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
Name the terms for the change of a solid into liquid.
Fill in the blank
Any matter which has a definite _______ but no definite shape is called a _______
When a gas jar containing air is inverted over a gas jar containing bromine vapour, the red-brown bromine vapour diffuse into air. Explain how bromine vapour diffuse into air.
Name a non-metal which is a good conductor of electricity.
Which of the following are ‘pure substances’ ?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, Brick, Wood, Air
State two physical properties on the basis of which metals can be distinguished from non-metals.
Name a metal which has a low melting point.
Draw a flow-chart for the schematic representation of different types of matter.
In the following set of substances, one item does not belong to the set. Select this item and explain why it does not belong to the set :
Hydrogen, Oxygen, Steam, Chlorine
Differentiate between a saturated and an unsaturated solution. How will you test whether a given solution is saturated or not ?
How would you prepare a saturated solution of sodium chloride in water at 25°C ? What will happen if this solution is cooled to 10°C ?
State whether the following statement are true or false :
Alcohol can be separated from a mixture of alcohol and water by a separating funnel.
State whether the following statement are true or false :
Salt and water can be recovered from an aqueous salt solution by the process of evaporation.
Fill in the following blanks with suitable words :
Miscible liquids are separated by .....................
Name one pair of liquids which can be separated by using a separating funnel.
Select the correct answer from A, B, C, D & E for the statement given below:
An atom or group of atoms _________ having a resultant charge.
Rusting of an article made up of iron is called
Solids do not flow.
The fluidity of solids: ______.
Define the term matter.
