Lakhmir Singh and Manjit Kaur Solutions for Chapter: Wastewater Story, Exercise 4: Multiple Choice Questions (MCQs)
Lakhmir Singh Science Solutions for Exercise - Lakhmir Singh and Manjit Kaur Solutions for Chapter: Wastewater Story, Exercise 4: Multiple Choice Questions (MCQs)
Attempt the practice questions on Chapter 18: Wastewater Story, Exercise 4: Multiple Choice Questions (MCQs) with hints and solutions to strengthen your understanding. AWARENESS SCIENCE for Seventh Class solutions are prepared by Experienced Embibe Experts.
Questions from Lakhmir Singh and Manjit Kaur Solutions for Chapter: Wastewater Story, Exercise 4: Multiple Choice Questions (MCQs) with Hints & Solutions
Which of the following statements about ozone are correct?
A. It is essential for breathing of living organisms.
B. It is used to disinfect water.
C. It absorbs ultraviolet rays.
D. Its proportion in air is about .
Which of the following is not an inorganic impurity present in sewage?
Which of the following organisms produce biogas from sludge in the digester tank of a wastewater treatment plant?
Which of the following can be used to disinfect the clean water in a sewage treatment plant before releasing it into the distribution system?
A. Iodine
B. Ozone
C. Oxygen
D. Chlorine
Which of the following is not a water-borne disease?
One of the following types of trees is said to help in purifying wastewater quite rapidly when planted all along with the sewage ponds. These are:
Which of the following are used for the safe disposal of human excreta in those areas where sewerage system does not exist and water supply is limited or not available at all?
Vacuum toilets are usually used in
