Design of RC Structures Questions and Answers – Composite Sections Analysis by Elastic Theory – Aggregates

This set of Design of RC Structures Multiple Choice Questions & Answers (MCQs) focuses on “Composite Sections Analysis by Elastic Theory – Aggregates”.

1. What is the major role of aggregate in concrete?
a) It provides strength to the concrete
b) It is the basic component for volume of concrete
c) It acts as binding material
d) It reduces cost

Explanation: Aggregate is the basic component which is used to increase volume of concrete or else concrete will require a high amount of cement.

2. What is the basic size of coarse aggregate?
a) 10mm and 20mm
b) 5mm and 10mm
c) 20mm and 40mm
d) More than 40mm

Explanation: The aggregate whose particles are retained on IS Sieve No. 480 (4.75mm) is termed as coarse aggregate.

3. What are the basic components for the productions for the production of high strength aggregates?
a) Calcium Sulphate
b) Gypsum
c) Granite
d) Magnetite

Explanation: Magnetite, Barites and scrap iron are commonly used for the production of heavy weight aggregates.

4. Write the formula for Aggregate crushing value?
a) B/A * 100
b) A/B * 100
c) 100 – A/B
d) A/b – 100

Explanation: Where A stands for Weight
B stands for passing weight from sieve.

5. What is the fineness modulus for fine aggregates?
a) 1.29
b) 6.685
c) 2.945
d) 1.325

Explanation: Fineness modulus for fine aggregates= 294.5/100= 2.945

6. What is the fineness modulus for coarse aggregates?
a) 6.685
b) 2.945
c) 1.29
d) 1.325

Explanation: Fineness modulus for coarse aggregates= 668.5/100= 6.685

7. Choose the correct formula for bulking factor for aggregate.
a) W1/W2
b) W2/W1
c) W1-W2
d) W2-W1

Explanation: Where W1 stands for weight of 1cum of compacted dry sand
W2 stands for weight of dry sand contained in 1cum of dry loose sand.

8. Which factor affects the workability of concrete?
a) Air
b) Cement
c) Water content
d) Aggregate

Explanation: The water content decreases with decrease in slump and hence to produce durable concrete, water used in concrete should be minimum.

9. Uniform distribution of ingredients of concrete is known as ______
a) Consistency
b) Homogeneity
c) Workability
d) Texture

Explanation: Homogeneity means uniform and stable distribution of ingredients such as sand, cement, aggregates and water and also provides resistance to segregation.

10. Which of the following statement is false?
a) Adding water to a mix reduces compressive strength.
b) Adding water to a mix increase shrinkage
c) Adding water to a mix increases the possibility of segregation.
d) Water doesn’t affect strength of concrete.

Explanation: Water cement ratio is defined as the ratio of weight of water added at the time of mixing to the weight of cement in a mix.

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