Prepare for the AISSEE Class 6 exam with multiple-choice questions (MCQs) on evaporation, condensation, and the water cycle. Get detailed explanations, conceptual insights, and revision support. Perfect for Sainik School Entrance Exam aspirants!
Here’s a comprehensive set of 100 MCQs with detailed answers and explanations for the topic “GK: Evaporation, Condensation, and Water Cycle” for AISSEE Class 6.
GK: Evaporation, Condensation, and Water Cycle – MCQs for AISSEE Class 6
1. What is evaporation?
a) Conversion of water into ice
b) Conversion of water into vapor
c) Conversion of vapor into water
d) Melting of ice
✅ Answer: b) Conversion of water into vapor
🔹 Explanation: Evaporation is the process in which water changes into water vapor due to heat from the sun or other sources.
2. Which factor increases the rate of evaporation?
a) High humidity
b) Low temperature
c) Increased surface area
d) Less wind speed
✅ Answer: c) Increased surface area
🔹 Explanation: The larger the surface area, the more water molecules can escape into the air, leading to faster evaporation.
3. What is condensation?
a) Conversion of water vapor into liquid
b) Conversion of ice into water
c) Conversion of water into gas
d) Melting of ice
✅ Answer: a) Conversion of water vapor into liquid
🔹 Explanation: When water vapor cools down, it changes back into liquid form, which is called condensation.
4. Which of the following is an example of condensation?
a) Formation of clouds
b) Melting of ice cream
c) Drying of clothes in the sun
d) Boiling of water
✅ Answer: a) Formation of clouds
🔹 Explanation: Clouds form when water vapor cools and condenses into tiny water droplets in the atmosphere.
5. The continuous movement of water between the earth and atmosphere is called the _____.
a) Carbon cycle
b) Oxygen cycle
c) Water cycle
d) Rock cycle
✅ Answer: c) Water cycle
🔹 Explanation: The water cycle describes the movement of water through evaporation, condensation, and precipitation.
6. What happens to the rate of evaporation when the temperature increases?
a) It decreases
b) It increases
c) It remains the same
d) It first increases and then decreases
✅ Answer: b) It increases
🔹 Explanation: Higher temperature provides more energy to water molecules, making them escape faster into the air as water vapor.
7. What process forms clouds in the sky?
a) Evaporation
b) Condensation
c) Precipitation
d) Sublimation
✅ Answer: b) Condensation
🔹 Explanation: Water vapor cools and condenses into tiny droplets, forming clouds.
8. Which of the following is NOT a stage of the water cycle?
a) Evaporation
b) Condensation
c) Precipitation
d) Photosynthesis
✅ Answer: d) Photosynthesis
🔹 Explanation: Photosynthesis is the process by which plants make food, whereas the water cycle involves evaporation, condensation, and precipitation.
9. Which factor decreases the rate of evaporation?
a) High temperature
b) Strong wind
c) High humidity
d) Large surface area
✅ Answer: c) High humidity
🔹 Explanation: When the air is already full of water vapor (high humidity), less evaporation occurs.
10. What is precipitation?
a) The process of water turning into vapor
b) The process of ice melting
c) The falling of water in the form of rain, snow, or hail
d) The formation of clouds
✅ Answer: c) The falling of water in the form of rain, snow, or hail
🔹 Explanation: Precipitation occurs when condensed water droplets become too heavy and fall to the earth as rain, snow, or hail.
11. Which of the following is an example of evaporation?
a) Formation of clouds
b) Boiling water turning into steam
c) Rain falling from the sky
d) Dew forming on leaves
✅ Answer: b) Boiling water turning into steam
🔹 Explanation: When water is heated, it changes into steam, an example of evaporation.
12. Why do wet clothes dry faster on a sunny day than on a cloudy day?
a) Because the sun provides heat, increasing evaporation
b) Because the clouds absorb water from the clothes
c) Because the air on a cloudy day is cooler
d) Because evaporation stops on cloudy days
✅ Answer: a) Because the sun provides heat, increasing evaporation
🔹 Explanation: Heat from the sun increases the energy of water molecules, making them evaporate faster.
13. Where does most of the Earth’s evaporation occur?
a) Lakes
b) Rivers
c) Oceans
d) Ponds
✅ Answer: c) Oceans
🔹 Explanation: Since oceans cover a large part of the Earth and receive direct sunlight, most of the evaporation happens there.
14. Which of the following statements about condensation is true?
a) It occurs when water vapor cools down
b) It changes liquid water into gas
c) It increases with high temperature
d) It is the process of turning water into ice
✅ Answer: a) It occurs when water vapor cools down
🔹 Explanation: Condensation happens when warm water vapor cools and turns into liquid droplets.
15. Why do we see water droplets on the outside of a cold glass of water?
a) Because the water from the glass leaks out
b) Because of condensation of water vapor from the air
c) Because of evaporation of the water inside the glass
d) Because of precipitation
✅ Answer: b) Because of condensation of water vapor from the air
🔹 Explanation: The cold surface of the glass causes water vapor in the air to cool down and form water droplets.
16. What happens when warm air rises and cools?
a) Evaporation
b) Condensation
c) Sublimation
d) Melting
✅ Answer: b) Condensation
🔹 Explanation: As warm air rises, it cools and condenses into water droplets, forming clouds.
17. Which part of the water cycle is responsible for groundwater formation?
a) Evaporation
b) Transpiration
c) Infiltration
d) Condensation
✅ Answer: c) Infiltration
🔹 Explanation: Infiltration is the process where water seeps into the ground to form groundwater.
18. What is the primary source of energy for the water cycle?
a) Wind
b) Sun
c) Moon
d) Gravity
✅ Answer: b) Sun
🔹 Explanation: The sun provides heat, which drives the processes of evaporation and transpiration in the water cycle.
19. Which process returns water to the atmosphere from plants?
a) Condensation
b) Transpiration
c) Precipitation
d) Evaporation
✅ Answer: b) Transpiration
🔹 Explanation: Transpiration is the process by which water evaporates from plant leaves into the atmosphere.
20. What type of precipitation forms when raindrops freeze in the air before reaching the ground?
a) Snow
b) Hail
c) Sleet
d) Rain
✅ Answer: c) Sleet
🔹 Explanation: Sleet occurs when raindrops freeze before hitting the ground.
21. What happens to water when it evaporates?
a) It turns into ice
b) It changes into water vapor
c) It condenses into water droplets
d) It becomes solid
✅ Answer: b) It changes into water vapor
🔹 Explanation: Evaporation is the process by which water changes from a liquid to a gaseous state due to heat.
22. What is the role of transpiration in the water cycle?
a) It helps in cloud formation
b) It transfers water from plants to the atmosphere
c) It leads to groundwater formation
d) It prevents precipitation
✅ Answer: b) It transfers water from plants to the atmosphere
🔹 Explanation: Transpiration is the process by which water is released from plant leaves into the atmosphere as water vapor.
23. What happens to water vapor when it cools down?
a) It condenses into liquid water
b) It turns into ice immediately
c) It remains as vapor
d) It disappears
✅ Answer: a) It condenses into liquid water
🔹 Explanation: When water vapor cools, it turns into tiny droplets of liquid, forming clouds or dew.
24. Which of the following is NOT a form of precipitation?
a) Rain
b) Snow
c) Hail
d) Fog
✅ Answer: d) Fog
🔹 Explanation: Fog is a form of condensation where tiny water droplets remain suspended in the air close to the ground.
25. Which process is the opposite of evaporation?
a) Condensation
b) Precipitation
c) Transpiration
d) Sublimation
✅ Answer: a) Condensation
🔹 Explanation: Evaporation converts liquid water into gas, while condensation converts water vapor back into liquid.
26. What causes rain?
a) Evaporation of water
b) Cooling and condensation of water vapor
c) Melting of ice
d) Absorption of water by plants
✅ Answer: b) Cooling and condensation of water vapor
🔹 Explanation: When water vapor in the air cools and condenses, it forms clouds. When the droplets become too heavy, they fall as rain.
27. How does the sun play a role in the water cycle?
a) It causes precipitation
b) It provides heat for evaporation
c) It helps in infiltration
d) It absorbs water from the soil
✅ Answer: b) It provides heat for evaporation
🔹 Explanation: The sun’s heat causes water from oceans, lakes, and rivers to evaporate, which is the first step in the water cycle.
28. Which type of precipitation occurs in winter and consists of soft, white ice crystals?
a) Rain
b) Hail
c) Snow
d) Sleet
✅ Answer: c) Snow
🔹 Explanation: Snow forms when water vapor in the clouds freezes into ice crystals due to low temperatures.
29. Why do puddles of water disappear after some time on a sunny day?
a) The water gets absorbed by the ground
b) The water evaporates into the air
c) The water condenses into clouds
d) The water freezes
✅ Answer: b) The water evaporates into the air
🔹 Explanation: The heat from the sun increases evaporation, causing the water in the puddles to turn into vapor.
30. What is the process in which water moves through plants and is released as vapor?
a) Condensation
b) Transpiration
c) Evaporation
d) Precipitation
✅ Answer: b) Transpiration
🔹 Explanation: Transpiration is the release of water vapor from the leaves of plants into the atmosphere.
31. What happens when warm air rises in the atmosphere?
a) It cools and condenses
b) It heats up more
c) It forms ice directly
d) It evaporates into space
✅ Answer: a) It cools and condenses
🔹 Explanation: As warm air rises, it cools, leading to condensation and cloud formation.
32. Which of the following is NOT a source of water vapor in the atmosphere?
a) Oceans
b) Rivers
c) Rocks
d) Lakes
✅ Answer: c) Rocks
🔹 Explanation: Water vapor enters the atmosphere mainly through evaporation from oceans, lakes, and rivers, but not from rocks.
33. What factor influences the rate of condensation the most?
a) Temperature
b) Wind speed
c) Amount of sunlight
d) Type of soil
✅ Answer: a) Temperature
🔹 Explanation: When temperature drops, water vapor condenses faster into liquid droplets.
34. What is the process by which ice directly changes into water vapor without becoming liquid?
a) Evaporation
b) Condensation
c) Sublimation
d) Precipitation
✅ Answer: c) Sublimation
🔹 Explanation: Sublimation occurs when solid ice changes directly into gas without becoming a liquid, like dry ice.
35. Why do we see fog in the morning?
a) Because of evaporation of water from plants
b) Because water vapor condenses near the ground due to cool temperatures
c) Because of high-speed winds
d) Because water evaporates at night
✅ Answer: b) Because water vapor condenses near the ground due to cool temperatures
🔹 Explanation: When the air near the ground cools, water vapor condenses into tiny droplets, forming fog.
36. What do we call the water that collects underground?
a) Surface water
b) Groundwater
c) Rainwater
d) Ocean water
✅ Answer: b) Groundwater
🔹 Explanation: Water that seeps into the soil and is stored underground is called groundwater.
37. How does wind speed affect evaporation?
a) Increases it
b) Decreases it
c) Has no effect
d) Stops it completely
✅ Answer: a) Increases it
🔹 Explanation: Higher wind speeds remove water vapor quickly, making evaporation faster.
38. What do we call water that falls to Earth as rain, snow, or hail?
a) Condensation
b) Precipitation
c) Evaporation
d) Transpiration
✅ Answer: b) Precipitation
🔹 Explanation: Precipitation occurs when water droplets in clouds become heavy and fall as rain, snow, or hail.
39. Why does dew form on grass in the morning?
a) Because of evaporation
b) Because the air is warm
c) Because of condensation of water vapor on cool surfaces
d) Because of high wind speed
✅ Answer: c) Because of condensation of water vapor on cool surfaces
🔹 Explanation: Dew forms when warm air cools at night, causing water vapor to condense on surfaces like grass.
40. Which of the following best describes the function of clouds in the water cycle?
a) They cause evaporation
b) They store and release water through precipitation
c) They absorb water from the ground
d) They stop transpiration from plants
✅ Answer: b) They store and release water through precipitation
🔹 Explanation: Clouds hold condensed water vapor and release it as precipitation when the droplets become heavy.
41. Which process helps return water to rivers and lakes from land?
a) Condensation
b) Evaporation
c) Runoff
d) Transpiration
✅ Answer: c) Runoff
🔹 Explanation: Runoff occurs when water from precipitation flows over land and returns to rivers, lakes, or oceans.
42. What is the main cause of ocean water evaporation?
a) Wind
b) Sunlight
c) Gravity
d) Ocean waves
✅ Answer: b) Sunlight
🔹 Explanation: The sun’s heat provides energy that turns ocean water into vapor through evaporation.
43. Which of the following conditions will increase the rate of evaporation?
a) High humidity
b) Low temperature
c) Strong winds
d) Cloudy weather
✅ Answer: c) Strong winds
🔹 Explanation: Wind removes water vapor from the surface, allowing more water to evaporate quickly.
44. What is the process of water turning from a gas to a liquid called?
a) Evaporation
b) Transpiration
c) Condensation
d) Precipitation
✅ Answer: c) Condensation
🔹 Explanation: Condensation occurs when water vapor cools down and changes back into liquid water.
45. Which form of precipitation is made of frozen raindrops?
a) Snow
b) Hail
c) Sleet
d) Fog
✅ Answer: c) Sleet
🔹 Explanation: Sleet forms when raindrops freeze before hitting the ground.
46. Why do clothes dry faster on a windy day?
a) The wind cools the air
b) Wind increases the rate of condensation
c) Wind removes water vapor from the clothes quickly
d) The sun is brighter on windy days
✅ Answer: c) Wind removes water vapor from the clothes quickly
🔹 Explanation: The movement of air helps in removing evaporated water, making clothes dry faster.
47. What do we call the small drops of water that form on cool surfaces at night?
a) Snow
b) Hail
c) Dew
d) Fog
✅ Answer: c) Dew
🔹 Explanation: Dew forms when water vapor in the air condenses on cool surfaces.
48. Which of the following causes an increase in humidity?
a) More evaporation
b) Less water in the air
c) Less condensation
d) Strong winds
✅ Answer: a) More evaporation
🔹 Explanation: Increased evaporation adds more water vapor to the air, raising humidity levels.
49. Which process is responsible for water moving through plants?
a) Condensation
b) Transpiration
c) Precipitation
d) Runoff
✅ Answer: b) Transpiration
🔹 Explanation: Transpiration is the release of water vapor from plant leaves into the atmosphere.
50. What happens when the air cannot hold any more water vapor?
a) Evaporation stops
b) Condensation occurs
c) The temperature increases
d) Wind speed increases
✅ Answer: b) Condensation occurs
🔹 Explanation: When air becomes saturated, excess water vapor condenses into droplets, leading to cloud formation and precipitation.
51. What happens when air is cooled below its dew point?
a) Evaporation occurs
b) Condensation occurs
c) Air pressure decreases
d) Wind speed increases
✅ Answer: b) Condensation occurs
🔹 Explanation: When air cools below its dew point, water vapor condenses into liquid, forming dew, fog, or clouds.
52. What is the primary source of water vapor in the atmosphere?
a) Melting glaciers
b) Evaporation from oceans
c) Transpiration from plants
d) Groundwater seepage
✅ Answer: b) Evaporation from oceans
🔹 Explanation: Oceans cover a large part of the Earth’s surface, making them the main source of evaporated water vapor.
53. What do clouds mainly consist of?
a) Water droplets and ice crystals
b) Dust particles only
c) Carbon dioxide gas
d) Salt particles
✅ Answer: a) Water droplets and ice crystals
🔹 Explanation: Clouds are made of tiny water droplets or ice crystals that form when water vapor condenses.
54. What type of precipitation forms when rain passes through a layer of freezing air?
a) Snow
b) Hail
c) Sleet
d) Dew
✅ Answer: c) Sleet
🔹 Explanation: Sleet forms when raindrops freeze while falling through a cold air layer.
55. Which factor decreases the rate of evaporation?
a) High temperature
b) Low humidity
c) Still air (no wind)
d) Strong sunlight
✅ Answer: c) Still air (no wind)
🔹 Explanation: Wind removes water vapor, allowing more evaporation. Still air slows the process.
56. What causes water vapor to turn into tiny droplets in the air?
a) Increase in temperature
b) Decrease in temperature
c) High wind speed
d) Low humidity
✅ Answer: b) Decrease in temperature
🔹 Explanation: When air cools, water vapor condenses into tiny water droplets, forming clouds.
57. What is the process by which groundwater reaches the surface?
a) Evaporation
b) Condensation
c) Infiltration
d) Springs or wells
✅ Answer: d) Springs or wells
🔹 Explanation: Groundwater can reach the surface naturally through springs or by human-made wells.
58. What happens when raindrops pass through very cold layers of air and freeze into ice before reaching the ground?
a) Snow
b) Hail
c) Dew
d) Sleet
✅ Answer: b) Hail
🔹 Explanation: Hailstones form when raindrops are carried up and down in storm clouds, freezing into layers of ice.
59. What do we call the continuous movement of water through Earth’s atmosphere and surface?
a) Evaporation cycle
b) Water cycle
c) Condensation process
d) Rain cycle
✅ Answer: b) Water cycle
🔹 Explanation: The water cycle describes the movement of water through evaporation, condensation, precipitation, and collection.
60. Which of the following is an example of condensation?
a) Formation of fog in the morning
b) A puddle drying under the sun
c) Ice melting into water
d) Clothes drying on a clothesline
✅ Answer: a) Formation of fog in the morning
🔹 Explanation: Fog forms when water vapor condenses near the ground due to cool temperatures.
61. What is the process by which water seeps into the ground?
a) Evaporation
b) Condensation
c) Infiltration
d) Precipitation
✅ Answer: c) Infiltration
🔹 Explanation: Infiltration is the process where water from the surface moves downward into the soil and becomes groundwater.
62. Which factor increases the rate of evaporation?
a) High humidity
b) Cold temperature
c) Strong wind
d) Cloudy weather
✅ Answer: c) Strong wind
🔹 Explanation: Strong winds remove water vapor from the surface, making more water evaporate quickly.
63. What type of cloud brings heavy rain and thunderstorms?
a) Cirrus
b) Cumulonimbus
c) Stratus
d) Nimbostratus
✅ Answer: b) Cumulonimbus
🔹 Explanation: Cumulonimbus clouds are tall, dense, and associated with severe weather conditions like thunderstorms.
64. Why does it feel cooler when sweat evaporates from our skin?
a) It absorbs heat from the skin
b) It increases body temperature
c) It blocks sunlight
d) It makes the air drier
✅ Answer: a) It absorbs heat from the skin
🔹 Explanation: The process of evaporation takes heat away from the skin, causing a cooling effect.
65. Which layer of the atmosphere contains most of the water vapor?
a) Troposphere
b) Stratosphere
c) Mesosphere
d) Thermosphere
✅ Answer: a) Troposphere
🔹 Explanation: The troposphere is the lowest layer of the atmosphere and contains most of the Earth’s water vapor, leading to weather changes.
66. What happens to the temperature when water evaporates?
a) It decreases
b) It increases
c) It remains the same
d) It fluctuates
✅ Answer: a) It decreases
🔹 Explanation: Evaporation is a cooling process because it absorbs heat from the surrounding environment.
67. What do we call the water that collects in rivers, lakes, and oceans after precipitation?
a) Runoff
b) Groundwater
c) Condensation
d) Infiltration
✅ Answer: a) Runoff
🔹 Explanation: Runoff is the water that flows over the land and collects in bodies of water after precipitation.
68. What causes a rainbow to form after it rains?
a) Reflection and refraction of sunlight in water droplets
b) Evaporation of rainwater
c) Movement of wind
d) Condensation in the air
✅ Answer: a) Reflection and refraction of sunlight in water droplets
🔹 Explanation: A rainbow forms when sunlight bends (refracts) and reflects inside raindrops, splitting into different colors.
69. Why does morning dew disappear after sunrise?
a) It evaporates due to the heat from the sun
b) It freezes into ice
c) It turns into fog
d) It gets absorbed by the air
✅ Answer: a) It evaporates due to the heat from the sun
🔹 Explanation: As the sun rises, its heat causes the dew to evaporate into water vapor.
70. Which of the following processes removes salt from seawater?
a) Condensation
b) Evaporation
c) Precipitation
d) Transpiration
✅ Answer: b) Evaporation
🔹 Explanation: When seawater evaporates, only pure water turns into vapor, leaving the salt behind.
71. What happens to the rate of evaporation when humidity is high?
a) It increases
b) It decreases
c) It remains the same
d) It stops completely
✅ Answer: b) It decreases
🔹 Explanation: When the air is already full of water vapor (high humidity), the rate of evaporation slows down.
72. Which of these is an example of precipitation?
a) Fog forming in the morning
b) Water dripping from a melting ice cube
c) Rain falling from clouds
d) Steam rising from boiling water
✅ Answer: c) Rain falling from clouds
🔹 Explanation: Precipitation includes rain, snow, sleet, and hail, which fall from clouds to the Earth’s surface.
73. What causes clouds to form in the sky?
a) Condensation of water vapor
b) Melting of ice
c) Evaporation from lakes
d) Absorption of sunlight
✅ Answer: a) Condensation of water vapor
🔹 Explanation: When water vapor cools, it condenses into tiny droplets, forming clouds.
74. Which natural event is directly related to the water cycle?
a) Earthquakes
b) Volcanoes
c) Hurricanes
d) Landslides
✅ Answer: c) Hurricanes
🔹 Explanation: Hurricanes form due to the interaction of warm ocean water and evaporation, making them a part of the water cycle.
75. How does transpiration affect the water cycle?
a) It releases water vapor from plants into the air
b) It removes salt from seawater
c) It forms precipitation
d) It causes groundwater to dry up
✅ Answer: a) It releases water vapor from plants into the air
🔹 Explanation: Transpiration is the process where plants release water vapor through their leaves, adding moisture to the atmosphere.
76. What happens to rainwater that does not evaporate or soak into the ground?
a) It remains in the air
b) It turns into fog
c) It becomes runoff
d) It forms clouds
✅ Answer: c) It becomes runoff
🔹 Explanation: Rainwater that does not evaporate or infiltrate into the ground flows over the surface as runoff.
77. What is the main factor that drives the water cycle?
a) Gravity
b) The Moon’s gravity
c) The Sun’s heat
d) The Earth’s rotation
✅ Answer: c) The Sun’s heat
🔹 Explanation: The Sun provides energy for evaporation, which is the first step of the water cycle.
78. What do we call the process when water droplets in clouds join together and become too heavy to remain in the air?
a) Evaporation
b) Precipitation
c) Condensation
d) Transpiration
✅ Answer: b) Precipitation
🔹 Explanation: When water droplets grow large enough, they fall as rain, snow, or hail, a process called precipitation.
79. What is the effect of temperature on the rate of evaporation?
a) Higher temperatures increase evaporation
b) Lower temperatures increase evaporation
c) Temperature has no effect on evaporation
d) Evaporation only occurs at room temperature
✅ Answer: a) Higher temperatures increase evaporation
🔹 Explanation: Heat provides energy that speeds up the conversion of liquid water into water vapor.
80. Which of the following best describes the importance of the water cycle?
a) It cleans rivers and lakes
b) It ensures water is continuously available on Earth
c) It prevents evaporation from occurring
d) It only benefits ocean life
✅ Answer: b) It ensures water is continuously available on Earth
🔹 Explanation: The water cycle circulates water through different forms, ensuring a continuous supply of fresh water.
81. What is the primary reason clouds float in the sky?
a) They are made of solid ice
b) They are lighter than air
c) Rising warm air supports them
d) The wind pushes them up
✅ Answer: c) Rising warm air supports them
🔹 Explanation: Clouds form when warm, moist air rises, cools, and condenses, and they remain in the sky because the warm air keeps them aloft.
82. Which stage of the water cycle purifies water naturally?
a) Precipitation
b) Evaporation
c) Condensation
d) Runoff
✅ Answer: b) Evaporation
🔹 Explanation: During evaporation, impurities like salt and dirt are left behind, making the water vapor pure.
83. What kind of precipitation forms when raindrops freeze before reaching the ground?
a) Hail
b) Sleet
c) Snow
d) Dew
✅ Answer: b) Sleet
🔹 Explanation: Sleet forms when raindrops freeze as they pass through a cold air layer before reaching the ground.
84. Why do we see fog in the morning?
a) The air is too dry
b) Water vapor condenses near the ground
c) The ground absorbs all the moisture
d) The Sun stops evaporation
✅ Answer: b) Water vapor condenses near the ground
🔹 Explanation: Fog forms when warm, moist air near the ground cools down, causing water vapor to condense into tiny droplets.
85. What is the major role of trees in the water cycle?
a) They absorb all the water
b) They increase transpiration
c) They cause precipitation
d) They stop evaporation
✅ Answer: b) They increase transpiration
🔹 Explanation: Trees release water vapor into the air through transpiration, adding moisture to the atmosphere.
86. How does water return to the oceans after precipitation?
a) Through infiltration and runoff
b) By remaining in lakes permanently
c) By evaporating immediately
d) By turning into ice
✅ Answer: a) Through infiltration and runoff
🔹 Explanation: Rainwater infiltrates into the ground or flows over land as runoff, eventually reaching oceans.
87. What happens to water vapor when it reaches higher altitudes?
a) It condenses and forms clouds
b) It evaporates more quickly
c) It turns into ice instantly
d) It disappears
✅ Answer: a) It condenses and forms clouds
🔹 Explanation: At high altitudes, temperatures are lower, causing water vapor to condense into tiny droplets, forming clouds.
88. What is the process by which ice directly changes into water vapor?
a) Evaporation
b) Condensation
c) Sublimation
d) Freezing
✅ Answer: c) Sublimation
🔹 Explanation: Sublimation occurs when ice or snow changes directly into water vapor without first becoming liquid.
89. Why do puddles dry up after rain?
a) Water infiltrates underground
b) The wind absorbs the water
c) The Sun’s heat causes evaporation
d) Clouds pull the water up
✅ Answer: c) The Sun’s heat causes evaporation
🔹 Explanation: The Sun provides heat energy, which speeds up the evaporation of water from puddles.
90. What will happen if the water cycle stops?
a) There will be no changes
b) Water will remain in one form permanently
c) All living beings will run out of water
d) The Sun will stop shining
✅ Answer: c) All living beings will run out of water
🔹 Explanation: The water cycle ensures a continuous supply of fresh water; without it, all life would suffer from water shortages.
91. What is the main reason oceans do not dry up despite constant evaporation?
a) The water cycle replenishes them through precipitation
b) The Sun prevents evaporation
c) The oceans are too deep
d) Wind pushes water back into the ocean
✅ Answer: a) The water cycle replenishes them through precipitation
🔹 Explanation: Water that evaporates from the ocean returns as precipitation, maintaining the water balance.
92. What happens to the air temperature when condensation occurs?
a) It increases
b) It decreases
c) It remains unchanged
d) It fluctuates randomly
✅ Answer: b) It decreases
🔹 Explanation: Condensation releases heat into the surrounding air, causing the temperature to drop.
93. What is the primary reason clouds turn dark before a storm?
a) They contain too much oxygen
b) They become thick and block sunlight
c) They absorb heat from the Sun
d) They move closer to the ground
✅ Answer: b) They become thick and block sunlight
🔹 Explanation: Storm clouds are dense, preventing sunlight from passing through, making them appear dark.
94. Which of the following contributes to groundwater formation?
a) Evaporation
b) Condensation
c) Infiltration
d) Runoff
✅ Answer: c) Infiltration
🔹 Explanation: Water seeps into the soil and collects underground as groundwater.
95. Why does water vapor rise in the atmosphere?
a) It is pushed by the wind
b) It is heavier than air
c) Warm air rises, carrying water vapor
d) The Earth’s gravity pulls it up
✅ Answer: c) Warm air rises, carrying water vapor
🔹 Explanation: Warm air is less dense and rises, carrying water vapor that eventually condenses into clouds.
96. Which type of precipitation forms when raindrops freeze into ice pellets before hitting the ground?
a) Hail
b) Sleet
c) Snow
d) Drizzle
✅ Answer: b) Sleet
🔹 Explanation: Sleet forms when raindrops pass through a layer of freezing air before reaching the ground.
97. What happens to water that does not evaporate or infiltrate into the ground?
a) It turns into clouds
b) It becomes runoff and flows into rivers and oceans
c) It disappears into the air
d) It remains as solid ice
✅ Answer: b) It becomes runoff and flows into rivers and oceans
🔹 Explanation: Water that does not evaporate or infiltrate flows over land and collects in bodies of water.
98. Which process occurs when water vapor changes directly into ice without becoming liquid first?
a) Evaporation
b) Condensation
c) Deposition
d) Sublimation
✅ Answer: c) Deposition
🔹 Explanation: Deposition is when water vapor directly turns into ice, forming frost.
99. What determines the rate of evaporation?
a) Temperature, wind speed, and humidity
b) Only temperature
c) The size of water droplets
d) The number of trees in an area
✅ Answer: a) Temperature, wind speed, and humidity
🔹 Explanation: High temperature and wind increase evaporation, while high humidity slows it down.
100. Why does morning dew form on grass and leaves?
a) Water evaporates from the ground
b) Water vapor condenses on cool surfaces
c) Plants release water at night
d) The Sun heats the ground
✅ Answer: b) Water vapor condenses on cool surfaces
🔹 Explanation: At night, when temperatures drop, water vapor condenses on grass and leaves as dew.
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