Oral Rehydration Solution

Q. Amisha has two solutions labelled 'A' and 'B'. On addition of phenolphthalein to each of them, solution B turns colourless and solution A gives pink colour. What can be determined about the nature of the solutions from the above observations?

1. A- Acid, B- Base
2. A- Base, B- Acid
3. A- Neutral, B- Base
4. A- Neutral, B- Acid

Q.

What is the major source of fresh water in the city/town/village where you live?

Q. Why is water scarcity increasing day by day?

1. Water cycle has stopped functioning.
2. The total amount of water on Earth has decreased.
3. The consumption of water has increased.
4. There is an increasing frequency of floods.

Q.

The rainwater and ________________ from other sources such as rivers and ponds seeps through the ______________ and fills the empty spaces and cracks deep below the ground. The process of seeping of water into the ground is called ______________.

Q. ______ contain fresh water.

1. Oceans
2. Seas
3. Glaciers
4. Sewage

Q. A change in colour or smell of an indicator helps us to distinguish between an acid and a base.

1. False
2. True

Q. Methyl orange turns _____ colour in basic solution.

1. blue
2. yellow
3. pink
4. red

Q. Which of the following is an acid-base indicator?

1. Vinegar
2. Limewater
3. Turmeric
4. Baking Soda

Q. Which of the following substances contain acids?

1. Tomatoes
2. Milk of magnesia
3. Toothpaste
4. Vinegar
5. Lemons
6. Grapes
7. Soap
8. Amla

Q. ______ is stored beneath the surface of the Earth.

1. Seawater
2. Riverwater
3. Groundwater
4. Rainwater

Q. Osmosis is the movement of _____ molecules from a region of higher concentration to a region of lower concentration through a semipermeable membrane.

1. water
2. nitrogen
3. sodium
4. oxygen

Q. Which of the following substances will turn blue litmus red?

1. Shampoo
2. Ketchup
3. Milk
4. Vinegar
5. Toothpaste
6. Orange juice
7. Soap
8. Lemon juice

Q. Which of the following indicator gives pink colour in a basic solution?

1. Methyl orange
2. Turmeric
3. Phenolphthalein
4. Litmus paper