The major natural hazard that Bihar is particularly vulnerable to is:

Floods
Earthquakes
Droughts
Cyclones

The correct answer is: a) Floods.

Bihar is a state in eastern India. It is one of the poorest states in India, and is also one of the most disaster-prone states in the country. The major natural hazard that Bihar is particularly vulnerable to is floods.

Floods are caused by heavy rains, which can cause rivers to overflow their banks. This can lead to widespread damage to property and infrastructure, as well as loss of life. In recent years, Bihar has experienced several major floods, which have caused extensive damage and displacement.

The state government has taken some measures to mitigate the risk of floods, such as building embankments and drainage systems. However, more needs to be done to protect the people of Bihar from this devastating hazard.

Here is a brief explanation of each option:

  • Earthquakes: Bihar is located in a seismically active zone, and is therefore at risk of earthquakes. However, the state has not experienced a major earthquake in recent years.
  • Droughts: Bihar is also prone to droughts. The state receives an average of 1,000 mm of rainfall per year, but this can vary significantly from year to year. In some years, the state may receive as little as 500 mm of rainfall, which can lead to drought conditions.
  • Cyclones: Bihar is not directly affected by cyclones, which are tropical storms that form in the Bay of Bengal. However, the state can experience the effects of cyclones, such as heavy rains and strong winds.

I hope this information is helpful. Please let me know if you have any other questions.