RCC MCQs Practice Set-2

Page 1 of 5

1.

Why is the design of a RCC section as over-reinforced section is undesirable?

It consume more concrete

It undergoes high strains

It fails suddenly

It has a heavy section

2.

A doubly RCC beam is recommended when

the depth of the beam is restricted

the breadth of the beam is restricted

both breadth and depth is restricted

shear is very high

3.

In a single reinforced beam, if the permissible stress in concrete reaches earlier than the permissible stress in steel, the beam section is called

Under reinforced section

economic section

critical section

over reinforced section

4.

In singly reinforced beams, steel reinforcements is provided in

tensile zone

compression zone

both tensile and compressive zones

neutral zones

5.

In a singly reinforcement beam, the effective depth is measured from the compression edge to the

tensile edge

center of tensile reinforcement

neutral axis of the beam

none of these

6.

The working stress method of design of RC members is known as

non-deterministic approach

deterministic approach

probabilistic

none of these

7.

According to IS 456, the modulus of elasticity of steel can be assumed as

200 KN/mm²

225 KN/mm²

250 KN/mm²

300 KN/mm²

8.

According to IS: 456-1978, modulus of elasticity of concrete E_c [ in N/mm² ] can be taken as

E_c = 5700√f_ck

E_c = 570√f_ck

E_c = 5700f_ck

E_c = 700√f_ck

9.

As compared to working stress method of design, limit state method takes concrete to

a higher stress level

a lower stress level

the same stress level

sometimes higher but generally lower stress level

10.

Factor of safety for

steel should be based on its yield stress

concrete should be based on its ultimate stress

both

none of these

Page 2 of 5

11.

In a singly reinforced concrete beam, as the load increases

only concrete will resist tension

only steel bars will resist tension

both concrete and steel will resist tension

both concrete and steel will resist compression

12.

Lateral ties in RC column are provided to resist

bending moment

shear

buckling of longitudinal steel bars

both bending moment and shear

13.

For an over-reinforced (singly reinforced) rectangular reinforced concrete section

The lever arm will be less than that for a balanced section

The maximum stress developed by steel will be equal to the allowable stress in steel

The maximum stress developed by concrete will be equal to allowable stress in concrete

None of these

14.

The maximum shear stress in a rectangular beam is__________________times of average shear stress.

1.15

1.25

1.50

1.75

15.

Which one of the following sections of equal cross-sectional area can resist the torsional moment of a RCC beam section more efficiently when working stress design is adopted?

An unsymmetrical section

A box section

A solid rectangular section

A symmetrical I-section

16.

In a doubly reinforced beam, steel reinforcement is provided in a

a) Tensile zone

b) Compression zone

Either a) or b)

Both (a) and (b)

17.

A doubly reinforced section is used

When the members are subjected to alternate external loads and the bending moment in the sections reverses

When the members are subjected to loading eccentric on either side of the axis

When the members are subjected to accidental lateral loads

All of these

18.

In a doubly reinforced rectangular beam, the allowable stress in compression steel is ________________the permissible stress in tension in steel.

Equal to

Less than

Greater than

Zero

19.

A long column is one whose ratio of effective length to its least lateral dimension exceeds

5

10

12

20

20.

A doubly reinforced beam is considered less economical than a singly reinforced beam because

Shear reinforcement is more

Compressive steel is under-stressed

Tensile steel required is more than that for balanced section

Concrete is not stressed to its full value

Page 3 of 5

21.

In a doubly reinforced concrete section, the presence of steel bars in compression zone_____________________the depth of the neutral axis.

Effects

Does not effect

Less effected

None of these

22.

If the area of tensile steel reinforced is doubled, the moment of resistance of the beam increases only by about

12%

22%

32%

42%

23.

In the steel beam theory of doubly reinforced concrete beams, it is assumed that

Compression steel resists the compression

Stress in compression steel is equal to stress in tension steel

In tension and compression concrete, no stress is developed

All of these

24.

Bond strength between steel and concrete is affected by

a) Friction

b) Adhesion

c) Both (a) and (b)

d) None of these

25.

Bond strength between steel reinforcement and concrete is affected by

Steel properties

Concrete properties

Both

None of these

26.

In a RC column, the spacing of longitudinal bars measured along the periphery of column should not exceed

250 mm

200 mm

350 mm

300 mm

27.

For a longitudinal reinforcing bar in a column, the cover should not be less than

10 mm

20 mm

30 mm

40 mm

28.

The purpose of lateral ties in short reinforced concrete columns is to

facilitate construction

Facilitate compaction of concrete

Avoid buckling of longitudinal bars

None of these

29.

While designing a reinforced concrete pole as a column, it is considered as

Fixed at both ends

Hinged at both ends

Fixed at one end and hinged at the other end

None of these

30.

When the steel bars are embedded in concrete, the concrete after setting, adhere to the surface of the bars and thus resist any force that tends to pull or push this rod. The intensity of the adhesive force is called

Bond stress

Shear stress

Compressive stress

None of these

Page 4 of 5

31.

The longitudinal shearing stresses acting on the surface between the steel and concrete are called

Bond stresses

Tensile stresses

Compressive stresses

All of these

32.

The bond between steel and concrete is mainly due to

Pure adhesive resistance

Frictional resistance

Mechanical resistance

All of these

33.

The term 'bond' is used to describe the means by which_________________between steel and concrete is prevented.

Resistance

Crack

Slip

Capacitance

34.

When the ratio of effective length of the column to its least lateral dimension does not exceed 12, it is termed as a

Long column

Short column

Plain column

None of these

35.

If the bond stress developed in a reinforced concrete beam is more than permissible value, it can be brought down by

Increasing the depth of beam

Increasing the number of bars

Decreasing the diameter of the bars

All of these

36.

The diameter of bars for main reinforcement in slabs, may vary from

2 to 4 mm

4 to 8 mm

8 to 14 mm

14 to 18 mm

37.

The pitch of bars of main reinforcement in solid slab should not exceed_______________the effective depth of slab or 60 cm whichever is smaller.

Double

Three times

Five times

Six times

38.

The diameter of bars used for distribution reinforcement in slabs, may vary from

2 to 4 mm

4 to 6 mm

6 to 8 mm

8 to 12 mm

39.

In a simply supported slab, the pitch of distribution reinforcement should not be more than______________________the effective depth of slab of 60 cm whichever is smaller.

Double

Three times

Five times

Six times

40.

In a simply supported slab, alternate bars are curtailed at

One-fifth of the span

One-sixth of the span

One-seventh of the span

One-eighth of the span

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41.

When a slab is continuous over several spans, negative (i.e. hogging) bending moment is induced over the

End supports

Intermediate supports

Both (a) and (b)

None of these

42.

When the slab is supported on all the four edges and the ratio of long span to short span is small, bending takes place along both the spans. Such a slab is known as a

Slab spanning in one direction

One-way slab

Slab spanning in two direction

Two-way slab

43.

For a slab spanning in two directions, the ratio of span to the depth of slab should not exceed

10

20

35

50

44.

The part of a slab around the column, which is of greater thickness than the rest of the slab is known as a

Column head

Panel

Capital

Drop

45.

The column head of flat slab

increases rigidity of the slab and column connection

decreases resistance of the slab of shear

increases the effective span of the slab

All of these

RCC MCQs Practice Set-2

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