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Exercise Question Answers-Chapter 3- The Dynamic Atmosphere and Changing Climate- Class 9-Social Science

  Important Question Answers for the Class 9-Social Science Chapter 3- The Dynamic Atmosphere and Changing Climate ***************************** Very Short Answer Type Questions: 1. Which layer of the atmosphere contains the ozone layer? Answer:   The stratosphere contains the ozone layer. 2. Name the gas that makes up the highest percentage of the atmosphere. Answer:   Nitrogen makes up the highest percentage of the atmosphere. 3. Which element of weather is measured using a barometer? Answer:   A barometer is used to measure atmospheric pressure . 4. What is the normal duration of the southwest monsoon in India? Answer:   The southwest monsoon usually lasts from June to September . 5. Which season in India is known as the “hot weather season”? Answer:   The summer season is known as the hot weather season. 6. Name the process by which water vapour turns into clouds. Answer:   The process is called condensation . 7....
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MCQs-Methods of Separation in Everyday Life-Class 6-Science

Multiple Choice Questions

Methods of Separation in Everyday Life

Class-6
Subject-Science

****************************************

  1. Which method is used to remove pebbles from rice?
    a) Filtration
    b) Handpicking
    c) Decantation
    d) Sieving
    Answer: b) Handpicking

  2. The method of separating grains from stalks by beating is called:
    a) Winnowing
    b) Threshing
    c) Sieving
    d) Filtration
    Answer: b) Threshing

  3. Which of these separation methods uses wind or air?
    a) Handpicking
    b) Winnowing
    c) Sieving
    d) Magnetic separation
    Answer: b) Winnowing

  4. Which process is used to remove husk from wheat using air?
    a) Winnowing
    b) Sedimentation
    c) Sieving
    d) Filtration
    Answer: a) Winnowing

  5. Sieving is used to separate:
    a) Tea leaves from tea
    b) Sand from stones
    c) Salt from saltwater
    d) Cream from milk
    Answer: b) Sand from stones

  6. Which of these is an example of sedimentation?
    a) Sand settling at the bottom of a glass of water
    b) Removing stones from rice
    c) Separating oil from water
    d) Separating salt from seawater
    Answer: a) Sand settling at the bottom of a glass of water

  7. Which method is used to separate tea leaves from tea?
    a) Winnowing
    b) Filtration
    c) Sieving
    d) Magnetic separation
    Answer: b) Filtration

  8. What method is used to obtain salt from seawater?
    a) Sedimentation
    b) Filtration
    c) Evaporation
    d) Sieving
    Answer: c) Evaporation

  9. The process in which heavier components settle at the bottom is called:
    a) Filtration
    b) Decantation
    c) Sedimentation
    d) Winnowing
    Answer: c) Sedimentation

  10. What is decantation used for?
    a) Separating solids from liquids
    b) Separating liquids of different densities
    c) Separating gases
    d) Separating sand from stones
    Answer: b) Separating liquids of different densities

  11. Which method is used to separate butter from buttermilk?
    a) Churning
    b) Winnowing
    c) Handpicking
    d) Filtration
    Answer: a) Churning

  12. Which separation technique is used to separate iron nails from sand?
    a) Filtration
    b) Handpicking
    c) Magnetic separation
    d) Winnowing
    Answer: c) Magnetic separation

  13. Which method is used to separate a mixture of flour and small bran particles?
    a) Sieving
    b) Filtration
    c) Sedimentation
    d) Decantation
    Answer: a) Sieving

  14. Which method is used for separating water and oil?
    a) Filtration
    b) Decantation
    c) Winnowing
    d) Sieving
    Answer: b) Decantation

  15. Which of the following is NOT a method of separation?
    a) Handpicking
    b) Winnowing
    c) Cooking
    d) Filtration
    Answer: c) Cooking

  16. What is the function of a sieve?
    a) To separate solid and liquid
    b) To separate solid particles of different sizes
    c) To dissolve solid in water
    d) To remove gases from liquids
    Answer: b) To separate solid particles of different sizes

  17. Which method is used in washing pulses before cooking?
    a) Filtration
    b) Sedimentation and decantation
    c) Winnowing
    d) Magnetic separation
    Answer: b) Sedimentation and decantation

  18. Which separation method is used in tea bags?
    a) Sedimentation
    b) Filtration
    c) Handpicking
    d) Winnowing
    Answer: b) Filtration

  19. Which of the following is an example of a mixture?
    a) Salt
    b) Water
    c) Sand and salt
    d) Iron
    Answer: c) Sand and salt

  20. Which property is used in winnowing?
    a) Size
    b) Weight
    c) Color
    d) Shape
    Answer: b) Weight

True or False

  1. Filtration can be used to separate salt from water.                                            (False)
  2. Handpicking is useful when the quantity of impurities is small.                      (True)
  3. Magnetic separation is used to remove husk from grains.                                (False)
  4. Sieving is used to separate particles based on size.                                            (True)
  5. Churning is used to separate oil from water.                                                      (False)
  6. Winnowing is useful for separating heavier grains from lighter husk.            (True)
  7. Decantation can be used to separate immiscible liquids like oil and water.    (True)
  8. Sedimentation helps to settle heavier particles in a liquid.                               (True)
  9. Evaporation is used to separate iron filings from sand.                                   (False)
  10. A magnet can be used to separate a mixture of iron and sulfur.                      (True)

Assertion and Reasoning Questions

  1. Assertion (A): Filtration can be used to separate tea leaves from tea.
    Reason (R): A filter allows only the liquid to pass while trapping the tea leaves.
    Answer: (Both A and R are true, and R explains A.)

  2. Assertion (A): Sieving can be used to separate salt from saltwater.
    Reason (R): Sieving is based on particle size differences.
    Answer: (A is false, but R is true.)

  3. Assertion (A): Magnetic separation is used in recycling industries.
    Reason (R): Magnets attract non-magnetic materials.
    Answer: (A is true, but R is false.)

  4. Assertion (A): Winnowing is used to separate grains from husk.
    Reason (R): Lighter husk is carried away by wind, while heavier grains fall straight.
    Answer: (Both A and R are true, and R explains A.)

  5. Assertion (A): Evaporation is the best method to separate sand from water.
    Reason (R): Evaporation removes only dissolved substances.
    Answer: (A is false, but R is true.)

5 Match the Following with Answers:

Column IColumn II
Grains and huskWinnowing
Cream from milkChurning
Salt from seawaterEvaporation
Iron nails and sawdustMagnetic separation
Sand and stonesSieving

********************************************************

To Learn More MCQs Click below: 

Chapter 1- The Wonderful World of Science

Chapter 2- Diversity in the Living World

Chapter 3- Mindful Eating: A Path to a Healthy Body

Chapter 4- Exploring Magnets

Chapter 5- Measurement of Length and Motion

Chapter 6- Materials Around Us

Chapter 7- Temperature and its Measurement

Chapter 8- A Journey through States of Water

Chapter 9- Methods of Separation in Everyday Life

Chapter 10- Living Creatures: Exploring their Characteristics

Chapter 11- Nature’s Treasures

Chapter 12- Beyond Earth

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