MCQ on A Journey through States of Water Class 6
Class 6 Science Chapter 8 MCQ A Journey through States of Water
Multiple Choice Questions :
Question 1.
Which of the following activity does not involve use of water? NCERT Exemplar
(a) Washing clothes
(b) Bathing
(c) Cleaning utensils
(d) Drying wet clothes
Answer:
(d) Drying wet clothes
Question 2.
In which of the following activities will you use least amount of water?
(a) Bathing
(b) Brushing teeth
(c) Washing clothes
(d) Mopping a room
Answer:
(b) Brushing teeth
Question 3.
Which of the following is not a method of water conservation?
(a) Collecting and using rainwater for household chores.
(b) Fixing leaks in water pipes.
(c) Taking long showers.
(d) Using discarded AC water to water plants.
Answer:
(c) Taking long showers.
Question 4.
Why do you often see dew on the grass in the morning?
(a) Due to evaporation
(b) Due to condensation of water vapour
(c) Due to freezing of water
(d) Due to melting of ice
Answer:
(b) Due to condensation of water vapour
Question 5.
If you leave a wet towel outside on a sunny day, why does it dry faster?
(a) Due to condensation
(b) Due to evaporation
(c) Due to freezing
(d) None of these
Answer:
(b) Due to evaporation
Question 6.
Why do lakes and rivers often freeze over during very cold winters?
(a) Duę to the high evaporation rate
(b) Due to the high condensation rate
(c) Due to the decrease in temperature
(d) Due to the increase in humidity
Answer:
(c) Due to the decrease in temperature
Question 7.
What happens to the rate of evaporation when the temperature of the surrounding air increases?
(a) It decreases
(b) It increases
(c) It remains the same
(d) It stops
Answer:
(b) It increases
Question 8.
In which of the following case evaporation of water will be slowest? NCERT Exemplar
(a) A tray of water kept in sunlight.
(b) A kettle of water kept on a burner.
(c) A glass of water kept in a room.
(d) A bucket of water kept on rooftop.
Answer:
(c) A glass of water kept in a room.
Question 9.
If a container of water is left in a room where the temperature is 20° C but the humidity is very high, what happens to the rate of evaporation? Competency Based Que.
(a) It increases due to higher temperature.
(b) It decreases due to higher humidity.
(c) It remains the same regardless of humidity.
(d) It increases due to lower pressure.
Answer:
(b) It decreases due to higher humidity.
Question 10.
Why do people often feel cooler after taking a shower on a hot day?
(a) Due to the water in the shower heating up the skin
(b) Due to the evaporation of water from the skin
(c) Due to condensation of steam from the shower
(d) Due to increased humidity in the bathroom
Answer:
(b) Due to the evaporation of water from the skin
Question 11.
Transpiration is a process in which plants
(a) receive water from soil.
(c) prepare food from water.
(b) absorb water vapour from air.
(d) release water vapour into the air.
Answer:
(d) release water vapour into the air.
Question 12.
Why do plants in a garden, such as roses in a home garden, need to be watered regularly, especially during hot days?
(a) To prevent the soil from freezing
(b) To increase evaporation
(c) To replace the water lost through transpiration
(d) To promote condensation
Answer:
(c) To replace the water lost through transpiration
Question 13.
Clouds are
(a) tiny drops of water floating in air.
(c) particles of water vapour.
(b) mixture of dust and water vapour.
(d) rain drops in air.
Answer:
(a) tiny drops of water floating in air.
Question 14.
What do we call the water that falls from the sky as rain, snow or hail?
(a) Runoff
(b) Precipitation
(c) Condensation
(d) Evaporation
Answer:
(b) Precipitation
Question 15.
How does water in a lake eventually return to the oceans or seas?
(a) Through evaporation and precipitation
(b) By freezing and melting
(c) By condensation and infiltration
(d) Through filtration and purification
Answer:
(a) Through evaporation and precipitation
Question 16.
When you see dew on the car windows early in the morning, what process has occurred?
(a) Sublimation
(b) Melting
(c) Condensation
(d) Evaporation
Answer:
(c) Condensation
Question 17.
Why does water in a glass evaporate faster on a sunny day compared to a cloudy day?
(a) The glass becomes colder on sunny days.
(b) Sunlight increases the temperature, speeding up the evaporation process.
(c) The glass absorbs more water vapour on sunny days.
(d) The glass traps more water vapour on sunny days.
Answer:
(b) Sunlight increases the temperature, speeding up the evaporation process.
Question 18.
If a room is very humid, which of the following is most likely to occur?
(a) Faster evaporation of water
(b) Slower evaporation of water
(c) Faster condensation of water
(d) Slower condensation of water
Answer:
(b) Slower evaporation of water
Question 19.
Which of the following process is responsible for forming clouds in the sky?
(a) Evaporation
(b) Melting
(c) Condensation
(d) Freezing
Answer:
(c) Condensation
Fill in the Blanks :
1. Water in the ________ state has a fixed shape.
Answer:
solid
2. When we see water droplets on the outside of a cold glass of lemonade, it is due to the ________ of water vapour from the air.
Answer:
condensation
3. In a desert environment, high temperatures lead to high rates of ________ and can quickly dry up water sources.
Answer:
evaporation
4. In a ________ cycle, water changes its state between liquid, solid and gas, while moving through the environment.
Answer:
water
5. The water cycle consists of evaporation, condensation and ________
Answer:
precipitation
6. When water is heated, it changes from a ________ to gas.
Answer:
liquid
7. In the water cycle, ________ is the process where water from the ground turns into vapour and rises into the atmosphere.
Answer:
evaporation
True/False :
1. Water turns into water vapour when it is heated.
Answer:
True
2. Condensation is the process where water vapour turns into ice directly without becoming a liquid.
Answer:
False
3. Evaporation occurs faster in warm and dry conditions than in cold and humid conditions.
Answer:
True
4. Water kept in a shady place will not evaporate.
Answer:
False
5. In the water cycle, precipitation includes rain, snow and hail.
Answer:
True
6. Condensation is the process where water vapour changes into liquid water.
Answer:
True
7. Water in a closed container will never evaporate.
Answer:
False
Match the Columns :
1. Match the column I with column II.
| Column I | Column II |
| A. Solid ice to liquid water | 1. Condensation |
| B. Liquid water to water vapour | 2. Melting |
| C. Liquid water to solid ice | 3. Transpiration |
| D. Water vapour to Liquid water | 4. Evaporation |
| E. Liquid water to water vapour in plants | 5. Freezing |
Answer:
| Column I | Column II |
| A. Solid ice to liquid water | 2. Melting |
| B. Liquid water to water vapour | 4. Evaporation |
| C. Liquid water to solid ice | 5. Freezing |
| D. Water vapour to Liquid water | 1. Condensation |
| E. Liquid water to water vapour in plants | 3. Transpiration |
2. Match the Column I with Column II.
| Column I | Column II |
| A. Fixed shape and volume | 1. Water |
| B. Only fixed volume but no fixed shape | 2. Water vapour |
| C. Neither fixed shape nor volume | 3. Ice |
Answer:
| Column I | Column II |
| A. Fixed shape and volume | 3. Ice |
| B. Only fixed volume but no fixed shape | 1. Water |
| C. Neither fixed shape nor volume | 2. Water vapour |
Assertion-Reason :
The following questions consist of two statements. Assertion (A) and reason (R). Answer these questions selecting the appropriate option given below.
(a) Both A and R are true and R is the correct explanation of A .
(b) Both A and R are true but R is not the correct explanation of A .
(c) A is true but the R is false.
(d) A is false but the R is true.
1. Assertion (A) Steam forms water droplets on a cold surface.
Reason (R) Condensation happens when the water vapour loses heat and turns back into liquid.
Answer:
(a) Both A and R are true and the R is correct explanation of A .
2. Assertion (A) Evaporation can happen in a closed container.
Reason (R) In a closed container, the rate of evaporation is higher than in an open container.
Answer:
(c) A is true but the R is false. A can be corrected as: evaporation can happen in a closed container, but the rate will be slower than the evaporation taking place in an open container. This is because the vapour gets trapped and can’t escape, which reduces the driving force for more evaporation of to take place.
3. Assertion (A) Water in a pot left on a window under direct sunlight will evaporate and water in a shaded area will not evaporate.
Reason (R) Sunlight increases the temperature of the water which speeds up the evaporation process.
Answer:
(d) A is false but the R is true A can be corrected as even in the shaded area, the water is still exposed to the air, which allows water to evaporate.
4. Assertion (A) Plants lose water through their leaves in the form of water vapour.
Reason (R) This process is called transpiration, which helps in cooling the plant.
Answer:
(a) Both A and R are true and R is the correct explanation of A.
Case based Questions :
1. Read the given passage and answer the following questions.
One summer morning, Yogya was walking in the park and she saw a puddle full of water. She was curious about what would happen to it over the course of the day. Then, she visited the park again in the evening, and she noticed that the water level in the puddle had decreased significantly.
Question i.
What do you think caused the decrease in the water level If the puddle from morning to evening?
Answer:
Evaporation caused the decrease in the water level of the puddle from morning to evening
Question ii.
Where did the water go after it disappeared from the puddle?
Answer:
The water turned into vapour and went into the air.
Question iii.
How does the temperature affects the rate of water loss from the puddle.
Answer:
Higher temperatures increase the rate of evaporation. When it’s wammer, like during the afternoon, more water turns into vapour and escapes into the air.
2. Read the given passage and answer the following questions.
During a hot summer day, Riya goes for a jog and feels very warm. To cool down, she places a wet cloth around her neck. She notices that the cloth feels cooler as it drles. Riya wonders how this process works and why the wet cloth cools her down.
Question i.
Why does the wet cloth around Riya’s neck feel cooler as it dries?
(a) The water in the cloth heats up, making it feel cooler.
(b) The water evaporating from the cloth absorbs heat from her skin, making it feel cooler.
(c) The cloth absorbs heat from the environment, making the cloth feel colder.
(d) The cloth is made of special cooling material that lowers its temperature.
Answer:
(b) The water evaporating from the cloth absorbs heat from her skin, making it feel cooler.
Question ii.
What is the process called when water changes from a liquid to a gas and helps in cooling down objects?
(a) Melting
(b) Condensation
(c) Evaporation
(d) Sublimation
Answer:
(c) Evaporation
Question iii.
If Riya used a dry cloth instead of a wet one, how would it affect her cooling experience?
(a) The dry cloth would cool her down more effectively.
(b) The dry cloth would not provide any cooling effect.
(c) The dry cloth would make her feel warmer.
(d) The dry cloth would cool her down initially but warm up quickly.
Answer:
(b) The dry cloth would not provide any cooling effect.
Question iv.
If Riya had a fan blowing air across the wet cloth, how would it affect the cooling effect?
(a) The fan would decrease the rate of evaporation, making the cloth feel warmer.
(b) The fan would increase the rate of evaporation, making the cloth feel cooler.
(c) The fan would have no effect on the cooling effect of the wet cloth.
(d) The fan would make the wet cloth dryer, reducing the cooling effect.
Answer:
(b) The fan would increase the rate of evaporation, making the cloth feel cooler.
3. Read the given passage and answer the following questions.
In a small village, water is collected in traditional earthen pots known as matkas. These pots help keep the water to remain cool because of the natural cooling effect of the earthen material.
Why does water in a matka remain cooler compared to water in a metal container under the same conditions?
(a) The metal container absorbs more heat.
(b) The matka allows water to evaporate through its porous surface, which cools the water.
(c) The matka blocks sunlight better than a metal container.
(d) The metal container is insulated, so it does not lose heat.
Answer:
(b) The matka allows water to evaporate through its porous surface, which cools the water.