1. The clouds float in the atmosphere because of low:

(a) temperature

(b) velocity

(c) pressure

(d) density

2. Pi consists of how many digits?

a) 9 digits

b) 10 digits

c) 12 digits

d) Infinite

3. Given below are two statements, one labelled as Assertion (A) and other labelled as Reason (R)

Assertion (A): A diamond sparkles more than a glass imitation cut to the same shape.

Reason (R): The refractive index of diamond is less than that of glass.

In context of the above two statements, which one of the following is correct ?

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true and R is not a correct explanation of A

(c) A is true but R is false

(d) A is false but R is true

4. An air bubble in water will act like a:
(a) convex mirror
(b) convex lens
(c) concave mirror
(d) cancave lens

5. When a mirror is rotated by an angle 0, the reflected ray will rotate by:
(a) 0°
(b) 0/2
(c) 0
(d) 20

6. Which of the following statement is true about ionic compounds?

Ionic compounds conduct electricity when dissolved in water.
Ionic compounds are not soluble in water.
Ionic compounds are crystalline solids.
Correct options are:

a) Both 1 and 3

b) Both 1 and 2

c) Both 2 and 3

d) All the three

7. The solution of one of the following compounds will conduct electricity. This compound is:

a) CCl4

b) HCl

c) CaCl2

d) CH3Cl

8. What is an ionic bond?

a) Ionic bond is formed by sharing of electrons between two atoms.

b) It is a bond formed by the transfer of electrons from one atom to another.

c) Both A and B are correct

d) None of the above

9. What is C12H12O11 also known as:

a) Sand

b) Sugar

c) Salt

d) Clay

10. The only non-metal which is liquid at room temperature is:

a) Mercury

b) Bromine

c) Chlorine

d) Gallium

11. Choose the one which is different or odd from the following.

a) Aluminum

b) Iron

c) Copper

d) Brass

12. Name the ions present in Sodium Oxide compound?

a) Sodium ions

b) Oxide ions

c) Both A and B

d) Neither A nor B

13. Which of the following are electrovalent compounds?

a) Copper sulphate

b) Calcium nitrate

c) Magnesium oxide

d) All of the above

14. What is the electronic configuration of calcium ion (Ca2+):

a) 2,8

b) 2,8,2

c) 2,8,4

d) 2,8,8

15. Name the salt when on dissolving in water give an acidic solution?

a) Potassium Chloride

b) Ammonium Chloride

c) Sodium Carbonate

d) Sodium Acetate

16. Bleaching powder is formed by treating chlorine with…….

a) Calcium Hydroxide

b) Potassium Hydrogen carbonate

c) Magnesium Hydroxide

d) None of the above

17. Name the salt whose aqueous solution will turn blue litmus to red?

a) Sodium Acetate

b) Potassium Sulphate

c) Potassium Carbonate

d) Ammonium Sulphate

18. Name an acid which contains both oxygen and hydrogen?

a) Oxy acid

b) Hydra acid

c) Dilute acid

d) Concentrated acid

19. What is the chemical name of Baking Soda?

a) Potassium Carbonate

b) Potassium Hydrogen Carbonate

c) Sodium Hydrogen Carbonate

d) Sodium Carbonate

20. What is battery acid?

a) It is sulphuric acid diluted with water.

b) It is carboxylic acid mixed with water.

c) It is concentrated hydrochloric acid.

d) It is concentrated sulphuric acid.