Advertisements
Advertisements
प्रश्न
What name is given to those elements which are neither good conductors of electricity like copper nor insulators like sulphur ?
Advertisements
उत्तर
Elements that are neither good nor bad conductors of electricity, are called semi conductors.
APPEARS IN
संबंधित प्रश्न
Fill in the blank
All matter is made up of tiny particles 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 extremely small particles X derived from the anther of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig-zag way. It was also observed that warmer the liquid Y, faster the particles X moved on its surface.
- What could particles X be ?
- What do you think liquid Y is ?
- What is the zig-zag movement of X known as ?
- What is causing the zig-zag movement of particles X ?
- Name the scientist who discovered this phenomenon.
- What does this experiment tell us about the nature of liquid Y?
Which one of the following is not a metalloid ?
Which of the following statements are true for pure substances ?
- pure substances contain only one kind of particles
- pure substances may be compounds or mixtures
- pure substances have the same composition throughout
- pure substances can be exemplified by all elements other than nickel
Out of a colloid, solution and a suspension :
which one has the smallest particles ?
How much water should be added to 15 grams of salt to obtain 15 per cent salt solution ?
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 will happen if a saturated solution is :
- heated
- cooled
Name the property of one of the constituents which can be used to separate a mixture of salt and iodine
What difference in the properties of oil and water enable their separation by a separating funnel ?
Describe a method to separate a mixture of common salt and sand.
Pure copper sulphate can be obtained from an impure sample by the process of :
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.
Complete the given analogy.
Murukku from hot oil: ______:: Coffee powder residue from decoction: ______
Liquids cannot be compressed and they have fixed volume.
The fluidity of solids: ______.
Define the term matter.
