Concrete Technology Questions and Answers – Sampling

This set of Concrete Technology Multiple Choice Questions & Answers (MCQs) focuses on “Sampling”.

1. Loss on Ignition (L.O.I.) is the loss in weight of cement after being heated to ____________
a) 1000°C
b) 100°C
c) 500°C
d) 1500°C
View Answer

Answer: a
Explanation: It indicates the prehydration or carbonation due to prolonged or improper storage of cement & clinker.

2. On cooling below 1250oC, C3S decomposes ____________
a) Fast
b) Slowly
c) Never
d) Depends on the conditions
View Answer

Answer: b
Explanation: On cooling below 1250oC, C3S decomposes slowly but, if cooling is not too slow, C3S remains unchanged and is relatively stable at ordinary temperatures.

3. If the moisture content of 5 to 10% by weight, then the bulking of sand is increased by __________
a) 20
b) 30
c) 40
d) 50
View Answer

Answer: d
Explanation: With the moisture content of 5 to 10% by weight, the bulking of sand is increased by 50.
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4. When sand is fully dry then it’s volume is _________
a) Equal
b) Less
c) More
d) Can’t say
View Answer

Answer: a
Explanation: When the sand is fully dry then there is 0 bulking in it. Therefore, the volume of sand will be same.

5. The mineral oil if present in mixing for concrete ______________
a) Improves strength
b) Reduces strength
c) Gives more slump
d) Gives a smooth surface
View Answer

Answer: a
Explanation: The mineral oil is present in mixing for concrete increases strength for the concentration up to 2%.
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6. To neutralize 200 ml of sample should not require more than 10 ml of __________ normal HCI using methyl orange.
a) 1
b) .1
c) 10
d) .01
View Answer

Answer: b
Explanation: To neutralize 200 ml of water sample the value of 0.1 normal HCI using methyl orange as an indicator should not require more than 10 ml.

7. The loss in weight should not exceed ________ % when tested with Na2SO4 and ________ % with MgSO4 solution.
a) 12, 18
b) 18, 12
c) 10, 15
d) 15, 10
View Answer

Answer: a
Explanation: The loss in weight should not exceed 12 percent when tested with sodium sulphate and 18 percent with magnesium sulphate solution.
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Sanfoundry Global Education & Learning Series – Concrete Technology.

To practice all areas of Concrete Technology, here is complete set of 1000+ Multiple Choice Questions and Answers.

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If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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