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प्रश्न
Which technique is used in a washing machine to squeeze out water from wet clothes while drying ?
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उत्तर
Centrifugation is a technique used in a washing machine to squeeze out water from wet clothes while drying.
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संबंधित प्रश्न
Define matter.
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
Classify the following into elements, compounds and mixtures:
- Sodium
- Soil
- Sugar solution
- Silver
- Calcium carbonate
- Tin
- Silicon
- Coal
- Air
- Soap
- Methane
- Carbon dioxide
- Blood
What is the scientific name of particles which make up mater?
Name a metal which is soft and a non-metal which is hard.
Name the property which allows metals to be hammered into thin sheets.
What elements do the following compounds contain ?
Sugar, Common salt
There is a large group of materials P which can be divided into three groups Q, R and S on the basis of their properties. The substances belonging to group Q can be solids, liquids or gases. The solids belonging to group Q are usually electrical insulators. Most of the substances of group R are solids which are good conductors of electricity. The substances belonging to group S are neither insulators like Q nor good conductors like R. The properties of S are intermediate between those of Q and R.
- What could the group of materials P be ?
- Name the substances Q. Give two examples of such substances.
- Name the substances R. Write two examples of such substances.
- Name the substances S. Give two examples of such substances.
- Out of Q, R and S, which substances are malleable and ductile ?
How will you test whether a given solution is a colloidal solution ?
Which of the following represents the solubility of sugar in water at 20°C ?
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 ?
Name one pair of liquids which can be separated by using a separating funnel.
What difference in the properties of common salt and sand would enable you to separate a mixture of these two substances ?
Explain the meaning of the term ‘matter’.
Complete the given analogy.
Murukku from hot oil: ______:: Coffee powder residue from decoction: ______
Solid is an arrangement of particles ______.
The physical state of water at 373 K is ______.
Higher the temperature, the higher the kinetic energy of particles.
Give an example of liquid in gas.
Define the term matter.
