Civil Engineering - Concrete Structure

Question - 1

As the cube size increases, the strength of concrete

  • A decreases
  • B remains constant
  • C increases
  • D insufficient data

Question - 2

Tensile strength of concrete is measured by

  • A direct tension test in UniversalTesting Machine (UTM)
  • B applying the compressive load along the diameter of cylinder
  • C applying the third point load on a prism
  • D applying the tensile load along the diameter of cylinder

Question - 3

A concrete cube of 15 cm and a cylinder of 150 mm diameter and 300 mm height are tested for compressive strength, the strength of cube compared to cylinder will be

  • A higher
  • B lower
  • C equal
  • D difficult to assess

Question - 4

The ratio of 7 days and 28 days cube strength is

  • A 0.5
  • B 0.6
  • C 0.75
  • D 0.85

Question - 5

Tensile strength of concrete is approximately of ...................... the compressive strength of concrete.

  • A 3 to 7%
  • B 7 to 15%
  • C 15 to 22%
  • D 22 to 25%

Question - 6

The failure strain of concrete under direct compression and under flexure are respectively

  • A (0.0035, 0.0020)
  • B (0.002, 0.0003)
  • C \((\frac{f_ck}{E_c},\frac{0.7\sqrt{f_{ck}}}{E_c})\)
  • D (0.002, 0.0035)

Question - 7

In MIO nominal mix concrete, if the quantity of water used per 50 kg of cement is 40 kg then that used for M15 concrete for same workability will be

  • A <40kg
  • B =40kg
  • C >40kg
  • D cannot asses

Question - 8

The mean strength of the group of four non-overlapping consecutive cubes, for M30 grade concrete should not be less than

  • A 28.3 MPa
  • B 33.aMPa
  • C 30 MPa
  • D 29.5 MPa

Question - 9

The yield strength of a twisted bar as compared to an ordinary bar (mild steel) is nearly

  • A 50% more
  • B 25% more
  • C 50% less
  • D 25% less

Question - 10

Compare to mild steel plain bars, high strength deformed bars are

  • A less ductile but more strong
  • B more ductile but less strong
  • C more ductile and strong
  • D equally ductile and more strong
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