Pick up the incorrect statement from the following:
(A) The degree of grinding of cement, is called fineness
(B) The process of changing cement paste into hard mass, is known as setting of cement
(C) The phenomenon by virtue of which cement does not allow transmission of sound, is known
as soundness of cement
(D) The heat generated during chemical reaction of cement with water, is known as heat of
hydration

1 Answer

Answer :

Answer: Option C

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Last Answer : (B) Consistency test

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Last Answer : Answer: Option C

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Description : For an ordinary Portland cement (A) Residual does not exceed 10% when sieved through IS Sieve No. 9 (B) Soundness varies from 5 to 10 mm (C) Initial setting time is not less than 30 minutes (D) Compressive stress after 7 days, is not less than 175 kg/cm2

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Last Answer : Answer: Option A

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Description : Pick up the incorrect statement from the following: (A) Tricalcium silicate (C3S) hydrates rapidly (B) Tricalcium silicate (C3S) generates more heat of hydration (C) Tricalcium silicate (C3S) develops early strength (D) Tricalcium silicate (C3S) has more resistance to sulphate attack

Last Answer : Answer: Option D

Description : Tricalcium aluminate (C3A) (A) Reacts fast with water (B) Generates less heat of hydration (C) Causes initial setting and early strength of cement (D) Does not contribute to develop ultimate strength

Last Answer : Answer: Option B

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Last Answer : A) Soundness*

Description : Concrete gains strength due to (A) Chemical reaction of cement with sand and coarse aggregates (B) Evaporation of water from concrete (C) Hydration of cement (D) All the above

Last Answer : Answer: Option C

Description : Concrete gains strength due to [ A ] Chemical reaction of cement with sand and coarse aggregates [ B ] Evaporation of water from concrete [ C ] Hydration of cement [ D ] All the above

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Last Answer : Answer: Option D

Description : Portland pozzolana cement possesses (A) Higher resistance to chemical attack (B) Lower heat of hydration (C) Lower shrinkage on drying (D) All the above

Last Answer : Answer: Option D

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Last Answer : (d) All of the above

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Last Answer : (A) Hydration

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Last Answer : Answer: Option D

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Last Answer : Answer: Option B

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Last Answer : Calcium aluminates

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Last Answer : (C) The rate constant for a first order reaction does not change on changing the concentration units

Description : Pick up the incorrect statement applicable to the field test of good cement. (A) When one thrusts one's hand into a bag of cement, one should feel warm (B) The colour of the cement is bluish (C) By rubbing cement in between fingers, one should feed rough (D) All the above

Last Answer : Answer: Option D

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Last Answer : Answer: Option D

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Last Answer : Answer: Option D

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Last Answer : Answer: Option B

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Last Answer : (a) Hydrates the cement rapidly

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Last Answer : [ D ] 65 cal / gm

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Last Answer : (D) All (A), (B) and (C)

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Last Answer : Answer: Option C

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Last Answer : Answer: Option D

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Last Answer : [ C ] Setting

Description : Pick up the correct statement from the following: (A) The lime in excess makes the cement unsound and causes the cement to expand and disintegrate (B) The silica in excess makes the cement stronger ... time also increases (C) The excess amount of alumina weakens the cement (D) All the above

Last Answer : Answer: Option D