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प्रश्न
Name a liquid which can be classified as a pure substance and conducts electricity.
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उत्तर
Mercury is a liquid metal that can be classified as a pure substance and a good conductor of electricity.
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संबंधित प्रश्न
Solids have definite shape and definite volume.
Define matter.
Name the terms for the particles of matter which may or may not have independent existence.
Fill in the blank
Liquids have a definite ______
Classify the following into elements, compounds and mixtures:
- Sodium
- Soil
- Sugar solution
- Silver
- Calcium carbonate
- Tin
- Silicon
- Coal
- Air
- Soap
- Methane
- Carbon dioxide
- Blood
State two characteristics of matter demonstrated by Brownian motion.
What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.
Give reason why copper metal is used for making electric wires.
You are given two liquids, one a solution and the other a compound. How will you distinguish the solution from the compound ?
Name a metal which has a low melting point.
Fill in the following blank :
Milk is a .................... solution but vinegar is a .................... solution.
Classify the following into true solutions and colloidal solutions:
Ink, Salt solution, Starch solution, Blood, Sugar solution
Explain what happens when a beam of light is passed through a colloidal solution.
Which of the following is not an emulsion ?
How will you separate camphor, common salt and iron nails from their mixture ?
What is fractional distillation ? What is the use of fractionating column in fractional distillation ?
Differentiate between the-two characteristics of matter – ‘mass’ & ‘weight’.
What's the solution?
We need to rub salt on a corncob, but only salt crystals are available.
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 |
