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MCQs

Total Questions : 1012 | Page 98 of 102 pages
Question 971. 8.  ISI has specified full strength of concrete after
  1.    7 days
  2.    14 days
  3.    21 days
  4.    none of these
 Discuss Question
Answer: Option D. -> none of these
Question 972. 7.  Slump test of concrete is a meausre of its
  1.    consistency
  2.    compressive strength
  3.    tensile strength
  4.    impact value
 Discuss Question
Answer: Option A. -> consistency
Question 973. 9.  Strength of concrete with passage of time
  1.    increases
  2.    decreases
  3.    fluctuates
  4.    remains constant
 Discuss Question
Answer: Option A. -> increases
Question 974. 1.  Pick up the correct statement the following:
  1.    Ordinary portland cement is susceptible to the attack of magneisum sulphate
  2.    In set-cement, sulphates reactwiththe free calcium hydroxide to form calcium sulphate
  3.    Solid sulphates do not attck the cement compound
  4.    all the above
 Discuss Question
Answer: Option D. -> all the above
Question 975. 2.  For the preparaton of lowheat cement, the contents of
  1.    C3S and C3A are reduced and content of C2S is increased
  2.    C2S and C3S are reduced and content of C3S is increased
  3.    C3A and C2S are reduced and that of C3S is increased
  4.    C2S, C3S and C3A are reduced
 Discuss Question
Answer: Option A. -> C3S and C3A are reduced and content of C2S is increased
Question 976. 0.  Concrete gains strength due to
  1.    chemical reaction of cement with sand and coarse aggregates
  2.    evaporation of water from concrete
  3.    hydration of cement
  4.    All the above
 Discuss Question
Answer: Option C. -> hydration of cement
Question 977. 4.  Pick up the wrong specification of Vicat apparatus from the following:
  1.    Diameter of Vicat mould-80 mm
  2.    Height of Vicat mould-40 mm
  3.    Diameter of the Vicat plunger -10 mm
  4.    Length of the Vicat plungr-50 mm
 Discuss Question
Answer: Option D. -> Length of the Vicat plungr-50 mm
Question 978. 5.  The initial setting time of ordinary port land cement should be:
  1.    30 minutes
  2.    less than 30 minutes
  3.    more than 30 minutes
  4.    None of the above
 Discuss Question
Answer: Option B. -> less than 30 minutes
Question 979. 3.  Vicat apparatus is not sued for
  1.    normal consistency test of cement
  2.    initial setting time of cement
  3.    final seting time of cement
  4.    compressive strength of cement
 Discuss Question
Answer: Option D. -> compressive strength of cement
Question 980. 6.  The centre needle ofthe attchment of the Vicat plunger projects the circular cutting edge by
  1.    02 mm
  2.    0 5 mm
  3.    1 mm
  4.    5 mm
 Discuss Question
Answer: Option B. -> 0 5 mm

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