Teaching UGC NET Mock Test Series 2025 (Paper 1 & 2) People Development & Environment Environmental Issues Pollution
Which of the following is true about hard water?
A. Hardness in water can occur in both surface and underground waters.
B. Hardness increases the cleaning efficiency of water.
C. It is caused by carbonates of magnesium and calcium.
D. Hard water is considered as safe for human consumption.
E. Hard water causes scaling in water distribution systems.
Choose the correct answer from the options given below:
1
A, C, D and E only
2
A, C and E only
3
B, C, D and E only
4
A, B, D and E only