250+ TOP MCQs on Elastic Properties of Aggregates and Answers

Concrete Technology Multiple Choice Questions on “Elastic Properties of Aggregates”.

1. Clay minerals are found in most _________
a) Igneous Environment
b) Sedimentary environment
c) Metamorphic environment
d) In all environment
Answer: b
Clarification: Clay minerals are common in sedimentary formations and seismic measurements are our main tools for studying sub-surface lithology.

2. Theoretical value for bulk modulus of clay __________
a) 20 and 50 GPa
b) 30 and 40 GPa
c) 100-150 GPa
d) 200 GPa
Answer: a
Clarification: Theoretical value for bulk modulus of clay are reported between 20 and 50 GPa.

3. Young’s modulus for dickite is ___________
a) 5.2 GPa
b) 6.2 GPa
c) 7.2 GPa
d) 8.2 GPa
Answer: b
Clarification: Young’s modulus on clay particles using atomic force acoustic microscopy is measured for dickite is 6.2 GPa.

4. The grain density of the clay powders was measured using _______
a) Hydrostatic pressure
b) Cylindrical cavity
c) Pycnometer
d) Helium porosimeter
Answer: c
Clarification: The grain density of the clay powders was measured using a pycnometer.

5. To avoid trapped air produced by clay flocculation, we used ___ in distilled water.
a) (NaPO₃)₆
b) Na₄P₂O₇
c) Na₅P₃O₁₀
d) PO₄
Answer: a
Clarification: To avoid trapped air produced by clay flocculation, we used sodium hexametaphosphate in distilled water.

6. For the cold-pressed aggregate samples, porosity, bulk and grain densities were measured with __________
a) Hydrostatic pressure
b) Cylindrical cavity
c) Pycnometer
d) Helium porosimeter
Answer: d
Clarification: For the cold-pressed aggregate samples, porosity, bulk and grain densities were measured at room P–T conditions with a helium porosimeter.

7. IS 456 of 2000 gives the modulus of elasticity as _______
a) E_c = 5000 fck^.5
b) E_c = 5000 fck²
c) E_c = 5000 fck³
d) E_c = 5000 fck^1/3
Answer: a
Clarification: IS 456 of 2000 gives the modulus of elasticity as Ec = 5000 fck^.5 where E_c is the modulus of elasticity in N/mm².

8. What are elastic strains?
a) These are the instantaneous deformations that occur when an external stress is first applied
b) These deformations occur either on loss of moisture from the concrete on cooling of concrete
c) It is the time-dependent deformation that occurs on the prolonged application of stress
d) Any one or combinations of the above types of deformations in a hardened concrete leads to cracking
Answer: a
Clarification: Elastic strain in concrete, as defined above, depends on the externally applied stress and the modulus of elasticity of concrete.

9. Static modulus of elasticity of concrete has been related to its ________
a) Tensile strength
b) Compressive strength
c) External strength
d) Applied force
Answer: b
Clarification: Static modulus of elasticity of concrete has been related to its compressive strength by the various Standards.

10. If the value of f_ck is 100 then what will be the modulus of elasticity?
a) 5000
b) 500
c) 50000
d) 50
Answer: c
Clarification: The modulus of elasticity as E_c = 5000 fck^.5 =000*100.5 =5000*10 = =50000.