Subject :NSO Class : Class 7
Read the following statements regarding waste-water
treatment plant with one or two blanks. Select the
option that correctly completes any two statements.
(i) ________ process allows settling of sand in the
chambers.
(ii) The solid waste called _______settles down and
lighter waste called ________ floats on the surface.
(iii) Secondary treatment involves use of_______.
(iv) ________ and ________ are used in tertiary treatment.
A (ii) sluge, scum;
(iii) chemicals
B (iii) grit removal;
(iv) chlorine, UV rays
C (ii) scum, sludge;
(iii) bacteria
D (i) screening;
(iv) aerobic, anaerobic bacteria
What is the answer for the fourth statement?
Ans 1:
Class : Class 10
CSEDIMENTATIONSCUM.SLUDGE
Ans 2:
Class : Class 8
SLUDGE IS THE SOLID WASTE
Ans 3:
Class : Class 8
good
Ans 4:
Class : Class 10
SCUM,SLUDGE.
Ans 5:
Class : Class 10
Sludge settles down while scum stays up
Ans 6:
Class : Class 8
yeah...sludge settles and scum floats.
Ans 7:
Class : Class 9
chlorine and UV rays are tertiary treatment
Ans 8:
Class : Class 8
Ans 9:
Class : Class 9
Sludge settles while scum floats .you are right