Advertisements
Advertisements
प्रश्न
Explain why steel is used to make railway lines.
उत्तर
Steel is used to make railway lines because the particles of steel have fixed positions and show no free movement. This ensures that there will be no change in the shape of the railway lines, which makes it safe to travel.
APPEARS IN
संबंधित प्रश्न
Intermolecular space is maximum in .......... less in ............ and the least in .........
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?
Which type of elements, metals or non-metals, show the property of brittleness ?
Classify the following into elements and compounds :
- H2O
- He
- Cl2
- CO
- Co
Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.
What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.
Define a compound. Give two points of evidence to show that sodium chloride is a compound.
You are given two liquids, one a solution and the other a compound. How will you distinguish the solution from the compound ?
What is meant by (i) elements (ii) compounds, and (iii) mixtures ?Write down the names of two elements, two compounds and two mixtures.
You have been given a suspension and a solution. How could you tell the difference between them by their appearance ?
How is scrap iron separated from a heap of waste materials in factories?
Pure copper sulphate can be obtained from an impure sample by the process of :
Matter is made up of ______.
State whether true or false. If false, correct the statement.
Oil and water are immiscible with each other.
Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions
Evaporation does form bubbles.
The phenomenon of Evaporation takes place at the ______ of a liquid.
Define the term matter.
Write a scientific reason.
Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.
