Question : The surface tension of water on adding detergent to it:

Option 1: increases

Option 2: decreases

Option 3: no change

Option 4: becomes zero

Question : The five key indicators of global climate change of our planet are:

Option 1: Antarctic Sea ice, Oxygen, Rainfall, Drought, and sea level

Option 2: Sea - level, Rising temperature, Rainfall, Nitrogen, and Arctic sea ice

Option 3: Arctic sea ice, Carbon dioxide, Global temperature, Sea level, and Land ice

Option 4: None of these

Question : If water is frozen to become ice, its volume is increased by 10%, then if the ice is melted to water again, its volume will be decreased by:

Option 1: $9$%

Option 2: $9\frac{1}{11}$%

Option 3: $8$%

Option 4: $9\frac{1}{2}$%

Question : At a certain annual rate (rounded off to the nearest integer) of simple interest, a sum of money becomes nine times its original value in 21 years. By how much does the rate of interest change if the same sum of money has to become 12 times its original value in 25 years?

Option 1: Decreases by 6%

Option 2: Increases by 6%

Option 3: Increases by 8%

Option 4: Decreases by 8%

Question : Dry ice is the solid form of:

Option 1: Air

Option 2: Carbon Dioxide

Option 3: Nitrogen

Option 4: Water