Examine hese two statements carefully and select the answers to these items using the code given below:

Statement I: Petroleum is a mixture of many different hydrocarbons of different densities.
Statement II: The grade of petroleum depends mainly on the relative proportion of the different hydrocarbons.

• Both the statements are individually true and Statement II is the correct explanation of Statement I.

• Both the statements are individually true but Statement II is not the correct explanation of Statement I.

• Statement I is true but Statement II is false.

• Statement I is false but Statement II is true.

Examine these two statements carefully and select the answers to these items using the code given below:

Statement I: There is high salinity in Red sea.

Statement II: Rate of evaporation is high in Red sea.

• Both the statements are individually true and Statement II is the correct explanation of Statement I.

• Both the statements are individually true but Statement II is not the correct explanation of Statement I.

• Statement I is true but Statement II is false.

• Statement I is false but Statement II is true.

Examine these two statements carefully and select the answers to these items using the code given below:

Statement I: Volcanic eruption is accompanied by earthquakes.
Statement II: Volcanoes erupt water vapours and dust particles in the atmosphere.

• Both the statements are individually true and Statement II is the correct explanation of Statement I.

• Both the statements are individually true but Statement II is not the correct explanation of Statement I.

• Statement I is true but Statement II is false

• Statement I is false but Statement II is true.

Examine these two statements carefully and select the answers to these items using the code given below:

Statement I: Plantation farming has mostly been practised in humid tropics.
Statement II: The soil of humid tropics is highly fertile.

• Both the statements are individually true and Statement II is the correct explanation of Statement I.

• Both the statements are individually true but Statement II is not the correct explanation of Statement I.

• Statement I is true but Statement II is false

• Statement I is false but Statement II is true.

Examine these two statements carefully and select the answers to these items using the code given below:

Statement I: India has wide variation, in population density.
Statement II: Factors like agricultural productivity and history of settlements have greatly influenced the population density pattern in India.

• Both the statements are individually true and Statement II is the correct explanation of Statement I.

• Both the statements are individually true but Statement II is not the correct explanation of Statement I.

• Statement I is true but Statement II is false

• Statement I is false but Statement II is true.

A container is first filled with water and then entire water is replaced by mercury. Mercury has a density of 13.6 x 10³ kg/m³ If X is the weight of the water and Y is the weight of the mercury, then

• X = Y

• X = 13.6 Y

• Y = 13.6 X

• None of the above

Density of water is

• maximum at 0°C

• minimum at 0°C

• maximum at 4°C

• minimum at -4°C

The phosphorus used in the manufacture of safety matches is

• Red phosphorus

• Black phosphorus

• White phosphorus

• Scarlet phosphorus

9.

Which one of the following is not a chemical change?

• Ripening of fruits

• Curdling of milk

• Freezing of water

• Digestion of food

One of the main causes of air pollution in cities is emissions from vehicles like cars and trucks. Cars emit various pollutants which are bad for human health when inhaled, like

1. Nitrogen oxides (NO_x)
2. Carbon monoxide (CO)
3. Carbon dioxide (CO₂)
4. Benzene

Which of the above pollutants are not tolerated by human beings even at very low levels?

• 1 and 4 only

• 1 and 2 only

• 1,2 and 3 only

• 1,2 and 3 only