What happens if mineral oil is present in mixing for concrete?
a) Gives more slump
b) Improves strength
c) Gives a smooth surface
d) Reduces strength
Q.2.
What is wet process?
a) Grinding and mixing of the raw materials in their overheated state
b) Grinding and mixing of the raw materials in their wet state
c) Grinding and mixing of the raw materials in their dry state
d) Grinding and mixing of the raw materials in their medium state
Q.3.
Which of the following increases the workability of concrete?
a) Decreasing size of aggregates
b) Increasing flaky aggregates
c) Increasing size of aggregates
d) Increasing fine aggregates
Q.4.
The form work is usually removed after ________ for walls, columns, and the vertical faces of all structural components.
a) 24 to 48 hours
b) 72 hours
c) 56 hours
d) 24 hours
Q.5.
How is Creep related to the strength of concrete?
a) Directly proportional
b) Inversely proportional
c) Equal
d) Similar
Q.6.
What is equivalent flexural strength?
a) The load value, which represents the average load-carrying capacity in the post-peak region up to a deflection of L/n
b) The value of mean equivalent flexural strength adjusted to mean flexural strength
c) The stress is derived when the peak load value is included in the rupture modulus equation
d) The stress value produced when Pe,n is utilized in the equation of modulus of rupture to represent the average flexural strength in the post-peak zone up to a specific deflection of L/n
Q.7.
Which of the following stress can Plain cement concrete endure?
a) Shear stress
b) Tensile stress
c) Compressive stress
d) Tensile, compressive, and shear stresses
Q.8.
Which of the following is a discontinuity that occurs during the casting of molten metal and is caused by splashing, surging, or interrupted pouring?
a) Flaking
b) Blow hole
c) Cold shut
d) Burst
Q.9.
Which of the following property of a substance that resists abrasion or scratching that causes penetration or indentation?
a) Hardness
b) Stiffness
c) Toughness
d) Strength
Q.10.
Which of the following region absorbs less radiation and transmits more during radiography test for concrete?
a) Low density region
b) Low and high density regions adsorb
c) High density region
d) Low and high density regions absorb and transmit same amount of radiation
Q.11.
Which of the following is not a type of Non-destructive testing?
a) Ultrasonic test
b) Eddy current testing
c) Compression testing
d) Visual testing
Q.12.
For a compressive strength ofpsi, the light weight cement content is ________ pounds per cubic yard.
a) 630-750
b) 440-560
c) 740-840
d) 530-660
Q.13.
What happens when chalk is used?
a) Crushed raw materials are put into a grinding mill, where they are dried and reduced to a fine powder
b) It must be sieved and fed into a rotating dish known as a granulator
c) It must be finely broken up and dispersed in water in a wash mill
d) It must be blasted, then crushed, usually in two smaller crushers
Q.14.
High strength concrete is defined purely on the basis of ____________
a) Tensile strength
b) Compressive strength
c) Good Aggregrates
d) Poor Aggregrates
Q.15.
Which of the following is used to test the Standard consistency of cement?
a) Duff Abrams apparatus
b) Soundness meter
c) Vicat apparatus
d) Le Chatalier apparatus
Q.16.
What are Plasticizers?
a) Which reduces water for workability
b) Which oxidizes water for workability
c) Which decreases workability at the same water content
d) Which adds water for workability
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