Maharashtra Board Class 4 Evs Water Safe for Drinking

Last updated on April 24th, 2024 at 04:38 am

 

Q: What is the significance of microorganisms in our lives?
A: Microorganisms have great importance as they play various roles, such as converting milk into yogurt. However, some microorganisms can cause diseases when they enter our bodies.

 

Q: What is the process called when heavier particles settle to the bottom of still water?
A: The process is called settling.

 

Q: How can you separate tea leaves from tea?
A: Tea leaves can be separated from tea by filtration.

 

Q: Why do some substances float on water while others sink?
A: Substances that are less dense than water float, while those that are denser sink.

 

Q: What is the purpose of ORS (Oral Rehydration Solution)?
A: ORS is used to rehydrate individuals who are experiencing loose motions or dehydration by replenishing lost electrolytes.

 

Q: Why is it important to obtain safe drinking water?
A: Safe drinking water is essential to prevent illnesses caused by harmful microorganisms or contaminants present in water.

 

Multiple choice questions from the chapter

1. A) What substances are commonly used to make lemon sherbet?

1. A) Salt and sugar
2. B) Lemon juice and oil
3. C) Lemon juice, sugar, and water
4. D) Milk and honey

        Answer: C) Lemon juice, sugar, and water

 

1. B) Why may water that looks clean not be fit for drinking?

1. A) It is too cold
2. B) It contains harmful microorganisms
3. C) It has a transparent appearance
4. D) It has a pleasant smell

        Answer: B) It contains harmful microorganisms

 

1. C) How can sugar dissolve quickly when making sherbet?

1. A) Boiling the mixture
2. B) Freezing the mixture
3. C) Stirring or shaking the mixture
4. D) Adding more sugar

        Answer: C) Stirring or shaking the mixture

 

1. D) What happens to oil when placed in water?

1. A) It sinks
2. B) It floats
3. C) It dissolves
4. D) It evaporates

        Answer: B) It floats

 

1. E) What is added to muddy water to help clean it?

1. A) Sugar
2. B) Salt
3. C) Alum
4. D) Lemon juice

        Answer: C) Alum

 

1. F) What does ORS stand for?

1. A) Oxygen Replenishment System
2. B) Oral Rehydration Solution
3. C) Organic Residue Separator
4. D) Oxygenated Respiratory System

        Answer: B) Oral Rehydration Solution