Technical Apti Set No 6

For making lightweight concrete, the gas bubbles are created by adding

• a) Aluminum powder to the slurry

• (b) Air bubbles to the slurry

• (c) Water bubbles to the slurry

• (d) Zinc powder to the slurry

The Metacentre of a floating body, the body will be in stable of equilibrium if

• (a) MG = 0

• (b) M is below G

• (c) BG=0

• (d) M is above G

For a given water-cement ratio, how the size of aggregate affects workability of

concrete?

• A. Larger size of aggregate lower will be workability

• B. Larger size of aggregate higher will be workability

• C. May or may not depend

• D. Does not depend

The slenderness ratio of a vertical Column of square cross-section of 10 Cm side and 500 cm long, is

• (a) 117.2

• (b) 17.3

• (c) 173.2

• (d) 137.2

Water-cement ratio is the ratio of?

• (a) cement to water by weight

• (b) cement to water by volume

• (c) water to cement by volume

• (d) water to cement by weight

The Metacentre of a floating body, the body will be in stable of

equilibrium if

• (a) MG = 0

• (b) M is below G

• (c) BG=0

• (d) M is above G

The materials having same elastic Properties in all directions are called

• (a) Ideal materials

• (b) Uniform materials

• (c) Isotropic materials

• (d) Elastic materials.

Separation of water or water sand cement from a freshly concrete, is known

• (a) Bleeding

• (b) Creeping

• (c) Segregation

• (d) Flooding

Coefficient of velocity is defined as the ratio of

• (a) Actual velocity of jet at vena contracta to the theoretical velocity

• (b) Area of jet at vena contracta to the area of orifice

• (c) Actual discharge through an orifice to the theoretical discharge

• (d) None of the above

If w is the specific weight of liquid and k the depth of any point from the surface, then pressure intensity at that point will be

• (a) h

• (b) wh

• (c) w/h

• (d) h/w