Composition of Good Brick Earth MCQ

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• Loamy, mild or sandy clay has __________ percentage of alkali?
  ক

  5%

  খ

  1%

  গ

  4%

  ঘ

  0%
• How many types of the brick earth are there?
  ক

  3

  খ

  5

  গ

  2

  ঘ

  6
• Carbonaceous material in small amounts is good for the brick earth.
  ক

  True

  খ

  False
• The presence of which of the below renders clay totally unsuitable for brick manufacture?
  ক

  Kallar

  খ

  Kankar

  গ

  Hay

  ঘ

  Lime
• Which of the following leads to the formation of small pores in brick?
  ক

  Iron pyrites

  খ

  Pebbles

  গ

  Organic matter

  ঘ

  Alkalis
• Why do bricks become brittle when excess silica is present?
  ক

  Pores are created

  খ

  Flaking occurs

  গ

  Thermal stability is lost

  ঘ

  Cohesion is lost
• What is the harmful effect of presents of alkali in brick earth on bricks?
  ক

  Discolourises bricks

  খ

  Efflorescence

  গ

  Porous bricks

  ঘ

  Flaking
• What happens to raw bricks if an excess of alumina is present?
  ক

  Becomes hard

  খ

  Becomes brittle

  গ

  Decay

  ঘ

  Shrinkage
• Excess of oxides of iron makes the brick:
  ক

  Red in colour

  খ

  Black in colour

  গ

  Dark blue in colour

  ঘ

  Yellow in colour
• In what form should lime be present in the brick earth?
  ক

  Paste

  খ

  Lump

  গ

  Clinker

  ঘ

  Powder
• Which one of the below is the most important ingredient in the brick earth?
  ক

  Alumina

  খ

  Lime

  গ

  Silica

  ঘ

  Magnesia
• How many constituents are there in the brick earth?
  ক

  5

  খ

  4

  গ

  6

  ঘ

  8