Class VI Science: A Journey through States of Water

Part 1: Questions from Activities (Pages 142–150)

1. What happens to water in a glass left open overnight? (a) Increases (b) Decreases (c) Stays same (d) Freezes

b) Decreases (page 142, Activity 8.1, due to evaporation).

2. True or False: Water level in an open glass decreases due to evaporation.

True (page 142, Activity 8.1).

3. What forms on the outer surface of a cold water bottle? (a) Ice (b) Water droplets (c) Steam (d) Salt

b) Water droplets (page 143, Activity 8.2, due to condensation).

4. True or False: Condensation occurs on a cold surface.

True (page 143, Activity 8.2).

5. What happens when water is heated in a pan? (a) Freezes (b) Evaporates (c) Condenses (d) Sinks

b) Evaporates (page 144, Activity 8.3).

6. True or False: Boiling water produces steam.

True (page 144, Activity 8.3).

7. What is observed when ice is left in a bowl? (a) Evaporation (b) Melting (c) Condensation (d) Freezing

b) Melting (page 145, Activity 8.4).

8. True or False: Ice turns into water at room temperature.

True (page 145, Activity 8.4).

9. What happens to water in a freezer? (a) Evaporates (b) Condenses (c) Freezes (d) Boils

c) Freezes (page 146, Activity 8.5).

10. True or False: Water turns into ice at 0°C.

True (page 146, Activity 8.5).

11. What is the purpose of Activity 8.1? (Short Answer)

To observe water level decrease in an open glass due to evaporation (page 142).

12. What causes water droplets on a cold bottle? (a) Evaporation (b) Condensation (c) Freezing (d) Boiling

b) Condensation (page 143, Activity 8.2).

13. True or False: Evaporation is faster in sunlight.

True (page 142, Activity 8.1).

14. What is observed above boiling water? (a) Ice (b) Steam (c) Droplets (d) Bubbles

b) Steam (page 144, Activity 8.3).

15. True or False: Ice melts faster in warm conditions.

True (page 145, Activity 8.4).

16. What is the purpose of Activity 8.3? (Short Answer)

To observe evaporation and steam formation when heating water (page 144).

17. True or False: Freezing occurs at 100°C.

False (page 146, Activity 8.5, occurs at 0°C).

18. What state is water in at 0°C? (a) Liquid (b) Solid (c) Gas (d) Both solid and liquid

d) Both solid and liquid (page 146, Activity 8.5).

19. True or False: Condensation turns water vapor into liquid.

True (page 143).

20. What is the purpose of Activity 8.4? (Short Answer)

To observe ice melting into water at room temperature (page 145).

21. What happens to water vapor on a cold surface? (a) Evaporates (b) Condenses (c) Freezes (d) Boils

b) Condenses (page 143, Activity 8.2).

22. True or False: Evaporation cools the surroundings.

True (page 144).

23. What is the boiling point of water? (a) 0°C (b) 50°C (c) 100°C (d) 200°C

c) 100°C (page 144, Activity 8.3).

24. True or False: Water can exist in all three states naturally.

True (page 147).

25. What is the freezing point of water? (a) 0°C (b) 100°C (c) 50°C (d) -10°C

a) 0°C (page 146, Activity 8.5).

Part 2: Questions from “Let us enhance our learning” (Pages 151–154)

26. The process of water turning into vapor is called: (a) Condensation (b) Evaporation (c) Freezing (d) Melting

b) Evaporation (page 151).

27. True or False: Condensation is the opposite of evaporation.

True (page 151).

28. What is the state of water at 100°C? (a) Solid (b) Liquid (c) Gas (d) Both liquid and gas

d) Both liquid and gas (page 151).

29. True or False: Water vapor is invisible.

True (page 151).

30. What forms clouds? (a) Evaporation (b) Condensation (c) Freezing (d) Melting

b) Condensation (page 152).

31. True or False: Boiling and evaporation are the same process.

False (page 152, boiling occurs at 100°C, evaporation at any temperature).

32. What is the process of ice turning into water? (a) Evaporation (b) Condensation (c) Melting (d) Freezing

c) Melting (page 152).

33. True or False: Melting occurs at 0°C.

True (page 152).

34. What is the purpose of Fig. 8.1? (Short Answer)

To illustrate the water cycle showing evaporation, condensation, and precipitation (page 153).

35. True or False: The water cycle includes evaporation and condensation.

True (page 153).

36. What causes rain? (a) Evaporation (b) Condensation (c) Freezing (d) Melting

b) Condensation (page 153).

37. True or False: Snow is formed by freezing water vapor.

True (page 153).

38. What is the state of water in clouds? (a) Solid (b) Liquid (c) Gas (d) Both liquid and gas

b) Liquid (page 153).

39. True or False: Evaporation occurs only on water surfaces.

False (page 151, can occur from plants, soil, etc.).

40. What is transpiration? (Short Answer)

Evaporation of water from plant leaves (page 151).

Part 3: Questions from “Learning further” (Page 155)

41. Where can you observe the water cycle? (a) Kitchen (b) Nature (c) Laboratory (d) Classroom

b) Nature (page 155).

42. True or False: The water cycle affects weather patterns.

True (page 155).

43. What can you study in a weather station? (Short Answer)

Water cycle processes like evaporation, condensation, and precipitation (page 155).

44. True or False: Fog is formed by condensation.

True (page 155).

45. What is dew? (a) Frozen water (b) Condensed water droplets (c) Evaporated water (d) Boiled water

b) Condensed water droplets (page 155).

46. True or False: The water cycle is a continuous process.

True (page 155).

47. What is the role of the Sun in the water cycle? (Short Answer)

Provides heat for evaporation (page 155).

48. True or False: Hail is a form of precipitation.

True (page 155).

Part 4: Additional Questions (Pages 142–159)

49. What is water vapor? (a) Solid water (b) Liquid water (c) Gaseous water (d) Frozen water

c) Gaseous water (page 142).

50. True or False: Water can change states without heat.

False (page 147).

51. What is the state of water at -10°C? (a) Solid (b) Liquid (c) Gas (d) Both solid and liquid

a) Solid (page 146).

52. True or False: Evaporation occurs faster in windy conditions.

True (page 142).

53. Match: Evaporation – (a) Liquid to gas (b) Gas to liquid (c) Solid to liquid (d) Liquid to solid.

a) Liquid to gas (page 142).

54. True or False: Condensation releases heat.

True (page 143).

55. What is the state of water at 50°C? (a) Solid (b) Liquid (c) Gas (d) Both liquid and gas

b) Liquid (page 147).

56. True or False: Freezing releases heat.

True (page 146).

57. Match: Condensation – (a) Liquid to gas (b) Gas to liquid (c) Solid to liquid (d) Liquid to solid.

b) Gas to liquid (page 143).

58. True or False: Water boils at 100°C under standard pressure.

True (page 144).

59. What is the process of water turning into ice? (a) Evaporation (b) Condensation (c) Freezing (d) Melting

c) Freezing (page 146).

60. True or False: Melting absorbs heat.

True (page 145).

61. What is the water cycle? (Short Answer)

The continuous movement of water through evaporation, condensation, and precipitation (page 153).

62. True or False: Steam is visible water vapor.

False (page 144, steam is water vapor, but visible as tiny droplets).

63. Match: Melting – (a) Liquid to gas (b) Gas to liquid (c) Solid to liquid (d) Liquid to solid.

c) Solid to liquid (page 145).

64. True or False: Evaporation occurs at any temperature.

True (page 142).

65. What is the state of water at 200°C? (a) Solid (b) Liquid (c) Gas (d) Both liquid and gas

c) Gas (page 147).

66. True or False: Condensation occurs at high temperatures.

False (page 143, occurs at lower temperatures).

67. Match: Freezing – (a) Liquid to gas (b) Gas to liquid (c) Solid to liquid (d) Liquid to solid.

d) Liquid to solid (page 146).

68. True or False: The water cycle involves the Sun’s heat.

True (page 155).

69. What forms when water vapor cools in the air? (a) Ice (b) Clouds (c) Steam (d) Snow

b) Clouds (page 153).

70. True or False: Precipitation includes rain and snow.

True (page 153).

71. What is the boiling point of water in Fahrenheit? (a) 212°F (b) 32°F (c) 98.6°F (d) 0°F

a) 212°F (inferred, page 144).

72. True or False: Water vapor condenses to form dew.

True (page 155).

73. Match: Water cycle – (a) Evaporation only (b) Condensation only (c) Evaporation and condensation (d) Freezing only.

c) Evaporation and condensation (page 153).

74. True or False: Evaporation is faster in a closed container.

False (page 142).

75. What is the freezing point of water in Fahrenheit? (a) 212°F (b) 32°F (c) 98.6°F (d) 0°F

b) 32°F (inferred, page 146).

76. True or False: Clouds are formed by freezing.

False (page 153, formed by condensation).

77. What is the purpose of Activity 8.2? (Short Answer)

To observe condensation on a cold water bottle (page 143).

78. True or False: Water can exist as solid, liquid, and gas at 0°C.

False (page 147, only solid and liquid).

79. Match: Boiling point – (a) 0°C (b) 100°C (c) 50°C (d) -10°C.

b) 100°C (page 144).

80. True or False: Condensation occurs in clouds.

True (page 153).

81. What is the state of water at 25°C? (a) Solid (b) Liquid (c) Gas (d) Both liquid and gas

b) Liquid (page 147).

82. True or False: Evaporation is a cooling process.

True (page 144).

83. Match: Freezing point – (a) 0°C (b) 100°C (c) 50°C (d) -10°C.

a) 0°C (page 146).

84. True or False: Water vapor is heavier than air.

False (page 151).

85. What is the purpose of Activity 8.5? (Short Answer)

To observe water turning into ice in a freezer (page 146).

86. True or False: Snow is a form of condensation.

False (page 153, it’s precipitation).

87. Match: Water vapor – (a) Solid (b) Liquid (c) Gas (d) Both liquid and gas.

c) Gas (page 142).

88. True or False: The water cycle recycles water on Earth.

True (page 153).

89. What is the boiling point of water in Kelvin? (a) 273.15 K (b) 373.15 K (c) 310.15 K (d) 0 K

b) 373.15 K (page 144, 100°C + 273.15).

90. True or False: Dew forms on cold surfaces at night.

True (page 155).

91. Match: Precipitation – (a) Rain and snow (b) Evaporation (c) Condensation (d) Melting.

a) Rain and snow (page 153).

92. True or False: Evaporation occurs only in sunlight.

False (page 142).

93. What is the freezing point of water in Kelvin? (a) 273.15 K (b) 373.15 K (c) 310.15 K (d) 0 K

a) 273.15 K (page 146, 0°C + 273.15).

94. True or False: Fog is a form of precipitation.

False (page 155, it’s condensation).

95. What is the purpose of Fig. 8.2? (Short Answer)

To show states of water and their transitions (page 147).

96. True or False: Water can change from solid to gas directly.

True (page 147, sublimation).

97. Match: Sublimation – (a) Liquid to gas (b) Gas to liquid (c) Solid to gas (d) Liquid to solid.

c) Solid to gas (page 147).

98. True or False: Condensation is a warming process.

True (page 143).

99. What is the state of water at 150°C? (a) Solid (b) Liquid (c) Gas (d) Both liquid and gas

c) Gas (page 147).

100. True or False: The water cycle is driven by wind.

False (page 155, driven by Sun’s heat).

101. Match: Dew – (a) Frozen water (b) Condensed water (c) Evaporated water (d) Boiled water.

b) Condensed water (page 155).

102. True or False: Evaporation occurs faster with higher humidity.

False (page 142).

103. What is the process of gas turning into solid? (a) Sublimation (b) Deposition (c) Condensation (d) Evaporation

b) Deposition (page 147).

104. True or False: Hail is formed by condensation.

False (page 153, it’s precipitation).

105. Match: Boiling – (a) Liquid to gas at 100°C (b) Gas to liquid (c) Solid to liquid (d) Liquid to solid.

a) Liquid to gas at 100°C (page 144).

106. True or False: Water vapor rises due to its lower density.

True (page 151).

107. What is the role of plants in the water cycle? (Short Answer)

Plants release water vapor through transpiration (page 151).

108. True or False: Freezing occurs at 0°C under standard pressure.

True (page 146).

109. Match: Clouds – (a) Solid water (b) Liquid water droplets (c) Gaseous water (d) Frozen water.

b) Liquid water droplets (page 153).

110. True or False: Evaporation is slower in humid conditions.

True (page 142).

111. What is the state of water at -5°C? (a) Solid (b) Liquid (c) Gas (d) Both solid and liquid

a) Solid (page 146).

112. True or False: Condensation forms clouds in the sky.

True (page 153).

113. Match: Transpiration – (a) Evaporation from plants (b) Condensation in plants (c) Freezing in plants (d) Melting in plants.

a) Evaporation from plants (page 151).

114. True or False: Water can exist as liquid at 100°C.

True (page 147).

115. What is the purpose of Activity 8.3? (Short Answer)

To observe boiling and steam formation in water (page 144).

116. True or False: Sublimation is common in everyday conditions.

False (page 147).

117. Match: Steam – (a) Solid water (b) Liquid water (c) Gaseous water (d) Frozen water.

c) Gaseous water (page 144).

118. True or False: The water cycle includes oceans and rivers.

True (page 153).

119. What is the state of water at 75°C? (a) Solid (b) Liquid (c) Gas (d) Both liquid and gas

b) Liquid (page 147).

120. True or False: Evaporation requires heat energy.

True (page 142).

121. Match: Rain – (a) Evaporation (b) Condensation (c) Precipitation (d) Melting.

c) Precipitation (page 153).

122. True or False: Condensation occurs at 0°C.

False (page 143).

123. What is the purpose of Fig. 8.3? (Short Answer)

To show condensation on a cold surface (page 143).

124. True or False: Ice can turn into vapor without melting.

True (page 147, sublimation).

125. Match: Snow – (a) Evaporation (b) Condensation (c) Precipitation (d) Melting.

c) Precipitation (page 153).

126. True or False: Boiling occurs at any temperature.

False (page 144).

127. What is the state of water at 300°C? (a) Solid (b) Liquid (c) Gas (d) Both liquid and gas

c) Gas (page 147).

128. True or False: The water cycle is essential for life.

True (page 153).

129. Match: Fog – (a) Evaporation (b) Condensation (c) Precipitation (d) Melting.

b) Condensation (page 155).

130. True or False: Evaporation occurs faster in dry conditions.

True (page 142).

131. What is the purpose of Activity 8.4? (Short Answer)

To observe the melting of ice into water (page 145).

132. True or False: Water vapor is part of the atmosphere.

True (page 151).

133. Match: Hail – (a) Evaporation (b) Condensation (c) Precipitation (d) Melting.

c) Precipitation (page 153).

134. True or False: Condensation occurs only on cold surfaces.

False (page 153, also occurs in air).

135. What is the state of water at -20°C? (a) Solid (b) Liquid (c) Gas (d) Both solid and liquid

a) Solid (page 146).

136. True or False: The water cycle involves groundwater.

True (page 153).

137. Match: Ice – (a) Solid water (b) Liquid water (c) Gaseous water (d) Both liquid and gas.

a) Solid water (page 146).

138. True or False: Evaporation is part of the water cycle.

True (page 153).

139. What is the purpose of Activity 8.1? (Short Answer)

To observe water level decrease due to evaporation (page 142).

140. True or False: Boiling requires heat energy.

True (page 144).

141. Match: Water at 100°C – (a) Solid (b) Liquid (c) Gas (d) Both liquid and gas.

d) Both liquid and gas (page 147).

142. True or False: Condensation forms dew on grass.

True (page 155).

143. What is the state of water at 10°C? (a) Solid (b) Liquid (c) Gas (d) Both solid and liquid

b) Liquid (page 147).

144. True or False: Sublimation turns ice into water vapor.

True (page 147).

145. Match: Water at 0°C – (a) Solid (b) Liquid (c) Gas (d) Both solid and liquid.

d) Both solid and liquid (page 147).

146. True or False: The water cycle includes lakes and rivers.

True (page 153).

147. What is the purpose of Fig. 8.1? (Short Answer)

To illustrate the water cycle and its processes (page 153).

148. True or False: Evaporation occurs from soil.

True (page 151).

149. Match: Water vapor – (a) Solid (b) Liquid (c) Gas (d) Both liquid and gas.

c) Gas (page 142).

150. True or False: Condensation occurs in the water cycle.

True (page 153).

151. What is the state of water at -50°C? (a) Solid (b) Liquid (c) Gas (d) Both solid and liquid

a) Solid (page 146).

152. True or False: Boiling is a rapid form of evaporation.

True (page 144).

153. Match: Clouds – (a) Evaporation (b) Condensation (c) Precipitation (d) Melting.

b) Condensation (page 153).

154. True or False: Freezing turns water into ice.

True (page 146).

155. What is the purpose of Activity 8.2? (Short Answer)

To observe condensation on a cold surface (page 143).

156. True or False: The water cycle is powered by the Moon.

False (page 155, powered by the Sun).

157. Match: Boiling point in Fahrenheit – (a) 212°F (b) 32°F (c) 98.6°F (d) 0°F.

a) 212°F (inferred, page 144).

158. True or False: Melting occurs at 100°C.

False (page 145, occurs at 0°C).

159. What is the state of water at 90°C? (a) Solid (b) Liquid (c) Gas (d) Both liquid and gas

b) Liquid (page 147).

160. True or False: Condensation forms raindrops.

True (page 153).

161. Match: Freezing point in Fahrenheit – (a) 212°F (b) 32°F (c) 98.6°F (d) 0°F.

b) 32°F (inferred, page 146).

162. True or False: Evaporation occurs from oceans.

True (page 153).

163. What is the purpose of Activity 8.5? (Short Answer)

To observe freezing of water into ice (page 146).

164. True or False: Sublimation turns water vapor into ice.

False (page 147, deposition does).

165. Match: Water at -10°C – (a) Solid (b) Liquid (c) Gas (d) Both solid and liquid.

a) Solid (page 146).

166. True or False: The water cycle includes transpiration.

True (page 151).

167. What is the state of water at 110°C? (a) Solid (b) Liquid (c) Gas (d) Both liquid and gas

c) Gas (page 147).

168. True or False: Condensation occurs at high humidity.

True (page 143).

169. Match: Water cycle – (a) Sun-driven (b) Moon-driven (c) Wind-driven (d) Earth-driven.

a) Sun-driven (page 155).

170. True or False: Evaporation occurs from lakes.

True (page 153).

171. What is the purpose of Fig. 8.2? (Short Answer)

To illustrate transitions between water states (page 147).

172. True or False: Freezing occurs at -10°C.

True (page 146).

173. Match: Raindrops – (a) Evaporation (b) Condensation (c) Precipitation (d) Melting.

c) Precipitation (page 153).

174. True or False: Boiling occurs at 0°C.

False (page 144).

175. What is the state of water at 5°C? (a) Solid (b) Liquid (c) Gas (d) Both solid and liquid

b) Liquid (page 147).

176. True or False: Condensation forms frost.

False (page 155, deposition forms frost).

177. Match: Water at 50°C – (a) Solid (b) Liquid (c) Gas (d) Both liquid and gas.

b) Liquid (page 147).

178. True or False: Evaporation is faster in open containers.

True (page 142).

179. What is the purpose of Activity 8.3? (Short Answer)

To observe boiling and steam formation (page 144).

180. True or False: The water cycle involves glaciers.

True (page 153).

181. Match: Frost – (a) Evaporation (b) Condensation (c) Deposition (d) Melting.

c) Deposition (page 155).

182. True or False: Condensation occurs at low temperatures.

True (page 143).

183. What is the state of water at 250°C? (a) Solid (b) Liquid (c) Gas (d) Both liquid and gas

c) Gas (page 147).

184. True or False: Evaporation occurs from plants.

True (page 151).

185. Match: Water at -5°C – (a) Solid (b) Liquid (c) Gas (d) Both solid and liquid.

a) Solid (page 146).

186. True or False: The water cycle affects climate.

True (page 155).

187. What is the purpose of Activity 8.4? (Short Answer)

To observe ice melting into water (page 145).

188. True or False: Boiling occurs at 50°C.

False (page 144).

189. Match: Water at 25°C – (a) Solid (b) Liquid (c) Gas (d) Both liquid and gas.

b) Liquid (page 147).

190. True or False: Condensation forms clouds and rain.

True (page 153).

191. What is the state of water at 80°C? (a) Solid (b) Liquid (c) Gas (d) Both liquid and gas

b) Liquid (page 147).

192. True or False: Evaporation occurs from rivers.

True (page 153).

193. Match: Water cycle – (a) Evaporation only (b) Condensation only (c) Evaporation, condensation, precipitation (d) Melting only.

c) Evaporation, condensation, precipitation (page 153).

194. True or False: Freezing occurs at 100°C.

False (page 146, occurs at 0°C).

195. What is the purpose of Fig. 8.3? (Short Answer)

To illustrate condensation on a cold surface (page 143).

196. True or False: The water cycle involves clouds.

True (page 153).

197. Match: Water at 200°C – (a) Solid (b) Liquid (c) Gas (d) Both liquid and gas.

c) Gas (page 147).

198. True or False: Evaporation occurs from groundwater.

True (page 153).

199. What is the state of water at 15°C? (a) Solid (b) Liquid (c) Gas (d) Both solid and liquid

b) Liquid (page 147).

200. True or False: Condensation forms snow in clouds.

False (page 153, snow is precipitation).

201. Match: Deposition – (a) Liquid to gas (b) Gas to solid (c) Solid to liquid (d) Liquid to solid.

b) Gas to solid (page 147).

202. True or False: The water cycle includes precipitation.

True (page 153).

203. What is the purpose of Activity 8.1? (Short Answer)

To observe water level decrease due to evaporation (page 142).

204. True or False: Boiling turns water into steam.

True (page 144).

205. Match: Water at -15°C – (a) Solid (b) Liquid (c) Gas (d) Both solid and liquid.

a) Solid (page 146).

206. True or False: Evaporation is faster in low humidity.

True (page 142).

207. What is the state of water at 120°C? (a) Solid (b) Liquid (c) Gas (d) Both liquid and gas

c) Gas (page 147).

208. True or False: Condensation forms dew on cold surfaces.

True (page 155).

Table 8.1: Activity 8.1 – Observing Evaporation (Page 142)

Day	Water Level (cm)	Conditions
1	10.0	Sunny, open container
2	9.5	Sunny, open container
3	9.0	Cloudy, open container

Note: Values are illustrative based on evaporation observations (page 142). Actual values depend on experiment conditions.

Table 8.2: Activity 8.3 – Observing Boiling (Page 144)

Time (min)	Temperature (°C)	Observations
0	25	Water at room temperature
5	80	Bubbles forming
10	100	Boiling, steam visible

Note: Values are illustrative based on boiling process (page 144). Actual values depend on heating conditions.