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प्रश्न
What is greenhouse effect?
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उत्तर
The trapping of solar heat energy in earth’s atmosphere is called greenhouse effect.
संबंधित प्रश्न
Name two important processes supported by oxygen present in air.
Define the following:
Respiration
State whether the following statement is ‘true’ or ‘false’. If false write the correct statement.
Air is a mixture and not a compound since the components of air cannot be separated by physical methods.
Air has variable composition and hence there is ______ oxygen at lower altitudes than at higher altitudes.
Fill in the blank:
Rusting is a chemical reaction which involves _____ oxidation.
Air has no ______ & ______.
Cool and soothing wind: Breeze.
uproot trees wind: ______.
Wind does not help in the movement of which of the following?
Paheli kept some water in a beaker for heating. She observed that tiny bubbles appeared before the water started to boil. She boiled the water for about 5 minutes and filled it in a bottle up to the brim and kept the bottle air tight till it cooled down to room temperature.
Why did the tiny bubbles appeared?
Paheli kept some water in a beaker for heating. She observed that tiny bubbles appeared before the water started to boil. She boiled the water for about 5 minutes and filled it in a bottle up to the brim and kept the bottle air tight till it cooled down to room temperature.
Do you think tiny bubbles will appear on heating the water taken out from the bottle? Justify your answer.
