Q 01/05

Flash floods have a gap between rainfall and flooding of fewer than how many hours?

A) Six

B) Twelve

C) Eighteen

D) Twenty-four

Answer · why

A) Six

Urban flooding, on paved ground that cannot absorb water, is often of this type.

Q 02/05

Which adjective describes flooding from rain pooling on saturated or frozen ground, not a river overflowing?

A) coastal

B) areal

C) tidal

D) muddy

Answer · why

B) areal

It happens in flat places like floodplains and endorheic basins where water arrives faster than it can soak in or run off.

Q 03/05

A '100-year flood' is one with what probability of occurring in any given year?

A) 2%

B) 5%

C) 1%

D) 10%

Answer · why

C) 1%

The name is misleading: many places can each have their own 100-year flood in the same year.

Q 04/05

Deliberate agricultural flooding is used to prepare fields for growing which semi-aquatic crop?

A) wheat

B) sugar cane

C) cotton

D) rice

Answer · why

D) rice

Paddy fields are flooded on purpose; land is also flooded intentionally for military or river-management reasons.

Q 05/05

Which of these is a waterborne disease whose spread increases after floods?

A) cholera

B) malaria

C) measles

D) tuberculosis

Answer · why

A) cholera

Hepatitis A and E and diarrhoeal diseases are others; malaria and dengue rise too, but via mosquitoes breeding in standing water.