ISRO Technician-B Plumber Question Paper - 2017 (Set - 1) with Answer Key

DI pipe

Copper pipe

PVC pipe

Lead pipe

30 cm to 45 cm

20 cm to 30 cm

35 cm to 50 cm

40 cm to 30 cm

40 cm

60 cm

100 cm

80 cm

To remove the dissolved gases

To remove the unpleasant and objectionable testes and colors from the water

To eliminate the tuberculation and corrosive properties

All of these

Sand

Sand and gravel

Sand and Cement

Lime