Question65:-Initial and final setting time for ordinary Portland cement is
A:-30 minutes and 600 minutes respectively
B:-60 minutes and 600 minutes respectively
C:-30 minutes and 300 minutes respectively
D:-90 minutes and 600 minutes respectively
Correct Answer:- Option-A
Question66:-Relationship between initial setting time and final setting time is
۵-757 = 90.41.215 कण)
B 2-157 90-1.2(75 ष)
0 :-551 ‏(منم”1.2)153-+60 حزم‎
D2-15T prin =60+1.2(F ST prin)
Correct Answer:- Option-A

Question67:-Which of the following statement is/are correct about setting of cement
(i) setting is hardening of cement

(ii) setting time is the time required for stiffening of cement paste to defined
consistency

(iii) initial setting time is the time when the paste starts losing its plasticity

A:-(i) and (ii) are correct

B:-(i), (ii) and (iii) are correct

C:-(ii) and (iii) are correct

D:-(ii) is incorrect

Correct Answer:- Option-C
Question68:-Match the points :

Type of cement Name of cement
(a) Type IL (i) Portland - slag cement
(b) Type IS (ii) Ternary - blended cement
(c) Type IP (iii) Portland - Lime stone cement
(d) Type IT (iv) Portland - Pozzolana cement

A:-(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
B:-(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
C:-(a)-(ii), (b)-(iv), (¢)-(iii), (d)-(i)
D:-(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
Correct Answer:- Option-B
Question69:-White cement gives walls more adhesive strength due to presence of
A:-Calcium and Aluminium
B:-lron and Aluminium
C:-Aluminium and Magnesium
D:-Iron and Magnesium

Correct Answer:- Option-D