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Physics
WAEC / WASSCE 2017
Waves and Optics
Solution
A converging lens of focal length 10cm forms an erect image three times the size of the real object. Calculate the distance between the image and the object.
A
6.6cm
B
11.1cm
C
13.3cm
D
20.0cm
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Given, image size = 3U
object size = U
focal length = 10cm
lens to object distance = \(\frac{focal length \times object size}{image size}\)
= \(\frac{10 \times u}{3u} = 3.33\)
distance between image and object = 10 + 3.33 = 13.33cm
Source: Myschool Past Questions Archive (Record #50030)
Physics
WAEC / WASSCE 2017
Waves and Optics
Solution
The inverse of the time required for a wave to complete one full cycle is called
A
wavelength
B
period
C
frequency
D
amplitude
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
The time required to complete one full cycle is the period; the inverse of the period gives the frequency.
Source: Myschool Past Questions Archive (Record #50033)
Physics
WAEC / WASSCE 2017
Waves and Optics
Radio wave
Micro wave
Infrared wave
P
Q
R
Gamma Ray
The table above shows the components of electromagnetic spectrum in order of increaasing frequency.Which of the following sets correctly identifies P, Q, R respectively?
A
Visible, ultraviolet, X-ray
B
X-ray, visible, ultraviolet
C
Ultraviolet, visible, X-ray
D
X-ray, ultraviolet, visible
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 #50102)
Physics
WAEC / WASSCE 2017
Waves and Optics
Solution
(a) What is a wavefront?
(b) (i) State two practical uses of glass prisms.
(ii) List two factors that determine the deviation of a ray of light travelling from air into a triangular glass prism.
(iii) Sketch a graph to illustrate the variation of the angle of deviation d, with that of incidence, i, for a ray of light travelling from air into a triangular glass prism. Indicate on the graph the point at which the angle of incidence equal to the angle of emergence e.
(c) (i) Draw and label a diagram of an astronomical telescope in normal adjustment.
(ii) The angular magnification of an astronomical telescope in normal adjustment is 5. If the focal length of the objective is 100cm, calculate the:
(\(\alpha\)) focal length of the eyepiece;
(\(\beta\)) length of the telescope.
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
(a) A Wavefront is a surface over which particles vibrate in the same phase.
(b)(i) Glass prisms are used practically for
(I) changing direction of light I dispersion
(II) viewing distant objects (Binoculars)
(III) determing refractive index of glass
(IV) viewing objects over obstacles (periscope)
(ii) The factors include:
(I) Angle of incidence
(II) refractive index of the prism
(III) refracting angle of the prism
(iii)
(c)
(ii) (\(alpha\)) Magnifiation = \(\frac{F_o}{F_e}\); 5 = \(\frac{100}{Fe}\)
fe = 20cm
(\(\beta\)) length of telescope = \(F_o + F_e = 100 + 20\)
= 120cm
Source: Myschool Past Questions Archive (Record #52892)
Physics
UTME / JAMB 2016
Waves and Optics
Solution
Myopic defects in the human eye can be corrected through the use of a
A
Concave Mirror
B
Concave lens
C
Prism
D
Convex lens
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
In myopia, distant objects appear blurry because light focuses in front of the retina. A concave lens diverges the light rays, shifting the focus point back onto the retina.
Source: Myschool Past Questions Archive (Record #44659)
Physics
UTME / JAMB 2016
Waves and Optics
Solution
An object is placed 15cm in front of a plane mirror. If the mirror is moved further 5cm away from the object and the image is
A
80cm
B
40cm
C
50cm
D
70cm
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
An object is placed 15 cm in front of a plane mirror.
Initial Image Position: The image is 15 cm behind the mirror.
Mirror Movement: The mirror is moved 5 cm further away from the object, making the distance to the mirror 20 cm.
New Image Position: The new image is now also 20cm behind the mirror.
Conclusion
The total distance from the object to the image is 20 cm + 20 cm = 40 cm.
Source: Myschool Past Questions Archive (Record #44666)
Physics
UTME / JAMB 2016
Waves and Optics
Solution
What is the angular magnification of a telescope having objective and eyepiece lenses of a focal lengths 30cm and 3cm respectively?
A
60
B
10
C
30
D
90
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
M = \(\frac{y}{x}\) = \(\frac{30}{3}\)
= 10
Source: Myschool Past Questions Archive (Record #44679)
Physics
UTME / JAMB 2016
Waves and Optics
A boy in a barber's shop sits between two parallel mirrors. The number of images observed by him will be
A
Infinite
B
Ten
C
Eight
D
Forty
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 #44687)
Physics
UTME / JAMB 2016
Waves and Optics
Which of the following electromagnetic waves has the shortest wavelength?
A
Visible Light
B
Ultraviolet rays
C
Infrared rays
D
Gamma rays
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 #44707)
Physics
UTME / JAMB 2016
Waves and Optics
Which of the following waves is both transverse and mechanical?
A
Water waves
B
Radio waves
C
Sound waves
D
X-rays
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 #44709)
Physics
UTME / JAMB 2016
Waves and Optics
Solution
Which of the following is obtained when a magenta is mixed with green colour?
A
Yellow
B
Blue
C
White
D
Red
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
This refers to additive color mixing (mixing colored lights, as in stage lighting, screens, or physics experiments involving primary colors of light).
Source: Myschool Past Questions Archive (Record #44726)
Physics
UTME / JAMB 2016
Waves and Optics
Which of the following statements about wave motion is correct?
A
Electromagnetic waves are transverse
B
Transverse waves do not require a medium for propagation
C
Longitudinal waves vibrate perpendicular to the direction of travel
D
All mechanical waves are longitudinal
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 #44728)
Physics
UTME / JAMB 2016
Waves and Optics
Solution
If the magnification of a virtual image formed by an object 10cm from a convex less is 3, then the focal length of the lens is
A
10cm
B
20cm
C
25cm
D
15cm
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
M = \(\frac{v}{u}\) = 3 = \(\frac{v}{30}\). V = 30m
\(\frac{1}{u}\) + \(\frac{1}{v}\) = \(\frac{1}{f}\) = \(\frac{1}{10}\) - \(\frac{1}{30}\) = \(\frac{1}{f}\)
\(\frac{3 - 1}{30}\) = \(\frac{1}{f}
f = \(\frac{30}{2}\) = 15cm
Source: Myschool Past Questions Archive (Record #44735)
Physics
UTME / JAMB 2016
Waves and Optics
Solution
The frequency of beats produced when two tunning forks of frequencies 258Hz and 270Hz are sounded close to each other
A
6Hz
B
264Hz
C
528Hz
D
12Hz
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Beat = f2 - f1 = 270 - 258 = 12Hz
Source: Myschool Past Questions Archive (Record #44742)
Physics
WAEC / WASSCE 2016
Waves and Optics
Resonance occurs when one vibrating object causes a second object to vibrate at its own natural
A
amplitude
B
speed
C
frequency
D
intensity
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 #45599)