To electroplate an article with nickel requires the article to be placed at ........
Choosing only words from the following list write down the appropriate words to fill in the blanks below (anions, anode, cathode, cationa, electrode, electrolyte, nickel, voltameter)To electroplate an article with nickel requires an:
If you pass current through copper sulphate solution, copper gets deposited on the plate connected to ______terminal of the battery. FIll in the blank.
LED glows even when a ______ electric current passes through it. Fill in the blank.
We can expect that pure water normally _________ electricity. Fill in the blank.
Copy and complete the following sentences ?
With platinum electrodes hydrogen is liberated at the ........... and oxygen at the .......... during the electrolysis of acidified water.
|Silver plating a spoon||Solution of potassium argentocyanide|
|Purification of copper|
Acidified water is electrolysed by using carbon electrodes. What is produced at positive carbon electrode?
Seema had heard that rainwater is as good as distilled water. So she collected some rainwater in a clean glass tumbler and tested it using a tester. To her surprise, she found that the compass needle showed deflection. What could be the reasons?
The whole apparatus used for electrolysis is termed as :
The outlets in your home provide.
Metals are good conductors because
State whether true or false :
The current obtained by the primary and the secondary cells is direct current.
During the process of electrolysis of water, dilute sulphuric acid splits into
Around which electrode, (positive or negative electrode) the coloured spot is formed.
The above happens due to which effect of an electric current?
Microscopes are used for magnification:
Telescopes are used to obtain an .................. image of a ........... object.
|A.||Microscope||1.||To see objects on the surface by an observer in a trench|
|B.||Telescope||2.||To see small objects|
|C.||Periscope||3.||To see distant objects|
|D.||Camera||4.||To take photographs of objects|
Draw a concept map using the following terms.(lens, real image, virtual image, optical instrument, camera, microscope, telescope)
How does the defect of myopia arise in a human eye?
What gives a perception of depth or three dimensional vision to human eye ?
If a person cannot see an object clearly when it is placed at about 25 cm away from him, he is suffering from:
Cornea is a part of which of the following organs of human body ?
Choose the correct options.
Having two eyes facilitates in:
A. Increasing the field of view
B. Giving 3 dimensional view
C. Developing the concept of distance / size.