The maximum permissible size of aggregates to be used in casting the ribs of a slab, is

কাগজের ভার হিসাবে ব্যবহৃত একটি পুরু কাচ (প্রতিসরাঙ্ক 1.5) খন্ডের উপর থেকে খাড়া নীচের দিকে তাকালে কাগজের উপর একটি দাগ কাচের উপর প্রান্ত থেকে 6 cm নীচে দেখা যায়। কাচ খন্ডতির পুরুত্ব কত? (When you look downward from the top of a thick glass (refractive index 1.5) slab used as a paper weight, a mark on the paper is seen 6 cm below from the top of the slab. What is the thickness of the glass slab?)

A

4 cm

B

6 cm

C

9 cm

D

12 cm

কাগজের ভার হিসাবে ব্যবহৃত একটি পুরু কাচ (প্রতিসরাঙ্ক 1.5) খণ্ডের উপর থেকে খাড়া নীচের দিকে তাকালে কাগজের উপর একটি দাগ কাচের উপর প্রান্ত থেকে 6 cm নীচে দেখা যায়। কাচ খন্ডটির পুরুত্ব কত? (When you look downward from the top of a thick glass (refractive index 1.5) slab used as a paper weight, a mark on the paper is seen 6 cm below from the top of the slab. What is the thickness of the glass slab?)

A

4 cm

B

6 cm

C

9 cm

D

12 cm

If ‘W’ is the load on a circular slab of radius ‘R’, the maximum radial moment at the centre of the slab, is

A

$$\frac{{{\text{W}}{{\text{R}}^2}}}{{16}}$$

B

$$\frac{{2{\text{W}}{{\text{R}}^2}}}{{16}}$$

C

$$\frac{{3{\text{W}}{{\text{R}}^2}}}{{16}}$$

D

$$\frac{{5{\text{W}}{{\text{R}}^2}}}{{16}}$$

If W is the load on a circular slab of radius R, the maximum circumferential moment at the centre of the slab, is

A

$$\frac{{{\text{W}}{{\text{R}}^2}}}{{16}}$$

B

$$\frac{{2{\text{W}}{{\text{R}}^2}}}{{16}}$$

C

$$\frac{{3{\text{W}}{{\text{R}}^2}}}{{16}}$$

D

Zero

If the maximum bending moment of a simply supported slab is M Kg.cm, the effective depth of the slab is (where Q is M.R. factor)

A

$$\frac{{\text{M}}}{{100{\text{Q}}}}$$

B

$$\frac{{\text{M}}}{{10\sqrt {\text{Q}} }}$$

C

$$\sqrt {\frac{{\text{M}}}{{\text{Q}}}} $$

D

$$\sqrt {\frac{{\text{M}}}{{100{\text{Q}}}}} $$

If the main reinforcement of the slab is parallel to a T-beam, the transverse reinforcement at mid span of the slab is provided at least __________ of main reinforcement.

A

40%

B

50%

C

60%

D

70%

An R.C.C. roof slab is designed as a two way slab if

A

It supports live loads in both directions

B

The ratio of spans in two directions is less than 2

C

The slab is continuous over two supports

D

The slab is discontinuous at edges

When shear stress exceeds the permissible limit in a slab, then it is reduced by

A

Increasing the depth

B

Providing shear reinforcement

C

Using high strength steel

D

Using thinner bars but more in number

For heavily reinforced concrete member, the nominal maximum size of the aggregates should be restricted to

A

5 mm less than the minimum clear distance between the main bars

B

5 mm less than the minimum cover to the reinforcement

C

Smaller of A and B

D

Greater of A and B

Ribs are used for strengthening and stiffening the liner plate for tunnels of diameter greater than

A

2 m

B

3 m

C

4 m

D

5 m

The maximum permissible size of aggregates to be used in casting the ribs of a slab, is

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