Explanation

• In a 1:5 cement mortar ratio, the first number represents cement.
• The second number 5, represents sand.
• So, 1 part cement: 5 parts sand.
• This ratio is commonly used in brick masonry and plastering, depending on specifications.

Last updated by NS on 14-8-2026

Explanation

• Granite is a strong and durable building stone.
• It has high compressive strength.
• It can withstand heavy loads from the bridge structure.
• It is resistant to weathering and abrasion.

Last updated by NS on 14-8-2026

Explanation

• Measured length = 250 m
• Standard chain length = 20 m
• Chain is 10 cm longer = 0.10 m
• Actual chain length = 20 + 0.10 = 20.10 m

Formula:

True Length=Measured Length×Actual Chain Length/Standard Chain Length​

Substitute:

=250×20.10/20

​ $$=250\times 1.005$$

=251.25 m

Last updated by NS on 14-8-2026
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Explanation

Use the formula: (a+b)^2=a^2 +2ab+b^2

(102)^2 =(100+2)^2

=10000+400+4

=10,404

Explanation

• A series of steps is called a staircase, stairway, or a flight of stairs

Additional information:

• Tread: The flat, horizontal top surface where you place your foot.
• Riser: The vertical part that forms the gap between one step and the next.
• Nosing: The front, rounded edge of the tread that sticks out over the riser

Last updated 14 August 2026 by NA

Explanation

• Cast iron pipes are strong and durable.
• They are mainly used for underground water-supply lines.
• They can withstand high water pressure.
• They have a long service life.
• They are suitable for large and permanent water-supply systems

Explanation

• Plain Sedimentation (4–8 hours): Relies purely on gravity for natural particle settling.
• Coagulation-Sedimentation (2–4 hours): Uses chemical coagulants to accelerate particle clumping and settling.
• Detention Time Formula: Calculated as (T =V/Q), dividing tank volume (V) by flow rate (Q) [KETOS].

Explanation

• Montague fall is a type of canal fall.
• It uses a parabolic glacis for energy dissipation.
• The parabolic shape helps control high-velocity flow.
• It converts excess energy and reduces scouring.
• It is used in irrigation canal systems.

Explanation

A fluid flow in which the velocity vector has the same magnitude and direction at every point at any given instant is known as a uniform flow.

Explanation

• A closet is used to store clothes.
• A library is used to store books.
• The analogy shows a storage place and the items stored in it.

Last updated 13 August 2026 by NA