CBSE Class 7 Science Winds, Storms and Cyclones Worksheet with Solution by Expert Science Mam. Students of 7th Grade can solve this worksheet for extra preparation before exam. Private Teacher or Guardians of the Students can copy all the questions of this chapter and will match after solve their students.
Winds, Storms and Cyclones Class 7 Worksheet
Worksheet for Chapter No.8): – Winds, Storms and Cyclones
The following questions are important for your exams for 1 mark 2 mark or 5 marks. First solve the questions on your own and then saw the solution for understanding it better.
Practice worksheet for class 7
Section A
Q .1.) What are the cyclones?
→ A cyclone is a weather condition consisting of a system of high speed winds revolving around the central area of very low pressure. It is a violent storm with a wind speed of 150 to 250 km/hour .
Q.2.) What are the storms?
→ When the wind blows at a low speed in a gentle manner called as breeze. Storm is a flow of wind violently at high speed. A storm is a low pressure system.
Q.3.) Define wind?
→ The moving air in a particular direction is called as wind.
Q.4) How air exerts pressure explain it with suitable example?
→ The air around us exerts pressure.
E.g. – a tin can filled with water heated over a flame, as soon as the water comes to a boil, the lid is put and it is kept under running cold water , we find that shape of the can get distorted.
Q.5.) What is the movement of air ?
→ Air moves from a region of high pressure to a region of low pressure.
Q.6.) How the heating of land and water affects wind current ?
→ Land gains and loses heat much faster than water. During summer winds moves from cooler seas towards the land which is hotter. These wind scary moisture and can cause monsoons. During winter this direction of wind flow is reversed and it moves from land towards the oceans.
Q.7.) Explain the relationship between flow of wind and the rain?
→ Rains are caused when winds from the ocean and seas flow towards land carrying moisture. The moisture in the clouds gets saturated after a point and the pour down as showers which are monsoon.
Q.8.) What are the thunderstorms?
→ Thunderstorms develop in areas that are very hot and humid like India. The high temperature creates strong upward currents that carry water vapor to high altitudes where they condense and fall down again. Due to such drastic pressure variations, they are accompanied by lightning and strong winds.
Q.9.) How thunderstorm converted to cyclone?
→ 1.) During a thunder storm, water releases heat when it changes from vapor to rain in the atmosphere. This warms the air around and create a drop in pressure.
2.) This causes air to rush in towards the center of the storm. The cycle causes low pressure system followed by strong high-speed winds that swirl around it.
Q.10.) What is the center of cyclone?
→ Cyclone is a large mass of air that rotates violently about 1015 km high in the air. The center of cyclone is a calm area called as the eye of the storm.
Q.11.) Explain the structure of a cyclone?
→ 1.) The center of a cyclone is a calm area called as eye of the storm.
2.) It has a diameter of about 10-30 kilometer
3.) Around the eye is a reason of clouds of about 150 km. This also has winds with speeds of up to 150 to 250 km per hour.
4.) The speed of the wind gradually decreases as it moves away from the eye.
Q.12.) What is tornado ?
→ 1.) A tornado occurs within a cyclone. It is in shape of rotating funnel that sucks in debris, dust and everything at the bottom and throws them out at the top.
2.) It has diameter from meter to a kilometer with speeds of up to 300 km/HR.
Q.13.) What is Coriolis effect ?
→ The force due to Earth rotation that tries to deflect winds towards left or right is known as Coriolis effect.
Q.14.) Write the names of different types of storms?
→ 1.) Snow storms
2.) Thunder storms
3.) Hurricanes
4.) Tornadoes
5.) Tropical storm
6.) Lightning
Q.15.) What are the effects of cyclone?
→ The effects of tropical cyclones include heavy rain, strong winds, larger storm, surges near landforms and tornadoes.
Q.16.) What causes the movement of air?
→ 1.) Moment of Air on earth determines the weather and the climate of all regions.
2.) The sun’s radiation hits of the land ,sea and air.
3.) The land and water bodies also it up the air, making it less dense.
4.) Hot Haier increases and create low pressure over that area and cold air sinks and creates origin of high pressure.
5.) Air like all fluids like to maintain equal pressure. Cold air from high pressure areas flows into origin of low pressure.
Q.17.) What are the causes of thunderstorms?
→ 1.) Air carrying water droplets are lifted vertically into the atmosphere due to unequal warming of the surface of the earth.
2.) Result the air condenses and heat is released with the expansion resulting from a decrease in pressure with increase in height.
3.) These condense droplets freeze and fall back to the ground along with the hail and lightning.
Q.18.) What are the regions affected by tropical cyclones and hurricane?
→ Regions affected by tropical cyclones:- reasons most affected by the tropical cyclones are India, Northwest Australia, Bangladesh, the Indian Ocean Islands such as Mauritius and Madagascar.
Reasons affected by hurricane:- the Caribbean Sea region is most affected by hurricane.
Q.19.) Which safety measures should we follow if a storm is followed by lightning?
→ 1.) Do not lie on the ground.
2.) Do not try taking cover under an umbrella.
3.) Avoid sitting near metal shades or open garage.
4.) A car or a bus is a safe place to take cover.
5.) If in water, rush out and go inside a building.
Q.20.) What are the safety measures from tornadoes?
→ 1.) Cyclone forecast and warning system.
2.) Rapid warning systems to government and fishermen and people in Prone zone.
3.) Construction of cyclone Shelters and rapid evacuation schemes.
4.) Avoid fallen powerlines.
5.) Corporation with others and rescue teams.