Millionaire Mode
Wastewater story - class-V
Question 1 of 77
Study the given differences between primary sludge and activated sludge and select the incorrect ones.
| Primary Sludge | Activated sludge | |
|---|---|---|
| (i) | It is sludge formed during primary sewage treatment. | It is sludge formed during secondary sewage treatment. |
| (ii) | It possesses flocs of decomposer microbes. | It does not possess flocs of decomposer microbes. |
| (iii) | It does not require aeration. | Formation of activated sludge requires aeration. |
| (iv) | A lot of decomposition occurs during formation of primary sludge. | Very little decomposition occurs during formation of activated sludge. |
- (i) and (ii)
- (ii) and (iv)
- only (iv)
- (ii) and (iii)
Prize Money
15₹7 Crores
14₹1 Crore
13₹50,00,000
12₹25,00,000
11₹12,50,000
10₹6,40,000
9₹3,20,000
8₹1,60,000
7₹80,000
6₹40,000
5₹20,000
4₹10,000
3₹5,000
2₹2,000
1₹1,000