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.

Explanation

Sewage is mostly water, with about 90% of its content being water.

The remaining 10% consists of organic and inorganic solids, microorganisms, and other impurities.

Explanation

Declination is the angle between the geographic (true) north and magnetic north.

It helps in correcting compass readings for accurate navigation and surveying.

Explanation

A Gunter’s chain is a measuring device used in surveying, traditionally 66 feet long.

It is divided into 100 links, each 0.66 ft, for easy land measurement.

Explanation

Hooke’s law states that within the elastic limit, stress is directly proportional to strain.

It is the fundamental law describing elasticity in materials.

Explanation

A rowlock is a brick laid on its long edge with the short end (header) visible on the wall face.

It is commonly used for wall capping, sills, or decorative features.

Explanation

A metal lath is a steel mesh that provides a strong base for plaster or stucco to adhere to.

It helps in preventing cracks and ensures uniform application of plaster.

Explanation

Strain = Change in length / Original length

= 3 mm / 3000 mm

= 0.003 / 3

= 0.001

Explanation

Moment of force about a point measures the tendency of a force to rotate a body about that point.

It is mathematically the product of force and perpendicular distance from the point, which is called the first moment of area in mechanics.

Explanation

Cavity walls reduce moisture penetration by providing an air gap between two wall layers.

The cavity acts as a barrier to dampness and improves thermal insulation.