Course=rcc .IS 456, STRUCTURAL ENGINEERING. CIVIL ENGG

Subject=rcc IS 456

min. grade of concrete use for RCC work

Optional Answers

(a) M20

(b) M15

(c) M25

(d) M30

(e) M10

(f) none of these

Sollution

(a) M20

min. grade of concrete use for water tank

Optional Answers

(a) M20

(b) M 25

(c) M40

(d) M30

(e) M15

(f) NONE OF THESE

Sollution

(d) M30

IN A RCC SLAB 10MM DIA BAR AT SPACING IS 200, IF WE WILL USE 8 MM BAR THEN SPACING WILL BE

Optional Answers

(a) 200

(b) 220

(c) 240

(d) 250

(e) 280

(f) NONE OF THESE

Sollution

(f) NONE OF THESE

500√Fck is proportional to

Optional Answers

(a) Ec

(b) Fcr

(c) creep

(d) srinkage

Sollution

(a) Ec

0.7√Fck is proportional to

Optional Answers

(a) Ec

(b) Fcr

(c) creep

(d) srinkage

Sollution

(b) Fcr

The maximum area of tension reinforcement in beams shall not exceed in %

Optional Answers

(a) 2

(b) 3

(c) 4

(d) 5

(e) 6

(f) none of these

Sollution

(c) 4

As per I.S. 456 - 1978, the pH value of water shall be

Optional Answers

(a) less than 6

(b) equal to 6

(c) not less than 6

(d) equal to 7

Sollution

(c) not less than 6

The minimum number of main steel bars provided in R.C.C

Optional Answers

(a) rectangular columns is 4

(b) circular columns is 6

(c) octagonal columns is 8

(d) all the above

Sollution

(d) all the above

An R.C.C. column is treated as long if its slenderness ratio is greater than

Optional Answers

(a) 45

(b) 50

(c) 55

(d) 60

(e) 65

(f) 70

Sollution

(b) 50

Cantilever retaining walls can safely be used for a height not more than

Optional Answers

(a) 6

(b) 7

(c) 8

(d) 9

(e) 10

(f) 5

Sollution

(a) 6

min cover for slab in mm

Optional Answers

(a) 15

(b) 25

(c) 40

(d) 75

(e) none of these

Sollution

(a) 15

min cover for beam in mm

Optional Answers

(a) 15

(b) 25

(c) 40

(d) 75

(e) none of these

Sollution

(b) 25

min cover for column in mm

Optional Answers

(a) 20

(b) 30

(c) 40

(d) 50

(e) none of these

Sollution

(c) 40

min cover for footing in mm

Optional Answers

(a) 40

(b) 50

(c) 60

(d) 75

(e) none of these

Sollution

(d) 75

effective length of column when both ends are fixed

Optional Answers

(a) L

(b) 2L

(c) 0.5L

(d) L/√2

(e) none of these

Sollution

(c) 0.5L

The diameter of longitudinal bars of a column should never be less than

Optional Answers

(a) 6

(b) 8

(c) 10

(d) 12

(e) NONE OF THESE

Sollution

(d) 12

Thickened part of a flat slab over its supporting column, is technically known as

Optional Answers

(a) drop panel

(b) capital

(c) column head

(d) none of these

Sollution

(a) drop panel

The effective span of a simply supported slab, is

Optional Answers

(a) distance between the centres of the bearings

(b) clear distance between the inner faces of the walls plus twice the thickness of the wall

(c) clear span plus effective depth of the slab

(d) none of these.

Sollution

(b) clear distance between the inner faces of the walls plus twice the thickness of the wall

The minimum cube strength of concrete used for a prestressed member, is M

Optional Answers

(a) 25

(b) 30

(c) 40

(d) 45

(e) 20

(f) 35

Sollution

(f) 35

A foundation rests on

Optional Answers

(a) base of the foundation

(b) subgrade

(c) foundation soil

(d) both (b) and (c)

Sollution

(d) both (b) and (c)

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