Pressure belts and planetary winds - class-VII
Description: pressure belts and planetary winds | |
Number of Questions: 49 | |
Created by: Rani Rajan | |
Tags: social science atmosphere and climate insolation and atmospheric conditions weather and climate weather and climate india : climate, flora and fauna geography atmosphere pressure belts and winds air around us atmospheric pressure and winds winds |
Which of the following places is likely to get affected by a cyclone?
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Delhi
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Jaipur
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Amritsar
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Puri
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.
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Both 'A' and 'R' are true and 'R' is the correct explanation of 'A'.
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Both 'A' and 'R' are true and 'R' is not the correct explanation of 'A'.
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'A' is true but 'R'n is false.
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'A' is false but 'R' is true
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 ________.
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Wind
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Storm
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Cyclone
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Both A and C
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?
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Due to moderating effect of the seas
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Due to land mass
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Due to heat conditions
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Due to rotation of the earth
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 _______.
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Malabar coast
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Coromandel coast
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Konkan coast
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Saurashtra coast
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 ______________.
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Barometer
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Anemometer
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Thermometer
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Hygrometer
The instrument used for measuring air pressure is called __________________.
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Hydrometer
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Anemometer
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Barometer
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Thermometer
- 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?
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Both decrease with height
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Both remain constant
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Both increase with height
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The pressure decreases but the temperature increases with height
Equatorial low pressure belt exists between _________________.
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$10^0N-10^0S$
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$5^0N-5^0S$
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$15^0N-15^0S$
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$5^0N-15^0S$
'Horse Latitudes' is a geographical name of __________________.
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High pressure areas $30^{\circ}N$ and $30^{\circ}S$
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Areas which lie between $5^{\circ}N$ and $5^{\circ}S$ of equator
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Equatorial doldrums
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Polar regions
State whether these sentences are true or false
The two Temperate Zones maintain a moderate climate.
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True
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False
Earth rotates from ______________.
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East to west
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West to East
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North to South
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South to North
West to East,
The prevailing winds blowing from $30^\circ S$ and $30^\circ$ N towards the equator are termed as ______.
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Monsoon winds
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Antitrade winds
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Trade winds
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Polar winds
The wind flowing in the northern plains of India in summers is known as ________.
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kal baishaki
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trade winds
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loo
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western disturbance
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?
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10%
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15%
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20%
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14%
- 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 ________________.
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Konkan Coast
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Malabar Coast
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Coromandal Coast
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Gujarat Coast
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 _________ .
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doldrums
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ITCZ
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horse latitudes
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none of the above
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.
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True
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False
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.
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Octagon , 8
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Hexagon, 6
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Polygon, 2
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None of these
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?
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Flower
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Instrument to measure wind flow
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Instrument to measure wind speed and direction
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None of these
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 __________.
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Day, Year
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Day , Month
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Day , periods
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None of these
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 _______.
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Day of relax
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Day of calm
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Day of winter
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None of these
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.
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Vertical
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Horizontal
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Both a and b
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None of these
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 ___________.
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Air current
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Wind
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Tides
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Cyclone
- 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?
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Thunderstorm
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Hurricane
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Typhoon
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Tornado
- 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 _______.
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Trade winds
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Westerlies
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Local disturbances
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Retreating monsoons
Westerlies,
What is meant by planetary winds?
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Winds occurring on the planet throughout the year
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Winds occurring on the planet in seasons
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Winds occurring due to local variation in temperature and pressure
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These are the winds which blow extensively over continents and oceans
Planetary winds play a crucial role of transporting _____ across the world.
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Heat
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Moisture
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Both A & B
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None of these
Heat and Moisture,
Winds are classified into _____ types.
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Two
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Three
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Four
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Five
Winds are classified into three types:
Planetary winds are of three types including ______.
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Trade winds
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Westerlies
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Polar winds
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All of these
The local winds blow in the lower level of the _____.
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Stratosphere
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Mesosphere
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Thermosphere
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Troposphere
Troposphere,
What is the name of cold local winds that blow from the Alps?
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Chinook
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Loo
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Mistral
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Puna
Mistral
Loo is an example of _____.
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Hot and dry winds in Northern plains of India
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Cold local winds
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Trade winds
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None of these
- 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?
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Pampero
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Puna
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Chinook
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Loo
Which cold local wind blows in Pampas region of South America?
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Mistral
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Chinook
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Pampero
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Loo
The local winds blow due to local variation in the temperature and pressure and influence a _____.
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Large area
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Medium area
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Small area
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Very small area
Very small area,
The instrument used to measure wind direction is called _____________.
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anemometer
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wind vane
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thermometer
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hygrometer
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 _____________.
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anemometer
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hygrometer
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recorder
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weather cock
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?
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Knots
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Kilometers per hour
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Meters per second
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All of the above
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.
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Anemometer
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Wind vane
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Hygrometer
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Thermometer
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 _______.
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humidity
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pressure
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temperature
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altitude
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.
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True
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False
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 __________.
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1.20 Km per hour
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1.85 Km per hour
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12 Km per hour
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18 Km per hour
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?
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Direction and Pressure
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Pressure and Altitude
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Direction and Speed
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Pressure and Acceleration
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 __________.
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Direction from which the wind is blowing
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Opposite direction from which the wind is blowing
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Vertical direction from which the wind is blowing
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None of these
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 _________.
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Cardiograph
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Anemograph
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Algorithmic graph
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None of these
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 ________.
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Electrically operated dial
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Magnetically operated dial
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Mechanically operated dial
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None of these
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.
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2,4
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4, 2
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4, 4
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2,2
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.
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True
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False