Sun is a ______ source

• luminous

• non luminous

• artificial

• bioluminescence

speed of light in vaccum

• 300000000m/s

• 2500000m/s

• 300m/s

• 30000m/s

Which of the following exhibits bioluminescence?

• Sun

• Moon

• plants

• jelly fish

Light requires a medium to travel.

• True

• false

• May or may not require

• None of these

Which celestial body is a luminous source of light?

• Sun

• Moon

• stars

• comets

What is the phenomenon exhibited by fireflies?

• Bioluminescence

• Photosynthesis

• Chemiluminescence

• Fluorescence

Wood is an example of - ---- material

• transparent

• translucent

• opaque

• None of these

A pinhole camera works on the principle of

• reflection

• rectilinear propagation

• refraction

• none of these

Frosted glass is an example of ______.

• opaque material

• transparent material

• translucent material

• none of these

Which of the following is a cold source of light

• Electric bulb

• Sun

• LED

• None of these