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प्रश्न
Gases have definite volume but no definite shape.
विकल्प
True
False
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उत्तर
False.
Correct Gases have neither definite volume nor a definite shape.
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संबंधित प्रश्न
Name the property which allows metals to be hammered into thin sheets.
What is the general name of the materials which contain at least two pure substances and show the properties
of their constituents ?
Classify the following into metals, non-metals and metalloids:
Silicon, Mercury, Diamond, Sulphur, Iodine, Germanium, Sodium, Carbon, Magnesium, Copper, Boron, Helium
State whether the following statement is true or false :
Bread is an example of solid foam.
Which of the following is not an emulsion ?
A carpenter wants to separate iron nails from saw-dust. Which method of separation should he choose ?
The given mixture contains three constituents A, B and C. The constituent A is a yellow coloured, solid element which dissolves in a liquid D. The constituent B is a blue coloured salt which is insoluble in liquid D but dissolves easily in another liquid E. The constitudent C is a liquid which is used in cooking food and forms a solid fat on hydrogenation.
(a) What do you think could (i) constituent A, and (ii) liquid D be ?
(b) What could (i) constituent B, and (ii) liquid E be ?
(c) What could liquid C be ?
(d) How will you separate the mixture containing A, B and C ?
Which of the following statements are true for pure substances?
(i) Pure substances contain only one kind of particles
(ii) Pure substances may be compounds or mixtures
(iii) Pure substances have the same composition throughout
(iv) Pure substances can be exemplified by all elements other than nickel
Evaporation is always accompanied by ______ in temperature.
Define the term matter.
