railway RRB JE (CBT I + CBT II) Mock Test 2024 People Development & Environment Environmental Issues Pollution
Which of the following are used as disinfectant during water treatment.
A. Chlorine
B. Phosphorous
C. Ozone
D. Nitrogen
E. Ultraviolet Rays
Choose the most appropriate answer from the options given below :
1
A, B, C Only
2
A, B, D Only
3
A, C, E Only
4
B, D, E Only