Clear nights are colder than cloudy nights because of

Consider the following statements about Nimbus clouds:
1. These are thick dark - grey or black clouds
2. They are found at very low height
3. They bring sharp showers, and rumble with lightning and thunder
Which of the above statements are true?

Instrument used to measure temperature is termed as

Which one of the following warm ocean currents replaces the Peruvian cold currents?

Horizontal transfer of heat through the wind is

Which one of the following is a local wind?

The reasons for temperature variations are

The amount of solar energy received by the earth is called:

Annual average position of the Thermal equator is 5° North latitude. What could be possible reason that thermal equator is in Northern hemisphere?

1. The distribution of continents is uneven
2. Insolation from sun is more in northern hemisphere on an average
Which among the above is / are correct?

The primary source of energy on earth is