Olympiad Test: Electric Current And Its Effects


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


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Attempt Olympiad Test: Electric Current And Its Effects | 20 questions in 40 minutes | Mock test for Class 7 preparation | Free important questions MCQ to study Science Olympiad Class 7 for Class 7 Exam | Download free PDF with solutions
QUESTION: 1

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

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QUESTION: 2

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

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QUESTION: 3

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

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QUESTION: 4

Which of the following is an electrical conductor

Solution:

Silver is a metal and a good conductor of electricity. 

QUESTION: 5

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

Solution:

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. 

QUESTION: 6

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

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QUESTION: 7

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

Solution:

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

QUESTION: 8

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

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QUESTION: 9

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

Solution:

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.

QUESTION: 10

Electromagnetic i nduction was first discovered by

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QUESTION: 11

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

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QUESTION: 12

Electric generators are based on the principle of

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QUESTION: 13

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

Solution:

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

QUESTION: 14

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

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QUESTION: 15

Compass needle show deflection when

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QUESTION: 16

Which of following is the symbol for a bulb? 

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QUESTION: 17

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

Solution:

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. 

QUESTION: 18

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

Solution:

Silver is also better conductor, nonmagnetic but expensive material. 

QUESTION: 19

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

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QUESTION: 20

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

Solution:
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