Is Matter Around Us Pure Test

Is Matter Around Us Pure

This is Is Matter Around Us Pure Test-04 for CBSE class 09 Science.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
22 carrot gold is
  • A
    Pure element
  • B
    Homogenous mixture
    Correct
  • C
    Heterogeneous mixture
  • D
    Pure compound
2
Two miscible liquids A and B are present in solution. The boiling point of A is \({\text{6}}{0^0}{\text{C}}\) and that of B is\({\text{9}}{0^0}{\text{C}}\). Which of the following method is used to separate these two liquids?
  • A
    fractional distillation
    Correct
  • B
    Chromatography
  • C
    distillation
  • D
    Decantation.
3
Which method is applied to separate the colored material from flower petals?
  • A
    Sedimentation followed by decantation.
  • B
    Centrifugation
  • C
    Distillation
  • D
    Chromatography
    Correct
4
\({\text{N}}{{\text{H}}_{\text{4}}}{\text{Cl}}\)is separated from NaCl by which one of the following method.
  • A
    By dissolving in water and evaporation
  • B
    By dissolving the mixture in \({\text{C}}{{\text{S}}_{\text{2}}}\)
  • C
    By moving a magnet through the mixture.
  • D
    By heating the solid mixture in a test tube
    Correct
5
What is the correct order of the methods you apply to separate the components of a mixture of \({\text{N}}{{\text{H}}_{\text{4}}}{\text{Cl}}\), common salt and sand?
  • A
    Moving a magnet, dissolving in water and sublimation.
  • B
    Sublimation, dissolving in water, filtration and evaporation
  • C
    Dissolving in water, evaporation and sublimation
  • D
    Dissolving in water, filtration, evaporation and sublimation.
    Correct
6
What will be the boiling point of water at the top of a mountain where the atmospheric pressure is less than 1 atm?
  • A
    Less than \({\text{1}}{00^0}{\text{C}}\)
    Correct
  • B
    Exactly 373 K
  • C
    More than \({\text{1}}{00^0}{\text{C}}\)
  • D
    \({\text{1}}{00^0}{\text{C}}\)
7
Match the following with correct response. (1) Separation of cream from milk (2) Separation of oil from water (3) Separation of pigment from natural colours (4) Separation of components of air (A) Separating funnel (B) Fractional distillation (C) Centrifugation (D) Centrifugation
  • A
    1-B, 2-D, 3-A, 4-C
  • B
    1-D, 2-A, 3-C, 4-B
    Correct
  • C
    1-A, 2-C, 3-B, 4-D
  • D
    1-C, 2-B, 3-D, 4-A
8
Match the following with correct response. (1) Separation of ammonium chloride from salt (2) Separation of salt from water (3) Separation of sand & iron fillings (4) Separation of benzene & toluene (A) Sublimation (B) Magnetic separation (C) Evaporation (D) Fractional distillation
  • A
    1-A, 2-C, 3-B, 4-D
    Correct
  • B
    1-C, 2-B, 3-D, 4-A
  • C
    1-D, 2-A, 3-C, 4-B
  • D
    1-B, 2-D, 3-A, 4-C
9
Match the following with correct response. (1) Fine mud particles suspended in water (2) Purification of water (3) Small pieces of metal in engine of a car (4) Tea leaves from tea extract (A) Centrifugation (B) Loading & sedimentation (C) Filtration (D) Chlorination
  • A
    1-C, 2-B, 3-D, 4-A
  • B
    1-B, 2-D, 3-A, 4-C
    Correct
  • C
    1-D, 2-A, 3-C, 4-B
  • D
    1-A, 2-C, 3-B, 4-D
10
Statement A: Brass is a solution while gun powder is not Statement B: Air represents a solution in terms of science Which of the two statements is true
  • A
    Statement A
  • B
    Statement B
    Correct
  • C
    Neither Statement A nor Statement B.
  • D
    Both the Statement A and B
11
Find the incorrect statement
  • A
    Purity of compounds can be tested by determining their melting points.
  • B
    No energy changes occur when the constituent of air tried to be mixed.
  • C
    Cesium and gallium are liquids above\({\text{3}}{0^0}{\text{C}}\).
  • D
    Mixture can be called as a single substance
    Correct
12
Which one is physical change?
  • A
    Adding NaCl to water
    Correct
  • B
    Mixing \({\text{N}}{{\text{H}}_{\text{3}}}\)and HCl
  • C
    Mixing \({\text{BaS}}{{\text{O}}_{\text{4}}}\)+ NaCl
  • D
    Burning magnesium in air
13
Which of the following are chemical changes?
  • A
    Melting of ice
  • B
    Cooking of vegetables.
    Correct
  • C
    Freezing of water
  • D
    Drying of wet clothes in sun light
14
What happens on adding dilute HCl to a mixture of iron filling and sulphur powder? A \({H_2}S\) is formed B A colour less and odourless gas is formed C A greenish solution appears D FeS is formed
  • A
    (a) and (b) are correct
  • B
    (b) and (c) are correct
    Correct
  • C
    All of these
  • D
    (a), (b) and (c) are correct
15
Which of the following statement is incorrect A The properties of a compound are different from its constituents elements B A mixture is homogenous but a compound is heterogeneous C Formation of a compound is a chemical change D Formation of a mixture is a chemical change
  • A
    (b) and (d) are correct
    Correct
  • B
    (a), (b) and (c) are correct
  • C
    All of these
  • D
    (a) and (b) are correct