If t1=Time at which water is first added to cement, t2=Time when needl – McqOptions

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1.	If t1=Time at which water is first added to cement, t2=Time when needle fails to penetrate 5 mm to 7 mm from bottom of the mould, t3=Time when the needle makes an impression but the attachment fails to do so, then what is final setting time?
A.	t2-t1
B.	t2+t1
C.	t3-t1
D.	2*t1
Answer» D. 2*t1

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