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Important Questions Test: Electric Current & its Effects - Class 7 MCQ


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15 Questions MCQ Test Science Class 7 - Important Questions Test: Electric Current & its Effects

Important Questions Test: Electric Current & its Effects for Class 7 2024 is part of Science Class 7 preparation. The Important Questions Test: Electric Current & its Effects questions and answers have been prepared according to the Class 7 exam syllabus.The Important Questions Test: Electric Current & its Effects MCQs are made for Class 7 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Important Questions Test: Electric Current & its Effects below.
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Important Questions Test: Electric Current & its Effects - Question 1

Why are symbols used for electronic components?

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 1

It makes it easier to draw the circuit diagrams

Important Questions Test: Electric Current & its Effects - Question 2

An electric bell contains:

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 2
An electric bell uses an electromagnet to create a magnetic field when current flows through it. This magnetic field moves a striker to hit the bell, producing sound.
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Important Questions Test: Electric Current & its Effects - Question 3

When electricity is passed through a coil

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 3

When an electric current is passed through the wire of the coil to generate a magnetic field, or conversely an external time-varying magnetic field through the interior of the coil generator and energy is also lost in the form of heat.

Important Questions Test: Electric Current & its Effects - Question 4

Key or switch in circuit is placed:

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 4

The key or switch can be placed anywhere in the circuit. When the switch is in the 'ON' position, the circuit from the positive terminal of the battery to the negative terminal is complete.

Important Questions Test: Electric Current & its Effects - Question 5
The thin wire in a bulb that glows when an electric current passes through it is called the ______.
Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 5
The thin wire in a bulb that lights up when electricity flows through it is called the filament. It glows and produces light when the electric current passes through it.
Important Questions Test: Electric Current & its Effects - Question 6

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

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 6

Tester is used to check whether electricity is flowing through a substance.

Important Questions Test: Electric Current & its Effects - Question 7

What happens to the strand of steel wool when a large electric current passes through it?

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 7
  • When a large electric current passes through the strand of steel wool, it melts and breaks. This is because some special materials, like the steel wool, cannot handle the high electric current and end up melting and breaking
Important Questions Test: Electric Current & its Effects - Question 8

The primary cell which is used in daily life is

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 8

Dry cells are more durable, they are typically used for remote controls, flashlights and other similar handheld devices.

Important Questions Test: Electric Current & its Effects - Question 9

Electric current is measured by a device called

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 9

An ammeter is an instrument used for measuring electric current in units of amperes. An ammeter must be connected in series with the path of the current being measured.

Important Questions Test: Electric Current & its Effects - Question 10
In an electric bell, what causes the circuit to break?
Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 10
In an electric bell, the circuit breaks when the electromagnet pulls the iron strip away from the contact screw. This stops the current flow, causing the coil to lose its magnetic properties until the iron strip returns to its original position.
Important Questions Test: Electric Current & its Effects - Question 11
What is a disadvantage of using incandescent electric bulbs?
Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 11
Incandescent electric bulbs are less efficient because they produce heat in addition to light. This heat production leads to a waste of electricity, making them less desirable compared to more efficient lighting options like fluorescent tube-lights, CFLs, and LED bulbs.
Important Questions Test: Electric Current & its Effects - Question 12
Which of the following materials cannot be separated using an electromagnet?
Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 12
Electromagnets can only attract magnetic materials such as iron, steel, and nickel. Plastic, being a non-magnetic material, cannot be separated using an electromagnet.
Important Questions Test: Electric Current & its Effects - Question 13
What can cause an overload in an electrical circuit?
Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 13
Overloading an electrical circuit can occur when too many devices are connected to a single socket. This can result in excessive current flow, which can lead to overheating and potentially cause fires.
Important Questions Test: Electric Current & its Effects - Question 14
What can cause a short circuit in electrical circuits?
Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 14
A short circuit can occur when wires with worn-out insulation come into direct contact with each other. This can cause excessive currents in the circuit, leading to potential hazards such as fires.
Important Questions Test: Electric Current & its Effects - Question 15

An electric cell has a _____ terminal and a _____ terminal.

Detailed Solution for Important Questions Test: Electric Current & its Effects - Question 15

An electric cell has a positive terminal and a negative terminal. The longer line in the symbol represents the positive terminal, and the thicker, shorter line represents the negative terminal. This helps us know which way to connect the cell in a circuit.

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