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
Choose the correct option:
Question 1.
The process of conversion of water into vapours is called ______
(a) transpiration
(b) evaporation
(c) condensation
(d) all of these
Answer:
(b) evaporation
Question 2.
In how many states of matter does water exist?
(a) One
(b) Two
(c) Three
(d) Four
Answer:
(c) Three
Question 3.
Condensation is the process in which ______
(a) water converts into vapours
(b) water converts into ice
(c) vapours convert into water
(d) all of these
Answer:
(c) vapours convert into water
Question 4.
The clothes dry in the sunlight by the process of ______
(a) condensation
(b) evaporation
(c) drought
(d) transpiration
Answer:
(b) evaporation
Question 5.
Steam rising from wet clothes while they are ironed is the example of
(a) evaporation
(b) condensation
(c) boiling
(d) melting
Answer:
(a) evaporation
Question 6.
The process of conversion of solid to liquid state by heating is
(a) freezing
(b) evaporation
(c) melting
(d) condensation
Answer:
(c) melting
Question 7.
Which of these is responsible for the formation of clouds?
(a) Conservation
(b) Respiration
(c) Condensation
(d) Evaporation
Answer:
(c) Condensation
Question 8.
Evaporation of water in the water bodies is due to the heat of
(a) sun
(b) moon
(c) star
(d) none
Answer:
(a) sun
Question 9.
The glasses of spectacles become foggy when we breathe out on glasses. This is because
(a) water droplets from our mouth gets evaporated on the glasses
(b) water vapour from our mouth gets condensed on the glasses
(c) water gets freezed on the glasses
(d) none of these
Answer:
(b) water vapour from our mouth gets condensed on the glasses
Question 10.
When we spread our clothes in the sun, the water
(a) condensates
(b) evaporates
(c) melts
(d) none of these
Answer:
(b) evaporates
Question 11.
During summer, water kept in an earthen pot becomes cool because of the phenomenon of
(a) Transpiration
(b) Evaporation
(c) Transpiration
(d) Condensation
Answer:
(b) Evaporation
Question 12.
Which condition qut of the following will increase the evaporation of water?
(a) Increase in temperature of water
(b) Decrease in transpiration of water
(c) Less exposed surface area of water
(d) Adding common salt to water.
Answer:
(a) Increase in temperature of water
Question 13.
The process of conversion of water into vapours is called
(a) Transpiration
(b) Evaporation
(c) Condensation
(d) Freezing
Answer:
(b) Evaporation
Question 14.
Condensation is the process in which :
(a) Water converts into vapours
(b) Water converts into ice
(c) Vapours convert into water
(d) All of the above
Answer:
(c) Vapours convert into water
Question 15.
The process by which rain water changes into snow is called :
(a) Melting
(b) Evaporation
(c) Condensation
(d) Freezing
Answer:
(d) Freezing
Question 16.
Some water in a plate is placed near a window. After sometime, the water disappears. This is because water has turned into:
(a) Vapour
(b) Steam
(c) Solution
(d) Dew
Answer:
(a) Vapour
Question 17.
The loss of water from the leaves of plants as water vapour through the stomata is called :
(a) Translocation
(b) Transpirtion
(c) Respiration
(d) Evaporation
Answer:
(b) Transpirtion
Question 18.
During evaporation, the heat is :
(a) Absorbed
(b) Evolved
(c) First absorbed then evolved
(d) Initially evolved and then absorbed
Answer:
(a) Absorbed
Question 19.
Evaporation is called as:
(a) Surface phenomenon
(b) Bulk phenomenon
(c) Both surface and bulk phenomenon
(d) Unique phenomenon
Answer:
(a) Surface phenomenon
Question 20.
Evaporation of a liquid takes place at :
(a) A fixed temperature lower than its boiling point
(b) A fixed temperature higher than – its boiling point
(c) A fixed temperature and pressure
(d) All temperatures
Answer:
(d) All temperatures
Assertion-Reason Type Questions
Directions (Q. No. 1. to 5): The question below consists of an Assertion (A) and a Reason (R).
Use the following key to choose the appropriate answer.
(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 R is false
(d) A is false but R is true
Question 1.
Assertion (A): Dew drops are formed on leaves of plants in early morning.
Reason (R): Warm air in the surrounding gets condensed on cooling.
Answer:
(a) Both A and R are true and R is the correct explanation of A.
Question 2.
Assertion (A): Ice-cream kept outside the refrigerator gets melted.
Reason (R): The process of melting involves cooling.
Answer:
(c) A is true but R is false.
Question 3.
Assertion (A): Evaporation takes place faster in rainy days as compared to in sunny days.
Reason (R): More the humidity lower is the rate of evaporation,
Answer:
(d) A is false but R is true.
Question 4.
Assertion (A): More is the humidity, water evaporates faster.
Reason (R): Humidity is the amount of water in the air.
Answer:
(d) A is false but R is true
Question 5.
Assertion (A): The water in the earthen pot remains cool than that kept in plastic bottle.
Reason (R): Condensation is the process of conversion of water vapours to liquid on cooling.
Answer:
(b) Both A and R are true but R is not the correct explanation of A
Given below are two statements, one labelled as Assertion (A) and the other labelled as Reason (R).
(a) Both (A) and (R) are true and (R) is the correct explanation of (A).
(b) Both (A) and (R) are true and (R) is not the correct explanation of (A).
(c) (A) is true but (R) is false.
(d) (A) is false but (R) is true.
Question 1.
Assertion (A) : Evaporation causes cooling.
Reason (R) : When a liquid evaporates it draws heat from the surface which it touches.
Answer:
(a) Both (A) and (R) are true and (R) is the correct explanation of (A).
Question 2.
Assertion (A) : Water in oceans, seas, rivers, leaves, ponds and wet bodies continue to evaporate.
Reason (R) : Evaporation is a slow process.
Answer:
(b) Both (A) and (R) are true and (R) is not the correct explanation of (A).
Question 3.
Assertion (A) : Evaporation causes cooling effect.
Reason (R) : During evaporation, heat is absorbed from the surroundings.
Answer:
(a) Both (A) and (R) are true and (R) is the correct explanation of (A).
Question 4.
Assertion (A): Evaporation is the reverse of condensatien.
Reason (R) : The process of evaporation is involved in bringing back water to the surface of the earth in the form of rain.
Answer:
(c) (A) is true but (R) is false.
Question 5.
Assertion (A) : Condensation causes cooling effect.
Reason (R) : Water changes its state in heating or cooling.
Answer:
(d) (A) is false but (R) is true.
Fill in The Blanks
Complete the following with a suitable word/words:
1. Water is ________ for life.
Answer:
essential
2. The circulation of water between ocean and land is known as _______.
Answer:
water cycle
3. In our country, most of the rainfall occurs during the _______ season.
Answer:
monsoon
4. Most of water becomes available to us as
Answer:
groundwater
5. Dew is found on leaves of grass on _______.
Answer:
winter morning
6. Water cycle helps in regulating the _______ on the earth.
Answer:
weather
7. Tiny drops of water arc called _______.
Answer:
water droplets
8. Water vapours enter the air through the process of ________.
Answer:
evaporation
9. _______ is a source for many lakes and hand pumps.
Answer:
Groundwater
10. Humidity is the amount of______ in air.
Answer:
Water vapour
11. The process of changing water vapour into water is called_______.
Answer:
Condensation
12. The continuous movement of water from the earth to atmosphere and back to the earth is called _______.
Answer:
Solids
13. _______have a definite shape and distinct boundaries.
Answer:
Water cycle
14. _______do not have a fixed shape but have a fixed volume.
Answer:
Liquids
15. _______neither have a definite shape nor a definite volume.
Answer:
Gases
16. The phenomenon of change of a liquid into vapours at any temperature below its boiling point is called _______.
Answer:
Evaporation
17. Evaporation of a liquid occurs at a_______rate in summer than in winter.
Answer:
Faster
18. The circulation of water between the earth surface and atmosphere is known as_______.
Answer:
Water cycle
19. _______causes cooling effect.
Answer:
Evaporation
20. On hot sunny days, water evaporating from the leaves of the trees the surrounding_______.
Answer:
Cool
True Or False
Write ‘true’ or ‘false’ against the following statements:
1. Water is found in four states.
Answer:
False
2. About one-third of the earth is covered with water.
Answer:
False
3. Sea water is saline.
Answer:
True
4. Water vapour enters the air due to the process of evaporation.
Answer:
True
5. The circulation of water in the environment is known as water cycle.
Answer:
True
6. We should conserve water for future.
Answer:
True
7. Sunlight is essential to convert water into its vapour.
Answer:
False
8. The circulation of water between ocean and air is known as water cycle.
Answer:
False
9. Most of the rainfall occurs during the monsoon season.
Answer:
True
10. Water drops appear on the outer surface of a glass confining hot water.
Answer:
False
11. Water changes its state on heating or cooling.
Answer:
True
12. Water evaporates only in summer.
Answer:
False
13. Humans and animals release water vapour into the air by the phenomenon called transpiration.
Answer:
False
14. During summer, we prefer to wear cotton clothes to keep ourselves cool.
Answer:
True
15. Evaporation occurs on its own at all temperatures.
Answer:
True
16. We sweat a lot in hot and humid weather than in dry weather.
Answer:
True
17. The loss of water from plants as water vapour through the pores of their leaves is called transpiration.
Answer:
True
18. The process of transpiration puts a large amount of water vapour in the air.
Answer:
True
19. Condensation is the reverse of evaporation.
Answer:
True
20. The process of water vapour changing into water on cooling is evaportion.
Answer:
False
Match the Following
Match the items in Column A to those in Column B:
| Column A | Column B |
| i. Rainfall | (a) Handpump |
| ii. Water cycle | (b) Winter morning |
| iii. Groundwater | (c) Monsoon season |
| iv. Dew on leaves of grass | (d) Circulation of water |
Answer:
| Column A | Column B |
| i. Rainfall | (c) Monsoon season |
| ii. Water cycle | (d) Circulation of water |
| iii. Groundwater | (a) Handpump |
| iv. Dew on leaves of grass | (b) Winter morning |
Quiz Time
Question 1.
Why is water essential for life?
Answer:
All living things need water for proper working of their body. We use water for drinking, cooking, cleaning, washing, etc.
Question 2.
What is evaporation?
Answer:
Loss of water in the form of vapour into the atmosphere is called evaporation
Question 3.
What is condensation?
Answer:
The process of conversion of water vapour into liquid form of water is called condensation.
Question 4.
How is groundwater useful to us?
Answer:
Ground water is the water source for wells,hand pumps and tubewells from which we draw water
Question 5.
Out of evaporation and condensation, which process brings water back to the surface of earth?
Answer:
Condensation
Question 6
Why should we use water carefully?
Answer:
The amount of usable water on earth is limited so it needs to be used carefully
Question 7.
When we kept cold steel plate over a boiled hot milk, tiny droplets appeared on the inner side of plate, name the phenomenon.
Answer:
Condensation (Hot water vapour on touching cold plate gets condensed into small water droplets)
Question 8
If humidity is high, wet clothes get dried faster or slower?
Answer:
Slower
Question 9.
Which has highest spreading (or flowing) speed— Solid, Liquid or Gas?
Answer:
Gas
Question 10.
Which state of water has fixed volume?
Answer:
Ice (Solid)
Self—Assessment
Multiple Choice Questions (1 Mark each)
Question 1.
The process of conversion of water into vapours is called _____
(a) transpiration
(b) evaporation
(c) condensation
(d) all of these
Question 2.
In how many states of matter does water exist?
(a) One
(b) Two
(c) Three
(d) Four
Question 3.
Condensation is the process in which _____
(a) water converts into vapours
(b) water converts into ice
(c) vapours convert into water
(d) all of these
Question 4.
Assertion (A): More is the humidity, water evaporates faster.
Reason (R): Humidity is the amount of water in the air.
(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 R is false.
(d) A is false but R is true.
Question 5.
Match the items in Column A to those in Column B:
| Column A | Column B |
| (i) Rainfall | (a) Handpump |
| (ii) Water cycle | (b) Winter morning |
| (iii) Groundwater | (c) Monsoon season |
| (iv) Dew on leaves of grass | (d) Circulation of water |
(A) (i) – (b), (ii) – (a), (iii) – (d), (iv) – (c)
(B) (i) – (d), (ii) – (c), (iii) – (a), (iv) – (b)
(C) (i) – (c), (ii) – (d), (iii) – (a), (iv) – (b)
(D) (i) – (d), (ii)- (a), (iii) – (b), (iv) – (c)
Question 6.
Why are not we able to notice evaporation from a bucket full of water?
Question 7.
Define the term evaporation.
Question 8.
Give one example each of solid form of water and liquid form of water.
Question 9.
What is water cycle?
Question 10.
Name two sources of water.
Question 11.
How can we conserve water?
Question 12.
What are the sources of groundwater?
Question 13.
How is dew formed?
Question 14.
Write the difference between evaporation and condensation.
Question 15.
What is fog?
Question 16.
What is humidity? How does it affect the process of evaporation?
Question 17.
List down all the factors on which the evaporation depends. Describe briefly.
Question 18.
How can the states of water be interchanged? Explain with the help of flow-chart.
Question 19.
Why is the water cycle important?
Question 20.
Why is there a need to conserve water? Give two reasons.
Question 21.
Describe briefly the water cycle and define all the processes involved.
Question 22.
Explain the processes by which clouds are formed with the help of a diagram.
Question 23.
Define the term conservation of water? Give the suggestions for conserving water (any three).