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Olympiad Test: Chemical Effects Of Electric Current


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20 Questions MCQ Test Science Class 8 | Olympiad Test: Chemical Effects Of Electric Current

Olympiad Test: Chemical Effects Of Electric Current for Class 8 2022 is part of Science Class 8 preparation. The Olympiad Test: Chemical Effects Of Electric Current questions and answers have been prepared according to the Class 8 exam syllabus.The Olympiad Test: Chemical Effects Of Electric Current MCQs are made for Class 8 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Olympiad Test: Chemical Effects Of Electric Current below.
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Olympiad Test: Chemical Effects Of Electric Current - Question 1

Plastic wire is

Detailed Solution for Olympiad Test: Chemical Effects Of Electric Current - Question 1 Plastic wire is an insulator because it doesn't conduct heat.
Olympiad Test: Chemical Effects Of Electric Current - Question 2

Electroplating is based on:

Olympiad Test: Chemical Effects Of Electric Current - Question 3

Adding common salt to distilled water makes it:

Olympiad Test: Chemical Effects Of Electric Current - Question 4

An electrolyte is:

Olympiad Test: Chemical Effects Of Electric Current - Question 5

Copper wire is a:

Olympiad Test: Chemical Effects Of Electric Current - Question 6

Poor conductors are

Olympiad Test: Chemical Effects Of Electric Current - Question 7

Distilled water is

Detailed Solution for Olympiad Test: Chemical Effects Of Electric Current - Question 7

Distilled water is a poor conductor  of electricity because it doesn't contain any dissolved salts in it which can provide it ions to conduct electricity.

Olympiad Test: Chemical Effects Of Electric Current - Question 8

 Flow of electrons is called

Detailed Solution for Olympiad Test: Chemical Effects Of Electric Current - Question 8

Electricity is a term used to describe the energy produced (usually to perform work) when electrons are caused to directional (not randomly) flow from atom to atom. In fact, the day-to-day products that we all benefit from, rely on the movement of electrons. This movement of electrons between atoms is called electrical current. 

Olympiad Test: Chemical Effects Of Electric Current - Question 9

 Electroplating prevents

Olympiad Test: Chemical Effects Of Electric Current - Question 10

An electric lamp glows due to

Detailed Solution for Olympiad Test: Chemical Effects Of Electric Current - Question 10 When electric current passes through a bulb, the filament of the bulb heats up to a high temperature. This is called heating effect of current. The temperature is so high that it starts glowing. 

However, if the current through a circuit is weak, the filament does not get heated up sufficiently and it does not glow. 
Olympiad Test: Chemical Effects Of Electric Current - Question 11

Plastics are the good conductor of electricity.

Olympiad Test: Chemical Effects Of Electric Current - Question 12

Flow of electrons is called electric current.

Olympiad Test: Chemical Effects Of Electric Current - Question 13

Distilled water also conducts the electric current.

Detailed Solution for Olympiad Test: Chemical Effects Of Electric Current - Question 13 Distilled water which is a pure form of water, is neither acidic nor basic in nature. So distilled water does not dissociate into ions. Since, conduction of electricity requires free ions so, distilled water does not conduct electricity.
Olympiad Test: Chemical Effects Of Electric Current - Question 14

Circuit is the closed path through which current flows.

Detailed Solution for Olympiad Test: Chemical Effects Of Electric Current - Question 14

The correct option is A.
circuit A path through which electric charges flow. A continuous, unbroken path through which electrons can flow is a closed circuit. Charges, or current, can flow only through a closed circuit. A break or opening in a circuit creates an open circuit.

Olympiad Test: Chemical Effects Of Electric Current - Question 15

 Electric bulb glows due to chemical effect of electricity.

Detailed Solution for Olympiad Test: Chemical Effects Of Electric Current - Question 15

The electric bulb has a filament called tungsten when electricity passes through this filament, it heats up and glows. This heat is generated due to the passage of electric current and the drift of electrons due to the current and the resistance it causes.
Hence, the glowing of electric bulb is based on the heating effect of electric current.

Olympiad Test: Chemical Effects Of Electric Current - Question 16

Copper wire is poor conductor of electricity.

Olympiad Test: Chemical Effects Of Electric Current - Question 17

 LED is an electric bulb which is used in a tester.

Olympiad Test: Chemical Effects Of Electric Current - Question 18

 Electricity shows magnetic effect

Olympiad Test: Chemical Effects Of Electric Current - Question 19

When salt is dissolved in distilled water, it does not conduct electricity.

Olympiad Test: Chemical Effects Of Electric Current - Question 20

Electroplating  is  based  on  the  heating  effect  of  electricity.

Detailed Solution for Olympiad Test: Chemical Effects Of Electric Current - Question 20

The process of depositing a thin layer of a desired metal over a metal object with the help of electric current is called electroplating. So, Electroplating is based on chemical effect of electricity.

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