Experiment with water 100

Class VI Science: Experiments with Water

Part 1: Questions from Page 61

1. Would a puffed puri sink or float in a bowl of water? (a) Sink (b) Float (c) Dissolve (d) Break

b) Float: A puffed puri has air inside, making it less dense than water (page 61).

2. Would a steel plate sink or float on water? (a) Sink (b) Float (c) Dissolve (d) Stay still

a) Sink: Steel is denser than water (page 61).

3. Would a steel spoon sink or float on water? (a) Sink (b) Float (c) Dissolve (d) Break

a) Sink: Like the steel plate, a spoon is denser than water (page 61).

4. Would the cap of a plastic bottle sink or float on water? (a) Sink (b) Float (c) Dissolve (d) Stay still

b) Float: Plastic caps are less dense than water (page 61).

5. True or False: A puri that does not puff up floats in oil.

False: A non-puffed puri sinks in oil, as it lacks trapped air (page 61).

6. Why did Ayesha’s dough ball sink in water?

The dough is dense and lacks air, making it heavier than water (page 61).

7. What happens to a puri when it is first put in hot oil?

It sinks to the bottom before puffing up and floating (page 61).

8. Match: Puffed puri – (a) Sinks in water (b) Floats in water (c) Dissolves in water (d) Breaks in water.

b) Floats in water (page 61).

9. Why does a puffed puri float in oil?

Air trapped inside makes it less dense than oil (page 61).

10. True or False: All puris float in water regardless of puffing.

False: Only puffed puris float due to trapped air (page 61).

Part 2: Additional Questions (Pages 61–67)

11. What does a soap case do in water? (a) Sinks (b) Floats (c) Dissolves (d) Breaks

b) Floats: The soap case is less dense than water (page 62).

12. Does a wooden boat float or sink? (a) Sink (b) Float (c) Dissolve (d) Break

b) Float: Wood is less dense than water (page 62).

13. Why does an iron nail sink in water? (a) It’s light (b) It’s dense (c) It’s hollow (d) It’s wooden

b) It’s dense: Iron is heavier than water (page 63).

14. What happens to a lemon in salty water? (a) Sinks (b) Floats (c) Dissolves (d) Breaks

b) Floats: Salty water is denser, allowing the lemon to float (page 64).

15. How much salt is in one litre of Dead Sea water? (a) 100g (b) 200g (c) 300g (d) 400g

c) 300g (page 64).

16. Does sugar dissolve in water? (a) Yes (b) No (c) Partially (d) Only when heated

a) Yes: Sugar dissolves completely (page 64).

17. True or False: Oil dissolves in water.

False: Oil forms droplets and does not dissolve (page 65).

18. What happened to water left boiling on the stove? (a) It froze (b) It evaporated (c) It sank (d) It dissolved

b) It evaporated: Water turned to vapor (page 65).

19. Why was salt taxed by the British? (a) To control trade (b) To limit use (c) To raise money (d) To clean water

c) To raise money (page 66).

20. How is salt made from seawater? (a) Boiling (b) Freezing (c) Sun-drying (d) Filtering

c) Sun-drying: Water evaporates, leaving salt (page 66).

21. What happens to an empty katori in water? (a) Sinks (b) Floats (c) Dissolves (d) Breaks

b) Floats: An empty katori traps air, making it less dense (page 63).

22. What happens to aluminium foil when spread out? (a) Sinks (b) Floats (c) Dissolves (d) Breaks

b) Floats: Spread foil traps air (page 63).

23. What happens to aluminium foil when balled up? (a) Sinks (b) Floats (c) Dissolves (d) Breaks

a) Sinks: Compacted foil is denser (page 63).

24. Does chalk powder dissolve in water? (a) Yes (b) No (c) Partially (d) Only when heated

b) No: Chalk settles at the bottom (page 65).

25. Does milk dissolve in water? (a) Yes (b) No (c) Mixes but doesn’t dissolve (d) Sinks

c) Mixes but doesn’t dissolve: Milk disperses but retains particles (page 65).

26. Why did eggs float in salty water? (a) They dissolved (b) Water became denser (c) Eggs became lighter (d) Water evaporated

b) Water became denser: Salt increases water density (page 64).

27. What is the saltiest sea? (a) Red Sea (b) Dead Sea (c) Black Sea (d) Caspian Sea

b) Dead Sea (page 64).

28. Can a non-swimmer float in the Dead Sea? (a) Yes (b) No (c) Only with help (d) Only if light

a) Yes: High salt content makes water very dense (page 64).

29. What did Gandhiji protest in 1930? (a) Water tax (b) Salt tax (c) Food tax (d) Land tax

b) Salt tax (page 66).

30. Where did Gandhiji’s Dandi March start? (a) Delhi (b) Mumbai (c) Ahmedabad (d) Kolkata

c) Ahmedabad (page 66).

31. What year was the Dandi March? (a) 1920 (b) 1930 (c) 1940 (d) 1950

b) 1930 (page 66).

32. What is mishri? (a) Salt lumps (b) Sugar lumps (c) Flour lumps (d) Oil drops

b) Sugar lumps (page 66).

33. How can sugar dissolve faster in water? (a) Cool the water (b) Stir it (c) Add oil (d) Add soil

b) Stir it: Stirring speeds up dissolution (page 64).

34. What happens to soil in water? (a) Dissolves (b) Floats (c) Sinks (d) Evaporates

c) Sinks: Soil particles settle at the bottom (page 65).

35. Why was mango jelly kept in the sun? (a) To dissolve it (b) To dry it (c) To cool it (d) To cook it

b) To dry it: Sun removes water content (page 65).

36. What is one item dried in the sun at home? (a) Sugar (b) Papad (c) Oil (d) Chalk

b) Papad: Commonly dried in the sun (page 65).

37. What can you do to dry a handkerchief quickly? (a) Soak it (b) Hang it in the sun (c) Put it in water (d) Freeze it

b) Hang it in the sun: Sunlight evaporates water (page 66).

38. What dissolves in water to make tea? (a) Tea leaves (b) Sugar (c) Milk (d) Spices

b) Sugar: It dissolves completely (page 66).

39. Does a needle float or sink in water? (a) Float (b) Sink (c) Dissolve (d) Break

b) Sink: A needle is denser than water (page 62).

40. Why does an iron ship float? (a) It’s light (b) It’s hollow (c) It’s dense (d) It’s small

b) It’s hollow: Air inside reduces its density (page 62).

41. What happens to shakkarpara sugar in water? (a) Sinks (b) Floats (c) Dissolves (d) Breaks

c) Dissolves: Sugar dissolves in water (page 64).

42. What is the taste of Dead Sea water? (a) Sweet (b) Bitter (c) Sour (d) Tasteless

b) Bitter: Due to high salt content (page 64).

43. What did Ayesha drop in the water? (a) Spoon (b) Soap (c) Puri (d) Plate

b) Soap (page 61).

44. What was Ayesha’s favourite food? (a) Rice (b) Puri and potatoes (c) Shakkarpara (d) Eggs

b) Puri and potatoes (page 61).

45. Where did the Dandi March end? (a) Ahmedabad (b) Dandi seashore (c) Delhi (d) Mumbai

b) Dandi seashore (page 66).

46. What makes water denser in the Dead Sea? (a) Sugar (b) Salt (c) Oil (d) Soil

b) Salt (page 64).

47. What did Ayesha’s mother cook? (a) Rice (b) Puri (c) Eggs (d) Tea

b) Puri (page 61).

48. What can you strain from water? (a) Salt (b) Sugar (c) Chalk powder (d) Milk

c) Chalk powder: It doesn’t dissolve and can be filtered (page 65).

49. Why did Hamid stir sugar in water? (a) To cook it (b) To dissolve it (c) To float it (d) To clean it

b) To dissolve it (page 64).

50. What did Ayesha put in water besides a puri? (a) Soap (b) Dough ball (c) Egg (d) Sugar

b) Dough ball (page 61).

51. True or False: A soap case sinks with soap inside.

False: It floats even with soap (page 62).

52. True or False: All oceans have salty water.

True (page 64).

53. True or False: Oil forms tiny drops in water.

True: Oil doesn’t dissolve (page 65).

54. True or False: Salt is visible after dissolving in water.

False: It becomes invisible (page 65).

55. True or False: The British allowed salt-making at home.

False: They taxed and restricted it (page 66).

56. True or False: A lemon sinks in pure water.

True: It’s denser than pure water (page 64).

57. True or False: Evaporation leaves salt behind in seawater.

True (page 66).

58. True or False: Mishri dissolves slower than sugar powder.

True: Larger lumps take longer (page 66).

59. True or False: A non-puffed puri sinks in water.

True: It lacks air to float (page 61).

60. True or False: The Dead Sea is safe for drinking.

False: It’s too salty (page 64).

61. Why does a plastic bottle cap float on water?

It’s less dense than water due to its material (page 61).

62. What happened to the water Ayesha’s mother boiled?

It evaporated, leaving little water (page 65).

63. How can you dissolve mishri quickly?

Stir it or crush it into smaller pieces (page 66).

64. Why did Gandhiji protest the salt law?

It restricted people from making salt freely (page 66).

65. What is one way to dry papad?

Place it in the sun (page 65).

66. Why can’t you see salt after it dissolves?

It mixes completely with water molecules (page 65).

67. What is one item that sinks in water?

Steel spoon (page 61).

68. What is one item that floats in water?

Plastic bottle cap (page 61).

69. Why does chalk powder settle in water?

It doesn’t dissolve and is denser than water (page 65).

70. What did Ayesha’s cousin want to eat?

Shakkarpara (page 64).

71. Match: Steel plate – (a) Floats (b) Sinks (c) Dissolves (d) Breaks.

b) Sinks (page 61).

72. Match: Soap case – (a) Sinks (b) Floats (c) Dissolves (d) Breaks.

b) Floats (page 62).

73. Match: Salt – (a) Floats (b) Sinks (c) Dissolves (d) Evaporates.

c) Dissolves (page 65).

74. Match: Oil – (a) Dissolves (b) Forms drops (c) Sinks (d) Evaporates.

b) Forms drops (page 65).

75. Match: Dead Sea – (a) Fresh water (b) Salty water (c) Dirty water (d) Boiled water.

b) Salty water (page 64).

76. True or False: A wooden boat sinks in water.

False: It floats due to low density (page 62).

77. True or False: Sugar is visible after dissolving in water.

False: It becomes invisible (page 64).

78. True or False: Aluminium foil always sinks in water.

False: It floats when spread out (page 63).

79. What did Ayesha’s father make when her mother was sick? (a) Puri (b) Tea (c) Shakkarpara (d) Eggs

b) Tea (page 64).

80. Why does a katori float when empty? (a) It’s heavy (b) It traps air (c) It’s dense (d) It’s wet

b) It traps air (page 63).

81. What happens to water with milk after 2 minutes? (a) Separates (b) Dissolves (c) Settles (d) Evaporates

a) Separates: Milk particles may settle slightly (page 65).

82. True or False: Eggs sink in pure water.

True: Eggs are denser than pure water (page 64).

83. What is one way to make salt from seawater?

Dry it in the sun (page 66).

84. Why does oil form drops in water?

It doesn’t mix with water and stays separate (page 65).

85. True or False: A handkerchief dries faster in the shade.

False: It dries faster in the sun (page 66).

86. What did Ayesha boil in water? (a) Puri (b) Eggs (c) Sugar (d) Soap

b) Eggs (page 64).

87. Match: Lemon in salty water – (a) Sinks (b) Floats (c) Dissolves (d) Breaks.

b) Floats (page 64).

88. Match: Iron nail – (a) Floats (b) Sinks (c) Dissolves (d) Evaporates.

b) Sinks (page 63).

89. True or False: Tea leaves dissolve in water.

False: They mix but don’t dissolve (page 66).

90. What is one item that doesn’t dissolve in water?

Oil (page 65).

91. Why did Ayesha add salt to boiling water?

To help eggs float and cook better (page 64).

92. True or False: A plastic bottle filled with water floats.

False: It sinks due to added weight (page 63).

93. What did Hamid want to watch after dissolving sugar? (a) Movie (b) TV (c) Play (d) Dance

b) TV (page 64).

94. Match: Mishri – (a) Floats (b) Sinks (c) Dissolves (d) Evaporates.

c) Dissolves (page 66).

95. True or False: The Dandi March was after India’s independence.

False: It was in 1930, before independence (page 66).

96. What is one way to float an egg in water?

Add salt to increase water density (page 64).

97. Why does a soap bar float in water? (a) It’s dense (b) It’s hollow (c) It traps air (d) It dissolves

c) It traps air: Some soaps have air pockets (page 62).

98. True or False: All metals sink in water.

False: Hollow metal objects like ships float (page 62).

99. What is one item Ayesha’s mother made? (a) Papad (b) Shakkarpara (c) Puri (d) Tea

c) Puri (page 61).

100. Match: Katori – (a) Sinks when empty (b) Floats when empty (c) Dissolves (d) Breaks.

b) Floats when empty (page 63).

Table 1: Floating and Sinking Experiment (Page 63)

Things	Observation (✓ for float, ✗ for sink)
Iron nail	✗
Empty katori	✓
Empty plastic bottle	✓
Plastic bottle filled with water	✗
Aluminium foil (spread out)	✓
Aluminium foil (balled up)	✗

Fill in the blank: The iron nail ___ in water but the katori ___. I think this happened because ___.

The iron nail sank in water but the katori floated. I think this happened because the nail is denser than water, while the empty katori traps air (page 63).

Fill in the blank: The empty plastic bottle ___ on water. The bottle filled with water ___ because ___.

The empty plastic bottle floated on water. The bottle filled with water sank because the added water increased its density (page 63).

Fill in the blank: The aluminium foil ___ when it was spread out. When pressed tightly into a ball it ___ because ___.

The aluminium foil floated when it was spread out. When pressed tightly into a ball it sank because it became denser (page 63).

This table (page 63) records observations from a floating/sinking experiment. Iron nails and balled-up foil sink due to high density. Empty katori and bottle float due to trapped air. Filled bottles sink due to increased weight. Spread foil floats due to air pockets. Data aligns with the experiment’s instructions (page 62).

Table 2: Solubility Experiment (Page 65)

Things	Did it dissolve or not?	What happened after keeping for 2 minutes?
Salt	Dissolved	Water became clear, salt invisible
Soil	Did not dissolve	Soil settled at the bottom
Chalk powder	Did not dissolve	Chalk settled, water cloudy
1 spoon milk	Mixed, did not dissolve	Water became milky, some settling
Oil	Did not dissolve	Oil formed drops on surface

This table (page 65) records a solubility experiment. Salt dissolves completely, becoming invisible. Soil and chalk powder settle, making water cloudy. Milk mixes but doesn’t fully dissolve, with some settling. Oil forms separate drops. Results are based on typical solubility behavior and experiment instructions (page 65).