Important IS Codes

Q. The additional cover thickness to be provided in reinforced concrete members that are totally immersed in seawater is

1. 25 mm
2. 30 mm
3. 35 mm
4. 40 mm

Q. The minimum grade of reinforced concrete in seawater as per IS 456-2000 is

1. M 15
2. M 20
3. M 30
4. M 40

Q. What should be the minimum grade of reinforced concrete in and around sea coast construction?

1. M 35
2. M 30
3. M 25
4. M 20

Q. What is the modular ratio to be used in the analysis of RC beams using working stress method if the grade of concrete is M20 ?

1. 18.6
2. 13.3
3. 9.9
4. 6.5

Q. The final deflection due to all loads including the effects of temperature, creep and shrinkage and measured from as cast level of supports of floors, roofs and all other horizontal members should NOT exceed

1. span/350
2. span/300
3. span/250
4. span/200

Q. Deflection can be controlled by using the appropriate

1. aspect ratio
2. modular ratio
3. span/depth ratio
4. water/cement ratio

Q. What is the pH value of potable water, as specified by $\text{IS 456 : 2000}?$

1. Equal to 7
2. Between 6 and 9
3. Less than 6
4. Not less than 6

Q. The stresses in concrete in a reinforced concrete element under sustained load due to creep

1. increases with time
2. decrease with time
3. remain unchanged
4. fluctuate

Q. In limit state approach, spacing of main reinforcement controls primarily

1. Cracking
2. Deflection
3. Durability
4. Collapse

Q. The final deflection due to all including effects of temperature, creep and shrinkage measured from as-cast level of the supports of floors, roofs and all other horizontal members of reinforced concrete should not normally exceed

1. Span/ 350
2. Span/250
3. (Span/350) or 20 mm whichever is less
4. (5/348) of span

Q. A certain RC structure has to be constructed along a sea coast. The minimum grade of concrete to be used as per $\text{IS 456 : 2000}$ is

1. More than M 20
2. More than M 20 and less than M 30
3. Not less than M 30
4. Less than M 45 and more than M 30

Q. In limit state approach, spacing of main reinforcement controls primarily

1. collapse
2. cracking
3. deflection
4. durability