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Physics
UTME / JAMB 2007
Waves and Optics
Solution
When an object is placed between the principal focus and the optical center of a convex lens, it could be used as a?
A
Simple microscope
B
refecting lens
C
compound microscope
D
projector
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Simple microscope: A single convex lens used to magnify small objects. It allows the viewer to see details that are not visible to the naked eye.
Source: Myschool Past Questions Archive (Record #13960)
Physics
UTME / JAMB 2007
Waves and Optics
Solution
The production of pure spectrum could easily be achieved using a?
A
glass prism with a pin
B
triangular prism with two convex lens
C
traingular prism only
D
triangular prism with two concave lenses
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
A pure spectrum can be produced using a triangular prism-two converging lenses and a narrow slit of white light
Source: Myschool Past Questions Archive (Record #13962)
Physics
UTME / JAMB 2007
Waves and Optics
Solution
The fundamental frequency of a plucked wire under a tension of 400N is 250Hz. When the frequency is changed to 500 Hz at constant length, the tension is
A
1600N
B
400N
C
160N
D
40N
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The fundamental frequency is related to tension as
F ∝ √T
=>F= K√T
∴F1=F2=>250=500√T1√T2√400√T2
∴√T2 = 500√400 = 2 x 20250
∴ T2 = 402 = 1600N
Source: Myschool Past Questions Archive (Record #14387)
Physics
WAEC / WASSCE 2007
Waves and Optics
Solution
A block of mass 4.0kg causes a spiral spring to extend by 0.16m from its unstretched position. The block is removed and another body of mass 0.50kg is hung from the same spiral spring. If the spring is then stretched and released, what is the angular frequency of the subsequent motion? [g = 10 ms -2]
A
10\(\sqrt 5\) rads-1
B
5\(\sqrt 2\) rads-1
C
5 rads-1
D
\(\sqrt 5\) rads-1
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
K = \(\frac{F}{e} = \frac{4}{0.16} = 250\)
F = \(\frac{1}{T} = \frac{1}{2 \pi \frac{\sqrt{m}}{k}}\)
= \(\frac{1}{2 pi \frac{\sqrt{0.5}}{250}}\)
= 10\(\sqrt{5}\)
Source: Myschool Past Questions Archive (Record #34849)
Physics
WAEC / WASSCE 2007
Waves and Optics
Which of the following phenomena is not a direct consequence of rectilinear propagation of light?
A
lunar and solar eclipses
B
images of objects in a pin hole camera
C
diffraction of light
D
shadows of opaque object
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 #34900)
Physics
WAEC / WASSCE 2007
Waves and Optics
An object is placed 10cm in front of a plane mirror. If it is moved 8cm away father away from the mirror, determine the distance of the final image from the mirror
A
2cm
B
9cm
C
16cm
D
18cm
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 #34917)
Physics
WAEC / WASSCE 2007
Waves and Optics
In which of the following piece of apparatus is the radius of curvature equal to twice the focal length?
A
converging lens
B
diverging lens
C
converging mirror
D
parabolic mirror
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 #34919)
Physics
WAEC / WASSCE 2007
Waves and Optics
When an object is placed at the centre of curvature of a concave mirror, its image is formed at
A
the focus
B
infinity
C
the centre of curvature
D
a distance twice the radius of curvature
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 #34922)
Physics
WAEC / WASSCE 2007
Waves and Optics
Solution
A rectangular glass prism of thickness d and absolute refractive index n is placed on a point object which is viewed vertically downward from above the prism. Which of the following expressions correctly defines the apparent upward displacement of the object?
A
\(\frac{d}{n}\)
B
dn
C
\(\frac{d}{n - 2}\)
D
\(\frac{d(n - 1)}{n}\)
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
n = \(\frac{R.d}{A.d}\)
R.d = \(\frac{R.d}{n} = \frac{d}{n}\)
Source: Myschool Past Questions Archive (Record #34932)
Physics
WAEC / WASSCE 2007
Waves and Optics
Which of the following wave is electromagnetic?
A
x-rays
B
sound waves
C
water waves
D
tidal waves
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 #34897)
Physics
WAEC / WASSCE 2007
Waves and Optics
The distance between two points P and Q, along a wave is 0.05m. If the wave length of the wave is 0.10m, determine the phase angle between P and Q in radians
A
0.1\(\pi\)
B
\(\pi\)
C
2\(\pi\)
D
10\(\pi\)
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 #34898)
Physics
WAEC / WASSCE 2007
Waves and Optics
Solution
A sounding tuning fork is brought near the open end of a pipe containing air and the loudness of the sound is observed to increase. This observation is due to
A
an echo
B
resonance
C
interference
D
reverbration
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
When the frequency of the tuning fork matches the natural frequency of the air column in the pipe, resonance occurs. This causes the air in the pipe to vibrate more vigorously, amplifying the sound and increasing its loudness.
Source: Myschool Past Questions Archive (Record #34938)
Physics
WAEC / WASSCE 2007
Waves and Optics
Which of the following statements about sound wave is not correct? Sound waves can be
A
reflected
B
refracted
C
diffracted
D
polarized
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 #34940)
Physics
WAEC / WASSCE 2007
Waves and Optics
If a gas is excited by high voltage to produce a discharge and the light is examined in a spectrometer
A
an explosion is observed
B
the rainbow colours are seen
C
an emission spectrum is observed
D
dark lines are observed
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 #34950)
Physics
WAEC / WASSCE 2007
Waves and Optics
Which of the following electromagnetic wave can be detected by its heating effect?
A
ultraviolet radiation
B
x-rays
C
gamma rays
D
infrared radiation
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 #34949)