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Atmospheric pressure and winds - class-XII

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Why don't the rivers falling into the Arabian Sea form deltas?

  1. The sea-coast is hard and rocky soil

  2. These rivers have a short swift course and flow down steep slopes

  3. They do not have enough of water

  4. None of these


Correct Option: B

The Indian scientist who led the international team of scientists on Inter-governmental Panel in Climatic Change was ___________.

  1. C.V.Raman

  2. U.R. Rao

  3. Madhavan Nair

  4. R.K. Pachauri


Correct Option: D

Western Ghats obstruct the south-west monsoon winds coming over from _________.

  1. Black Sea

  2. Red Sea

  3. South China Sea

  4. Arabian Sea


Correct Option: D
Explanation:

South-West monsoon has two branches, 1. Arabian sea branch, 2. Bay of Bengal branch. The moisture ladden winds of the SW monsoon follow the path of low pressure zone so as to reach ITCZ which is at ganga plains due to northward march of Sun over the tropic of cancer. While flowing towards ITCZ the Arabian Sea branch gets obstructed by the Western ghats, this gives heavy orographic rainfall on Western coast. On the other hand the bay of Bengal branch flows parallel to eastern ghats, so there is less precipitation.

Which of the following factors are climatic control factors?

  1. Latitude

  2. Altitude

  3. Distance from the sea

  4. All of these


Correct Option: D
Explanation:

All the above are the climate control factors.
The climate of any particular place is influenced by a host of interacting factors. These include latitude, elevation, nearby water, ocean currents, topography, vegetation, and prevailing winds. The global climate system and any changes that occur within it also influence local climate.

Continentality is a condition of __________.

  1. Cool weather

  2. Hot weather during summer and very cold weather during winter

  3. Moderate climate

  4. Extreme hot conditions


Correct Option: B
Explanation:

As the distance from the sea increases, people experience extreme weather conditions, i.e., very hot during summers and very cold during winters. This condition is known as Continentality.

Which of the following is the first sign of an approaching cyclone?

  1. Rains accompanied by lighting

  2. High temperature and humidity

  3. Cool breeze and rains

  4. Powerful waves


Correct Option: D
Explanation:

Cyclone is a natural calamity. It is a storm characterised by a low barometric centre and thunder storms, resulting in strong winds and eventually flooding rains. Even when the cyclone is very far, strong winds push water towards the shore causing huge water waves.

Which of the following places in India is most likely to experience cyclones ?

  1. Delhi

  2. Mumbai

  3. Puri

  4. Bhopal


Correct Option: C
Explanation:

Among the four places, Puri is the most likely to experience cyclones, it is due to its geographical location low pressure is easily created. Therefore high air pressure comes in great speed, it creates cyclones. Recently it witnessed cyclone Fanni.

Wind is the flow of gases on small scale.

  1. True

  2. False


Correct Option: B
Explanation:

The above statement is incorrect. Wind is the flow of gases on as large scale.

What does a braometer indicate?

  1. Changes in atmospheric (air) pressure.

  2. Changes in temperature

  3. The amount of rainfall

  4. The direction of the winds.


Correct Option: A

Winds are heavy at equator.

  1. True

  2. False


Correct Option: B
Explanation:

The above statement is incorrect. Winds are light at the equator because of the weak horizontal pressure gradients located there.

The interior layer of the earth which is subjected to great heat and pressure is known technically as the barysphere. Which part of the earth does it refer to ___________.

  1. Upper Mantle

  2. Asthenosphere

  3. Hydrosphere

  4. The Core


Correct Option: D

Wind consist of _____________.

  1. Bulk movement of dust

  2. Bulk movement of air

  3. Bulk movement of water

  4. None of these


Correct Option: B
Explanation:

The correct option is (B).Wind consist of bulk movement of air.

What do isobars indicate?

  1. The atmospheric pressure in a particular area.

  2. Rainfall in different places.

  3. Wind strengths in several areas.

  4. Places with the same temperature.


Correct Option: A

What are the Doldrums?

  1. The Trade Winds

  2. Areas of great humidity

  3. A low-pressure belt round the Equator where there are very light winds and calm seas.

  4. Areas where the seas are calm.


Correct Option: C

What does HYV stand for?

  1. High Yielding Varieties

  2. High Yolk Variety

  3. Health Young Variety

  4. None of them


Correct Option: A
Explanation:

 HYV programme refers to the use of High Yielding Variety (HYV) seeds for increasing agricultural output.


HYVs is a generic name for a group of genetical cultivars of crops such as rice, maize and wheat that have an increased growth rate, an increased percentage of a usable plant part or an increased resistance against crop diseases.

Hence, the correct option is $\text{A}$

In 1805, Admiral Francis Beaufort devised a guide to assess the speed and force of wind. It is called the ___________.

  1. Richter Scale

  2. Kelvin Scale

  3. Beaufort Wind Scale

  4. All of these


Correct Option: C
Explanation:

A numerical scale for relating wind speed and sea state, devised by the British Admiral Sir Francis Beaufort in 1805. Beaufort numbers (or forcesrange from force 0 (calm) to force 12 (hurricane). Sometimes (and originallycalled the Beaufort scale of wind forces.

How many points are there on the Beaufort scale for measuring wind force?

  1. 6

  2. 8

  3. 9

  4. 12


Correct Option: D
Explanation:

A numerical scale for relating wind speed and sea state, devised by the British Admiral Sir Francis Beaufort in 1805. Beaufort numbers (or forcesrange from force 0 (calm) to force 12 (hurricane). Sometimes (and originallycalled the Beaufort scale of wind forces.

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