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प्रश्न
State whether the following statement is true or false :
Bread is an example of solid foam.
विकल्प
True
False
उत्तर
True. Solid foam allows the gas to get dispersed in solid medium.
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संबंधित प्रश्न
Write true or false for each statement. Rewrite the false statement correctly.
Matter cannot exist in different states.
Out of solids, liquids and gases, which one has :
- maximum movement of particles ?
- maximum interparticle attractions ?
- minimum spaces between particles ?
Which of the following is a mixture ?
Salt, Air, Water, Alum, Sugar
Fill in the following blanks with suitable words :
The elements which are sonorous are called ..........................
What are (i) metals (ii) non-metals, and (iii) metalloids ? Give two examples each of metals, non-metals and metalloids.
The element which is not common between the compounds called baking soda and soda ash is
Which one of the following is not a metalloid ?
Define Aerosol Give one example.
Name the process which can be used to recover salt from an aqueous salt solution.
How will you separate a mixture containing sand and sugar ?
How is scrap iron separated from a heap of waste materials in factories?
A solid mixture contains four constituents P, Q, R and S. P consists of tiny grains and it is mixed with
cement for plastering the walls. Q is a white solid which is recovered on a large scale from sea water by the
process of evaporation. R is in the form of tiny particles of a material whose corrosion is called rusting. And
S is a white solid which is used in making ordinary dry cells.
- What could P, Q, R and S be ?
- How would you separate a mixture containing P, Q, R and S ?
Explain the meaning of the term ‘matter’.
What's the solution?
We need to rub salt on a corncob, but only salt crystals are available.
Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions
Complete the following table:
| S.No. | CELSIUS | KELVIN |
| 1. | 90°C | 363 K |
| 2. | ______ | 283 K |
| 3. | 63 °C | ______ |
| 4. | 250°C | ______ |
| 5. | ______ | 303 K |
Liquids have ______.
The pressure of gases does not depend on the temperature of the gas and the volume it occupies.
