Online Test of Chapter 3 Metals and Non-Metals Test 1 Science| Class 10th

1. The metal with lowest density is
(a) sodium.
(b) potassium.
(c) lithium.
(d) caesium.

2. Which of the following pairs will give displacement reactions?
(a) NaCl solution and copper metal
(b) MgCI₂ solution and aluminium metal
(c) FeSO₄ solution and silver metal
(d) AgNO₃ solution and copper metal

3. An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be:
(a) Calcium
(b) Carbon
(c) Silicon
(d) Iron

4. Purification of silicon for use in semiconductors is carried out by
(a) Heating under vacuum
(b) Froth floatation
(c) Liquation
(d) Zone refining

5. Identify the correct order of reactivity of metals among the following.
(a) Cu < Fe < Zn < Al < Na
(b) Fe < Zn < Cu < Na < Al
(c) Zn < Cu < Fe < Al < Na
(d) Cu < Zn < Al < Na < Fe

6. An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be
(a) Calcium
(b) Carbon
(c) Silicon
(d) Iron

7. An additional substance added during smelting, which reacts with impurities to form a fusible product is called
(a) Flux
(b) Slag
(c) Gangue
(d) Mud

8. In the thermite process, the reducing agent used is
(a) Calcium
(b) Sodium
(c) Coke
(d) Aluminium powder

9. Which of the following are the ingredients of gun metal?
(a) Iron, Tin
(b) Copper, Tin
(c) Iron, Brass, Tin
(d) Iron, Zinc, Titanium

10. Which of the following methods is suitable in preventing an iron frying pan from rusting?
(a) Applying grease
(b) Applying paint
(c) Applying a coating of zinc
(d) All of the above.