Bhagwati International public School, Patan
Dr. Indu Dayal Meshri Primary English School
CLASS – 6 ANSWER KEY 2024-25
SUB: - SCIENCE CH- A JOURNEY THROUGH THE STATES OF WATER MAX.MARKS. -40
Q.1 ANSWER: -
1. (C) Melting 2. (A) Evaporation 3. (B) Three
4.(B) Water vapour from our mouth get condensed on the glass.
5. (D) Condensation
Q.2 ANSWER: -
1.Water cycle - Circulation of water
2. Mopped floor - Evaporation
3. Dew on leaves - Condensation
4. Rain fall - Precipitation
5. Earthen pot - Cooling effect
Q.3 ANSWER: - EVAPORATION
Melting
SOLID GAS
LIQUID
Freezing CONDENSATION
Q.4 ANSWER: -
1. The process of conversion of liquid into solid state is called freezing.
e.g. – Water freeze into ice, wax and coconut oil
2. Ocean water not suitable for the domestic use because it contains high level of salts which
makes it salty and corrosive. So, it cannot be used directly for drinking, washing or irrigation.
3. Water vapour (Steam) is a gaseous state of water. Which is formed by evaporation process.
WATER WATER VAPOUR
4.
PROPERTY SOLID LIQUID GAS
E.g. – ICE WATER VAPOUR
SHAPE Retain its shape Take shape of Take shape of
(fix shape) container (not fix) container
(not fix)
VOLUME Fixed fixed Not fixed
FLOW Does not flows flows
flow
5. Cooling effect: - Water seeps through the surface of earthen pot and evaporates, which
Imparts a cooling effect on the water.
E.g. – Sprinkling water during summers on the floor or roof.
6. AWG – (ATMOSPHERIC WATER GENERATOR): - These machines collect water from humid air to produce
drinkable water. This is done through the condensation of water vapour by cooling the air.
7. For the conservation of water there are some suggestion: -
1. Use required quantity of water without wasting it.
2. We should plant more and more trees because they are help in causing rainfall.
3.By collecting rainwater in tanks, ponds and by use of rain harvesting method.
Q.5 ANSWER
1. Evaporation-The process of conversion of water into water vapour is called evaporation.
Liquid state (Water) Gaseous state (vapour )
• Evaporation causes cooling because liquid molecules absorb heat from water or surrounding to be
converted into vapour.
• It is depended on temperature, surface area of water and humidity.
• E.g.- Evaporation of water takes place continuously from the oceans, rivers, lakes and seas.
• Drying of wet clothes, sweat on our body, Mopped floor, steam on hot pan.
• Seeping of water into the ground.
• Hand sanitiser disappears from our hand.
2.
EVAPORATION CONDENSATION
• The liquid changes • Gas changes into
into gas. liquid.
Water------------water vapour Water vapour---------Liquid
droplets
• Occurs at high • Occurs at low
temperature temperature.
• Evaporation at the • Condensation at the
low altitudes places high altitudes places
like sea. like mountains.
• e.g.- Boiling and • e.g.- Foggy windows
heating of water. and glasses in
winters.
• Hand sanitizer • Droplets on chilled
disappear from hands water glass.
etc.
3. Water splits on the floor disappears after some time because of the evaporation process.
The heat of the sun water is converts into vapour (gas). The Large surface area increase the rate of
evaporation. And after some time at the high temperature, it disappears
6.ANSWER: -
1. There are 3 process occurs in the formation of clouds formation: -
A. Evaporation
B. Condensation
C. Precipitation
Condensation plays a significant role in the process of bringing evaporated water back to the Earth's
surface.
* When air moves higher above the Earth's surface, it becomes cooler and cooler.
At certain heights, the air gets so cool that the water vapour in it turns into droplets which are generally formed
around dust particles.
* These small droplets float in the air and form clouds. Many droplets join together to form bigger drops of water.
Some drops get so heavy that they start falling. These falling water drops are Rain.
* The water from the ocean and the Earth's surface evaporates into the atmosphere as vapour and returns as rain,
hail or snow, ultimately flowing back to the oceans.
* This circulation of water between the earth surface and atmosphere is known as the water cycle.
