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Pressure belts and planetary winds - class-VII

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Which of the following places is likely to get affected by a cyclone?

  1. Delhi

  2. Jaipur

  3. Amritsar

  4. Puri


Correct Option: D
Explanation:

Cyclone usually occurred to the place which are near to the coastal region. Since, Puri is the place among all the option which is situated at coastal region.

Assertion (A) : Westerlies are stronger in the northen Hemisphere than in the southern Hemisphere
Reason (R) : The nothern Hemisphere has more land area than the southern Hemisphere.

  1. Both 'A' and 'R' are true and 'R' is the correct explanation of 'A'.

  2. Both 'A' and 'R' are true and 'R' is not the correct explanation of 'A'.

  3. 'A' is true but 'R'n is false.

  4. 'A' is false but 'R' is true


Correct Option: D
Explanation:

The westerlies are the prevailing winds in the middle latitudes between $35^{\circ}$ and $65^{\circ}$ latitude blowing from the west to east. The westerlies are strong especially in the southern hemisphere where there is less land in middle latitudes to cause flow pattern to amplify. The strongest westerly winds southern hemisphere is Roaring Forties which blows between $40^{\circ}$ and $50^{\circ}$ latitudes.

The horizontal movement of air is called ________.

  1. Wind

  2. Storm

  3. Cyclone

  4. Both A and C


Correct Option: A
Explanation:

Wind is defined as the perceptible natural movement of the air, especially in the form of a current of air blowing from a particular direction whereas breeze is the gentle wind.

Why do coastal areas experience less contrasts in temparature conditions?

  1. Due to moderating effect of the seas

  2. Due to land mass

  3. Due to heat conditions

  4. Due to rotation of the earth


Correct Option: A
Explanation:

Coastal areas experience less contrasts in temperature conditions due to moderating effect of the seas.  The large water bodies helps in moderating temperature. Water has a higher heat capacity than soil and rock, so the ocean takes much longer to heat and to cool than the land.

Tropical cyclones cause rains on the _______.

  1. Malabar coast

  2. Coromandel coast

  3. Konkan coast

  4. Saurashtra coast


Correct Option: B
Explanation:

Tropical cyclones causes rains on the Coromandel coast. Devastating cyclones originate in the Indian ocean especially in the Bay of  Bengal. The highest frequency of the cyclones is in the month of October and the first half of November. These cyclones are accompanied by strong winds, dense cloud, thundering and heavy rain. 

An instrument which measures the force and velocity of winds is called ______________.

  1. Barometer

  2. Anemometer

  3. Thermometer

  4. Hygrometer


Correct Option: D

The instrument used for measuring air pressure is called __________________.

  1. Hydrometer

  2. Anemometer

  3. Barometer

  4. Thermometer


Correct Option: C
Explanation:
  • The barometer is used for measuring atmospheric pressure, hence option C is correct.
  • Thermometer, is used to measure the temperature of human body.
  • Anemometer is used to measure wind speed and direction.
  • A hydrometer is used to measure the relative density of liquids.

How do the pressure and temperature vary with height?

  1. Both decrease with height

  2. Both remain constant

  3. Both increase with height

  4. The pressure decreases but the temperature increases with height


Correct Option: A

Equatorial low pressure belt exists between _________________.

  1. $10^0N-10^0S$

  2. $5^0N-5^0S$

  3. $15^0N-15^0S$

  4. $5^0N-15^0S$


Correct Option: B
Explanation:
$5^0 N - 5^0 S$
This low pressure belt is also called as doldrums, because it is a zone of total calm without any breeze. 
Subtropical High Pressure Belts. At about 30°North and South of Equator lies the area where the ascending equatorial air currents descend.

'Horse Latitudes' is a geographical name of __________________.

  1. High pressure areas $30^{\circ}N$ and $30^{\circ}S$

  2. Areas which lie between $5^{\circ}N$ and $5^{\circ}S$ of equator

  3. Equatorial doldrums

  4. Polar regions


Correct Option: A

State whether these sentences are true or false
The two Temperate Zones maintain a moderate climate.

  1. True

  2. False


Correct Option: A
Explanation:
True.
In geography, temperate latitudes of the Earth lie between the subtropics and the polar circles. Temperate means moderate. Unlike in the tropics, temperatures can change greatly here, between summer and winter. So, most places with a temperate climate have four seasons: summer, autumn, winter and spring.

Earth rotates from ______________.

  1. East to west

  2. West to East

  3. North to South

  4. South to North


Correct Option: B
Explanation:

West to East,

Earth's rotation is the rotation of Planet Earth around its own axis. Earth rotates eastward, in prograde motion. As viewed from the north pole star Polaris, Earth turns counterclockwise.
Because Earth rotates on its axis from west to east, the Moon and the Sun (and all other celestial objects) appear to move from east to west across the sky. Viewed from above, however, the Moon orbits Earth in the same direction as our planet rotates.

The prevailing winds blowing from $30^\circ S$ and $30^\circ$ N towards the equator are termed as ______.

  1. Monsoon winds

  2. Antitrade winds

  3. Trade winds

  4. Polar winds


Correct Option: C

The wind flowing in the northern plains of India in summers is known as ________.

  1. kal baishaki

  2. trade winds

  3. loo

  4. western disturbance


Correct Option: C
Explanation:

Loo is the hot wind blowing during the hot westher season. It is strong and dusty wind. It blows during day time over northern and northwestern india. 

What is the percentage of wind eroded area in India?

  1. 10%

  2. 15%

  3. 20%

  4. 14%


Correct Option: A
Explanation:
  • Among the two main agents of erosion in India, wind erosion contributes to erosion in close to 10% area in India. Approximately 90% area is eroded by water.
  • Hence option A is correct.

In India, which coast receives rainfall from North East monsoon ________________.

  1. Konkan Coast

  2. Malabar Coast

  3. Coromandal Coast

  4. Gujarat Coast


Correct Option: C
Explanation:

Coromandal coast receives winter rainfall because of the retreating monsoon and the North-east Monsoon winds which pass over the Bay of Bengal. There they get moisture and when they reach the Tamil Nadu coasts they cause rainfall there. During the winter season, the northeast trade winds prevail over the country.

The subtropical high pressure belt is often called _________ .

  1. doldrums

  2. ITCZ

  3. horse latitudes

  4. none of the above


Correct Option: C
Explanation:

The subtropical high pressure belt is often called horse latitude. It is situated around $30^o$ Northern and Southern hemisphere.

The monsoon winds are known as the seasonal winds.

  1. True

  2. False


Correct Option: A
Explanation:

The monsoon is a seasonal modification of the general planetary wind system. Monsoon winds are most powerful India and China. During summer, the interior of Asia become hot and low pressure develops there. On the other hand, the water surface of Indian ocean remains cooler and the pressure gradient is towards the heated interior. So monsoon wind blows from water to land, it is moist and brings lots of rain. In winter the water is warmer than the land surface. As a result, the wind blows from the interior towards the ocean so it is cold and dry. 

Wind rose consists of ______ made up of _________ compass points.

  1. Octagon , 8

  2. Hexagon, 6

  3. Polygon, 2

  4. None of these


Correct Option: A
Explanation:

Wind rose is a tool which gives us the idea of how typically the speed and direction of the wind are distributed at a particular location. It consist of 8 compass points. 

What is Wind Rose?

  1. Flower

  2. Instrument to measure wind flow

  3. Instrument to measure wind speed and direction

  4. None of these


Correct Option: C
Explanation:

Wind Rose is the instrument to measure wind speed and direction of the wind. They help to identify the direction and frequency of wind in a particular place. One of the important use of Wind Rose in the construction of airport runways, so that the airplane can take the best takeoff and landing point towards and away from the wind.

Periodic wind blow during particular time of the _______ or __________.

  1. Day, Year

  2. Day , Month

  3. Day , periods

  4. None of these


Correct Option: A
Explanation:

The winds which change their direction periodically with the change in season are known as periodic winds. They blow at regular intervals. They blow during particular time of the day or year. Localized differences in pressure and temperature are the main cause of periodic winds. For example, land and sea breezes and the seasonal wands.

Days without any wind are recorded as _______.

  1. Day of relax

  2. Day of calm

  3. Day of winter

  4. None of these


Correct Option: B
Explanation:

A wind rose diagram summarizes information about wind at a particular location over a specific period of time. It gives the percentage of time for which the wind blows from each direction, the strengths of these winds and the percentage of time calm air or light winds are observed. 

Wind is  ________ movement of air.

  1. Vertical

  2. Horizontal

  3. Both a and b

  4. None of these


Correct Option: B
Explanation:

Wind is the horizontal movement of the air. The differences in air pressure within our atmosphere causes the wind. Under high pressure, air moves towards area of low pressure. The greater the difference in pressure, the faster the air flows. Wind is described with direction and speed. The direction from which the wind is blowing describes the direction of wind.

The horizontal movement of the air is called ___________.

  1. Air current

  2. Wind

  3. Tides

  4. Cyclone


Correct Option: B
Explanation:
  • The horizontal movement of air is called wind, hence option B is correct.
  • Air current involves both horizontal and vertical movement of air thus incorrect.
  • Cyclone is a circular movement of air.
  • Tides are the rise and fall of the sea level due to gravitational pull of moon and sun.

In which of the following the wind velocity is the highest?

  1. Thunderstorm

  2. Hurricane

  3. Typhoon

  4. Tornado


Correct Option: D
Explanation:
  • Among the given options tornado has the highest wind velocity and the thunderstorm has the lowest wind velocity
  • Hence tornado is the right answer.

The moist air cause winter rains in the north-western region of India are part of _______.

  1. Trade winds

  2. Westerlies

  3. Local disturbances

  4. Retreating monsoons


Correct Option: B
Explanation:

Westerlies,

Western disturbances, specifically the ones in winter, bring moderate to heavy rain in low-lying areas and heavy snow to mountainous areas of the Indian Subcontinent. They are the cause of most winter and pre-monsoon season rainfall across northwest India.

What is meant by planetary winds?

  1. Winds occurring on the planet throughout the year

  2. Winds occurring on the planet in seasons

  3. Winds occurring due to local variation in temperature and pressure

  4. These are the winds which blow extensively over continents and oceans

Correct Option: D
Explanation:

These are the winds that blow extensively over continents and oceans.

Planetary Wind - Any wind system of the earth's atmosphere which owes its existence and direction to solar radiation and to the rotation of the earth.

Planetary winds play a crucial role of transporting _____ across the world.

  1. Heat

  2. Moisture

  3. Both A & B

  4. None of these


Correct Option: C
Explanation:

Heat and Moisture,


The winds blow through­out the year from one latitude to another in response to latitudinal differences in air pressure. They involve large areas of the globe.

Winds are classified into _____ types.

  1. Two

  2. Three

  3. Four

  4. Five


Correct Option: B
Explanation:

Winds are classified into three types:

(i) Planetary winds: The winds that blow from high-pressure belts to low-pressure belts are planetary winds. There are two type of planetary wind the trade wind and the westerly winds.
(ii) Periodic Winds: Sometimes winds changes their direction with the change of season or time. Such type of wind is called periodic wind. Monsoon, Land and sea breezes etc are the periodic winds.
(iii) Local Winds: There are some winds which affect small areas and restricted to the lower level of the troposphere. These winds are developed mainly as a result of the local difference in temperature and pressure. Foehn, Chinook, Samun etc are some famous local winds.

Planetary winds are of three types including ______.

  1. Trade winds

  2. Westerlies

  3. Polar winds

  4. All of these


Correct Option: D
Explanation:
1. Planetary Winds:
The winds blowing through­out the year from one latitude to another in response to latitudinal differences in air pressure are called “planetary or prevailing winds”. They involve large areas of the globe.

2. Trade Winds:
These are extremely steady winds blowing from subtropical high-pressure areas (30°N and S) towards the equatorial low-pressure belt. These winds should have blown from the north to south in Northern Hemisphere and south to north in Southern Hemisphere, but, they get deflected to the right in Northern Hemisphere and to the left in Southern Hemisphere due to Coriolis effect and Ferrel’s law. Thus, they blow as northeastern trades in Northern Hemisphere and southeastern trades in Southern Hemisphere.

They are also known as tropical easterlies, and they blow steadily in the same direction. They are noted for consistency in both force and direction.

3. The Westerlies:
These winds blow from subtropical high-pressure belts towards sub-polar low-pressure belts. The westerlies of Southern Hemi­sphere are stronger and constant in direction than Northern Hemisphere. These winds develop be­tween 40° and 65°S latitudes and these latitudes are known as Roaring Forties, Furious Fifties, and Shriek­ing Sixties.


Periodic Winds:
Periodic winds change their direction periodically with the change in season, e.g., Monsoons, Land and Sea Breezes, Mountain and Valley Breezes.

a. Monsoon Winds:

These winds are seasonal winds and refer to wind systems that have a pronounced, seasonal reversal of direction. According to ‘Flohn’, monsoon is a seasonal modification of general Planetary Wind System.

The local winds blow in the lower level of the _____.

  1. Stratosphere

  2. Mesosphere

  3. Thermosphere

  4. Troposphere


Correct Option: D
Explanation:

Troposphere,

Local winds occur on a small spatial scale, their horizontal dimensions typically several tens to a few hundreds of kilometres. They also tend to be short-lived lasting typically several hours to a day. There are many such winds around the world, some of them are cold, some warm, some wet, some dry. There are many hazards associated with the winds.

The main types of local winds are:
Sea breezes and land breezes, Anabatic and katabatic winds, and Foehn winds.

What is the name of cold local winds that blow from the Alps?

  1. Chinook

  2. Loo

  3. Mistral

  4. Puna


Correct Option: C
Explanation:

Mistral

The mistral is a strong, cold, northwesterly wind that blows from southern France into the Gulf of Lion in the northern Mediterranean. It produces sustained winds often exceeding 66 km/h (41 mph), sometimes reaching 185 km/h (115 mph). It is most common in the winter and spring, and strongest in the transition between the two seasons. Periods of the wind exceeding 30 km/h (19 mph) for more than sixty-five hours have been reported.

Loo is an example of _____.

  1. Hot and dry winds in Northern plains of India

  2. Cold local winds

  3. Trade winds

  4. None of these


Correct Option: A
Explanation:
  • The Loo is a strong, hot and dry summer wind that blows over the western Indo-Gangetic Plain region of North India and Pakistan.
  • It is especially strong in the months of May and June.
  • This creates a vast low pressure area over North Indian plains during afternoon.

Which among the following is a cold local wind in the Andes region?

  1. Pampero

  2. Puna

  3. Chinook

  4. Loo


Correct Option: A
Explanation:

Pampero 
The pampero is a burst of cold polar air from the west, southwest or south on the pampas in the south of Brazil, Argentina, Uruguay, Paraguay, and Bolivia. This wind (often violently) picks up during the passage of a cold front of an active low passing by. It takes the form of a squall line and there is a marked drop in temperature after its passing. The Pampero is most common in winter in the southern hemisphere (principally between May and August). During the summers in the region around Buenos Aires, the pampero storms are a welcome feature marking the end of long periods of high humidity and extreme heat.

Which cold local wind blows in Pampas region of South America?

  1. Mistral

  2. Chinook

  3. Pampero

  4. Loo


Correct Option: C
Explanation:
Pampero
The name given to severe line squalls in Argentina and Uruguay, particularly in the Rio de la Plata area. They are associated with marked cold fronts and are usually accompanied by rain, thunder, and lightning, a sharp drop in temperature and a sudden change of wind direction from northerly or northwesterly to southerly or south-westerly. They are most likely to occur during the period of June to September.

The local winds blow due to local variation in the temperature and pressure and influence a _____.

  1. Large area

  2. Medium area

  3. Small area

  4. Very small area


Correct Option: D
Explanation:

Very small area,

The local winds moderates the climate of nearby areas with sudden increase or decrease in the temperature and humidity. In valleys of the mountains, two kinds of winds are particularly active - anabatic winds and katabatic winds.  These winds are result of differential heating of the land and the sea.

The instrument used to measure wind direction is called _____________.

  1. anemometer

  2. wind vane

  3. thermometer

  4. hygrometer


Correct Option: B
Explanation:

The instrument which used to measure wind direction is called wind vane. It is generally located at the highest point of a building. This is pointed at the direction in which the wind is blowing. Wind vane is used to predict the weather of a particular place, as the direction of wind plays important role in determining weather of a place.

Wind vane is also known as _____________.

  1. anemometer

  2. hygrometer

  3. recorder

  4. weather cock


Correct Option: D
Explanation:

A wind vane is an instrument that shows the direction of the wind. It is generally located at the highest point of a building. It is also known as a weather clock, as it is used to predict the weather of a particular place. The direction in which the wind is blowing plays a significant role in predicting the weather of that particular place.

Which of the following are ways to express wind speed?

  1. Knots

  2. Kilometers per hour

  3. Meters per second

  4. All of the above


Correct Option: D
Explanation:

The knot is a unit of speed equal to one nautical mile per hour, exactly 1.8 km/h (approximately 1.15 mph)

Name the instrument used to measure the speed of wind.

  1. Anemometer

  2. Wind vane

  3. Hygrometer

  4. Thermometer


Correct Option: A
Explanation:

The term anemometer is derived from a Greek word 'anemos' which means wind. Anemometer is used to measure the speed of the wind. This instrument is used in all weather station. Tha standard height of the anemometer is 10meter in rural areas.

Wind forms as a result of difference in _______.

  1. humidity

  2. pressure

  3. temperature

  4. altitude


Correct Option: B
Explanation:

Wind is been defined as air in horizontal motion caused by difference in pressure. There are two type of movement in the atmosphere : horizontal movement and vertical movement. Vertically moving air columns are known as currents. Winds are the means by which uneven distribution of pressure over the globe is balanced out .

Wind vane has a freely rotating arm which moves with the wind.

  1. True

  2. False


Correct Option: A
Explanation:

Wind is always named by the direction from which they blow. Wind van is the most common type of instrument used to determine wind direction. So to measure wind direction wind van has a freely rotating arm which moves with the wind.

The speed of the wind is expressed in knots- one knot is equal to __________.

  1. 1.20 Km per hour

  2. 1.85 Km per hour

  3. 12 Km per hour

  4. 18 Km per hour


Correct Option: B
Explanation:

A knot is a unit of speed. It is abbreviated k tot kn. It is used around the world in meteorology and used for maritime and aviation purposes. One knot is the same as one nautical mile per hour. Therefore, one knot is equal to 1.1508 statute miles per hour (1.1508 mph or 1.852 kilometres per hour).

What are two basic wind measurements?

  1. Direction and Pressure

  2. Pressure and Altitude

  3. Direction and Speed

  4. Pressure and Acceleration


Correct Option: C
Explanation:

Direction and speed are the two basic wind measurements. Wind is always named by the direction from which it flows. The direction from which a wind blows is called windward side and towards which it blows is called Leeward did. The wind vane is the most common instrument to measure wind direction. The speed or flow velocity is an important atmospheric criterion. Wind generally blows high pressure towards the low-pressure areas due to temperature change. Anemometer is commonly used to measure wind speed.

The arrow of wind vane points to the __________.

  1. Direction from which the wind is blowing

  2. Opposite direction from which the wind is blowing

  3. Vertical direction from which the wind is blowing

  4. None of these


Correct Option: A
Explanation:

Wind are always named by the direction from which they blow. For example, a west wind blows from the West to East; a south wind blows from the south towards the north. The wind vane is the most common type instrument used to determine wind direction so it's arrow is always in the direction from which wind is blowing.

A self recording anemometer is known as _________.

  1. Cardiograph

  2. Anemograph

  3. Algorithmic graph

  4. None of these


Correct Option: B
Explanation:

A self-recording anemometer (Anemograph) giving a continuous trace of the direction and velocity of the surface wind. In the Dines tube anemograph, the wind pressure acts upon the opening of a tube arranged as a vane to face in the direction of the wind. Pressure is transmitted through the tube to a float carrying a pen, the height of which indicates the wind velocity.

In an Anemometer, when the cups rotate due to wind, their speed is recorded in a/an ________.

  1. Electrically operated dial

  2. Magnetically operated dial

  3. Mechanically operated dial

  4. None of these


Correct Option: A
Explanation:

The speed of wind can be measured using a tool called an anemometer. An anemometer looks like a weather vane, but instead of measuring which direction the wind is blowing with pointers, it has four cups so that it can more accurately measure wind speed. When wind pushes into the cups, they rotate the axis.

Anemometer consists of ____ cups attached to _____horizontal spokes that are mounted on a high vertical spindle.

  1. 2,4

  2. 4, 2

  3. 4, 4

  4. 2,2


Correct Option: C
Explanation:

Anemometer consists of four cups attached to four horizontal spokes that are mounted on a high vertical spindle. An anemometer is a device used for measuring wind speed and direction. It is also a common weather station instrument.

State whether these sentences are true (T) or false (F).
Air moves from low pressure to high pressure.

  1. True

  2. False


Correct Option: B
Explanation:

False,
When warm air rises, cooler air will often move in to replace it, so wind often moves from areas where it's colder to areas where it's warmer. So in the northern hemisphere, winds blow clockwise around an area of high pressure and counter-clockwise around low pressure.

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