# Practice Test: Question Set - 05

**1. The angle of inclination of the lacing bars with axis of the member is kept between**

- (A) 20° and 50°

- (B) 30° and 60°

- (C) 40° and 70°

- (D) 50°
and 80°

**2. If Δ is the deviation of the individual test strength from the average of**

*n*samples, the standard deviation of concrete of the given grade is- (A) √[ƩΔ

^{2}/(

*n*- 1)]

- (B) √[ƩΔ

^{2}/(

*n*+ 1)]

- (C) √[ƩΔ/(

*n*- 1)]

- (D) √[ƩΔ/(

*n*+ 1)]

**3. The flat slab is a reinforced concrete slab with or without drops and is supported**

- (A) On columns
without column head

- (B) On columns
with column head

- (C) On beams

- (D) None of
these

**4. If the dimensions of a rectangular section of a short column are 15 cm × 20 cm, its unsupported length should be restricted to**

- (A) 9.0 m

- (B) 10.0 m

- (C) 11.0 m

- (D) 12.0 m

**5. Creep of concrete is assumed proportional to the stress if the stress does not exceed _________ of the characteristic compressive strength**

- (A) 15 %

- (B) 20 %

- (C) 25 %

- (D) 33 %

**6. The spans of filler joists supporting a slab may be considered approximately equal if the longest span does not exceed the shortest span more than**

- (A) 5 %

- (B) 10 %

- (C) 15 %

- (D) 20 %

**7. If**

*b*is the width of a beam,*x*is the spacing of the stirrup and*f*is the characteristic strength of stirrups, the minimum cross sectional area of stirrup legs, should be equal or greater than_{c}- (A) 0.2

*bx*/

*f*

_{c}- (B) 0.3

*bx*/

*f*

_{c}- (C) 0.4

*bx*/

*f*

_{c}- (D) 0.5

*bx*/

*f*

_{c}**8. If**

*f*is the characteristic cube strength of concrete in N/mm_{ck}^{2}, the modulus of elasticity of structural concrete*E*=_{c}*a √f*where the value of_{ck}*a*, is- (A) 5900

- (B) 5800

- (C) 5700

- (D) 5600

**9. The average 28 days compressive strength of at least three 15 cm concrete cubes prepared with available water as compared to the average strength of three similar concrete cubes prepared with distilled water, should be at least**

- (A) 70 %

- (B) 80 %

- (C) 90 %

- (D) 95 %

**10. If the slenderness ratio of a column is more than 160, the compressive stress obtained by the secant formula is multiplied by a factor [**

*x*- (1/800*r*)]*in which value of ‘**x*’ is- (A) 0.9

- (B) 1.1

- (C) 1.2

- (D) 1.5

**11.**

*M*30 grade concrete means, its compressive strength of 15-cm cube, is 30 N/mm^{2}after- (A) 3 days

- (B) 7 days

- (C) 21 days

- (D) 28 days

**12. The grade of concrete generally not used in the reinforced concrete, is**

- (A)

*M*10

- (B)

*M*15

- (C)

*M*20

- (D)

*M*40

**13. If**

*a*and*b*are the sides of a square column and its base, the thickness of the base may be calculated from the formula- (A)

*t*= √[3

*W*/

*f*) (

_{bct}*a*

^{2}-

*b*

_{2}/4)]

- (B)

*t*= √[(3

*W*/

*f*)

_{bct}*(a*

^{2}-

*b*

^{2}

*)*]

- (C)

*t*= √[(9

*W*/16

*f*) (

_{bct}*b - a*)

^{2}]

- (D)

*t*= √[(9

*W*/16

*f*) (

_{bct}*a*+

*b*)

^{2}]

**14. For the reinforced concrete member totally immersed in sea water, the normal cover provided for the reinforcing bars is further increased by**

- (A) 10 mm

- (B) 30 mm

- (C) 20 mm

- (D) 40 mm

**15. The tolerances for the form work of columns and beams range from**

- (A) - 3 mm to +
6 mm

- (B) - 4 mm to +
8 mm

- (C) - 6 mm to +
12 mm

- (D) - 8 mm to +
12 mm

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