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प्रश्न
Write ‘True’ or ‘False’ in front of following statement.
Enamelling is the process of baking a mixture of silicates on the surface of aluminium at a high temperature.
विकल्प
True
False
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उत्तर
False.
Enamelling is the process of baking a mixture of silicates on the surface of iron at a high temperature.
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संबंधित प्रश्न
Fill in the blank :
________ is the most abundant inert gas present in air.
Tabulate the various components of air, including the components with variable composition.
What is the percentage of oxygen in air?
_______ can be seen moving in a beam of sunlight in a dark room.
When air is moving with cool and soothing, it is called a cyclone.
Metals like magnesium, iron, and sodium burn in oxygen and give basic ______.
Match the following
| 1. | Nitrogen | a. | Acid rain |
| 2. | CO2 | b. | Global warming |
| 3. | Melting of glaciers | c. | Volcanic gases |
| 4. | Corrosion of bridges | d. | Aerated drinks |
Assertion: Carbon dioxide occurs as carbonates in nature.
Reason: Carbon dioxide can exist as a liquid at atmospheric pressure.
Boojho took an empty plastic bottle, turned it upside down and dipped its open mouth into a bucket filled with water. He then tilted the bottle slightly and made the following observations.
- Bubbles of air came out from the bottle.
- Some water entered the bottle.
- Nitrogen gas came out in the form of bubbles and oxygen got dissolved in water.
- No bubbles formed, only water entered the bottle.
Which observations is/are correct?
A list of words is given in a box. Use appropriate words to fill up the blank in the following statement.
A weather cock shows the ______ in which the air is moving at that place.
