Estimating and Costing
Pick up the incorrect statement regarding a master trap from the following:

It is provided a cleaning eye at the top of the trap
It is provided in between the lower end of the house drain and the street sewer
The mica flap valve which opens inwards only, is fitted at the top of the inlet pipe
The water seal is less than that of ordinary traps

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Estimating and Costing
Pick up the correct statement in case of water supply.

Pipes are classified according to their sizes and quality
Cutting through walls and floors are included with the item
Pipes laid in trenches and pipes fixed to walls are measured separately
All of these

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Estimating and Costing
The correct Prismoidal formula for volume is

D/3 [first area + last area + 2 Ʃ Even area + 4 Ʃ odd areas]
D [first area + last area + Ʃ Even area + 2 Ʃ odd areas]
D/6 [first area + last area + 2 ∑ Even area + 4 ∑ odd areas]
D/3 [first area + last area + 4 Ʃ Even area + 2 Ʃ odd areas]

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