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Stars
Sun
Moon
Sky
Opaque
Translucent
Transparent
None of these
Earth
Luminous
Visible
Invisible
Both (a) and (b)
Light
Shadow
Reflection
Source of light
Non-luminous
Screen
An opaque object
All of these
About the size of objects
About the shape of objects
About the colour of objects
Longest
Same
Shortest
Refraction
Transparent substances
Straight
Round
Curve
Umbra
Cell
Circuits
Candle
Power station
Electric torch
Electric rod
Electric bell