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MCQs For Class 9 Science
Chapter 2 : Is Matter Around Us Pure
MCQs For Class 9 Science Chapter 2 Is Matter Around Us Pure
Q1. Which of the following is a pure substance?
A. Milk
B. Air
C. Water
D. Brick
Correct Answer: C
Q2. A mixture of salt and sugar is an example of:
A. Homogeneous mixture
B. Heterogeneous mixture
C. Pure substance
D. Compound
Correct Answer: B
Q3. Brass is an alloy of:
A. Copper and Tin
B. Copper and Zinc
C. Zinc and Iron
D. Copper and Aluminium
Correct Answer: B
Q4. The component of a solution that is present in larger quantity is called:
A. Solute
B. Solvent
C. Saturated solution
D. Precipitate
Correct Answer: B
Q5. Tincture of iodine has antiseptic properties. This solution is made by dissolving:
A. Iodine in potassium iodide
B. Iodine in acetone
C. Iodine in water
D. Iodine in alcohol
Correct Answer: D
Q6. Which of the following is a homogeneous mixture?
A. Soda water
B. Wood
C. Soil
D. Oil in water
Correct Answer: A
Q7. A solution that has dissolved as much solute as it is capable of dissolving at a given temperature is:
A. Unsaturated solution
B. Saturated solution
C. Super-saturated solution
D. Dilute solution
Correct Answer: B
Q8. Which of the following shows the Tyndall effect?
A. Salt solution
B. Sugar solution
C. Milk
D. Copper sulphate solution
Correct Answer: C
Q9. The particles of a suspension:
A. Are too small to see
B. Pass through filter paper
C. Can be seen by naked eyes
D. Are stable
Correct Answer: C
Q10. Which technique is used to separate cream from milk?
A. Evaporation
B. Distillation
C. Centrifugation
D. Filtration
Correct Answer: C
Q11. Two immiscible liquids can be separated by using:
A. Fractional distillation
B. Filter paper
C. Separating funnel
D. Sublimation
Correct Answer: C
Q12. The process used to separate a mixture of Ammonium chloride and Salt is:
A. Evaporation
B. Chromatography
C. Sublimation
D. Centrifugation
Correct Answer: C
Q13. Which of the following is used to separate pigments from natural colors?
A. Distillation
B. Chromatography
C. Crystallization
D. Filtration
Correct Answer: B
Q14. For separating two miscible liquids with a boiling point difference of less than 25 K, we use:
A. Simple distillation
B. Fractional distillation
C. Separating funnel
D. Sublimation
Correct Answer: B
Q15. Different gases from air are separated by:
A. Filtration
B. Simple distillation
C. Fractional distillation
D. Crystallization
Correct Answer: C
Q16. Which method is better for purifying solids like Copper Sulphate?
A. Evaporation
B. Crystallization
C. Distillation
D. Centrifugation
Correct Answer: B
Q17. Which of the following is a chemical change?
A. Melting of ice
B. Boiling of water
C. Rusting of iron
D. Cutting of trees
Correct Answer: C
Q18. Burning of a candle is:
A. Only physical change
B. Only chemical change
C. Both physical and chemical change
D. Neither physical nor chemical change
Correct Answer: C
Q19. Who was the first scientist to use the term 'Element'?
A. Robert Boyle
B. Antoine Laurent Lavoisier
C. Isaac Newton
D. John Dalton
Correct Answer: A
Q20. Which of the following is a liquid metal at room temperature?
A. Sodium
B. Potassium
C. Mercury
D. Bromine
Correct Answer: C
Q21. Which of the following is a liquid non-metal at room temperature?
A. Mercury
B. Bromine
C. Chlorine
D. Phosphorus
Correct Answer: B
Q22. Metalloids are elements that:
A. Show only properties of metals
B. Show only properties of non-metals
C. Show intermediate properties of metals and non-metals
D. Are always gases
Correct Answer: C
Q23. A substance made up of two or more elements chemically combined in a fixed ratio is a:
A. Mixture
B. Compound
C. Solution
D. Suspension
Correct Answer: B
Q24. In a mixture, the constituents:
A. Lose their properties
B. Retain their properties
C. Form a new substance
D. Are always in a fixed ratio
Correct Answer: B
Q25. Air is considered a mixture because:
A. Its composition can vary
B. It shows properties of its constituent gases
C. It can be separated by physical methods (fractional distillation)
D. All of the above
Correct Answer: D
Q26. Which of the following will result in a true solution?
A. Chalk powder in water
B. Sand in water
C. Sugar in water
D. Starch in water
Correct Answer: C
Q27. The size of particles in a solution is less than:
A. 1 nm
B. 10 nm
C. 100 nm
D. 1000 nm
Correct Answer: A
Q28. What is the concentration of a solution that contains 40g of salt in 320g of water?
A. 10%
B. 11.1%
C. 12.5%
D. 15%
Correct Answer: B
Q29. Fog, clouds, and mist are examples of:
A. Aerosol
B. Foam
C. Sol
D. Gel
Correct Answer: A
Q30. Jelly and shaving cream are:
A. Solutions
B. Suspensions
C. Colloids
D. Elements
Correct Answer: C
Q31. Which of the following is NOT a property of a colloid?
A. It is a heterogeneous mixture
B. It shows Tyndall effect
C. Particles settle down when left undisturbed
D. Particles cannot be separated by filtration
Correct Answer: C
Q32. Cooking of food and digestion of food are:
A. Physical changes
B. Chemical changes
C. No changes
D. Reversible changes
Correct Answer: B
Q33. Which of the following are metalloids?
A. Boron
B. Silicon
C. Germanium
D. All of the above
Correct Answer: D
Q34. Solubility of a solute in a solvent ________ with an increase in temperature.
A. Decreases
B. Increases
C. Remains same
D. Stops
Correct Answer: B
Q35. A mixture of sulfur and iron filings can be separated by:
A. Sublimation
B. Using a magnet
C. Filtration
D. Distillation
Correct Answer: B
Q36. The "disperse phase" and "dispersion medium" are terms related to:
A. True Solutions
B. Suspensions
C. Colloids
D. Compounds
Correct Answer: C
Q37. Which of the following is a property of non-metals?
A. Malleability
B. Ductility
C. Poor conductors of heat and electricity
D. Lustrous appearance
Correct Answer: C
Q38. When iron and sulfur are heated together, they form:
A. A mixture
B. A compound (Iron Sulphide)
C. An element
D. A solution
Correct Answer: B
Q39. Which of the following is a pure substance made of only one kind of atom?
A. Compound
B. Element
C. Mixture
D. Solution
Correct Answer: B
Q40. Chalk powder in water is an example of:
A. Solution
B. Colloid
C. Suspension
D. Saturated solution
Correct Answer: C
Q41. Crystallization is a process that:
A. Separates a pure solid from a solution in the form of crystals
B. Changes liquid to gas
C. Changes solid to gas
D. Separates immiscible liquids
Correct Answer: A
Q42. Which of the following statement is FALSE?
A. A mixture has no fixed melting point
B. A compound has a fixed melting point
C. Elements are pure substances
D. Milk is a pure substance
Correct Answer: D
Q43. The technique of Chromatography is based on:
A. Difference in boiling points
B. Difference in solubilities in the same solvent
C. Difference in densities
D. Difference in melting points
Correct Answer: B
Q44. To separate a mixture of Acetone and Water, we use:
A. Separating funnel
B. Simple distillation
C. Filtration
D. Crystallization
Correct Answer: B
Q45. Carbon is a:
A. Metal
B. Non-metal
C. Metalloid
D. Alloy
Correct Answer: B
Q46. The scattering of light by colloidal particles is known as:
A. Reflection
B. Refraction
C. Tyndall Effect
D. Diffraction
Correct Answer: C
Q47. Which of the following is an example of a solid-in-solid colloid?
A. Milk
B. Gemstones / Milky glass
C. Butter
D. Smoke
Correct Answer: B
Q48. Chemical properties of a compound are:
A. Same as its constituent elements
B. Entirely different from its constituent elements
C. Constant only for metals
D. Non-existent
Correct Answer: B
Q49. Mass by mass percentage of a solution is calculated as:
A. (Mass of solute / Mass of solution) × 100
B. (Mass of solvent / Mass of solute) × 100
C. (Mass of solution / Mass of solute) × 100
D. (Mass of solute / Mass of solvent) × 100
Correct Answer: A
Q50. Which of the following cannot be broken down into simpler substances by chemical reactions?
A. Water
B. Sugar
C. Salt
D. Gold
Correct Answer: D