9.Air water and weather
9 . Air water and weather
1. Multiple choice questions
1.A thick cloud of water drops formed above the land and water is called
Ans. Fog
2. Sea breeze blows during
Ans. Day
3.which of the following does not increase the evaporation process?
Ans. More humidity
4.which of the following is not correct?
Ans. Frost does not cause any damage to crops.
a. The conversion of water vapour into water is called condensation.
b. Droplets of water found on the ground on cold winter mornings are called Dew.
c. Water exists in nature as snow, liquid water and water vapour.
d. The level of underground water in an area is called water table.
3.write true and false .
a. When water vapour condenses on dust particles, rain is formed. (F)
b. Stationary air is called wind. (F)
c. Water exists in nature as snow and liquid water. (T)
d. Forest causes damage to crops. (T)
Statement 1 - Air is largely made up of hydrogen and oxygen.
Statement 2- Air occupies space but has no weight.
Ans. Statement 1 is true.
Q. 5 short answer type questions
Ans. When raindrops pass through very cold air in the atmosphere they freeze into balls of ice. This balls of ice fall to the ground as hail.
Ans. The level of underground water is called water table.
Ans. When the air gets heated by the sun it rises up because warm air is lighter than cold air the rising warm air causes the cool and heavier air to sink and take the place of the warmer and lighter air this cyclic movement of air causes winds to blow.
Ans. Weather is the condition of the atmosphere surrounding us at a particular time. It is considered in terms of temperature atmosphere pressure wind and moisture weather can be hot 🥵, cold 🥶 windy 🌬 dry or humid. Weather changes day today. It also changes during the year. It is hot in summer, wet during monsoons and very cold in winter.
Q. 6 Long answer type questions
Ans. Land heat up and cools down faster than water during the day, heat from the sun warmer the land and water since land gets heated faster than water, the air above the land is warmer than the air over the sea. The hot air being lighter, rises upwards and it's place is taken by the cool air above the sea, which rushes towards the land. Thus wind blows from the sea towards the land during the day. This is called sea breeze During the night the land cools down faster then the sea, mean while the air above the sea is still warm and the rises up, the cool air from the land when into lake the place of the air over the sea thus wind blows from the land towards t sea during the night is called land breeze.
Ans. Condensation is the process of change of water vapour into water by cooling. It plays a very important role in nature, dew frost, fog, rain, hail and snow are formed under different conditions due to condensation.
1. Dew- during very cold night, water vapour in air condenses and appears as droplets on the surface of ground grasses and plants, these droplets of water are called dew
2.frost- In extreme winter the earth become very cold the surface water or even dew surface into a tiny while this called frost.
3.fog- during cold condition when water vapour in air comes in contact cold water body or cold land condenses to form a thick cloud of water drops or fog in.
4.Rain- during hot days of summer water from lakes, rivers, sea etc. Evaporates and rises high in the sky on reaching a height the water vapour condenses and forms water droplets,. These droplets join together to form droplets. These droplets join together to form clouds. When these water droplets pass through cooler air, they become heaviet and fall to the earth as rain.
5.Hail- when raindrops pass through very cold air in the atmosphere, they freeze into balls of ice. This balls of ice fall to the ground as hail.
6. Snow- The water vapour freezes in air suddenly due to extreme cold and falls as tiny white flakes. These are called snow.
Ans. It is the sun that mainly controls the various change in weather by affecting temperature and state of water. The sun provide us with both heat and light. The heat of the sun warms the earth during the days are warm. After sunset ni heat cames. Therefore night are cool. The afternoon time is the hottest past of the day. This is because the sun is over heat at noon and the Sunday full straight on the earth. In the earth and slanting and therefore morning and evening are not very hot. The sun causes humidity rain and snow by changing the states of water.
Ans. Weather is the condition of the atmosphere with respect to temperative wind and moisture of a given place at any particular time. Temperature atmospheric pressure, wind and moisture are factors that affect weather. The weather is different at different places because the temperature and moisture very from place to place. The weather changes also depends on the angel at which sunlight falls at a place.
Ans. In extreme winter, the earth becomes very cold. The surface water or even dew freezes into tiny while crystals. This is called frost. It can be very damaging to crops.
Comments
Post a Comment