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Physics
NECO SSCE 2003
Waves and Optics
A body that produces its own light is said to be
A
luminous
B
non-incandescent
C
opaque
D
translucent
E
transparent
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 #42916)
Physics
NECO SSCE 2003
Waves and Optics
The motion of the prongs of a sounding turning fork is
A
circular
B
oscillatory
C
random
D
rotational
E
translational
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 #42919)
Physics
NECO SSCE 2003
Waves and Optics
The distance between two successive crests of a water wave is 0.5m. If a particle on the surface of the water wave makes two complete vertical oscillations in 1s, calculate the speed of the wave.
A
0.25ms-1
B
0.50ms-1
C
1.00ms-1
D
2.00ms-1
E
4.00ms-1
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 #42931)
Physics
NECO SSCE 2003
Waves and Optics
Which of the following scientists postulated that moving particles exhibit wave properties?
A
Ernest Rutherford
B
Erwin Schroedinger
C
Frank Hertz
D
Louis de Broglie
E
Werner Heisenberg.
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 #42935)
Physics
NECO SSCE 2003
Waves and Optics
Solution
An object is placed 30 cm in front of a concave mirror of focal length 20cm. Calculate the distance between the object and the image.
A
90cm
B
40cm
C
30cm
D
20cm
E
10cm
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Given:Object distance, \( u = 30 \,\text{cm} \)
Focal length of concave mirror, \( f = 20 \,\text{cm} \)
Using the mirror sign convention for a concave mirror:
\(u = -30 \,\text{cm}, \quad f = -20 \,\text{cm}\)
Using: \(\frac{1}{f} = \frac{1}{u} + \frac{1}{v}\)
Substitute values:
\(\frac{1}{-20} = \frac{1}{-30} + \frac{1}{v}\)
\(\frac{1}{v} = -\frac{1}{20} + \frac{1}{30}\)
=\(\frac{-3 + 2}{60}\)
= -\(\frac{1}{60}\)
\(v = -60 \,\text{cm}\)
Distance between object and image:
\(= |v - u| = |-60 - (-30)| = 30 \,\text{cm}\)
Source: Myschool Past Questions Archive (Record #42943)
Physics
NECO SSCE 2003
Waves and Optics
Which of the following properties is NOT exhibited by sound waves?
A
Diffraction
B
interference
C
Polarisation
D
Reflection
E
Refraction
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 #42944)
Physics
NECO SSCE 2003
Waves and Optics
An evidence of the wave nature of matter is
A
Browniam motion
B
Compton effect
C
diffraction
D
diffusion
E
photo electricity
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 #42945)
Physics
WAEC / WASSCE 2003
Waves and Optics
Solution
a) (i) Illustrate, using a ray diagram, how an image can be formed by a convex mirror.
(ii) State one advantage rid one disadvantage of using a convex mirror as a iving mirror.
(iii) Explain the action of a compound microscope.
(b) Illustrate using labelled diagrams only, sonometer wire of length I, vibrating at its fundamental (ii) first overtone (iii) second overtone
(c) A tuning fork vibrating at a frequency of 512 Hz is held over the top of a jar filled with water and fitted with a tap at the buttom. If the jar is 60 cm tall and the speed of sound is 350 ms\(^{-1}\), determine the possible resonance position(s).
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
(a)(i)
(ii) Advantages of using a convex mirror as driving mirror.
– It has wide field of view
– Image is always erect.
Disadvantages;
– Image is always smaller than the object
– It gives a false impression of the distance as image seems further away.
(iii) The objective lens forms the image of an object placed beyond its focal length within the focal length of eye piece. This image is real inverted and magnified. This image serves as object to the eye piece which functions as a simple microscope to form a final virtual and magnified image.
(c) \(\lambda = \frac{v}{f} = \frac{350}{512} = 0.68m\)
1st resonance position = \(\frac{\lambda}{f} = \frac{0.68}{4} = 0.17m\)
2nd resonance position = \frac{3\lambda}{4} \frac{3 \times 0.68}{4} = 0.51m\)
3rd resonance position = \(\frac{5\lambda}{4} = \frac{5 \times 0.85}{4} = 0.85m\)
Since 0.85m is greater than the length of the jar (0.6m), therefore only the first and second resonance positions are possible.
Source: Myschool Past Questions Archive (Record #54040)
Physics
WAEC / WASSCE 2003
Waves and Optics
Solution
Using the diagram above as a guide, carry out the following instructions:
Fix. the drawing paper provided on the drawing board
Place the mirror vertically with its longer side resting on the drawing paper. Trace the outline AB of the mirror. Remove the mirror.
Draw a normal PQ to meet the outline at the middle Q.
Draw a straight line through A to meet the outline of the mirror at the right angle.
Trace the incident ray, Q with pins \(P_1\) and \(P_2\) so that it meets the perpendicular line through A at C such that CA=X= 1.0m.
Replace the mirror on its outline. Locate the images of \(P_1\)\(P_2\) through the mirror using two other pins \(P_3\) and \(P_4\) so that \(P_3\) and \(P_4\) and the images of \(P_1\) and \(P_2\) are in a straight line.
Remove the mirror and pins \(P_3\) and \(P_4\).
Draw a straight line through the pin points to meet AB at Q and CA produced at D.
Measure and record angle ACQ as è\(_{1}\), and angle ADCQ as è\(_{2}\). Also, record the value of x. Evaluate è = (è\(_{1}\) + è\(_{2}\)), x\(^{-1}\) and tan è.
Repeat the procedure for four other values of x = 2.0, 3.0, 4.0 and 5.0cm. Tabulate your readings.
Plot a graph of tan è on the vertical axis against x on the horizontal axis.
Determine the slope, s, of the graph. Evaluate k = 2s
State two precautions taken to ensure accurate results. Attach your traces to your answer booklet.
(b)i. Distinguish between regular and diffused reflections.
ii. An object is situated 25cm in front of a plane mirror. Determine the distance of the image from the object. What is the size of the image relative to the object?
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
Table of values / observations
S/N
\(\theta_{1}^{o}\)
\(\theta_{2}^{o}\)
x(cm)
x\(^{-1}\)(cm\(^{-1}\))
\(\theta\)=½(\(\theta_{1}\) + \(\theta_{2}\))
tan\(\theta\)
1
83.0
81.0
1.0
1.00
82.0
7.115
2
76.0
74.0
2.0
0.50
75.0
3.732
3
69.0
70.0
3.0
0.33
69.5
2.675
4
62.0
63.0
4.0
0.25
62.5
1.921
5
57.0
58.0
5.0
0.20
57.5
1.570
Slope (s) = \(\frac{\bigtriangleup {tan \theta}}{\bigtriangleup {x}^{-1}} = \frac{7.2-1.2}{1-0.14} = \frac{6}{0.86}\) = 6.977 \(\approx\) 6.98
K = 25 = 2x 6.977 = 13.954, \(\approx\) 14
Precautions: i
The optical pins must be straight and not bent. i.e pins are vertical
Avoid error due to parallax
Ensure reasonable spacing of pins
Ensure that the object pins and the image pins are in a straight line.
Ensure the Use of a sharp-pointed pencil so as to obtain neat traces and accurate angular measurement.
(b)i. Regular reflection occurs on a smooth surface giving rise to uniform (same) turning back of light rays when they fall on a surface. Diffused reflection occurs on a rough surface giving rise to a non-uniform (different) turning back to light rays when they fall on a surface.
ii.
Distance of the image from the object = 25-(-25)
= 25 + 25 =50cm
The size of the image is the same as the object.
Source: Myschool Past Questions Archive (Record #60083)
Physics
UTME / JAMB 2002
Waves and Optics
Solution
Which of the following is a characteristics of stationary waves?
A
They are formed by two identical waves travelling in opposite directions
B
they can be transverse or longitudinal
C
The distance between two successive nodes is one wavelenght
D
The antinode is a point of minimum displacement
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
They are produced by the superposition of two progressive identical waves travelling in opposite directions
Source: Myschool Past Questions Archive (Record #9681)
Physics
UTME / JAMB 2002
Waves and Optics
To produce an enlarged and erect image with a concave mirror,the object must be positioned
A
at the principal focus
B
beyond the centre of curvature
C
between the principal focus and the centre of the curvature
D
between the principal focus and the pole
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 #9711)
Physics
UTME / JAMB 2002
Waves and Optics
Which of the following eye defects can be corrected using a cylindrical lens.
A
myopia
B
Astigmatism
C
Presbyopia
D
Chromatic abiration
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 #9717)
Physics
UTME / JAMB 2002
Waves and Optics
Solution
A concave mirror of radius of curvature 40 cm forms a real image twice as large as the object.
the object distance is
A
10 cm
B
30 cm
C
40 cm
D
60 cm
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
if r = 40 cm , then f = r/2 = 40/2 = 20 cm
then for a real image by a concave mirror,
magnification M = f/u-f => 2 = 20/U-20
therefore 2(u-20) = 20
2u - 40 = 20
2u = 40 + 20
2u = 60/2 = 30 cm
Source: Myschool Past Questions Archive (Record #9740)
Physics
UTME / JAMB 2002
Waves and Optics
Solution
a ray of light which strikes a glass slab from air at normal incidence passes through the slab
A
undeviated and undisplaced at a lower speed
B
deviated and undisplaced at a lower speed
C
deviated and displaced at a lower speed
D
undeviated and displaced at a faster speed
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The angle of refraction will be zero as the angle of incidence is zero in this case. This is a rule, that whenever a ray strikes perpendicularly or normally to a surface, no refraction will take place and hence the ray will pass through without deviating from its path.
Source: Myschool Past Questions Archive (Record #9753)
Physics
UTME / JAMB 2002
Waves and Optics
The phenomenon that makes sound persist when its source has been removed is known as
A
acoustic vibration
B
rarefaction
C
echo
D
reverberation
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 #9791)