61. Assertion A : Pure lime takes a long time to develop adequate strength.
Reason R : Pure lime has slow hardening characteristics.
Select your answer according to the coding system given below :
a) Both A and R are true and R is correct explanation of A.
b) Both A and R are true and R is not a correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.
Ans: a
62. Hydraulic lime is obtained by
a) burning of lime stone
b) burning of kankar
c) adding water to quick lime
d) calcination of pure clay
Ans: b
63. The main constituent which imparts hydraulicity to hydraulic lime is
a) calcium oxide
b) silica
c) clay
d) water
Ans: c
64. Study the following statements.
i) Hydraulic lime is suitable for white washing,
ii) Fat lime is suitable for whitewashing,
iii) Hydraulic lime is suitable for making mortar,
iv) Fat lime is suitable for making mortar.
The correct answer is
a) (i) and (iv)
b) (ii) and (iii)
c) (i) and (ii)
d) (iii) and (iv)
Ans: b
65. The main ingredients of Portland cement are
a) lime and silica
b) lime and alumina
c) silica and alumina
d) lime and iron
Ans: a
66. The constituent of cement which is responsible for all the undesirable properties of cement is
a) dicalcium silicate
b) tricalcium silicate
c) tricalcium aluminate
d) tetra calcium alumino ferrite
Ans: c
67. Le Chatelier's device is used for determining the
a) setting time of cement
b) soundness of cement
c) tensile strength of cement
d) compressive strength of cement
Ans: b
68. The main constituent of cement which is responsible for initial setting of cement is
a) dicalcium silicate
b) tricalcium silicate
c) tricalcium aluminate
d) all of the above
Ans: c
69. The initial setting time for ordinary Portland cement as per IS specifications should not be less than
a) 10 minutes
b) 30 minutes
c) 60 minutes
d) 600 minutes
Ans: b
70. As per IS specifications, the maximum final setting time for ordinary Portland cement should be
a) 30 minutes
b) 1 hour
c) 6 hours
d) 10 hours
Ans: d
Reason R : Pure lime has slow hardening characteristics.
Select your answer according to the coding system given below :
a) Both A and R are true and R is correct explanation of A.
b) Both A and R are true and R is not a correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.
Ans: a
62. Hydraulic lime is obtained by
a) burning of lime stone
b) burning of kankar
c) adding water to quick lime
d) calcination of pure clay
Ans: b
63. The main constituent which imparts hydraulicity to hydraulic lime is
a) calcium oxide
b) silica
c) clay
d) water
Ans: c
64. Study the following statements.
i) Hydraulic lime is suitable for white washing,
ii) Fat lime is suitable for whitewashing,
iii) Hydraulic lime is suitable for making mortar,
iv) Fat lime is suitable for making mortar.
The correct answer is
a) (i) and (iv)
b) (ii) and (iii)
c) (i) and (ii)
d) (iii) and (iv)
Ans: b
65. The main ingredients of Portland cement are
a) lime and silica
b) lime and alumina
c) silica and alumina
d) lime and iron
Ans: a
66. The constituent of cement which is responsible for all the undesirable properties of cement is
a) dicalcium silicate
b) tricalcium silicate
c) tricalcium aluminate
d) tetra calcium alumino ferrite
Ans: c
67. Le Chatelier's device is used for determining the
a) setting time of cement
b) soundness of cement
c) tensile strength of cement
d) compressive strength of cement
Ans: b
68. The main constituent of cement which is responsible for initial setting of cement is
a) dicalcium silicate
b) tricalcium silicate
c) tricalcium aluminate
d) all of the above
Ans: c
69. The initial setting time for ordinary Portland cement as per IS specifications should not be less than
a) 10 minutes
b) 30 minutes
c) 60 minutes
d) 600 minutes
Ans: b
70. As per IS specifications, the maximum final setting time for ordinary Portland cement should be
a) 30 minutes
b) 1 hour
c) 6 hours
d) 10 hours
Ans: d
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