Advertisements
Advertisements
प्रश्न
In a number of musical instruments, air plays an important role. Can you name some such instruments?
Advertisements
उत्तर
Such instruments are flute, mouth organ, trumpet, shehnai and harmonium.
APPEARS IN
संबंधित प्रश्न
Match the statements in Column A, with those in Column B.
| Column A | Column B |
| 1. Largest Constituent of air, which dilutes the activity of oxygen. | (a) Oxygen |
| 2. A gas used for filling weather observeation balloons. | (b) Carbonic acid |
| 3. An acid formed by the dissolution of sulphur dioxide gas in water. | (c) Sulphuric acid |
| 4. An acid formed by the dissolution of carbon dioxide in water. | (d) Helium |
| 5. A gas vital for respiration. | (e) Nitrogen |
Name three greenhouse gases.
Tick (√) the correct alternative from the choice given for the following statement.
Photosynthesis is a process in which plants
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.
Why is it said that-
Air is a homogeneous mixture of various gases.
What is wind energy?
Mention two advantages of wind energy.
Take a squeezable bottle. Make a hole on the lid and close the bottle tightly. Bring the bottle near your face and press the bottle. What do you feel?
The composition of air is always exactly the same.
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.
