CUET Home Science MCQs Water Safety

Question. What should be the pH of drinking water?
a) Acidic
b) Basic
c) Neutral
d) None of these

Answer: c

Question. Which of the following is a drawback of the stainless steel filter method?
a) It does not kill the coliform bacteria.
b) It does not remove dissolved impurities.
c) It is an expensive method.
d) It consumes a lot of fuel.

Answer: a 

Question. Which type of cloth is used in the simple filtering method?
a) Cotton
b) Muslin
c) Velvet
d) Nylon

Answer: b

Question. Which of the following substances is used in the four pitcher method?
a) Nickel
b) Charcoal
c) Chlorine
d) Alum

Answer: b

Question. In the stainless steel filter, ‘steel’ is made by mixing which of the following?
a) Chrome
b) Nickel
c) Steel
d) All of these

Answer: d

Question. Which of the following is NOT a use of water?
a) Household use
b) Public use
c) Psychological use
d) Industrial use

Answer: c

Question. In which method, a porcelain candle is used?
a) Zero B Filter
b) UV Filter
c) RO Filter
d) Four Pitcher Method

Answer: b

Question. What amount of alum should be dissolved in three litres of water to make it potable?
a) 1 gram
b) 2 grams
c) 3 grams
d) 4 grams

Answer: c

Question. Which of the following is a benefit of chlorine tablets?
a) It is an unreliable method.
b) It kills any coliform bacteria in the water.
c) It removes suspended impurities.
d) It uses filtered water.

Answer: b

Question. In which method, a small size filter is used with a candle?
a) Zero B Filter
b) UV Filter
c) RO Filter
d) Four Pitcher Method

Answer: a

Question. Which of the following is a drawback of boiling?
a) It does not require any special equipment.
b) It destroys carbonic compounds.
c) It destroys micro-organisms.
d) It makes water tasteless.

Answer: d

Question. Which of the following is a benefit of the UV Filter method?
a) Time consuming method
b) Kills bacteria and viruses
c) Removes suspended particles
d) Easiest and cheapest method

Answer: b 

Question. What is a cause of water pollution?
a) Misuse of water resources
b) Mixing toxins in water
c) Using water for cleansing purposes
d) Over use of water in industries

Answer: a

Question. In how much time, the filters in the RO Filter method need to be changed?
a) Every 1 year
b) Every 60 days
c) Every 6 months
d) Every 6 weeks

Answer: c 

Question. In which stage of the RO Filter method, the taste of water is enhanced?
a) First stage
b) Second stage
c) Third stage
d) Fourth stage

Answer: d

Question. What amount of bleaching powder should be added to 200 gallons of water for purification?
a) 30 gms
b) 40 gms
c) 50 gms
d) 60 gms

Answer: d

Question. “This is a double salt of hydrated potassium sulphate and aluminium sulphate.”
Which of the following is being referred to in the above sentence?
a) Chlorine tablets
b) Alum
c) Bleaching powder
d) Charcoal

Answer: b

Question. Given below are two statements labeled as Assertion (A) and Reason (R).
Assertion (A) In the boiling method, water becomes tasteless.
Reason (R) This method leads to the absence of dissolved air in the water.
Select the most appropriate answer from the options given below.
a) BothAandRare trueandRis the correct reasonforA.
b) Both A and R are true but R is not the correct reason for A.
c) A is true and R is false.
d) A is false and R is true.

Answer: a

Question. Given below are two statements labeled as Assertion (A) and Reason (R).
Assertion (A) The bacteria are destroyed when the water comes in contact with polyiodide resin.
Reason (R) Three disc filters restrict dust, sand and impurities from passing through the water.
Select the most appropriate answer from the options given below.
a) Both A and R are true and R is the correct reason for A.
b) Both A and R are true but R is not the correct reason for A.
c) A is true and R is false.
d) A is false and R is true.

Answer: b

Question. Match the following.
Column A                             Column B
(Substance)                     (Method of Purification)
A. Charcoal                         1. Zero B Filter
B. Nickle                             2. Four Pitcher Method
C. Polyiodide resin               3. RO Filter
D. Activated carbon            4. Stainless Steel Filter
Codes
     A B C D
a) 1 2 3 4
b) 2 4 1 3
c) 3 1 4 2
d) 4 3 2 1

Answer: b