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Question 1
FILL IN THE BLANKS:
- __________ are the smallest units of matter.
- The flow of electrons from the negative terminal of a source to the positive terminal in a closed circuit is called ____________.
- ________ are materials that permit electrons to flow freely from particle to particle.
- _________is the process of coating a metal with a thin layer of another metal by electrolysis.
- __________ and __________ are examples of the electrolytes.
Solution
- Atoms
- Electric current
- Conductor
- Electroplating
- Sodium and magnesium
Question 2
STATE THE FOLLOWING AS TRUE OR FALSE:
- Gold and steel are the example of conductor.
- Electrodes are commonly made of metals such as platinum and zinc.
- Electroplating is the process by which water is decomposed into oxygen and hydrogen gas.
- Electrical conductivity involves a flow of current of free neutrons through a solid body.
- Pure form of water is a good conductor or electricity.
Solution
- True
- True
- False
- False
- False
Question 3
UNSCRAMBLE THE FOLLOWING WORDS:
- ELCETRNOS
- TAOM
- UCRERNT
- NAODE
- SUNIALROT
Solution
- ELECTRONS
- ATOM
- CURRENT
- ANODE
- INSULATOR
Question 4
Name of the following:
- The smallest units of matter.
- Positively charged particles.
- The flow of positive charges from the positive terminal to the negative terminal.
- A substance that conducts electricity when dissolved in water.
- Electric iron is the example of.
- Electrode where the oxidation takes place.
- The process which is used in industry for the production of oxygen and hydrogen gases.
- Objects that do not allow electricity to pass through them.
- Negatively charged particle by which a nucleus is surrounded.
- During the process of electrolysis changes occur.
Solution
- Atom
- Protons
- Conventional current
- Electrolyte
- Heating effect of electric current
- Anode
- Electrolysis
- Insulators
- Electrons
- Chemical
Question 5
Very short answer type questions:
(i)Give any two examples of conductor.
(ii)What is anode?
(iii)What is atom?
(iv)Name of particle of an atom ?
(v)Give any two example of non-electrolyte?
Solution
(i)Silver and Sea water
(ii)The anode is the electrode where the electricity moves into.
(iii)An atom is the smallest unit of ordinary matter.
(iv)Protons, electrons and neutrons.
(v)Sugars and alcohols.
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