question_answer 1)
When the distance between the object and the plane mirror increases
A)
the image remains same done
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B)
the size of the image will become less than the size of the object done
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C)
the distance between the image and the plane mirror increases done
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D)
the distance between the image and the plane mirror decreases done
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question_answer 2)
In lateral inversion
A)
right side of the object will be right side of the image. done
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B)
left side of the object will be left side of the image. done
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C)
upside of the object will be down side of the object. done
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D)
right side of the object will be left side of the image. done
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question_answer 3)
The sun is seen before the actual sunrise because of
A)
reflection done
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B)
refraction done
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C)
scattering of light done
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D)
rectilinear propagation of light done
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question_answer 4)
Butter paper is an example for............. object.
A)
a transparent done
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B)
a translucent done
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C)
an opaque done
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D)
aluminous done
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question_answer 5)
Power of accommodation of eye implies
A)
control intensity done
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B)
prevent internal reflection of light done
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C)
change of focal length of eye lens done
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D)
All of the above done
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question_answer 6)
Which of the following parts of eye protects the eye and gives it shape?
A)
Choroid done
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B)
Sclera done
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C)
Yellow spot done
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D)
Cleary muscles done
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question_answer 7)
The human eye forms the image of an object at its
A)
cornea done
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B)
iris done
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C)
pupil done
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D)
retina done
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question_answer 8)
Rainbow is caused due to
A)
reflection of sun light from air particles done
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B)
dispersion of sun light from water drops done
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C)
interference of light done
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D)
diffraction of sun rays from water drops done
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question_answer 9)
In the visible spectrum the colour having the shortest wavelength is
A)
green done
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B)
red done
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C)
violet done
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D)
blue done
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question_answer 10)
The splitting of white light into seven colours on passing through a glass prism is due to
A)
refraction done
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B)
reflection done
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C)
interference done
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D)
diffraction done
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question_answer 11)
At sunrise or at sunset the sun appears to be reddish while at mid-day it looks white. This is because
A)
scattering due to dust particles and air molecules causes this phenomenon done
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B)
the sun is cooler at sunrise or at sunset done
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C)
refraction causes this phenomenon done
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D)
diffraction sends red rays to the earth at these times done
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question_answer 12)
A person cannot see objects clearly which are nearer than 75 cm from his eyes, the disease he is suffering from is
A)
astigmatism done
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B)
myopia done
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C)
hypermetropia done
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D)
presbyopia done
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question_answer 13)
For seeing a cricket match, we prefer binoculars to the terrestrial telescope, because.
A)
binoculars give three-dimensional view done
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B)
terrestrial telescope gives inverted image done
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C)
to avoid chromatic aberration done
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D)
to have larger magnification done
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question_answer 14)
Dispersion is the term used to describe
A)
the propagation of light in straight lines done
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B)
the splitting of a beam of light into component colours done
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C)
the bending of a beam of light when it strikes a mirror done
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D)
the change that takes place in white light after passage through red glass done
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question_answer 15)
Consider telecommunication through optical fibres. Which of the following statement is not true?
A)
Optical fibres can be of graded refractive index done
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B)
Optical fibres have extremely low transmission loss done
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C)
Optical fibres are subject to electromagnetic interference from outside done
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D)
Optical fibres may have homogeneous core with a suitable cladding done
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question_answer 16)
An optician while testing the eyes finds the vision of a patient to be 6/12. By this he means that
A)
the person can read the letters of 6 inches from a distance of 12m done
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B)
the person can read the letters of 12 inches from 6 m done
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C)
the person can read the letters of 6 m which the normal eye can read from 12m done
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D)
the focal length of eye lens had become half that off-he normal eye done
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question_answer 17)
A mirage occurs because
A)
the refractive index of atmosphere increases with height done
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B)
the refractive index of atmosphere decreases with height done
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C)
the hot ground acts like a mirror done
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D)
refractive index remains constant with height done
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question_answer 18)
A well cut diamond appears bright because
A)
of reflection of light done
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B)
of dispersion of light done
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C)
of the total internal reflection done
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D)
of refraction of light done
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question_answer 19)
Twinkling of stars is on account of
A)
large distance of stars and storms in air done
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B)
small size of stars done
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C)
large size of stars done
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D)
large distance of stars and fluctuations in the density of air done
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question_answer 20)
A coin in a beaker filled with water appears raised. This phenomenon occurs because of the property of
A)
reflection of light done
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B)
refraction of light done
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C)
total internal reflection of light done
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D)
interference of light done
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question_answer 21)
A spherical air bubble is embedded in a piece of glass. For a ray of light passing through the bubble, it behaves like a
A)
converging lens done
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B)
diverging lens done
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C)
piano-converging lens done
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D)
piano-diverging lens done
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question_answer 22)
'The stars seem to be higher on the sky than they actually are'. This can be explained by
A)
atmospheric refraction done
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B)
dispersion of light done
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C)
total internal reflection done
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D)
diffraction of light done
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question_answer 23)
Yellow colour light is used as fog light because yellow colour
A)
light is most scattered by fog done
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B)
has the longest wavelength among all colours done
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C)
has the longest wavelength among all colours except red and orange but the red colour is already used for brake light and stop light whereas orange colour is avoided due to its similarity with red done
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D)
has the shortest wavelength among all colours done
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question_answer 24)
The mirror used for the head light of a car is
A)
spherical concave done
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B)
plane done
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C)
cylindrical done
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D)
parabolic concave done
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question_answer 25)
Soap bubble looks coloured due to
A)
dispersion done
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B)
reflection done
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C)
interference done
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D)
Any one of these done
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question_answer 26)
A star is emitting yellow light. If it is accelerated towards earth then to an observer on earth, it will appear
A)
shinning yellow done
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B)
gradually changing to violet done
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C)
gradually changing to red done
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D)
unchanged done
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question_answer 27)
What should be refractive index of a transparent medium to be invisible in vacuum?
A)
1 done
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B)
< 1 done
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C)
> 1 done
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D)
None of these done
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question_answer 28)
When a drop of oil is spread on a water surface, it displays beautiful colours in daylight because of
A)
dispersion of light done
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B)
reflection of light done
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C)
polarization of light done
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D)
interference of light done
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question_answer 29)
Smoke emerging from a campfire at the bottom of a hill is being observed by a person at some distance, as shown in the figure. It is evening and the sun has just set behind the hill. Consider regions I and II of the smoke going up the sky
A)
region I will be slightly brighter than the hill and region II will be slightly brighter than the sky done
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B)
region I will be slightly darker than the hill and region II will be slightly brighter than the sky done
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C)
region I will be slightly brighter than the hill and region II will be slightly darker than the sky done
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D)
region I will be slightly darker than the hill and region II will be slightly darker than the sky done
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question_answer 30)
The ability of an optical instrument to show the images of two adjacent point objects as separate is called
A)
dispersive power done
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B)
magnifying power done
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C)
resolving power done
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D)
None of these done
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question_answer 31)
Total internal reflection can take place only if
A)
light goes from optically rarer medium to optically denser medium done
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B)
light goes from optically denser medium to rarer medium done
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C)
the refractive indices of the two media are close to different done
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D)
the refractive indices of the two media are widely different done
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question_answer 32)
The least distance of distinct vision of a normal eye of an adult is
A)
25m done
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B)
25cm done
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C)
25 mm done
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D)
None of these done
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question_answer 33)
Rear-view mirror used in a vehicle is a
A)
concave mirror done
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B)
convex mirror done
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C)
plane mirror done
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D)
None of these done
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question_answer 34)
Magnification produced by a rear view mirror fitted in vehicles
A)
is less than one done
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B)
is more than one done
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C)
is equal to one done
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D)
can be more than or less than one depending upon the position of the object in front of it done
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question_answer 35)
A child is standing in front of a magic mirror. She finds the image other head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top.
A)
Plane, convex and concave done
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B)
Convex, concave and plane done
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C)
Concave, plane and convex done
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D)
Convex, plane and concave done
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question_answer 36)
When a CD (compact disc used in audio and video systems) is seen in sunlight, rainbow like colours are seen. This can be explained on the basis of the phenomenon of
A)
reflection and diffraction done
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B)
reflection and transmission done
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C)
diffraction and transmission done
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D)
refraction, diffraction and transmission done
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question_answer 37)
A watch shows times as 3 : 25 when seen through a mirror, time appeared will be
A)
8:35 done
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B)
9:35 done
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C)
7:35 done
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D)
8:25 done
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question_answer 38)
The fine powder of a coloured glass is seen as
A)
coloured done
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B)
white done
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C)
black done
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D)
that of the glass colour done
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question_answer 39)
For which wavelength of light is our eye most sensitive
A)
3.00 nm done
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B)
555 nm done
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C)
200 nm done
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D)
800 nm done
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question_answer 40)
The acronym for LASER is
A)
Light Amplification by Stimulated Emission of Radiation done
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B)
Low Amplitude Stimulated Emission of Radiation done
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C)
Low Amplitude Short Energy Radiation done
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D)
Light Amplification by Short Energy Radiation done
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