Question : The rapidly growing mass of phytoplankton covering the surface water of a lake or pond is known as:

Option 1: eutrophication

Option 2: water bloom

Option 3: water pollution

Option 4: water hyacinth

Question : Directions: Two statements are given, followed by two conclusions numbered I and II. Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follow(s) from the statements.
Statements:
Some rivers are oceans.
All oceans are beaches.
Conclusions:
I. Some rivers are beaches.
II. All oceans are rivers.

Option 1: Only conclusion II follows

Option 2: Both conclusions I and II follow

Option 3: Neither conclusion I nor II follows

Option 4: Only conclusion I follows

Question : What is a brine solution?

Option 1: Excess salt + water

Option 2: Silver

Option 3: Excess ethanol + water

Option 4: Excess starch + water

Question : In a mixture of 25 litres, the ratio of acid to water is 4 : 1. Another 3 litres of water is added. The ratio of acid to water in the new mixture is:

Option 1: 5 : 2

Option 2: 2 : 5

Option 3: 3 : 5

Option 4: 5 : 3

Question : Which of the following rivers is not a tributary of Ganga?

Option 1: Ghagra

Option 2: Bhima

Option 3: Ramganga

Option 4: Yamuna