A solar eclipse occurs only a
New moon day
No moon day
Full moon day
on day time
Opaque objects casts
a dark shadow
a weak shadow
no shadow
All of these
A tube light is a
hot source
cold source
incandescent source
LED
Which one of the following is not a translucent medium?
Waxed paper
Tracing paper
Black paper
Grounded glass
An example of bioluminescence is
a torch
a burning candle
a table lamp
jugnu
Umbra is a region of
partial darkness
partial brightness
complete brightness
complete darkness
A solar eclipse occurs when the moon casts its shadow on
the sun
the earth
both sun and moon
both sun and earth
Light causes
sensation of heat
sensation of vision
sensation of sound
Sensation of force
Shadow of an object will form only if there is
a source of light
opaque object
a screen
The natural source of light is
Sun
Electric lamp
Candle flame
Kerosene lamp
