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51.

Alumina in the cement lowers the clinkering temperature.

Agree

Disagree

52.

After the final grinding, the cement is sieved through IS sieve number

A.	9	B.	12
C.	24	D.	48

53.

The change of state of cement paste from fluid to solid is called hardening.

Right

Wrong

54.

Efflorescence in cement is caused due to the excess of

A.	silica	B.	lime
C.	alkalies	D.	iron oxide

55.

The presence of tricalcium silicate in cement

A.	hydrates the cement rapidly	B.	generates less heat of hydration
C.	offers high resistance to sulphate attack	D.	all of these

56.

The presence of dicalcium silicate in cement

A.	hydrates the cement slowly	B.	generates less heat of hydration
C.	has more resistance to sulphate attack	D.	all of these

57.

The tricalcium aluminate in cement has the property of

A.	reacting fast with water	B.	causing initial setting of cement
C.	generating large amount of heat hydration	D.	all of these

58.

The tetra calcium alumino ferrite in cement has

good

poor

59.

High percentage of tricalcium silicate and low percentage of dicalcium silicate in cement results in

A.	rapid hardening	B.	high erly strength
C.	high heat generation	D.	none of these

60.

The first compound which reacts with water when mixed with cement is tricalcium aluminate.

Correct

Incorrect