Class-7 Our Environment – Air

Total numbers of question is 73.

 

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#1. Our earth is surrounded by a huge blanket of air called ____.

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#2. Atmosphere __

Select all that apply:

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Write the percentage of different constituents of air.

#3. Nitrogen ___ %

#4. Oxygen ____ %

#5. Carbon dioxide ___ %

#6. Argon ____ %

#7. All other gases ___ %

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#8. ____ is the most plentiful gas in the air.

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#9. _____ is called a greenhouse gas.

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#10. Without ____ gas the earth would have been too cold to live in.

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#11. ______ are the reason for global warming.

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Write the name of atmosphere layers starting from the earth’s surface.

#12. 1st layer ____

#13. 2nd layer ____

#14. 3rd layer ____

#15. 4th layer ____

#16. 5th layer ____

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Write the height of the atmosphere layers from earth surface.

#17. Troposphere ___ km

#18. Stratosphere ___ km

#19. Ionosphere between _____km.

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#20. Ionospheree is a part of ____ layer

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#21. The air we breathe and almost all the weather phenomena like rainfall, fog and hailstorm occur in _____ layer of the atmosphere .

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#22. ___ layer of atmosphere is most ideal for flying aeroplanes.

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#23. ____ gas protects us from the harmful effect of the sun rays.

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#24. ___ layer contains a ozone gas.

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#25. Meteorites burn up in _____ layer on entering from the space.

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#26. Radio waves transmitted from the earth are reflected back to the earth by ____ layer.

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#27. In ____ temperature rises very rapidly with increasing height.

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#28. _____ layer has very thin air. Light gases like helium and hydrogen float into the space from here.

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#29. Earth receives only ___ in 2,000,000,000 parts of the sun’s energy.

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#30. Weather condition of a place for a longer period of time represents the ____ of a place.

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#31. The degree of hotness and coldness of the air is known as _____.

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#32. ___ is the incoming solar energy intercepted by the earth.

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#33. The amount of insolation ___ from the equator towards the poles.

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#34. Temperature in cities is ___ than that of villages.

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#35. The Standard unit of measuring temperature is degree _____.

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#36. Water freezes at ____°C.

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#37. Water boils at ___ °C.

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#38. Is air present on the moon.

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#39. A wind is named after the direction ___ which it blows.

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#40. Pressure exerted by the weight of air on the earth’s surface is called ____.

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#41. The air pressure is highest at ____

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#42. Horizontally the distribution of air pressure is influenced by ___ of air at a given place.

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#43. In areas where temperature is high the air gets heated and rises. This creates a ___ area

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#44. ____ is associated with cloudy skies and wet weather.

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#45. ___ air pressure is associated with clear and sunny skies.

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#46. The air always moves from ___ areas.

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#47. The movement of air is called ____.

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Winds are divided into three types.

#48. The trade winds, westerlies and easterlies are the ____ winds

#49. ____ winds change their direction in different seasons.

#50. ____ winds blow only during a particular period of the day or year in a small area.

#51. ____ winds blow constantly throughout the year in a particular direction.

#52. Monsoons in India is an example ____ winds.

#53. Land and sea breeze is an example ____ winds.

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#54. Hot and dry local wind of northern planes of India is called __.

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#55. Moisture in the air at any time, is known as ___.

#56. When the air is full of water vapour we call it a ___ day

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#57. As the air gets warmer, its capacity to hold the water vapour ____.

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#58. On a humid day, clothes take ____ to dry.

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#59. Clouds are just masses of ___ droplets.

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#60. Jet planes flying in the sky leave a white trail behind them. We see trails of this due to _____

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#61. Precipitation that comes down to the earth in liquid form is called _____.

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#62. When these droplets of water become too heavy to float in air, then they come down as ___.

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Write the name of three types of rainfall

#63. 1st ___ rainfall

#64. 2nd ___ rainfall

#65. 3rd ___ rainfall

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#66. The most important layer of the atmosphere is ___

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#67. This layer is almost free from clouds and associated weather phenomenon ?

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#68. Permanent wind is ___

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