11.

Which of the following is a pair of exhaustible natural resources?

• Coal and soil

• Petroleum and water

• Minerals and wildlife

• Natural gas and Sun-light

The reason of sea breeze is

• During the day, the land gets heated faster than the seawater

• During the day, the seawater gets heated faster than the land

• At night, the land cools down more slowly than the seawater

• At night, the seawater cools down more slowly than the land

In which of the following units is the calorific value of fuels generally expressed?

• Calories per gram

• Kilocalories per kilogram

• Joules

• Kilojoules per kilogram

Which of the following commonly used fuels has maximum calorific value?

• Compressed Natural Gas (CNG)

• Diesel

• Liquefied Petroleum Gas (LPG)

• Petrol

Air is a mixture of many gases. The percentage by volume, of the gases other than nitrogen and oxygen, i.e., CO₂ methane, argon, ozone and water vapour combined together is about

• 0.1%

• 1%

• 21%

• 78%

In the food chain herbivores are

• primary producers

• primary consumers

• secondary consumers

• decomposers

Identify the correct statement(s).

1. The freshwater stored in-ground is less than that present in the rivers and lakes of the world.
2. Water shortage is a problem faced by people only in rural areas.
3. Water from rivers is the only source for irrigation in the fields.
4. Rain is the ultimate source of freshwater.

• A and B

• A, B and C

• Only D

• A and C