## Marks 1

Let the characteristic strength be defined as that value, below which not more than 50% of the
results are expected to fall. Assuming a standard devia...

Workability of concrete can be measured using slump, compaction factor and Vee bee time.
Consider the following statements for workability of concrete...

Consider the following statements for air-entrained concrete:
(i) Air-entrainment reduces the water demand for a given level of workability
(ii) Use o...

The flexural tensile strength of M25 grade of concrete, in N/mm2, as per IS:456-2000 is
__________.

The target mean strength fcm for concrete mix design obtained from the characteristic strength
(fck) and standard deviation $$\sigma$$, as defined in ...

The modulus of elasticity, E = 5000$$\sqrt{{\mathrm f}_\mathrm{ck}}$$ where fck is the characteristic compressive strength
of concrete, specified in I...

Maximum possible value of compaction factor for fresh (green) concrete is

The cross-section of a thermo-mechanically treated (TMT) reinforcing bar has

For limit state of collapse, the partial safety factors recommended by
IS 456:2000 for estimating the design strength of concrete and reinforcing stee...

A reinforced concrete structure has to be constructed along a sea coast. The
minimum grade of concrete to be used as per IS: 456-2000 is

Consider the following statements:
1. The compressive strength of concrete decreases with increase in water-cement
ratio of the concrete mix.
2. Water...

The flexural strength of M30 concrete as per IS: 456-2000 is

The partial factor of safety for concrete as per IS: 456-2000 is

Modulus of elasticity of M25 grade concrete in MPa is

The permissible tensile stress in concrete made of M 25 concrete is

The cylinder strength of the concrete is less than the cube strength because of

Workability of concrete is influenced most by its

Grading of aggregate in a concrete mix is necessary to achieve

The factored loads at the limit state of collapse for DL + LL, DL + WL, and DL + LL + WL combinations, according to IS: 456 - 2000 are respectively

Setting time of cement sample is tested by

Tensile strength of cement mortar is usually found by:

The modulus of elasticity of concrete mix M25 is

## Marks 2

According to the concept of Limit State Design as per IS 456: 2000, the probability of failure of a
structure is __________.

The composition of an air-entrained concrete is given below:
Water : 184 kg /m3
Ordinary Portland Cement(OPC) : 368 kg /m3
Sand : 606 kg /m3
Coarse a...

Consider a reinforcing bar embedded in concrete. In a marine environment this bar undergoes
uniform corrosion, which leads to deposition of corrosion ...

Un-factored maximum bending moments at a section of a reinforced concrete
beam resulting from a frame analysis are 50, 80, 120 and 180 kN-m under dead...

Consider the following statements:
I. Modulus of elasticity concrete increases with increase in compressive
strength of concrete.
II. Brittleness of c...