crystal, leading to diffraction patterns similar to those seen with light waves. Thus, the correct answer is C. possesses wave properties.
Source: Myschool Past Questions Archive (Record #33950)
Physics
NECO SSCE 2001
Waves and Optics
The invisible part of the spectrum of white light consists of
A
Infra-red and ultra-violet only
B
Infra-red, ultra-violet and blue only
C
red, orange and green only
D
red and violet only
E
yellow and indigo 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 #42811)
Physics
NECO SSCE 2001
Waves and Optics
Solution
Totally reflecting prisms are preferred to mirrors in periscopes because
I. mirror gives multiple images
II. silvering on mirrors is easily damaged
III. mirrors reflect less light than totally reflecting prisms
A
I only
B
I and II only
C
I and III only
D
II and III only
E
I,II and III
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
Total internal reflection in prisms occurs without loss of light, while mirrors can have some absorption and scattering. Thus, totally reflecting prisms generally reflect more light, and the silvering (reflective coating) on mirrors can be easily scratched or damaged, which makes them less durable than totally reflecting prisms.
An ordinary mirror is that it reflects from both surfaces. giving multiple reflections.
Source: Myschool Past Questions Archive (Record #42814)
Physics
NECO SSCE 2001
Waves and Optics
Solution
Notes of the same frequency sounded on a piano and on a flute may differ in
I. pitch
II. quality
III. Loudness
A
I only
B
II only
C
I and III only
D
II and III only
E
I, II and III
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Quality is that characteristic note which distinguishes the two sounds of the same loudness and same pitch but emitted by two different instruments.
Source: Myschool Past Questions Archive (Record #42816)
Physics
NECO SSCE 2001
Waves and Optics
An object placed 15cm from a converging lens forms a real image whose magnification is 2.0. What is the focal length of the lens?
A
5.00cm
B
10.00cm
C
15.00 cm
D
18.00 cm
E
20.00cm
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 #42820)
Physics
NECO SSCE 2001
Waves and Optics
Solution
Which is a stringed Instrument?
A
drum
B
flute
C
piano
D
saxophone
E
trumpet
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
A piano is a stringed instrument. It produces sound by hammers striking tuned strings when keys are pressed, though it's often classified as a percussion instrument as well due to the striking mechanism.
Source: Myschool Past Questions Archive (Record #42822)
Physics
NECO SSCE 2001
Waves and Optics
The wavelength of a stationary wave is 24.0cm. What is the distance between a node and the next antinodes?
A
6.0cm
B
12.0cm
C
18.0cm
D
24.0cm
E
48.0cm
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 #42824)
Physics
NECO SSCE 2001
Waves and Optics
The speed of sound travelling in various media increases in the order:
A
air, iron bar, water
B
air, water, iron bar
C
iron, bar water, air
D
water, air, iron bar
E
water, iron bar, air
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 #42835)
Physics
NECO SSCE 2001
Waves and Optics
An object is placed 15cm in front of a concave mirror of focal length 20cm. The image formed is
A
real, inverted and diminished
B
real, inverted and magnified
C
virtual, erect and diminished
D
virtual, erect and magnified
E
virtual, inverted and magnified
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 #42839)