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Physics
UTME / JAMB 2012
Waves and Optics
After reflection from the concave mirror, rays of light from the sun converges
A
at the radius of curvature
B
at the focus
C
beyond the radius of curvature
D
between the focus and radius of curvature
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 #27407)
Physics
UTME / JAMB 2012
Waves and Optics
I. Rays of light travel from a less dense medium to a denser medium. II. The Angle of incidence is greater than critical angle. III. Rays of light travel from a denser medium to a less dense medium. Which of the statements above are conditions for total internal reflection to occur?
A
I & II only
B
I & III only
C
II & III only
D
II only
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 #27409)
Physics
UTME / JAMB 2012
Waves and Optics
The use of lenses is Not applicable in the
A
projector
B
human eye
C
periscope
D
telescope
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 #27411)
Physics
UTME / JAMB 2012
Waves and Optics
Disperson of white light is the ability of white light to
A
penetrate air, water and glass
B
move in a straight line
C
move around corners
D
separate to its component colours
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 #27412)
Physics
WAEC / WASSCE 2012
Waves and Optics
The time of flight for a projectile motion is given by the expression
A
\(\frac{U sin \theta}{g}\)
B
\(\frac{U sin \theta}{2g}\)
C
\(\frac{2U sin \theta}{g}\)
D
\(\frac{U sin 2\theta}{g}\)
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 #35530)
Physics
WAEC / WASSCE 2012
Waves and Optics
When two waves are superimposed on each other, the following occurrences are possible, except
A
nodal lins
B
anti nodal lines
C
stationary waves
D
dispersion
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 #35587)
Physics
WAEC / WASSCE 2012
Waves and Optics
Which of the following properties of waves is exclusive to transverse waves?
A
reflection
B
interference
C
diffraction
D
polarization
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 #35589)
Physics
WAEC / WASSCE 2012
Waves and Optics
Solution
An object of height 2.5cm is places 20cm from a convex mirror of focal length 10cm. Calculate the height of its image.
A
2.5 cm
B
3.0cm
C
5.0cm
D
25.0cm
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(\frac{1}{v} = \frac{1}{f} - \frac{1}{u}\)
= \(\frac{1}{10} - \frac{1}{2} = \frac{1}{20}\)
v = 20
but h\(_i\) = \(\frac{v \times h_o}{u}\)
= \(\frac{20 \times 2.5 }{20}\)
= 2.5cm
Source: Myschool Past Questions Archive (Record #35592)
Physics
WAEC / WASSCE 2012
Waves and Optics
Solution
A ray of light passes from air to water to glass to air. Given that the refractive index for light passing from air to water is \(\frac{4}{3}\) and air to glass is \(\frac{3}{2}\), calculate the refractive index of glass relative to water
A
0.50
B
0.67
C
0.75
D
1.13
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
\(_{g} \eta _{w} = \frac{ _g \eta _a}{ _a \eta _w}\)
= \(\frac{3}{2} \times \frac{1}{\frac{4}{3}}\)
= \(\frac{3}{2} \times \frac{3}{4}\)
= \(\frac{9}{8}\)
= 1.125
= 1.13 (to 2 d.p)
Source: Myschool Past Questions Archive (Record #35594)
Physics
WAEC / WASSCE 2012
Waves and Optics
An object is placed at a point X between the focal point F and the optical centre C of a diverging lens. If F is the focal point on the other side of the lens, the image of the object is formed between
A
F and X
B
X and C
C
C and F
D
F and 2F
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 #35596)
Physics
WAEC / WASSCE 2012
Waves and Optics
The sound heard by a person after the reflection of the sound generated by him is called
A
reverberation
B
resonance
C
echo
D
audibility
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 #35605)
Physics
WAEC / WASSCE 2012
Waves and Optics
Solution
Which of the following sets of coloured light is/are secondary colours i. Red, Blue and green ii. Blue, cyan and magneta iii. Green, Magenta and yellow, IV Yellow, Cyan and Magenta
A
i and ii only
B
ii and iii only
C
iv only
D
i, ii and iv only
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
IV. (Yellow, Cyan, Magenta) is the only complete set of secondary colours.
Source: Myschool Past Questions Archive (Record #35607)
Physics
WAEC / WASSCE 2012
Waves and Optics
Solution
A ray of light is incident on an air-glass boundary at an angle \(\theta\). If the angle between the partially reflected ray and the refracted ray is 90^\circ, calculate \(\theta\), given that the refractive index of glass is 1.50.
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
n = \(\frac{sin i}{sin r}\)
1.5 = \(\frac{sin \theta}{sin(190 - \theta)} = \frac{sin \theta}{cos theta} = \tan \theta\)
Hence, 0 = tan\(^{-1}\) 1.5 = 56.31\(^o\)
Source: Myschool Past Questions Archive (Record #53207)
Physics
WAEC / WASSCE 2012
Waves and Optics
Solution
Explain why sound waves cannot be plane Polarized.
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
Sound waves are longitudinal waves which cannot be plane polarized as polarization is a characteristic of transverse waves only.
Source: Myschool Past Questions Archive (Record #53214)
Physics
WAEC / WASSCE 2012
Waves and Optics
Solution
Explain why it is desirable to install an air conditioner near the ceiling of a room and not close to the floor.
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
Air molecules near the ceiling get cooled, become denser and sink while warmer air moleculus below being lighter rise to the top, get cooled, become denser and sink once more, thereby sets up conventional current.
Source: Myschool Past Questions Archive (Record #53217)