Paheli 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?
Solution and Explanation
Air in our surroundings contains gasses, suspended dust particles and pollutants. These particles gets dissolved in rain water and make it good conducting medium of electricity.
Top Questions on Do Liquids Conduct Electricity?
- Fill in the blanks:
- Most liquids that conduct electricity are solutions of ___, ___ and __.0.
- The passage of an electric current through a solution causes ___ effects.
- If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the ___ terminal of the battery.
- The process of depositing a layer of any desired metal on another material by means of electricity is called ___.
- CBSE Class VIII
- Science
- Do Liquids Conduct Electricity?
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- CBSE Class VIII
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- Do Liquids Conduct Electricity?
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- CBSE Class VIII
- Science
- Do Liquids Conduct Electricity?
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- CBSE Class VIII
- Science
- Do Liquids Conduct Electricity?
Questions Asked in CBSE Class VIII exam
(a) Find out the position of the image of an object situated at A in the plane mirror.
(b) Can Paheli at B see this image?
(c) Can Boojho at C see this image?
(d) When Paheli moves from B to C, where does the image of A move?- CBSE Class VIII
- Multiple Images
- A 5 m 60 cm high vertical pole casts a shadow 3 m 20 cm long. Find at the same time -
(i) the length of the shadow cast by another pole 10 m 50 cm high
(ii) the height of a pole which casts a shadow 5 m long.- CBSE Class VIII
- Direct Proportion
- Identify the part which vibrates to produce sound in the following instruments.
- Dholak
- Sitar
- Flute
- CBSE Class VIII
- Sound is Produced by a Vibrating Body
- The process that you saw in Activity 11.7 is used for purification of copper. A thin plate of pure copper and a thick rod of impure copper are used as electrodes. Copper from impure rod is sought to be transfered to the thin copper plate. Which electrode should be attached to the positive terminal of the battery and why?
- CBSE Class VIII
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- CBSE Class VIII
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Concepts Used:
Electric Current
Defining Electric Current
It is the rate of flow of electrons in a conductor. SI Unit - Ampere (A).
Electrons are negatively charged particles hence when they move a number of charges moves.
Note:- The ability of a particular substance to conduct electricity depends on the number of electrons that are able to move . Some of the materials allow current to flow better than others.
What is an Electromotive Force?
If a force acts on electrons to make them move in a particular direction, then up to some extent random motion of the electrons will be eliminated. An overall movement in one direction. The force which acts on the electrons to move them in a certain direction is known as electromotive force and its quantity is known as voltage and is measured in V.