D15 CHECK YOUR LEVEL

The difference in elevation of the top of bank and full supply level of a canal is called

• Critical depth
• Berm
• Freeboard
• Storage depth

Answer explanation

Freeboard is the vertical distance between the top of the bank and the full supply level of a canal.

The road connecting district headquarters of a state is

• Bypass road
• District road
• State highway
• National highway

Answer explanation

State highways link important cities and district HQs and connect them with national highways.

The payment unit for RCC work is

• 10 m³
• dm³
• m³
• 10 dm³

Answer explanation

RCC work is paid in units of 10 dm³ as per standard data books.

Modulus of rigidity is given by the ratio of

• Tensile stress to Tensile strain
• Stress to Strain
• Shear stress to Shear strain
• Compressive stress to Compressive strain

Answer explanation

Modulus of rigidity (G) = Shear stress / Shear strain.

While falling, drops of water acquire spherical shape on account of

• Adhesion
• Cohesion
• Surface tension
• Viscosity

Answer explanation

Surface tension causes liquid drops to acquire the least surface area, forming a sphere.

Two vectors are equal if they have

• Same dimension
• Same magnitude
• Same dimension, magnitude and direction
• Same directions

Answer explanation

Vectors are equal only when they have same magnitude and direction.

The science which deals with origin, properties, distribution, and circulation of the water in the earth is called

• Hydrometry
• Hydrography
• Hydrology
• Geography

Answer explanation

Hydrology is the science dealing with the occurrence, distribution, and movement of water on Earth.

The permissible compressive strength in M20 grade concrete in N/mm² is

• 4
• 5
• 7
• 6

Answer explanation

M20 grade concrete has a permissible compressive strength of 7 N/mm².

The area of cross section of trapezoidal section of formation width 'B', central depth ‘d’ and side slope S is

• Bd + Sd²
• Bd - Sd²
• B x d
• ½ (B + d)

Answer explanation

Area of trapezoid = Bd + Sd², where S is side slope and d is depth.

If the perimeter of a circular ground is 31.416 m then the area of the ground is

• 783.4 m²
• 78540 m²
• 78.54 m²
• 7.854 m²

Answer explanation

Diameter = 10 m, Area = π/4 × d² = 78.54 m².