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Olympiad Test: Electric Current And Its Effects


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20 Questions MCQ Test Science Olympiad Class 7 | Olympiad Test: Electric Current And Its Effects

Olympiad Test: Electric Current And Its Effects for Class 7 2022 is part of Science Olympiad Class 7 preparation. The Olympiad Test: Electric Current And Its Effects questions and answers have been prepared according to the Class 7 exam syllabus.The Olympiad Test: Electric Current And Its Effects MCQs are made for Class 7 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Olympiad Test: Electric Current And Its Effects below.
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Olympiad Test: Electric Current And Its Effects - Question 1

The shorter, thicker vertical line in the symbol of a cell represents

Olympiad Test: Electric Current And Its Effects - Question 2

‘The wire of greater resistance produces greater amount of heat energy’. Is the statement true?

Olympiad Test: Electric Current And Its Effects - Question 3

An electric circuit is a path along which an electric current may flow. The main parts of an electric circuit are

Olympiad Test: Electric Current And Its Effects - Question 4

Which of the following is an electrical conductor

Detailed Solution for Olympiad Test: Electric Current And Its Effects - Question 4

Silver is a metal and a good conductor of electricity. 

Olympiad Test: Electric Current And Its Effects - Question 5

In which circuit will the bulb or bulbs glow the brightest?

Detailed Solution for Olympiad Test: Electric Current And Its Effects - Question 5

The chemical energy stored in two cells is more than one. The electrical energy used by one bulb is less than the energy used by two bulbs. So the bulb in the circuit that has one bulb and two cells will glow the brightest. 

Olympiad Test: Electric Current And Its Effects - Question 6

A material that does not allow electricity to flow through it is called a/an

Olympiad Test: Electric Current And Its Effects - Question 7

Why is electrical wiring usually covered with a layer of plastic?

Detailed Solution for Olympiad Test: Electric Current And Its Effects - Question 7

Plastic is good insulator of electricity and makes it possible to work with wires without any harm/ injury. 

Olympiad Test: Electric Current And Its Effects - Question 8

The heating element in heater, toaster etc. is made of an alloy of

Olympiad Test: Electric Current And Its Effects - Question 9

The bulb in the circuit given here does not glow. Which labeled part is responsible for this?

Detailed Solution for Olympiad Test: Electric Current And Its Effects - Question 9

The labelled part 3 is responsible, as same charged terminals are connected together.
Two similar terminals, if connected together does not allow electric current to flow through.

Olympiad Test: Electric Current And Its Effects - Question 10

Electromagnetic i nduction was first discovered by

Olympiad Test: Electric Current And Its Effects - Question 11

The requirement of a fuse is that it must be a/an

Olympiad Test: Electric Current And Its Effects - Question 12

Electric generators are based on the principle of

Olympiad Test: Electric Current And Its Effects - Question 13

Which of the following statements regarding an electromagnet is NOT true?

Detailed Solution for Olympiad Test: Electric Current And Its Effects - Question 13

It is a temporary magnet which works only in the presence of electricity.  

Olympiad Test: Electric Current And Its Effects - Question 14

In which of the following arrangements, bulb will be able to glow?

Olympiad Test: Electric Current And Its Effects - Question 15

Compass needle show deflection when

Olympiad Test: Electric Current And Its Effects - Question 16

Which of following is the symbol for a bulb? 

Olympiad Test: Electric Current And Its Effects - Question 17

Rizvi has connected two bulbs across two cells in a simple circuit. How can he make the bulbs dimmer?

Detailed Solution for Olympiad Test: Electric Current And Its Effects - Question 17

Using a cork in the circuit will break it, since it is an insulator. Removing one of the cells will reduce the flow of electricity and make the bulbs dimmer. 

Olympiad Test: Electric Current And Its Effects - Question 18

Why is electrical wiring usually made from copper and not silver?

Detailed Solution for Olympiad Test: Electric Current And Its Effects - Question 18

Silver is also better conductor, nonmagnetic but expensive material. 

Olympiad Test: Electric Current And Its Effects - Question 19

Study the circuit shown her; which switch, if opened, will cause the light bulb to stop glowing?

Olympiad Test: Electric Current And Its Effects - Question 20

Which of the following instruments is used to check whether electricity is flowing through a substance or not?

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