Human influence on rainfall

Which statement best describes how rain is formed?

• moist air cools to form clouds then rain occurs

• moist air rises, cools, condensation occurs, clouds are formed.

• moist air rises, cools, condensation occurs, clouds are formed, then rain occurs

• moist air rises, cools, condensation occurs, then rain fall.

Which of the following human activities may not influence rainfall?

• factories

• deforestation

• cloud seeding

• the use of renewable energy

Which statement best defines cloud seeding?

• a deliberate attempt by man to modify type of rainfall

• an artificial method of inducing formation of clouds and rain by introducing a condensation nuclei in the atmosphere.

• an artificial method of making clouds and rain.

• an artificial method of inducing formation of clouds and rain by by using aeroplanes that has happened only in UAE.

How does cloud seeding influence rainfall?

• introduction of condensation nuclei increases condensation, clouds and rainfall amount

• it increases rain clouds and rainfall

• it leads to formation of convectional rainfall

• rainfall may happen more often after cloud seeding.

Cloud seeding successfully happens only with cumulus clouds. True or false?

• TRUE

• FALSE

Cloud seeding may increase precipitation by what percentage?

• 5-10%

• 10-20%

• 15-30%

• 5-20%

In which of the following countries has cloud seeding been a success?

• India

• China

• Thailand

• USA

• All of the above

One of the following is a reason why countries use cloud seeding:

• to increase regular water supply for desert areas

• to tackle drought in affected areas

• to stop climate change

• to modify the climate

For cloud seeding to be successful, the following is required:

• a large amount of condensation nuclei should be available in the atmosphere

• conditions for cloud formation should be present

• a cloudy weather is required.

• a hot dry climate is required.

Which of the statements below is true?

• cloud seeding in UAE takes place only in winter

• cloud seeding in UAE takes place only in summer

• cloud seeding is not limited by season but can take place any time of the year.

• cloud seeding is only possible in the months of December to March.