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WorksheetsChapter 7 Multiple choice
Total questions: 50
Worksheet time: 25mins
Light has ......... nature.
only particle
only wave 🌊
both particle and wave
The ........ are particles of light.
proton
photons
positrons
The bending of ruler partly immersed in water is due to......... of light.
reflection
refraction
diffraction
......... wave can travel through vacuum.
Light
Sound
Water
The velocity of light is ......... in a more optically dense medium.
greater
smaller
equal
Splitting of white light into different colour-band is called......... of light.
refraction
reflection
dispersion
The concept of........... is used in cutting the faces of diamond.
reflection
refraction
total internal reflection
The refractive index of glass is ......... that of air.
greater than
smaller than
equal
The refractive index of diamond is ...........that of glass.
greater than
smaller than
equal
The refractive index of the prism for ........... colour is the smallest.
violet
red
yellow
The refractive index of the prism for ......... colour is the largest.
violet
red
yellow
In the total internal reflection prism........ of the light is reflected.
10%
50%
100%
Total reflecting prisms are used in ........ .
microscope
telescope 🔭
periscope
The wavelength of visible light lies between............ .
400 nm and 700 nm
400 mm and 700 mm
400cm and 700 cm
The incident ray and the refracted ray are in the same ........... .
medium
plane
place
The angle of incidence and angle of refraction are in the same .......... .
medium
plane
place
The angle of incidence and angle of refraction are in ......... media.
same
different
opaque
The angle of incidence is equal to the angle of........ for a ray passing through a glass slab with parallel sides.
reflection
refraction
emergence
The angle of incidence corresponding to the......... 90° is called critical angle.
angle of reflection
angle of refraction
angle of deviation
For refraction to take place .......... optical media are required.
two
one
no
In refraction, the velocity of light changes........... .
only magnitude
only direction
both magnitude and direction
When a ray of light passes from water to air, the velocity of light is......... .
decreases
increases
does not change
The angle of incidence is equal to the angle of emergence when the angle of deviation is ....... .
very small
minimum
maximum
When white light is dispersed by a prism, the ......... colour is deviated least.
violet
blue
red
The more optically dense medium is , the ....... is the velocity of light in the medium.
greater
smaller
faster
When white light is dispersed by a prism, the........ colour is deviated most.
violet
blue
red
.......... are used to examine the objects which are difficult to see.
Light pipe
Closed pipe
Underground pipe
The critical angle is the......... corresponding to the angle of refraction 90°.
angle of reflection
angle of incidence
angle of deviation
All optical phenomena can be explained........... .
by Huygens' wave 🌊 theory
by Newton's corpuscular theory
both are wrong
If c1 is the velocity of light coming from the sun 🌞 and c2 is that coming from the candle 🕯️ flame, then ........ .
c1 > c2
c1 < c2
c1 = c2
Mirages are formed because............
the ground acts as a reflecting surface
the refractive index of air decrease with height
the refractive index of air increase with height
Mirages are formed due to............
deviation of light
dispersion of light
total internal reflection of light
In a periscope, two glass prisms are used. This image seen is.............
erect
accompanied by the object
magnified
The velocity of light is directly proportional to the...........
frequency
wavelength
optical density
The.........of light in a medium depends upon the optical density of that medium.
frequency
velocity
amplitude
The..........colour-band is deviated the most from the original path of the white light.
violet
red
yellow
Violent light, having a..........wavelength than the red light.
shorter
longer
softer
Total internal reflection occur when light passes from .......... dense medium.
less to more
more to less
air to vacuum
The..........is also called Snell's law.
laws of refraction
first law of refraction
second law of refraction
Electromagnetic wave with lowest frequency is ........... .
radio waves
ultraviolet
gamma rays
Electromagnetic waves travel ......... .
without medium
with medium
with medium and without medium
Waves with highest frequency is............
radio waves
ultraviolet
gamma rays
Electromagnetic waves obey the law of.........
refraction only
reflection only
refraction and reflection both
Electromagnetic waves are...........
transverse waves
longitudinal waves
latitudinal waves
Speed of electromagnetic waves in vacuum is ............ .
30 x 10⁸ ms⁻¹
4 x 10⁸ ms⁻¹
3 x 10⁸ ms⁻¹
Air,water and oil are ............ media.
opaque
transparent
non of these
The refractive index of air is......... .
greater than one
one
less than one
The .......... of light can be explained based on particle nature of light.
polarization
interference
refraction
The ........ deviated colour by a prism is red colour.
most
least
high test
When the angle of incidence is greater than the critical angle, the......... can occur.
total internal reflection
total internal refraction
refraction
