Olympiad – Class VI – Science - Che - Separation of Substances

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Question - 1

'X' is a separation technique based on the difference in weights of the solids in a solid-solid mixture. What is 'X'?

  • A Sieving
  • B Handpicking
  • C Threshing
  • D Winnowing

Question - 2

What type of a substance is steel?

  • A A solid-liquid heterogeneous mixture
  • B A solid - solid heterogeneous mixture
  • C A solid - solid homogeneous mixture
  • D A pure substance

Question - 3

Vinegar is a solution of acetic acid in water. What kind of mixture is vinegar?

  • A A homogeneous mixture of solid and liquid
  • B A heterogeneous mixture of liquid and liquid
  • C A homogeneous mixture of liquid and liquid 
  • D A heterogeneous mixture of solid and liquid

Question - 4

Which of the following separation techniques is used for separating a mixture of two or more gases?

  • A Sedimentation
  • B Liquification
  • C Hand picking 
  • D Decantation

Question - 5

flow chart which gives the techniques a student adopted to separate the constituents of a mixture.

What could the mixture be?

  • A Water + sand + glass
  • B Oxygen + hydrogen + salt
  • C Stones + rice + water
  • D Chalk powder + sugar + water

Question - 6

flow chart which gives the techniques a student adopted to separate the constituents of a mixture.

What could substance R be?

  • A Sugar
  • B Chalk powder
  • C Glass
  • D Oxygen

Question - 7

flow chart which gives the techniques a student adopted to separate the constituents of a mixture.

What is substance Q?

  • A Sugar
  • B Chalk powder
  • C Alcohol
  • D Oxygen

Question - 8

How are grain seeds removed from their stalks?

  • A Sieving
  • B Winnowing
  • C Threshing
  • D All of the above

Question - 9

A compound has

  • A only one kind of mixture.
  • B only one kind of element.
  • C a mixture of elements and molecules.
  • D only one kind of molecules

Question - 10

Identify the mixture from the following.

  • A Oxygen
  • B Carbon dioxide
  • C Hydrogen
  • D Air