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प्रश्न
What is it made from? Why?
The sheets used for roofing.
उत्तर
- Plastic and aluminum are the materials that are employed in the production of roofing sheeting.
- Plastic is resistant to atmospheric conditions due to its hardness.
- Plastic is transparent; therefore, sunlight can travel through it.
- Aluminium is a durable, lightweight, and robust material that provides protection against all types of weather.
- Due to its malleability, it can be shaped into thin sheets.
संबंधित प्रश्न
Convert the following temperature to Celsius scale:
300 K
Convert the following temperature to the celsius scale.
470 K
Name one common substance which can be easily changed from one state to another by heating or cooling.
Fill in the following blank with suitable words :
When steam condenses to form water, heat is .......................
How does perspiration or sweating help keep our body cool on a hot day ?
There are four substances W, X, Y and Z. The substance W is a dark violet solid having diatomic molecules. A solution of W in alcohol is used as a common antiseptic C. The substance X is a white solid which is usually recovered from sea water on a large scale. The substance Y is a white solid which is insoluble in water and used in the form of small balls for the safe storage of woollen clothes. The substance Z is a yet another white solid which is used in making commonly used dry cells.
- Name (i) W (ii) X (iii) Y and (iv) Z.
- Out of W, X, Y and Z, which substance/substances can undergo sublimation ?
- Which substance is organic in nature ?
- What is the name of substance C ?
- Which substance belongs to the halogen family ?
Define the following terms: Boiling point
Give two examples of the following:
Substances which do not change their states.
Fill in the blanks with the correct word/s from the bracket.
Ice on absorption of heat converts to ‘X’ a process called ____ [vaporization / melting]. ‘X’ changes to water vapour on ____ [heating / cooling]. Water vapour changes back to ‘X’ on ____ [freezing / condensation]. The constant temperature at which ice changes into ‘X’ is called its ____ [fusion point / melting point / boiling point].
Complete the blank with reference to interconversion of matter on the basis of kinetic theory-with the word ‘increase’, ‘decreases’, ‘gain’, ‘lose’, or ‘overcome’ in the following case.
During vaporization, the liquid particles ____________ energy.
