Estimating and Costing
According to Indian Standards Institute, the actual size of modular bricks is

23 cm x 11.5 cm x 7.5 cm
20 cm x 10 cm x 10 cm
19 cm x 9 cm x 9 cm
25 cm x 13 cm x 7.5 cm

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

The water seal is less than that of ordinary traps
The mica flap valve which opens inwards only, is fitted at the top of the inlet pipe
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

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