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प्रश्न
Gases have definite volume but no definite shape.
विकल्प
True
False
उत्तर
False.
Correct Gases have neither definite volume nor a definite shape.
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संबंधित प्रश्न
Define the term matter. What is it composed of?
Fill in the blank :
The substances which can flow are called ________
A, B and C are all liquids. Liquid A has a comparatively low boiling point. On heating, liquid A vaporises completely without leaving behind any residue. Liquid A is being used increasingly as a fuel in motor vehicles either alone or by mixing with petrol. Liquid B has a very high boiling point. It also vaporises completely on heating, without leaving any residue. Liquid B is a conductor of electricity and used in making thermometers. Liquid C has a moderate boiling point. On heating, liquid C vaporises leaving behind a white solid D which is used in cooking vegetables. The condensation of vapours from C give a liquid E which turns anhydrous CuSO4 to blue.
(a) Which liquid could be an element ? Name this element.
(b) Which liquid could be a mixture ? Name this mixture.
(c) Which liquid could be a compound ? Name this compound.
(d) What could the solid D be ?
(e) What do you think is liquid E ?
State whether the following statement is true or false :
Sponge is an example of solid sol.
Define Aerosol Give one example.
Describe a method to separate a mixture of common salt and sand.
The boiling point of liquid argon is :
Match the physical quantities given in column A to their S I units given in column B:
| (A) | (B) | ||
| (a) | Pressure | (i) | cubic metre |
| (b) | Temperature | (ii) | kilogram |
| (c) | Density | (iii) | pascal |
| (d) | Mass | (iv) | kelvin |
| (e) | Volume | (v) | kilogram per cubic metre |
Rusting of an article made up of iron is called
Which of the following are homogeneous in nature?
(i) ice
(ii) wood
(iii) soil
(iv) air
