NCERT Class 9 MCQ Quiz Hub

1. Which of the following statements are true for pure substances? (i) Pure substances contain only one kind of particles (ii) Pure substances may be compound or mixtures (iii) Pure substances have the same composition throughout (iv) Pure substances can be exemplified by all elements other than nickel
(i) and (ii)
(i) and (iii)
(iii) and (iv)
(ii) and (iii)

2. Rusting of an article made up of iron is called
corrosion and it is a physical as well as chemical change
dissolution and it is a physical change
corrosion and it is a chemical change
dissolution and it is a chemical change

3. A mixture of sulphur and carbon disulphide is
heterogeneous and shows Tyndall effect
homogeneous and shows Tyndall effect
heterogeneous and does not show Tyndall effect
homogeneous and does not show Tyndall effect

4. Tincture of iodine has antiseptic properties. This solution is made by dissolving
iodine in potassium iodide
iodine in vaseline
iodine in water
iodine in alcohol

5. Which of the following are homogeneous in nature? (i) ice (ii) wood (iii) soil (iv) air
(i) and (iii)
(ii) and (iv)
(i) and (iv)
(iii) and (iv)

6. Blood and sea water are
both mixtures
both are compounds
blood is a mixture whereas sea water is a compound
blood is a compound and sea water is a mixture

7. Sol and gel are examples of
Solid-solid colloids
Sol is a solid-liquid colloid and gel is liquid solid colloid
Sol is solid-solid colloid and gel is solid-liquid colloid
Sol is a liquid-solid colloid and gel is a solid-liquid colloid

8. In a water-sugar solution
water is solute and sugar is solvent
water is solvent and sugar is solute
water is solute and water is also solvent
none of these

9. Boron and carbon are
metalloids
metalloid and non-metal respectively
metal
non-metal and metalloid respectively

10. Which of the following are physical changes? (i) Melting of iron metal (ii) Rusting of iron (iii) Bending of an iron rod (iv) Drawing a wire of iron metal
(i), (ii) and (iii)
(i), (ii) and (iv)
(i), (iii) and (iv)
(ii), (iii) and (iv)

11. Which of the following are chemical changes? (i) Decaying of wood (ii) Burning of wood (iii) Sawing of wood (iv) Hammering of a nail into a piece of wood
(i) and (ii)
(ii) and (iii)
(iii) and (iv)
(i) and (iv)

12. Two substances, A and B were made to react to reaction a third substance, A2B according to the following 2 A + B → A2B Which of the following statements concerning this reaction are incorrect? (i) The product A2B shows the properties of substances A and B (ii) The product will always have a fixed composition (iii) The product so formed cannot be classified as a compound (iv) The product so formed is an element
(i), (ii) and (iii)
(ii), (iii) and (iv)
(i), (iii) and (iv)
(ii), (iii) and (iv)

13. Two chemical species X and Y combine together to form a product P which contains both X and Y X + Y → P X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct? (i) P is a compound (ii) X and Y are compounds (iii) X and Y are elements (iv) P has a fixed composition
(i), (ii) and (iii)
(i), (ii) and (iv)
(ii), (iii) and (iv)
(i), (iii) and (iv)

14. Which of the following methods would you use to separate cream from milk?
Fractional distillation
Distillation
Centrifugation
Filtration

15. Cooking of food and digestion of food:
are both physical processes
are both chemical processes
cooking is physical whereas digestion is chemical
cooking is chemical whereas digestion is physical

16. Mercury and bromine are both
liquid at room temperature
solid at room temperature
gases at room temperature
both (a) and (b)