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Cyclonic winds - class-VIII

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________ was very severe Cyclonic Storm and the most intense tropical cyclone of the 2016 in North Indian Ocean.

  1. Hudhud

  2. Ockhi

  3. Vardah

  4. Nilofar


Correct Option: C

In the satellite based techniques, track and intensity of cyclones are forecast based on the _________ associated with cyclone.

  1. wind speed

  2. cloud pattern

  3. atmospheric pressure

  4. climate


Correct Option: B

The Cyclone name Vardah, was suggested by __________.

  1. India

  2. Pakistan

  3. Sri Lanka

  4. Saudi Arabia


Correct Option: B

Which of the following country does not decide the naming the cyclone in the Indian Ocean region?

  1. India

  2. Sri Lanka

  3. Thailand

  4. Japan


Correct Option: D

Hurricane is a tropical cyclone that occurs in the ___________.

  1. Atlantic Ocean

  2. North-eastern Pacific Ocean

  3. Indian Ocean

  4. Both A & B


Correct Option: D

 The term Vardah, refers to ________.

  1. white rose

  2. eye

  3. national bird of Pakistan

  4. red rose


Correct Option: D

In Indian Ocean region, naming the cyclone is decided by __________.

  1. India

  2. Sri Lanka

  3. Bangladesh

  4. All of these


Correct Option: D

What is a water spout?

  1. A rotating body of water formed by whirlwind

  2. Water transported through pipeline

  3. Water source from underground

  4. Water collected from rain


Correct Option: A
Explanation:

Water Spout is a phenomenon that results in the formation of vertical water funnel at sea. A rotating column of water and spray formed by a whirlwind occurring over the sea or other body of water.

The type of wave affecting Bay of Bengal is ____________.

  1. Hurricane

  2. Typhoon

  3. Cyclone

  4. Tornado


Correct Option: C
Explanation:

Since sea surface temperatures and humidity both directly correlate with chances of cyclone formation, the Bay of Bengal is a more likely target because it gets higher rainfall, and because the sluggish winds around it keep temperatures relatively high: about 28 degrees around the year. Warm air currents enhance this surface temperature and aid the formation of cyclones.

In addition, the Bay receives higher rainfall and constant inflow of freshwater from the Ganga and Brahmaputra rivers. This means that the Bay’s surface water keeps getting refreshed, making it impossible for the warm water to mix with the cooler water below, making it ideal for depression. 

Which one of the following regions receives winter rainfall caused by western disturbances?

  1. Punjab

  2. Tamil Nadu

  3. Kerala

  4. Karnataka Coast


Correct Option: A

Two important type of cyclonic activity is  _______.

  1. Cyclones

  2. Anticyclones

  3. Both a and b

  4. None of these


Correct Option: C
Explanation:

Cyclone and anticyclone are two important types of cyclonic activity. The atmospheric disturbance which involves a closed circulation about a low-pressure center, anticlockwise in the northern hemisphere and clockwise in the southern hemisphere, are called cyclones. On the other hand, anticyclone plays a much less important role in the weather-drama at the surface of the earth in comparison with the cyclone. It denotes on atmospheric system that is just opposite of the cyclonic system.

Cyclones rotates  ________ in Northern Hemisphere.

  1. anticlockwise

  2. clockwise

  3. Both a and b

  4. None of these


Correct Option: A
Explanation:

When the wind is spirally moving in towards a low-pressure center then it is called a cyclone. A cyclone has a low pressure at its center and high pressure on the surrounding sides. The wind movement is anti-clockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere.

Cyclones blow _______ in the southern hemisphere.

  1. Clockwise

  2. Anticlockwise

  3. Both a and b

  4. None of these


Correct Option: B
Explanation:

When the wind blows from the high-pressure center towards the low-pressure center this atmospheric disturbance is known as a cyclone. Cyclone blows anticlockwise in the southern hemisphere. It blows anticlockwise because of the Coriolis force produced by the rotation of the earth.

The eye or the center of a cyclone has a low _______.

  1. Atmospheric Pressure

  2. Temprature

  3. Both a and b

  4. Humidity


Correct Option: A
Explanation:

An area of closed, circular fluid motion rotating in the same direction as the Earth is known as a cyclone. It has a lower pressure inside and higher pressure outside. The center of the cyclone is known as the eye. It has a diameter of 20-50 km. It is the point about which the rest of the storm rotates. It has the lowest atmospheric pressure.

Cyclonic activity varies from place to place in its _____________.

  1. Frequency

  2. Direction

  3. Intensity

  4. All of these


Correct Option: D
Explanation:

When high speed wind blows from high pressure towards the low pressure centre is known as cyclone. Their frequency, direction and intensity varies from place to place. In terms of direction it blows clock wise in southern hemisphere and anti-cyclone wise in  northern hemisphere. The frequncy and intensity also varies with its location and depending on that cyclones are known in different names in different places.

The center or eye of the Anticyclone has  __________.

  1. High Pressure

  2. Low pressure

  3. Both a and b

  4. None of these


Correct Option: A
Explanation:

An anti-cyclone originates when a mass of air with high pressure is encircled by that with low pressure. When such condition occurred the relatively cool and dry wind from high pressure blows out to the surrounding low pressure.  While blows out, the wind turns round and round. In anti-cyclone  there exits high pressure at the center, it is called the center or eye of anti-cyclone.

The rotation of earth affects the direction of _________.

  1. Cyclone

  2. Anticyclone

  3. Both a and b

  4. None of these


Correct Option: C
Explanation:

In the absence of rotation, the wind tends to blow from areas of high pressure to areas of low pressure. The stronger the pressure differences between a high-pressure system and a low-pressure system, the stronger the wind. The coriolis force caused by Earth's rotation gives winds within high-pressure systems their clockwise circulation in the northern hemisphere as the wind moves outward and is deflected right from the center of high pressure and anticlockwise circulation in the southern hemisphere as the wind moves outward and is deflected left from the center of high pressure. Friction with land slows down the wind flowing out of high-pressure systems and causes wind to flow more outward from the center.

North-Western parts of India get winter rainfall mainly due to ______.

  1. North-West monsoon

  2. Western disturbances

  3. North-East monsoon

  4. Retreating monsoon


Correct Option: B
Explanation:

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.

Natural disasters like cyclone, hurricane, typhoon and tornadoes show some initial _____ and thus give time to _____.

  1. neglect, destructions

  2. symptoms, preparations

  3. disperse, weaken

  4. plan, destruction


Correct Option: B

The centre of cyclone is called the _________.

  1. Centre of the storm

  2. Eye of the storm

  3. Focus

  4. Radius


Correct Option: B
Explanation:

The eye is a region of mostly calm weather at the center of strong tropical cyclones. The eye of a storm is a roughly circular area, typically 30–65 km (20–40 miles) in diameter. It is surrounded by the eyewall, a ring of towering thunderstorms where the most severe weather occurs.

Cyclone is called _________ in American Continents.

  1. Hurricane

  2. Tornado

  3. Typhoon

  4. Thunderstorm


Correct Option: A

Which one among the following conditions is not required for emergence of tropical cyclone?

  1. Peninsular land mass

  2. Strong Coriolis forces

  3. Large and continuous supply of warm and moist air

  4. Absence of strong vertical wind wedge


Correct Option: A

Disaster management covers _________.

  1. Maintaining control over disasters

  2. Reducing the effects of disasters

  3. Briefing the top officials of government on the effects of disasters

  4. All of these


Correct Option: D
Explanation:
Disaster Management should aim to prevent emergencies from occurring, and failing that, should develop a good action plan to mitigate the results and effects of any emergencies. The development of emergency plans is a cyclical process, common to many risk management disciplines are set out below:

  1. Recognition or identification of risks
  2. Ranking or evaluation of risks
  3. Maintaining control over disasters
  4. Responding to significant risks
  5. Resourcing controls
  6. Reducing the effects of disasters
  7. Reaction planning
  8. Briefing the top officials of government on the effect of disasters
  9. Reviewing the Risk Management framework

The eye of a cyclone is ________.

  1. Cloudy and highly stormy

  2. Full of strong winds

  3. Calm and cloudless

  4. Site with high atmospheric pressure


Correct Option: C

Mitigation measure/s that can help in effective disaster management during cyclones include ______.

  1. Coastal Regulation Zone norms should be strictly enforced

  2. Telecom systems need to be robust

  3. Suitable guidelines should be framed by states for construction of hoardings

  4. All of these


Correct Option: D

What does the acronym ISDR stand for?

  1. International Strategy for Disaster Reduction

  2. International Significant Disaster Resources

  3. International Sustainable Development Report

  4. Intergovernmental Strategy for Developing Recreation


Correct Option: A
Explanation:

The International Strategy for Disaster Reduction (ISDR) is a global framework established within the United Nations for the promotion of action to reduce social vulnerability and risks of natural hazards and related technological and environmental disasters.

Its main purpose is to facilitate, in an inter-agency effort Governments and communities in disaster-prone areas in integrating the management of risk into their development policies, programs and projects. 

Cyclone in Japan and Philippines is called as _________.

  1. Hurricane

  2. Tornado

  3. Typhoon

  4. Thunderstorm


Correct Option: C
Explanation:

When a tropical cyclone forms in the western Pacific between 180 degrees and 100 degrees East longitude, it's called a typhoon. So, Japan, China, the Philippines, etc., get typhoons.

The instrument that measures the wind speed in a cyclone is ________.

  1. Anemometer

  2. Barometer

  3. Thermometer

  4. Ammeter


Correct Option: A
Explanation:

An anemometer is commonly used to measure wind speed. Wind speed, or wind flow velocity, is a fundamental atmospheric quantity. Wind speed is caused by air moving from high pressure to low pressure, usually due to changes in temperature. Wind speed is now commonly measured with an anemometer but can also be classified using the older Beaufort scale which is based on people's observation of specifically defined wind effects.

When was Nilofar cyclone observed in the Arabian Sea?

  1. October 2015

  2. October 2016

  3. October 2014

  4. October 2017


Correct Option: C

National institute of disaster management is in __________.

  1. Chennai

  2. Hyderabad

  3. New Delhi

  4. Bangalore


Correct Option: C
Explanation:

The National Institute of Disaster Management (NIDM) is a premier national organization working for human resource development at national and regional level in the area of disaster mitigation and management. The NIDM came into existence since October 16, 2003 by a Government of India order upgrading the National Centre for Disaster Management (NCDM), which was located at Indian Institute of Public Administration, New Delhi.

A violent tornado travels at a speed of about ________.

  1. 100 km/hr

  2. 200 km/hr

  3. 300 km/hr

  4. 400 km/hr


Correct Option: C
Explanation:

Tornado is a dark funnel shaped cloud that reaches from the sky to the ground. Most of the tornadoes are weak. A violent tornado can travel at speeds of about 300 km/h. Tornadoes may form within cyclones. In our country they are not very frequent. 

Which of the following is an early warning system for disaster management in the event of cyclone?

  1. Agromet advisory service

  2. Potential fishing zone advisory services

  3. Both A and B

  4. None of these


Correct Option: C

Tropical cyclones occur during the month of ________.

  1. November

  2. January

  3. December

  4. April


Correct Option: A

The tropical cyclones of the Bay of Bengal are usually called_________.

  1. Typhoons

  2. Hurricanes

  3. Depressions

  4. None of these


Correct Option: D

In which region belt of  'Doldrums' exists?

  1. Polar region

  2. Equatorial region

  3. Sub-Polar region

  4. Sub-Tropical region


Correct Option: B
Explanation:

Equatorial region
Doldrums, also called equatorial calms, equatorial regions of light ocean currents and winds within the intertropical convergence zone (ITCZ), a belt of converging winds and rising air encircling Earth near the Equator.

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