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Q: Which harmful substances in brick earth do not allow the clay to be mixed thoroughly, spoil the appearance of the brick and it may crack while working?
  • A. Alkalis
  • B. Iron pyrites
  • C. Lime
  • D. Pebbles, gravels and grits
Correct Answer: Option D - Harmful substances in brick earth– Pebbles, gravels, grits do not allow the clay to be mixed thoroughly and these are spoil the appearance of the bricks. • Bricks with pebbles may crack while working.
D. Harmful substances in brick earth– Pebbles, gravels, grits do not allow the clay to be mixed thoroughly and these are spoil the appearance of the bricks. • Bricks with pebbles may crack while working.

Explanations:

Harmful substances in brick earth– Pebbles, gravels, grits do not allow the clay to be mixed thoroughly and these are spoil the appearance of the bricks. • Bricks with pebbles may crack while working.