Advertisements
Advertisements
प्रश्न
Give reason why copper metal is used for making electric wires.
Advertisements
उत्तर
Copper is a good conductor of electricity. It is ductile and less expensive; therefore, it is used for making electrical wires.
APPEARS IN
संबंधित प्रश्न
Name one solid, one liquid and one gaseous non-metal.
What is the general name of the materials which contain at least two pure substances and show the properties
of their constituents ?
Fill in the following blanks with suitable words :
Brass is an alloy which is considered a ..............
What happens when the temperature of a saturated sugar solution is increased ?
Choose one term from the following which includes the other three :
aerosol, emulsion, colloid, sol
Define solute.
Name the different types of solutions. Give one example of each.
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.
What is a suspension ? Give two examples of suspensions.
When the solid A is added to water, it dissolves with the evolution of a lot of heat and making little explosions to form two products B and C. The properties of products B and C are entirely different from those of solid A as well as water. Moreover, products B and C cannot be reconverted into solid A and water. When another solid D is added to water, it dissolves with the absorption of a little heat to form a product E which cools down. The product E shows the properties of both, solid D as well as water. Moreover, product E can be converted into solid D and water.
(a) What type of change occurs when solid A is dissolved in water ? Why ?
(b) What type of change occurs when solid D is dissolved in water ? Why ?
(c) Name a metal which you think could behave like solid A. Also name the products B and C.
(d) Name the solid D if it is the one which is used in making ordinary dry cells.
(e) Name the process by which D can be recovered from E.
A carpenter wants to separate iron nails from saw-dust. Which method of separation should he choose ?
How can you obtain pure water from a salt-water mixture (or salt-solution) ? Draw a neat and labelled diagram of the apparatus you would use to obtain pure water from a salt-water mixture (or salt-solution).
The material which is added to water during purification process at the water works so as to disinfect it is :
Differentiate between the-two characteristics of matter – ‘mass’ & ‘weight’.
Matter is made up of ______.
Complete the given analogy.
Murukku from hot oil: ______:: Coffee powder residue from decoction: ______
Diffentiate between absorption and adsorption.
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
Solid is an arrangement of particles ______.
Define the term matter.
