Get 100 multiple-choice questions (MCQs) with answers and explanations on Experiment with Water in Everyday Life for AISSEE Class 6. Enhance your preparation with detailed solutions covering water properties, evaporation, condensation, buoyancy, solubility, and the water cycle. Download the complete study material from Anand Classes to excel in your exams!
Here’s a set of 100 multiple-choice questions (MCQs) on “Experiment with Water in Everyday Life” for AISSEE Class 6, including answers and detailed explanations.
Experiment with Water in Everyday Life MCQs for All India Sainik Schools Entrance Examination (AISSEE)
1. What happens when you add salt to water?
A) It floats on water
B) It dissolves in water
C) It sinks without dissolving
D) It turns into ice
Answer: B) It dissolves in water
Explanation: Salt is soluble in water, meaning it dissolves to form a salt-water solution. This is an example of solubility.
2. What is the process called when water changes into water vapor?
A) Condensation
B) Evaporation
C) Freezing
D) Melting
Answer: B) Evaporation
Explanation: Evaporation is the process where liquid water turns into vapor due to heat. It occurs naturally from surfaces like lakes, rivers, and wet clothes.
3. What will happen if you put a coin and a piece of chalk in water?
A) Both will float
B) Both will sink
C) The coin will float, and the chalk will sink
D) The coin will sink, and the chalk may dissolve slowly
Answer: D) The coin will sink, and the chalk may dissolve slowly
Explanation: The coin is made of metal and sinks due to its density. Chalk, made of calcium carbonate, also sinks but can dissolve slightly over time in water.
4. Which of the following will float in water?
A) Iron nail
B) Wooden stick
C) Stone
D) Marble
Answer: B) Wooden stick
Explanation: Objects that are less dense than water, like wood, float on the surface. Heavier and denser objects, such as stones and metals, sink.
5. Why do oil and water not mix?
A) Oil is heavier than water
B) Oil is lighter than water
C) Oil is immiscible in water
D) Oil evaporates quickly
Answer: C) Oil is immiscible in water
Explanation: Oil and water do not mix because oil molecules are hydrophobic (repel water) and less dense, so they form a separate layer on the surface.
6. What happens when sugar is added to water?
A) It settles at the bottom
B) It floats on the surface
C) It dissolves completely
D) It changes color
Answer: C) It dissolves completely
Explanation: Sugar is soluble in water, meaning it dissolves and forms a solution. This is an example of solubility.
7. What is the process of water turning into ice called?
A) Evaporation
B) Melting
C) Freezing
D) Boiling
Answer: C) Freezing
Explanation: Freezing is the process where liquid water turns into solid ice at temperatures below 0°C.
8. Which of the following is an example of condensation?
A) Steam forming on a bathroom mirror
B) Ice melting into water
C) Water boiling in a pot
D) Clothes drying in the sun
Answer: A) Steam forming on a bathroom mirror
Explanation: Condensation is the process of water vapor cooling and turning into liquid droplets, such as steam forming on a mirror.
9. What happens when we heat water in a kettle?
A) It turns into ice
B) It remains the same
C) It evaporates into steam
D) It becomes heavier
Answer: C) It evaporates into steam
Explanation: When heated, water molecules move faster and turn into steam (water vapor), a process called evaporation.
10. What will happen if you put a sponge in water?
A) It will sink immediately
B) It will absorb water and then sink
C) It will float without absorbing water
D) It will dissolve in water
Answer: B) It will absorb water and then sink
Explanation: A sponge has tiny pores that absorb water. When fully saturated, it becomes heavier and may sink.
11. What happens when we put an ice cube in a glass of water?
A) It sinks immediately
B) It floats and slowly melts
C) It dissolves in water
D) It remains unchanged
Answer: B) It floats and slowly melts
Explanation: Ice is less dense than liquid water, so it floats. Over time, it melts due to the surrounding temperature.
12. Which factor affects the rate of evaporation of water?
A) Temperature
B) Surface area
C) Wind speed
D) All of the above
Answer: D) All of the above
Explanation: Higher temperatures, larger surface areas, and increased wind speed all speed up evaporation.
13. What happens when water vapor cools down?
A) It remains as vapor
B) It condenses into liquid water
C) It turns into solid ice
D) It disappears completely
Answer: B) It condenses into liquid water
Explanation: When water vapor cools, it condenses into tiny droplets, forming clouds, fog, or dew.
14. Which of the following substances is insoluble in water?
A) Sugar
B) Salt
C) Sand
D) Baking soda
Answer: C) Sand
Explanation: Sand does not dissolve in water and instead settles at the bottom.
15. Why does a paper boat float on water?
A) It is lighter than water
B) It has air trapped inside
C) It has a special coating
D) Water repels paper
Answer: A) It is lighter than water
Explanation: A paper boat is less dense than water, allowing it to float. However, if it absorbs water, it may eventually sink.
16. Why does warm water evaporate faster than cold water?
A) Warm water is lighter
B) Warm water has more energy
C) Warm water contains fewer impurities
D) Warm water is denser
Answer: B) Warm water has more energy
Explanation: Higher temperature increases the kinetic energy of water molecules, allowing them to escape into the air as vapor more quickly.
17. What happens when we mix oil and water?
A) Oil dissolves in water
B) Water dissolves in oil
C) They form separate layers
D) They become a uniform mixture
Answer: C) They form separate layers
Explanation: Oil and water are immiscible; oil is less dense and floats on top of water instead of mixing with it.
18. What process causes the formation of dew on grass in the early morning?
A) Evaporation
B) Condensation
C) Freezing
D) Sublimation
Answer: B) Condensation
Explanation: When warm air cools down overnight, water vapor condenses into liquid droplets, forming dew on grass.
19. Which of the following will not dissolve in water?
A) Sugar
B) Salt
C) Sand
D) Lemon juice
Answer: C) Sand
Explanation: Sand is insoluble in water; it settles at the bottom rather than dissolving.
20. What happens to water when it reaches 100°C?
A) It condenses
B) It turns into ice
C) It evaporates into steam
D) It remains unchanged
Answer: C) It evaporates into steam
Explanation: At 100°C, water reaches its boiling point and changes from liquid to gaseous form (steam).
21. What happens when we place a dry sponge in water?
A) It dissolves in water
B) It absorbs water and becomes heavy
C) It floats on the surface without absorbing water
D) It changes color
Answer: B) It absorbs water and becomes heavy
Explanation: A sponge has small pores that allow it to absorb water, increasing its weight.
22. Why do some objects float on water while others sink?
A) Because of their weight
B) Due to their shape
C) Because of their density
D) Due to water temperature
Answer: C) Because of their density
Explanation: Objects with lower density than water float, while those with higher density sink.
23. What is the boiling point of water at sea level?
A) 50°C
B) 100°C
C) 150°C
D) 200°C
Answer: B) 100°C
Explanation: Water boils at 100°C under normal atmospheric pressure at sea level.
24. What happens when we add soap to water?
A) It dissolves and forms lather
B) It remains unchanged
C) It sinks to the bottom
D) It makes water heavier
Answer: A) It dissolves and forms lather
Explanation: Soap is soluble in water and reduces surface tension, forming bubbles and lather.
25. Which of the following is an example of water changing states?
A) Ice melting into water
B) Water boiling into steam
C) Water freezing into ice
D) All of the above
Answer: D) All of the above
Explanation: Water can change states between solid, liquid, and gas through melting, boiling, and freezing.
26. What happens when salt is added to water?
A) It sinks to the bottom
B) It dissolves in water
C) It forms a separate layer
D) It floats on the surface
Answer: B) It dissolves in water
Explanation: Salt is soluble in water, meaning it mixes completely to form a solution.
27. What is the freezing point of pure water?
A) 0°C
B) 25°C
C) 50°C
D) -10°C
Answer: A) 0°C
Explanation: Water freezes at 0°C under normal atmospheric pressure.
28. What is the process of converting water vapor directly into ice called?
A) Evaporation
B) Condensation
C) Freezing
D) Deposition
Answer: D) Deposition
Explanation: Deposition is when water vapor turns directly into ice without passing through the liquid state.
29. Which of the following liquids is immiscible with water?
A) Milk
B) Vinegar
C) Oil
D) Alcohol
Answer: C) Oil
Explanation: Oil does not mix with water because it is non-polar, forming a separate layer on the surface.
30. Which of the following is NOT a property of water?
A) It has a definite shape
B) It is a universal solvent
C) It exists in three states
D) It has surface tension
Answer: A) It has a definite shape
Explanation: Water is a liquid and takes the shape of its container, unlike solids that have a definite shape.
31. Why does ice float on water?
A) Ice is heavier than water
B) Ice has more salt content
C) Ice is less dense than water
D) Ice absorbs water
Answer: C) Ice is less dense than water
Explanation: Ice has a lower density than liquid water due to the arrangement of water molecules in a crystalline structure, making it float.
32. What happens when we place a glass of water in a freezer?
A) It turns into gas
B) It turns into ice
C) It evaporates
D) It remains the same
Answer: B) It turns into ice
Explanation: When water is cooled below 0°C, it freezes and turns into solid ice.
33. Which of the following will dissolve in water?
A) Sand
B) Oil
C) Sugar
D) Plastic
Answer: C) Sugar
Explanation: Sugar is soluble in water and dissolves completely, forming a solution.
34. What happens when we heat water to 100°C?
A) It freezes
B) It remains the same
C) It evaporates into steam
D) It condenses
Answer: C) It evaporates into steam
Explanation: At 100°C, water reaches its boiling point and turns into vapor.
35. What is the main cause of water evaporation from oceans?
A) Gravity
B) Wind
C) Sun’s heat
D) Rain
Answer: C) Sun’s heat
Explanation: The sun’s heat provides energy for water molecules to escape as vapor, leading to evaporation.
36. What happens when we sprinkle salt on ice?
A) Ice melts faster
B) Ice becomes harder
C) Ice turns into vapor
D) Ice does not change
Answer: A) Ice melts faster
Explanation: Salt lowers the freezing point of water, causing ice to melt more quickly.
37. What process is responsible for cloud formation?
A) Freezing
B) Evaporation
C) Condensation
D) Sublimation
Answer: C) Condensation
Explanation: Water vapor cools and condenses into tiny droplets, forming clouds.
38. Which property of water allows it to rise in narrow tubes against gravity?
A) Density
B) Surface tension
C) Capillary action
D) Buoyancy
Answer: C) Capillary action
Explanation: Water molecules cling to the walls of a narrow tube and pull other molecules up due to adhesion and cohesion forces.
39. What happens when water is heated in a sealed container?
A) It evaporates completely
B) It expands and creates pressure
C) It turns into ice
D) It remains the same
Answer: B) It expands and creates pressure
Explanation: Water vaporizes and expands, increasing pressure inside the sealed container, which can cause it to burst.
40. Why do wet clothes dry faster on a windy day?
A) Wind increases evaporation
B) Wind removes moisture from the air
C) Wind absorbs water
D) Wind lowers the boiling point of water
Answer: A) Wind increases evaporation
Explanation: Moving air carries away evaporated water molecules, speeding up the drying process.
41. What happens when a drop of ink is added to a glass of water?
A) It sinks to the bottom
B) It dissolves and spreads throughout the water
C) It floats on the surface
D) It forms a separate layer
Answer: B) It dissolves and spreads throughout the water
Explanation: Ink is soluble in water and diffuses evenly throughout the liquid due to the process of diffusion.
42. What process is responsible for the formation of fog?
A) Evaporation
B) Condensation
C) Freezing
D) Sublimation
Answer: B) Condensation
Explanation: Fog forms when water vapor cools and condenses into tiny liquid droplets suspended in the air.
43. Which of the following liquids is the best solvent?
A) Oil
B) Vinegar
C) Water
D) Alcohol
Answer: C) Water
Explanation: Water is known as the universal solvent because it can dissolve more substances than any other liquid.
44. Why does a steel needle sink in water while a large wooden log floats?
A) Steel is lighter than water
B) Wood is heavier than steel
C) Wood has less density than water, and steel has higher density
D) Water repels steel
Answer: C) Wood has less density than water, and steel has higher density
Explanation: Objects with a density lower than water float, while those with higher density sink.
45. What happens to water pressure as depth increases?
A) It decreases
B) It remains the same
C) It increases
D) It disappears
Answer: C) It increases
Explanation: Water pressure increases with depth because of the weight of the water above pushing down.
46. What happens when water is boiled for a long time?
A) It turns into ice
B) It remains unchanged
C) It completely evaporates
D) It becomes heavier
Answer: C) It completely evaporates
Explanation: Boiling water continuously causes it to evaporate as steam, eventually leaving no liquid behind.
47. What is the scientific term for the process of water seeping into the ground?
A) Evaporation
B) Condensation
C) Infiltration
D) Freezing
Answer: C) Infiltration
Explanation: Infiltration is the process by which water soaks into the soil and moves underground.
48. Which factor increases the rate of evaporation?
A) Decreasing temperature
B) High humidity
C) Increasing surface area
D) Covering the container
Answer: C) Increasing surface area
Explanation: A larger surface area allows more water molecules to escape into the air, increasing the rate of evaporation.
49. What happens to a wet handkerchief when placed under the sun?
A) It absorbs more water
B) It gets heavier
C) It dries up due to evaporation
D) It turns into ice
Answer: C) It dries up due to evaporation
Explanation: Heat from the sun increases the kinetic energy of water molecules, causing them to evaporate.
50. What causes rain to fall from clouds?
A) Condensation
B) Precipitation
C) Evaporation
D) Filtration
Answer: B) Precipitation
Explanation: When water droplets in clouds combine and grow heavy, they fall as precipitation in the form of rain, snow, or hail.
51. What happens to water when it is left open in a bowl for several days?
A) It freezes
B) It evaporates gradually
C) It turns into ice
D) It remains unchanged
Answer: B) It evaporates gradually
Explanation: Water left in an open container slowly evaporates due to heat and air movement.
52. What do we call the continuous movement of water between the earth and atmosphere?
A) Water storage
B) Water filtration
C) Water cycle
D) Water condensation
Answer: C) Water cycle
Explanation: The water cycle involves evaporation, condensation, and precipitation, maintaining the movement of water on Earth.
53. What will happen if a glass of cold water is kept in a warm room?
A) The water level will increase
B) Water will turn into ice
C) Water droplets will form on the outside of the glass
D) Nothing will happen
Answer: C) Water droplets will form on the outside of the glass
Explanation: This happens due to condensation when warm air around the glass cools and water vapor turns into liquid droplets.
54. Which of these factors can slow down evaporation?
A) Increasing temperature
B) Blowing wind
C) Increasing humidity
D) Increasing surface area
Answer: C) Increasing humidity
Explanation: High humidity means there is already a lot of water vapor in the air, reducing the rate of evaporation.
55. Why do ice cubes melt faster in warm water than in cold water?
A) Warm water has more energy
B) Warm water is heavier
C) Cold water dissolves ice faster
D) Ice repels cold water
Answer: A) Warm water has more energy
Explanation: Heat energy from warm water transfers to the ice cube, causing it to melt faster.
56. Why does saltwater take longer to freeze than freshwater?
A) Saltwater is heavier
B) Salt lowers the freezing point of water
C) Freshwater is colder than saltwater
D) Salt turns into ice first
Answer: B) Salt lowers the freezing point of water
Explanation: The presence of salt in water disrupts the formation of ice crystals, making it freeze at a lower temperature than freshwater.
57. What happens to water when it is cooled below 0°C?
A) It evaporates
B) It condenses
C) It freezes into ice
D) It turns into vapor
Answer: C) It freezes into ice
Explanation: When water reaches 0°C or lower, it changes into a solid state, forming ice.
58. What is the term for water turning directly from a solid to a gas?
A) Evaporation
B) Condensation
C) Sublimation
D) Freezing
Answer: C) Sublimation
Explanation: Sublimation is the process where a solid, like ice, changes directly into vapor without becoming liquid.
59. Why does a hot cup of tea produce steam?
A) Water is disappearing
B) The tea is dissolving in air
C) Water is evaporating into vapor
D) The tea is cooling down
Answer: C) Water is evaporating into vapor
Explanation: The heat from the tea increases the kinetic energy of water molecules, causing them to escape as steam.
60. Why do wet clothes dry faster under the sun than in the shade?
A) The sun’s heat speeds up evaporation
B) The shade absorbs moisture
C) Water molecules stop moving in the shade
D) Clothes absorb sunlight
Answer: A) The sun’s heat speeds up evaporation
Explanation: Heat from the sun increases the rate of evaporation, causing water to turn into vapor more quickly.
61. What happens when you stir sugar into water?
A) It sinks to the bottom
B) It floats on top
C) It dissolves in water
D) It forms layers
Answer: C) It dissolves in water
Explanation: Sugar is soluble in water, meaning it spreads evenly and disappears to form a solution.
62. What process causes morning dew to form on grass?
A) Evaporation
B) Condensation
C) Freezing
D) Sublimation
Answer: B) Condensation
Explanation: Dew forms when warm air containing moisture cools down, causing water vapor to condense into liquid droplets.
63. Why does water in a clay pot stay cooler than in a plastic bottle?
A) Clay absorbs heat
B) Clay allows water to evaporate
C) Plastic attracts heat
D) Plastic freezes water
Answer: B) Clay allows water to evaporate
Explanation: The porous nature of clay allows slow evaporation, which cools the remaining water.
64. Why do fish survive in frozen lakes?
A) Ice floats, keeping water below liquid
B) Fish stop breathing
C) Fish freeze and thaw later
D) Ice absorbs all oxygen
Answer: A) Ice floats, keeping water below liquid
Explanation: Ice is less dense and floats, forming an insulating layer that prevents the entire lake from freezing, allowing fish to survive in the liquid water below.
65. What happens when you put a dry paper towel in water?
A) It remains dry
B) It repels water
C) It absorbs water
D) It dissolves instantly
Answer: C) It absorbs water
Explanation: Paper towels have tiny spaces that allow water to be absorbed through capillary action.
66. What happens when a metal spoon is left in hot water?
A) It gets colder
B) It dissolves in water
C) It becomes hot
D) It floats on water
Answer: C) It becomes hot
Explanation: Heat is transferred from hot water to the metal spoon by conduction, making the spoon hot.
67. Which process turns water into tiny droplets in the air?
A) Evaporation
B) Condensation
C) Freezing
D) Sublimation
Answer: B) Condensation
Explanation: Condensation occurs when warm water vapor cools down and forms tiny liquid droplets.
68. Why does ice feel cold to the touch?
A) It gives heat to our hand
B) It absorbs heat from our hand
C) It has no temperature
D) It generates cold
Answer: B) It absorbs heat from our hand
Explanation: Ice absorbs heat from our skin, causing a cooling sensation.
69. What will happen if you place a paper boat on water?
A) It will sink immediately
B) It will dissolve
C) It will float
D) It will evaporate
Answer: C) It will float
Explanation: Paper is less dense than water, so it floats. However, if it absorbs too much water, it may sink.
70. Why do water droplets form on the outside of a cold bottle?
A) Water is leaking from inside
B) The bottle is sweating
C) Water vapor in the air condenses on the cold surface
D) The bottle absorbs moisture from the table
Answer: C) Water vapor in the air condenses on the cold surface
Explanation: When warm air touches a cold surface, the water vapor cools and turns into liquid droplets.
71. What happens when you blow air over a spoonful of hot soup?
A) The soup gets hotter
B) The soup evaporates faster
C) The soup turns into ice
D) The soup remains unchanged
Answer: B) The soup evaporates faster
Explanation: Blowing air increases the rate of evaporation, which cools the soup more quickly.
72. What happens when a dry sponge is placed in water?
A) It floats forever
B) It absorbs water and may sink
C) It dissolves completely
D) It repels water
Answer: B) It absorbs water and may sink
Explanation: A sponge has small holes that allow it to absorb water. If fully soaked, it can become heavy and sink.
73. What is the term for water changing from liquid to gas?
A) Condensation
B) Evaporation
C) Freezing
D) Precipitation
Answer: B) Evaporation
Explanation: Evaporation is the process where water turns into vapor due to heat.
74. Why do water droplets appear on the inside of a car window during winter?
A) Evaporation
B) Condensation
C) Freezing
D) Sublimation
Answer: B) Condensation
Explanation: Warm air inside the car contains moisture, which cools down on the cold glass, forming droplets.
75. Which of the following dissolves in water?
A) Wood
B) Plastic
C) Sugar
D) Stone
Answer: C) Sugar
Explanation: Sugar is soluble in water and dissolves completely, forming a solution.
76. What happens when an ice cube is placed in warm water?
A) It remains solid
B) It sinks to the bottom
C) It melts faster
D) It turns into vapor instantly
Answer: C) It melts faster
Explanation: Heat from the warm water transfers to the ice, increasing its melting rate.
77. Why does oil form a separate layer when mixed with water?
A) Oil is denser than water
B) Oil is immiscible in water
C) Oil dissolves faster
D) Oil reacts with water
Answer: B) Oil is immiscible in water
Explanation: Oil and water do not mix because oil is non-polar and does not dissolve in water, which is polar.
78. What is the main source of water on Earth?
A) Rivers
B) Lakes
C) Oceans
D) Wells
Answer: C) Oceans
Explanation: Oceans contain about 97% of Earth’s water, making them the largest source.
79. What happens when a glass of water is exposed to sunlight for a few hours?
A) Water evaporates
B) Water turns into ice
C) Water level rises
D) Water becomes heavier
Answer: A) Water evaporates
Explanation: Sunlight provides heat, causing water molecules to gain energy and escape as vapor.
80. What do we call the process of water changing from gas to liquid?
A) Evaporation
B) Condensation
C) Freezing
D) Filtration
Answer: B) Condensation
Explanation: Condensation occurs when water vapor cools and changes into liquid form, such as forming dew.
81. What happens when salt is added to boiling water?
A) The boiling point decreases
B) The boiling point increases
C) The water turns into ice
D) The water stops boiling
Answer: B) The boiling point increases
Explanation: Adding salt to water raises its boiling point, making it boil at a higher temperature.
82. What is the process of water passing through the soil to reach underground water sources called?
A) Evaporation
B) Filtration
C) Infiltration
D) Condensation
Answer: C) Infiltration
Explanation: Infiltration is the process where water seeps into the ground and replenishes groundwater sources.
83. What happens to the water level when ice melts in a glass of water?
A) It increases
B) It decreases
C) It remains the same
D) It overflows
Answer: C) It remains the same
Explanation: Ice displaces the same amount of water as its melted form, so the water level does not change.
84. Which process is responsible for the formation of frost?
A) Evaporation
B) Condensation
C) Freezing
D) Sublimation
Answer: C) Freezing
Explanation: Frost forms when water vapor in the air turns directly into ice without becoming liquid first.
85. What causes water to rise in a thin straw placed in a glass of water?
A) Surface tension
B) Gravity
C) Capillary action
D) Evaporation
Answer: C) Capillary action
Explanation: Capillary action allows water to move against gravity due to adhesive and cohesive forces.
86. What happens to wet clothes when they are left outside on a sunny day?
A) They become wetter
B) They dry due to evaporation
C) They turn into ice
D) They dissolve in air
Answer: B) They dry due to evaporation
Explanation: Heat from the sun increases the evaporation rate, causing water to turn into vapor and dry the clothes.
87. What is the main source of freshwater on Earth?
A) Oceans
B) Rivers and lakes
C) Underground oil reserves
D) Volcanic eruptions
Answer: B) Rivers and lakes
Explanation: Rivers, lakes, and groundwater are primary sources of freshwater, as ocean water is salty and not directly drinkable.
88. What happens when we heat ice?
A) It turns into water
B) It evaporates instantly
C) It remains unchanged
D) It turns into salt
Answer: A) It turns into water
Explanation: Heating ice increases molecular motion, causing it to melt and change into liquid water.
89. What will happen if you pour hot water into a glass bottle and immediately seal it tightly?
A) The bottle will break due to pressure
B) The water will freeze
C) The water level will decrease
D) Nothing will happen
Answer: A) The bottle will break due to pressure
Explanation: Hot water produces steam, increasing internal pressure, which may cause the bottle to burst if tightly sealed.
90. Why do raindrops appear spherical in shape?
A) Due to evaporation
B) Due to surface tension
C) Due to condensation
D) Due to gravity
Answer: B) Due to surface tension
Explanation: Surface tension causes water molecules to pull together, forming spherical droplets.
91. What happens when water is cooled below 0°C?
A) It turns into ice
B) It evaporates
C) It remains liquid
D) It turns into steam
Answer: A) It turns into ice
Explanation: Water freezes and changes into solid ice at 0°C or below due to the decrease in temperature.
92. What is the process of removing impurities from water called?
A) Evaporation
B) Filtration
C) Condensation
D) Freezing
Answer: B) Filtration
Explanation: Filtration is the process of removing impurities and solid particles from water using filters or other methods.
93. Why does hot water cool down when left in an open cup?
A) It absorbs heat
B) It undergoes condensation
C) It loses heat to the surroundings
D) It turns into ice
Answer: C) It loses heat to the surroundings
Explanation: Heat from hot water is transferred to the surrounding air, causing it to cool over time.
94. Why do icebergs float in the ocean?
A) Ice is denser than seawater
B) Ice is lighter than seawater
C) Ice absorbs salt
D) Ice does not mix with water
Answer: B) Ice is lighter than seawater
Explanation: Ice is less dense than liquid water, which makes it float on the ocean’s surface.
95. What happens when we place a metal spoon in boiling water?
A) It remains cold
B) It dissolves
C) It heats up quickly
D) It floats
Answer: C) It heats up quickly
Explanation: Metal is a good conductor of heat, so it quickly absorbs heat from boiling water.
96. What causes water to flow in rivers and streams?
A) Gravity
B) Wind
C) Surface tension
D) Evaporation
Answer: A) Gravity
Explanation: Gravity pulls water downhill, causing it to flow in rivers and streams towards larger water bodies.
97. Why does warm air hold more moisture than cold air?
A) Warm air has more space between molecules
B) Cold air attracts water
C) Cold air dissolves water
D) Warm air repels water
Answer: A) Warm air has more space between molecules
Explanation: Warm air expands, allowing more water vapor to be stored compared to cold air.
98. What is the term for the movement of water through plants from roots to leaves?
A) Evaporation
B) Condensation
C) Transpiration
D) Freezing
Answer: C) Transpiration
Explanation: Transpiration is the process by which water moves through plants and evaporates from leaves.
99. What happens when water is poured on a hot metal surface?
A) It instantly evaporates
B) It turns into ice
C) It dissolves metal
D) It remains unchanged
Answer: A) It instantly evaporates
Explanation: The heat from the metal causes the water to vaporize quickly due to rapid temperature rise.
100. What is the largest source of water vapor in the atmosphere?
A) Lakes
B) Oceans
C) Glaciers
D) Underground water
Answer: B) Oceans
Explanation: Oceans cover most of the Earth’s surface and provide the majority of water vapor through evaporation.
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