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51.

The colour of brick depends upon the amount of iron oxide present in the clay.

Correct

Incorrect

52.

Which of the following constituent, when present in excess quantity in clay causes the bricks to melt and distort during burning?

A.	Alumina	B.	Silica
C.	Lime	D.	Alkalies

53.

The alkaline salt present in the bricks, absorbs moisture from the air which on drying

A.	leaves pores and makes the bricks porous	B.	leaves high powder deposit on the brick
C.	makes the bricks brittle and weak	D.	all of these

54.

The standard size of a masonry brick is 20 cm x 10 cm x 10 cm

Agree

Disagree

55.

The size of mould for bricks should be

A.	equal to	B.	smaller than
C.	larger than

56.

Efflorescence is caused if

A.	the alkaline salt is present in the bricks	B.	the clay used for making bricks contain pyrite
C.	the water used for pugging the clay contains gypsum	D.	all of the above

57.

The good clay for making bricks is

A.	unweathered clay	B.	weathered clay
C.	silted soil	D.	black cotton soil

58.

The process of mixing clay, water and other ingredients to make bricks, is known as

A.	tempering	B.	pugging
C.	kneading	D.	moulding

59.

The hand made bricks are

superior

inferior

60.

The bricks after moulding should be dried in

A.	open air	B.	sun for 3 to 8 days
C.	air for 3 to 8 days but not in sun	D.	hot air for 3 days