Question

1. An eraser can be easily cut by a knife but not a steel nail.
2. We can see through glass but not through a wall.
3. Metals shine but non – metals do not shine.
4. Based on Mohs scale of Hardness, answer the following: -
a) Which mineral is harder than quartz?
b) Which mineral can scratch fluorite?

Answer 1

Answer:

A photocopier enlarges in ratio of 5 :7. if the original document was 30 cm long and 20 cm wide, what are the dimensions of photocopy.

Please guide me proper solution.

Answer 2

Answer:

3. melats are lustrous in nature and thwy ahine

non metals are non lustrous

and metals when rubbed with sand papper

it shines