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प्रश्न
You want to wear your favourite shirt to a party, but the problem is that it is still wet after a wash. What steps would you take to dry it faster?
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उत्तर
The process of drying the shirt can be made faster in the following ways:
- Spread the shirt to increase the surface area which will increase the rate of evaporation.
- Put it in the sun to increase the temperature to increase the rate of evaporation.
- Keep it under the fan to increase the wind speed which increases the rate of evaporation.
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संबंधित प्रश्न
Fill in the blank :
The state of matter with definite volume and definite shape is called______
Classify the following into elements, compounds and mixtures:
- Sodium
- Soil
- Sugar solution
- Silver
- Calcium carbonate
- Tin
- Silicon
- Coal
- Air
- Soap
- Methane
- Carbon dioxide
- Blood
When a crystal of potassium permanganate is placed in a beaker, its purple colour spreads throughout the water. What does this observation tell us about the nature of potassium permanganate and water?
Name one element, one compound and one mixture.
What are (i) metals (ii) non-metals, and (iii) metalloids ? Give two examples each of metals, non-metals and metalloids.
What are the three general classes of matter ? Give one example of each type.
State whether colloidal solutions are homogeneous or heterogeneous.
One of the following liquids will leave behind a residue on heating. This one is :
What type of magnet is fitted on a crane to separate scrap iron objects from a heap of waste materials in factories ?
Name the process which can be used to recover salt from an aqueous salt solution.
How would you separate iodine from a mixture of iodine and common salt ?
Tincture of iodine is a mixture of two materials X and Y. The material Y has a property that its solid form can be converted directly into vapours on heating by a process called Z.
- What could X be ?
- What could Y be ?
- Name the process Z.
- Which process would you use to recover both the components X and Y from tincture of iodine ?
- Which process can be used to recover only component Y from tincture of iodine ?
Asmita went to buy an earthen pot. There she saw many things kept for sale.
From what substance has the potter made all the things?
Complete the given analogy.
Murukku from hot oil: ______:: Coffee powder residue from decoction: ______
The property which allows the metals to be hammered into their sheets is ______.
______ is a smallest particle.
Which among the following is not a matter?
The non S I and S I units of some physical quantities are given in column A and column B respectively. Match the units belonging to the same physical quantity:
| (A) | (B) | ||
| (a) | degree celsius | (i) | kilogram |
| (b) | centimetre | (ii) | pascal |
| (c) | gram per centimetre cube | (iii) | metre |
| (d) | bar | (iv) | kelvin |
| (e) | milligram | (v) | kilogram per metre cube |
Write a scientific reason.
Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.
Define the term matter.
