WBBSE For Class 9 Physical Science And Environment Solution MCQS

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Solution MCQs

Multiple Choice Type :

Question 1. The ratio of the components of a solution is

  1. Fixed
  2. May vary
  3. May vary to any extent
  4. May vary within a limit

Answer: (4) May vary within a limit

Question 2. Aerated cold drinks contain CO2, sugar, and water. Her solution is of

  1. Sugar
  2. CO2
  3. Water
  4. Sugar and CO2

Answer: (4) Sugar and CO2 etc

Read And Learn More WBBSE Solutions For Class 9 Physical Science And Environment MCQS

Question 3. Which one is the true solution?

  1. Solution of common salt
  2. Solution of chalk
  3. Milk
  4. Butter

Answer: (1) Solution of common salt

Question 4. The particle size of a colloid is

  1. 10-8cm
  2. 10-4 cm
  3. 10-3cm
  4. 10-5 cm−10-7

Answer: (4) 10-5 cm−10-7

WBBSE For Class 9 Physical Science And Environment Solution MCQS

WBBSE Class 9 solutions MCQs with answers

Question 5. Which one of the following will not diffuse?

  1. Suspension
  2. True solution
  3. Colloids
  4. None

Answer: (1) Suspension

Question 6. When liquid is dispersed in a solid, the production is called

  1. Gel
  2. Sol
  3. Emulsion
  4. Foam

Answer: (1) Gel

Question 7. Which of the following in an aqueous solution can enter into the intermolecular space of water?

  1. Urea
  2. Protein
  3. DNA
  4. Starch

Answer: (1) Urea

Solutions multiple choice questions for WBBSE Class 9

Question 8. Solubility of which one of the following increases with an increase in temperature 7

  1. O2
  2. NH3
  3. KNO3
  4. SO2

Answer: (3) KNO3

Question 9. Which one of the following solutions is unstable?

  1. Saturated
  2. Unsaturated
  3. Supersaturated
  4. Colloidal

Answer: (3) Supersaturated

Question 10. Which one of the following solvents is used to remove nail polish?

  1. Ethyl  alcohol
  2. Methyl alcohol
  3. Acetone
  4. Turpentine oil

Answer: (3) Acetone

Question 11. Solution is a

  1. Mixture
  2. Element
  3. Compound
  4.  None of these

Answer: (1) Mixture

Important solution chapter questions for Class 9 Physical Science

Question 12. The solvent of sulphur is

  1. Water
  2. Ethyl alcohol
  3. Carbon disulphide
  4. Benzene

Answer: (3) Carbon disulphide

Question 13. If a saturated solution is heated

  1. Solution becomes unsaturated
  2.  Solution becomes super saturated
  3. Solution remains saturated
  4. All of the above

Answer: (2) Solution becomes super saturated

Question 14. If more solvent is added to a saturated solution 

  1. Solution becomes super saturated
  2.  Solution becomes unsaturated
  3.  Solution remains saturated
  4. All of the above

Answer: (2) Solution becomes unsaturated

Question 15. The solubility of which substance decreases with an increase in temperature?

  1. KNO3
  2.  CaSO4
  3. NaCl
  4. None of these

Answer: (2) CaSO4

WBBSE Class 9 Physical Science MCQs on types of solutions

Question 16. When temperature rises, the solubility of gas in liquid 

  1. Decreases
  2.  Increases
  3. Unaltered
  4. None of these

Answer: (1) Decreases

Question 17. If the size of the particles is between 10-5 cm to 10-7 cm then the solution will be 

  1. True solution
  2.  Suspension
  3. Colloid
  4. None of these

Answer: (3) Colloid

Question 18. The number of water molecules present in washing soda is 

  1.  5
  2.  6
  3. 10
  4.  7

Answer: (3) 10

Question 19. A deliquescent substance is

  1.  Magnesium chloride
  2. Washing soda
  3. Glauber’s salt
  4. Blue vitriol

Answer: (1) Magnesium chloride

Question 20. Fog is

  1.  A solution of liquid in gas
  2. A solution of gas in gas
  3. A solution of solid in gas
  4. A solution of liquid in liquid

Answer: (1) A solution of liquid in gas

Solved MCQs on solutions for WBBSE Class 9

Question 21. Smoke is

  1. A solution of gas in gas
  2. A solution of carbon in gas
  3. A solution of liquid in liquid
  4. A solution of solid in solid

Answer: (4) A solution of carbon in gas

Question 22. Solubility is almost unchanged with rise in temperature in case of 

  1. NaCl
  2. CaSO4
  3. NaSO4  , 10 H2O
  4.  KNO3

Answer: (1) NaCl

Question 23. Phosphorus pentoxide is a

  1. Efflorescent substance
  2. Deliquescent Substance
  3.  Drying agent
  4. None of these

Answer: (3) Drying agent

Question 24. Is soluble in chloroform.

  1. Sugar
  2. Common salt
  3. Oil
  4. Blue vitriol

Answer: (3) Oil

Question 25. lodine is soluble in

  1. Water
  2.  Alcohol
  3.  Acetone
  4. None of these

Answer: (2) Alcohol

Concentration of solutions MCQs Class 9 WBBSE

Question 26. The unit of concentration of the solution is 

  1. g/L
  2. g/m2
  3. g/m
  4. g/cm

Answer: (1) g/L

Question 27. If an excess amount of solute is dissolved in a saturated solution then the solution is Called

  1. Unsaturated solution
  2.  Supersaturated solution
  3. Colloid
  4. Emulsion

Answer: (2) Supersaturated solution

Question 28. A solution is 

  1. Solvent dissolved in solute
  2.  A heterogeneous mixture
  3.  A homogeneous mixture
  4. Only a liquid in liquid

Answer: (3) A homogeneous mixture

Question 29. Depending on “which phase dissolved in which phase”, how many types of solutions do we consider?

  1. 1
  2. 3
  3. 6
  4. 9

Answer: (3) 6

Question 30. A true solution has the feature

  1. Particle size less than 1 mm
  2. Separation by filtration
  3.  Solute particles are large groups of particles
  4. Separation by a semipermeable membrane

Answer: (1) Particle size less than 1 mm

Best multiple choice questions on solutions for WBBSE Class 9

Question 31. A colloidal solution is associated with the feature

  1. Solute particles are large groups of insoluble particles
  2. Particle size is 1 to 100 nm
  3. Separation by filtration
  4. None of these

Answer: (2) Particle size is 1 to 100 nm

Question 32. A suspension is associated with the feature

  1. Solutes are atoms or ions
  2. Particle size is 1 to 100 nm
  3. Particle size is less than 100 nm
  4. Separation by filtration

Answer: (4) Separation by filtration

Question 33. Mist or fog are examples of a colloid where A is dispersed in B. A and B are

  1. Gas-liquid
  2. Liquid – gas
  3. liquid-liquid
  4. Solid-liquid

Answer: (2) liquid – gas

Question 34. Which of the following is not a colloidal solution?

  1.  Icecream
  2. Milk
  3. Smoke
  4. NaCl in water

Answer: (4) NaCl in water

Question 35. Which of the following is not a technical name for colloids?

  1. Foam
  2. Sol
  3. Gel
  4. Olium

Answer: (4) Olium

Question 36. An alloy is a colloid having dispersed and medium as

  1. Liquid in solid
  2. Solid in liquid
  3. Liquid in liquid
  4. Solid in solid

Answer: (4) Solid in solid

WBBSE Class 9 Physical Science solubility and saturation MCQs

Question 37. Soap or detergent is an example of

  1. Emulsifier
  2. Sol
  3. Aerosol
  4. Solid foam

Answer: (1) Emulsifier

 

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