Explanation

A Darby is a long, straight, stiff tool used to level and smooth wet plaster or concrete surfaces.

It helps achieve a uniform flat surface before finishing.

Explanation

Cast iron is strong in compression but brittle, making it unsuitable for beams or columns under tension.

It is commonly used for water pipes, manholes, and similar applications where compressive strength is sufficient.

Explanation

Calcination is the process of heating gypsum to drive off its water of hydration.

This process converts gypsum into plaster of Paris.

Explanation

1 meter = 3.28084 feet

1 kilometer = 1000 meters

Calculation:

1 kilometer = 1000 × 3.28084

= 3280.84 feet

Explanation

Explanation

Moment of inertia represents a body’s resistance to angular acceleration about an axis.

Greater mass farther from the axis increases the moment of inertia.

Explanation

In the Bessemer process, air is blown through molten pig iron to oxidize and remove impurities.

It was one of the earliest and fastest methods for mass-producing steel.

Explanation

Newton’s law of gravitation states that the force is directly proportional to the product of the two masses.

It is inversely proportional to the square of the distance between their centers.

Explanation

A strap footing uses a cantilever (strap) beam to connect two isolated footings.

It helps balance loads when a column is close to a property line.

Explanation

Acrylic is a transparent plastic widely used for glazing in windows and skylights.

It is lightweight, durable, and offers good clarity with weather resistance.