Question Paper
Class / Subject: Class 9 (CBSE) · Science
Chapter: Chapter 2 — Chapter 2: Is Matter Around Us Pure?
Time Allowed: 15 minutes
Max Marks: 6
1. A mixture of salt and water is: [1]
(A) a mixture
(B) a pure substance
(C) an element
(D) a compound
2. Pure substances have: [1]
(A) a fixed melting/boiling point
(B) a range of melting points always
(C) no melting point
(D) variable composition
3. A mixture with visibly separate layers, like oil and water, is: [1]
(A) heterogeneous
(B) homogeneous
(C) a pure substance
(D) an element
4. Chromatography is used to separate: [1]
(A) mixtures with different solubility properties
(B) elements only
(C) isotopes only
(D) gases only
5. Fractional distillation is used to separate liquids with: [1]
(A) close boiling points
(B) very different densities only
(C) different colours only
(D) the same boiling point
6. A technique that separates a solid that turns directly into gas is called: [1]
(A) sublimation
(B) filtration
(C) chromatography
(D) crystallisation