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WorksheetsGrade 8 - Camera and Eyes
Total questions: 20
Worksheet time: 15mins
What is the function of sensor in a digital camera?
stops the light hitting it.
detects light falling on it.
adjusts the amount of light that enters into camera.
How sensor can detect light falling on it?
energy transferred by light causes electrical changes.
the lens focuses the light.
aperture changes in size.
What happens to the light that passes through cornea?
it gets reflected.
it gets shattered.
it gets refracted.
what is the function of iris in the eye?
it detect colours.
it focuses the light.
it controls the size of pupil.
why pupil gets smaller in bright light?
to get as much light as possible.
to prevent damaged to eye due to bright light.
to make sure light gets refracted.
The image formed on the retina is _____________
upside
upside down
rotated at 90 degrees angle.
The transparent covering of eye is called ___________.
pupil
iris
cornea
Which part of the camera focuses light?
sensor
shutter
lens
special cells in the retina change the light energy into electrical impulses called ___________
optic impulses
nerve impulses
connective impulses
Nerve impulses are sent to the brain along the _____________
optic nerve
nasal nerve
pulmonary nerve
The retina of the eye has how many specialised cells?
three
four
two
Which specialised cells are found on the outer parts of retina?
cone cells
rod cells
nerve cells
What is the function of rod cells?
to detect colours in bright light.
to detect colours in dim light.
to detect secondary colours.
What is the function of cone cells?
to detect colours in dim light.
to detect secondary colours in dim light.
to detect colours in bright light.
There are ___________ types of cone cells.
three
five
two
What are the three primary colours?
red, purple, yellow
red, green, blue
red, yellow, black
Which colour light is formed when all three primary colours mix?
yellow
purple
white
Which one of the following is true both for human eye and digital camera?
the sensor detects light.
the aperture controls the amount of light that enters.
the lens focuses the light.
Which one of the following is not true for human eye?
the picture that forms on retina is upside down.
the pupil size changes due change in amount of light.
the iris is the transparent part of the eye.
The light energy transferred by sensor into electrical signals is stored on _________________ in a digital camera.
shutter
aperture
memory card
