Experiments with Water - 2 Class 5 Worksheet EVS Chapter 7

Q1: Multiple Choice Questions

(i) Gandhi ji marched from ____________to______ to protest against salt law.

(a) Goa to Mumbai
(b) Ahmedabad to Dandi
(c) Gandhinagar to Dandi
(d) Gandhinagar to Ahmedabad
Ans: (b)

(ii) Salt and sugar easily dissolve in water because they are ________in nature.
(a) insoluble
(b) soluble
(c) sparingly soluble
(d) immiscible
Ans: (b)

(iii) A boat floats on water but a needle sinks down, it is due to_________.
(a) density of water
(b) evaporation of water
(c) weight of an object
(d) volume
Ans: (a)

Q2: Fill in the blanks with suitable words:

(i) For making salt, water is allowed to dry in _______.
Ans: sun.

(ii) Dead Sea is the ________ of all.
Ans: saltiest

(iii) Common salt is ______ in water while chalk powder does not dissolve in water.
Ans: soluble

(iv) Iron nail ______ in water but the katori floats.
Ans: sinks

Q3: Match the column

Ans: 

Q4: Answer the following questions

(i) A lemon sinks in a glass of plain water but floats on adding salt in the water. Why?
Ans: A lemon sinks in a glass of plain water but floats on adding salt in the water because water becomes thicker (sense) on adding salt.

(ii) Why does a person float in Dead sea, even after he does not know how to swim?
Ans: A person floats in Dead sea, even after he does not know how to swim because Dead sea is the saltiest of all.

(iii) Suggest some ways to quickly dissolve sugar in water for making shakkarpara.
Ans: Following are two ways to quickly dissolve sugar in water for making shakkarpara:

• Stir the mixture of sugar and water thoroughly.
• Warm the mixture over flame.

(iv) Do you think that the oil gets dissolved in water? Why do you think so?
Ans: No, the oil does not get dissolved in water. Oil always floats on water. This happens because water molecules are more attracted to each other than oil molecules.

(v) Why did Chittibabu and Chinnababu keep their mango jelly in the sun?
Ans: Chittibabu and Chinnababu keep their mango jelly in the sun so that water from jelly could be evaporated.

(vi) Name some things that are made by drying in the sun at your house.
Ans: At my house following things are made by drying in the sun:

• Potato chips
• Papad
• Amla candy
• Moong badi
• Sabudana papad

(vii) How is the salt made?
Ans: The sea water is collected in shallow beds dug in sand. Water is allowed to dry in the sun. Salt remains on the ground after water is dried.

(viii) You have washed your handkerchief and you want to dry it quickly. What all can you do?
Ans: We can do following things to dry our handkerchief quickly:

• Squeeze water out.
• Spread it in sun.
• Dry with hot iron.

(ix) What things do you put in water to make tea? Which of those things dissolved in water?
Ans: We put tea leaves, sugar in water to make tea. Sugar dissolves in water while only the extract of tea leaves comes into water. Rest of the tea is separated out.

(x) You have been given some mishri pieces (lumps of sugar). Suggest some ways to dissolve them quickly?
Ans: Some ways to dissolve mishri quickly in water are as follows:

• Crush mishri pieces into fine powder.
• Stir water continuously
• Warm the water on flame.