# Concrete Technology Questions and Answers – Mechanical Properties of Aggregates

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

1. What is A in the following figure?

c) Permanent strain unrecovered
d) Resilient strain recovered

Explanation: According to Highway Construction and Maintenance, they prepared a graph of aggregates for stress vs strain in which stress is increasing wrt strain at first i.e. loading.

2. What is B in the following figure?

c) Permanent strain unrecovered
d) Resilient strain recovered

Explanation: According to Highway Construction and Maintenance, they prepared a graph of aggregates for stress vs strain in which stress is decreasing wrt strain after a period of time i.e. unloading.

3. From the graph below, what is C?

c) Permanent strain unrecovered
d) Resilient strain recovered

Explanation: According to Highway Construction and Maintenance, they prepared a graph of aggregates for stress vs strain in which they came to a conclusion C is Permanent strain unrecovered.

4. From the graph below, what is D?

c) Permanent strain unrecovered
d) Resilient strain recovered

Explanation: According to Highway Construction and Maintenance, they prepared a graph of aggregates for stress vs strain, where D is resilient strain recovered.

5. A maximum value of ___ percent is allowed for WBM base course in Indian conditions.
a) 25
b) 35
c) 40
d) 50

Explanation: A maximum value of 40%age is allowed for WBM base course in Indian conditions.
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6. Aggregates to be used for wearing course, the impact value shouldn’t exceed __________ percent.
a) 30
b) 35
c) 40
d) 25

Explanation: Aggregates to be used for wearing course, the impact value shouldn’t exceed 30 %. For bituminous macadam the maximum permissible value is 35 %.

7. The loss in weight should not exceed _________ percent when tested with sodium sulphate and _________ percent with magnesium sulphate solution.
a) 12, 18
b) 18, 12
c) 10, 15
d) 15, 10

Explanation: The loss in weight should not exceed 12 percent when tested with sodium sulphate and 18 percent with magnesium sulphate solution.

Sanfoundry Global Education & Learning Series – Concrete Technology.

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