Pick up the correct statement from the following: A. Corrugated sheet iron is made by passing plain sheets between grooved rollers B. Strength and stiffness of corrugated sheets are considerably increased C. Corrugated sheets are generally used on slanting roofs D. All the above

The correct answer is D. All the above.

Corrugated sheet iron is made by passing plain sheets between grooved rollers. This process creates a series of parallel ridges and valleys on the surface of the sheet, which increases its strength and stiffness. Corrugated sheets are generally used on slanting roofs because they are able to shed water more effectively than flat sheets.

Here are some additional details about each option:

• Option A: Corrugated sheet iron is made by passing plain sheets between grooved rollers. This process creates a series of parallel ridges and valleys on the surface of the sheet, which increases its strength and stiffness. The ridges and valleys act like beams, which helps to support the weight of the sheet and resist bending.
• Option B: Strength and stiffness of corrugated sheets are considerably increased. The ridges and valleys on a corrugated sheet create a series of parallel beams,
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  to support the weight of the sheet and resist bending. This makes corrugated sheets much stronger and stiffer than flat sheets.
• Option C: Corrugated sheets are generally used on slanting roofs. Corrugated sheets are able to shed water more effectively than flat sheets because the ridges and valleys on the surface of the sheet help to channel water off the roof. This makes corrugated sheets a good choice for roofs that are exposed to a lot of rain or snow.