Advertisements
Advertisements
प्रश्न
Which technique is used in a washing machine to squeeze out water from wet clothes while drying ?
Advertisements
उत्तर
Centrifugation is a technique used in a washing machine to squeeze out water from wet clothes while drying.
APPEARS IN
संबंधित प्रश्न
Match the following
| Column A | Column B | ||
| (a) | Molecules | (i) | Water boils |
| (b) | 100° C | (ii) | Evaporation |
| (c) | 0° C | (iii) | Changes from solid to gas |
| (d) | At all temperatures | (iv) | Matter |
| (e) | Camphor | (v) | Water freezes |
Write true or false for each statement. Rewrite the false statement correctly.
Matter cannot exist in different states.
When a crystal of potassium permanganate is placed at the bottom of water in a beaker, the water in the whole beaker turns purple on its own, even without stirring. This is an example of :
Name one solid, one liquid and one gaseous non-metal.
What is meant by saying that metals are sonorous ?
What are the three general classes of matter ? Give one example of each type.
Which of the following does not have a fixed melting point/boiling point ?
Which of the two will scatter light : soap solution or sugar solution ? Why ?
Which of the following contains less solute at a given temperature and pressure ? Unsaturated solution or Saturated solution.
Classify the following into true solutions and colloidal solutions:
Ink, Salt solution, Starch solution, Blood, Sugar solution
Which of the following will show Tyndall effect ? Why ?
- Salt solution
- Starch solution
- Milk
- Copper sulphate solution
Classify the following into solutions, suspensions and colloids :
Soda-water, Milk, Brine, Blood, Ink, Smoke in air, Chalk water mixture, Milk of Magnesia, Shaving cream, Muddy river water.
A carpenter wants to separate iron nails from saw-dust. Which method of separation should he choose ?
Describe a method to separate a mixture of common salt and sand.
How will you separate a mixture of common salt, sulphur powder and sand ?
The dyes present in fountain pen ink can be separated by the technique of :
Which of the following cannot be separated from air by the process of fractional distillation ?
Differentiate between the-two characteristics of matter – ‘mass’ & ‘weight’.
Boiling refers to the process by which a substance changes from the liquid to the gaseous state at its ______ point.
