Assertion (A): Aluminium is the best material for telescopes.

Reason (R): Aluminium is lightweight, strong and rust resistant metal.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R does not explain A.
3. A is true but R is false.
4. A is false but R is true.

You had gone to visit your aunt at Visakhapatnam where you saw large containers being shipped. On enquiring you are told it is an ore of a metal. Which ore is it?

1. Iron
2. Manganese
3. Copper
4. Bauxite

An excess of ……………. in plants and animals is toxic.

1. iron
2. magnetite
3. manganese
4. haematite

…………… is essential for plant growth and reduction of nitrates in green plants.

1. Mica
2. Iron
3. Manganese
4. Copper