CBSE Class 9 Science Exploring Mixtures and Their Separation (Class 9 NCERT New) Quiz 10

1. A separating funnel is used to separate two immiscible liquids based on their different ________.

A densities B boiling points C colors D melting points

2. The transition of a solid directly into a vapour (below its melting point) without passing through the liquid state is called ________.

A sublimation B condensation C melting D evaporation

3. The process when the vapour cools and changes back into a solid without becoming a liquid is called ________.

A deposition B evaporation C condensation D sublimation

4. Centrifugation uses rapid spinning to separate heavier solid particles from a ________ mixture.

A solid-liquid B gas-liquid C solid-gas D liquid-liquid

5. Coagulation involves the addition of a substance, called a ________, to make smaller particles clump together and settle down in a heterogeneous mixture of solids and liquids.

A coagulant B solvent C diluent D reactant

6. The dispersed particles in a colloid or suspension scatter light, which is known as the ________ effect.

A Tyndall B Brownian C Faraday D Raman

7. Which of the following mixtures are correctly classified as homogeneous (Hm) and heterogeneous (Ht)? Choose the correct option.

A (i) Air — Hm, Milk — Ht, Sugar solution — Hm, Smoke — Hm B (ii) Brass — Ht, Fog — Ht, Vinegar — Ht, Muddy water — Hm C (iii) Copper sulfate solution — Hm, Salt solution — Hm, Milk — Hm, Bronze — Hm D (iv) Muddy water — Ht, Milk — Ht, Blood — Ht, Brass — Hm

8. A mixture can be categorised as a solution, a suspension, or a colloid, each possessing distinct properties. Utilise the words or phrases provided in the box to fill in the Table 5.2. Words and phrases may be used more than once. Complete the Table 5.2.

A See Table 5.2 below for answers. B Fill in Table 5.2 using only the properties of solutions. C Complete Table 5.2 using random words from the box. D Use only suspension properties to fill Table 5.2.

9. What is the term for a mixture in which the composition is uniform throughout?

A Heterogeneous mixture B Compound C Homogeneous mixture D Suspension

10. Which separation technique is used to separate a solid from a liquid by passing the mixture through a porous material?

A Distillation B Filtration C Evaporation D Chromatography