Light — Science STD 7 — Question

Name the spore producing bodies in fern.

Fill in the blanks: The hotness of an object is determined by its __________.

Extraction of metal is a chemical process or physical process?

A burning incense stick is fixed, pointing downwards. In which direction would the smoke from the incense stick move? Show the movement of smoke with a diagram.

Name the two methods by which rusting of iron can be prevented.

Mention which is the most common thing in almost all the clocks.

Name the type of lens which diverges a beam of parallel rays of light.

What happens if the filament breaks?

What is freezing point of water?