• 108 is a free telephone number for emergency services in India.
• The 108 Emergency Response Service is a free emergency service providing integrated medical, police and fire emergency services.
• Hence 108 contact number is important at the time of disaster.
• So, the correct answer is '108'.

An anemometer is a type of weather instrument that measures wind speed. Some of these instruments measure both wind speed and wind direction. Anemometers are common at weather stations. A cup anemometer is a type of instrument that uses three or four hemispherical cups mounted on horizontal arms on a vertical rod.

• A natural disaster is a major adverse event resulting from natural processes of the Earth; examples are floods, hurricanes, drought, landslide tornadoes, volcanic eruptions, earthquakes, tsunamis, etc that causes great damage or loss of life.
• A car accident is not a natural disaster it is caused by human negligence and does not lead to great damage or loss of life. Hence car accident is not a natural disaster.
• Hence All of the following is associated with the natural disaster except car accident.
• So, the correct answer is 'Car accident'.

An exclusively man-made disaster is bomb explosion. Bomb is an explosive weapon that uses the exothermic reaction of explosive material or provide an extremely sudden and evident release of energy. This is invented by humans and any disaster caused by it is exclusively man-made. while fire, floods, and famine are not exclusively man-made disasters. Nature itself trigger or aids in these disasters. Therefore they are not exclusively man-made. 

• Earthquake is a sudden violent shaking of the ground, typically causing great destruction, as a result of movements within the earth's crust and the sudden release of energy in the Earth's lithosphere that creates seismic waves.
• Tectonic plates are pieces of Earth's crust. Together with upper mantle, it is called the lithosphere.
  
• Earthquakes are caused due to the shift of the tectonic plates present on the crust of the earth.
  
• So, the correct answer is 'The shift of the tectonic plates present on the earth crust'.

Reforestation is a process of replanting trees in an area, reforestation is an effective way of checking floods, planting trees can reduce the height of flood by 20%.

• Earthquake is a sudden violent shaking of the ground, typically causing great destruction, as a result of movements within the earth's crust and the sudden release of energy in the Earth's lithosphere that creates seismic waves.
• A seismograph, or seismometer, is an instrument used to detect and record earthquakes. Generally, it consists of a mass attached to a fixed base. During an earthquake, the base moves and the mass does not.
  
• Hence earthquakes recorded by a seismograph.
• So, the correct answer is 'By a seismograph'.

• A tsunami or tidal wave, also known as a seismic sea wave, is a series of waves in a water body caused by the displacement of a large volume of water, generally in an ocean or a large lake.
• A tsunami can be caused due to various reasons. Among them, the most destructive Tsunamis are caused by earthquakes 
  
• Hence a tsunami can be caused due to Underwater earthquake.
  
• So, the correct answer is 'Underwater earthquake'.

• A tsunami or tidal wave, also known as a seismic sea wave, is a series of waves in a water body caused by the displacement of a large volume of water, generally in an ocean or a large lake.
• Mangroves are forests of salt-tolerant trees and shrubs that grow in the shallow tidal waters of estuaries and coastal areas in tropical regions. Mangroves protect shorelines from damaging storm and hurricane winds and tsunami.
• A coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed of colonies of coral polyps held together by calcium carbonate. Coral reefs provide protection to our coasts from the tsunami, storms, and floods.
  
• Hence Coral Reefs and Mangroves can act as natural barriers to control Tsunami.
• So, the correct answer is 'Both A and B'.