Explanation

Buoys are floating navigation aids used to mark channels, hazards, and important points for ships.

They help in safe navigation by indicating positions and directions in water.

Explanation

This formula is used in limit state design including dead load (D), live load (L), and lateral earth pressure (H).

The factors 1.4 and 1.7 are load factors applied to account for safety and variability in loads.

Explanation

Ebonite is a hard, durable form of rubber used as an insulating material for electric wires.

It provides electrical insulation and protects wires from mechanical damage.

Explanation

Zinc oxide is commonly used as a corrosion-resistant pigment in paints.

It protects metal surfaces by forming a protective layer against moisture and oxidation.

Explanation

In double-headed rails, the head and foot are of equal dimensions, designed to be inverted when the top wears out.

Flat-footed and bull-headed rails have different head and foot dimensions.

Explanation

Crazing is the formation of fine cracks on the surface of paint.

It usually occurs due to aging, improper drying, or incompatible paint layers.

Explanation

The centroid of a right-angled triangle lies 1/3 the base from the right angle along the base.

It divides the median in a 2:1 ratio from the vertex to the midpoint of the opposite side.

Explanation

Explanation

Centering is the temporary framework used to support arches, domes, or other roof structures during construction.

It holds the structure in place until it becomes self-supporting.

Explanation

Straight stairs provide the easiest and most direct path, making them comfortable to use.

They are simple to construct and safe, with uniform steps and no tight turns.