At the time of short circuit, the current in the circuit:

An extremely large current can flow in household electric wiring circuit under two circumstances short circuit and overloading. Short circuit is the touching of live wire and neutral wire directly is known as short circuit. And second is when house or some other building is wired, the wiring is protected by fuses. When a short circuit or overloading occurs the flow of current increase heavily, the fuse wire blows out cutting off the “Electric Supply”.

Consider the following statements and choose the correct one:

Here are all the statements are correct. Hence your answer will be option [D].

The filament of an electric bulb is made of a thin wire of:

The electric bulb has very thin filament of tungsten metal. The filament of an electric bulb has a high resistance. When electric current passes through the very thin, high resistance filament of an electric bulb, heat is produced in it. Due to this the filament of electric bulb gets heated to a very high temperature and starts glowing.

The element of an electric iron is made of:

The electric heating appliances (such as electric room heater, electric iron etc.) works on the heating effect of electric current. All the electric heating appliances contains coils of high resistance wire, made of nichrome alloy. A lot of heat is produced in the heating element because it is made of high resistance nichrome-wire and negligible heat is produced in the connecting wires of copper because copper has very low resistance.

When electric current is passed through the filament of a bulb, it gives off:

The electric bulb or electric lamp which we use for producing light works on the heating effect of electric current. An electric bulb is basically used for producing light but it also gives out heat. In fact, a major part of the electricity consumed by the filament of an electric bulb is converted into heat (due to which the bulb becomes hot), only a small part of electricity is converted into light.

In a quiz competition, you are asked a question where you have to choose the statement which is/ are incorrect?

Here are all the statements are correct. Hence your answer will be option [D].

The most suitable material for making the core of an “Electromagnet” is:

The magnet made by using electric current is called an electromagnet. Remember, only iron is used for making electromagnets because when current is switched off in the coil of an “electromagnet made of iron pieces” then the iron piece loses all its magnetism. Steel is not used for making electromagnets because when current is switched off from the coil of an electromagnet made of a steel pieces, it does not lose all its magnetic. The still remains the magnetism and becomes a permanent magnet.

Which of the following statement is or are incorrect?

The symbol for representing a battery for three cells will have three pairs of long and short parallel lines connected to one another.

Circuit Breaker Device which can be used in place of fuse in domestic electric wiring is called:

MCB stand for miniature circuit breaker. These days MCBs or miniature circuit breakers are being used increasingly in household electric wiring, in place of traditional fuses. MCB does not work on the heating effect of current. MCB works on the magnetic effect of current.

Nichrome wire is used in:

The heating elements of most of the electric heating appliances such as, electric iron, electric kettle, electric geyser, electric oven, hot plates and hair dryer etc., cannot be seen by us because they are concealed inside the body of these appliances.

Choose the statement which is not correct in the case of an electric fuse:

In case of electric fuse, there is only a maximum limit on the current which can safely flow in the electric circuit.

In a filament type bulb, a lot of electric energy is wasted in the form of:

The electric bulb or electric lamp which we use for producing light works on the heating effect of electric current. An electric bulb is basically used for producing light but it also gives out heat. In fact, a major part of the electricity consumed by the filament of an electric bulb is converted into heat (due to which the bulb becomes hot), only a small part of electricity is converted into light. The production of heat by an electric bulb is not desirable because it leads to the wastage of electricity.

In the last year board examination, Rahul were asked a question where he had to choose the statement which was/were correct? Will you be able to answer this question?

Here all the statements are correct. Hence your answer will be option [D].

The sound produced in a door bell is due to the:

Electromagnets are used in the construction of a large number of devices like electric bells, loudspeakers, electric motors etc. The electric bell works on the magnetic effect of current. Electromagnet attract the iron armature and the clapper strikes the gong which producing a ringing sound.

Which of the following characteristic is not suitable for a fuse wire?

We use a thin wire in a fuse because it has a much greater resistance than the rest of connecting wires. When a fuse gets blown or breaks a new fuse has to be fitted in its place to restore the electricity supply in the household circuit. We should not use a thick wire as a fuse wire because it will have a low resistance and then it will not get heated to its melting point easily.

The magnetic effect of electric current was discovered by:

The magnetic effect of current was discovered by scientist named “Hans Christian Oersted”. When electric current passes through a wire, the current-carrying wire behaves like a magnet. It is this magnetic field produced by the current carrying wire which exerts of force on the compass needle and deflects it.

The compact fluorescent electric lamp has:

The fluorescent tube lights and compact fluorescent lamps do not have filaments. Fluorescent tube lights and compact fluorescent lamps do not work on the heating effect of current. The fluorescent tube light on lamp contains mercury vapor, which is a kind of gas.

A fuse wire is made of:

An electrical fuse is a safety device in the circuit that protects electrical appliances and systems by breaking the connections when a short circuit is occurring. The fuse wire is made up of Sn (tin) and Pb (lead) alloy because of its high resistance and low melting point.

Electric current can produce effects

Generally, electric current can produce three effects which are heating effect, magnetic effect and chemical effect.

Due to this, the filament of electric bulb gets heated to a very high temperature and starts glowing:

The electric bulb has very thin filament of tungsten metal. The filament of an electric bulb has a “high resistance”. When electric current passes through the very thin, high resistance filament of an electric bulb, heat is produced in it. Due to this the filament of electric bulb gets heated to a very high temperature and starts glowing.

In a quiz competition, you are asked a question where you have to choose the statement which is/ are incorrect?

Here all the statements are correct. Hence your answer will be option [D].

Choose the combination of correct answer from the following:

When the switch is in off position, circuit is incomplete. It is said to be open and therefore, no current flows through it.

Tanupriya is writing some statements, choose the incorrect statement and help her:

Here all the statements are correct. Hence your answer will be option [D].

Which of the following statement is or are incorrect?

Here all the statements are correct. Hence your answer will be option [D].

Shreya is writing some statements but she confused to know whether the statements are correct or not? If you know the answer to this question, then tell her:

Here all the statements are correct. Hence your answer will be option [D].

Vishvas is doing his homework which is given by his teacher. Would you help him to choose the incorrect sentences?

The electric bell works on the magnetic effect of current, not the heating effect of current.

Which of the following precautions need not to be taken while using electric gadgets or appliances or circuit?

For using electric gadgets or appliances or circuit, we have to turn the switch in ON position. Therefore, precautions given in option [D], need not to be considered.

Class 7 Science Chapter 14 MCQ

Class 7 Science Chapter 14 MCQ (Multiple Choice Questions) of Electric Current and Its Effect with answers and explanation for current academic session 2021-2022. All the questions are important for exams.

In all subjects MCQs are asked in question papers. All the topics are covered in the form of objective MCQs with answer and explanation. Students are required to study the chapter and go through these objective MCQ tests to be confident in exams.

Class 7 Science Chapter 14 MCQ for 2021-2022

Class: 7	Science
Chapter: 14	Electric Current and Its Effect
Contents:	MCQ Onlne Test with Answers

MCQ Tests with Answers for Class 7 Science Chapter 14

Read the following sentences carefully, and choose the incorrect one:

[A]. Electricity is produced at power stations.

[B]. From the power stations, electricity is brought to our homes through thick wires atop tall electric poles.

[C]. Though electricity is very useful but it can also be very dangerous.

[D]. None of the above

View Answer

Arjun appeared in class test but he confused to know the incorrect statement. Would you help him to know that?

[A]. Improper handling of electricity can cause fires.

[B]. The electricity produced by portable electric generators and inverters is equally dangerous.

[C]. We can use electric cell to obtain electricity that is safe for performing science experiments.

[D]. Portable generators as well as inverters has very low voltage of 110 volts.

View Answer

An electric fuse works on the:

[A]. Chemical effect of current

[B]. Magnetic effect of current

[C]. Lighting effect of current

[D]. Heating effect of current

View Answer

Start to your left side, three bulbs A, B, C are connected in a circuit with the help of wire, switch and three cells. There are no defected pieces of anything. If switch is ON position:

[A]. Bulb C will glow first.

[B]. Bulb B and C will glow simultaneously and bulb A will glow after sometime.

[C]. All the bulbs A, B and C will glow at the same time.

[D]. The bulbs will glow in order A, B and C.

View Answer

An MCB which cuts off the electricity supply in domestic circuit in case of short circuiting and overloading works on the:

[A]. Chemical effect of current

[B]. Heating effect of current

[C]. Magnetic effect of current

[D]. Lighting effect of current

View Answer

Which of the following does not work on the heating effect of current?

[A]. Electric bulb

[B]. Miniature circuit breaker

[C]. Electric fuse

[D]. Immersion rod

View Answer

In a science quiz competition, Ankital are asked a question where she had to choose the statement which was/were incorrect?

[A]. A group of cells joined in series is called a battery.

[B]. When the positive terminal of one cell is joined with the negative terminal of the other cell, then the cells are said to be joined in series.

[C]. A diagram which tells us how the various components in a circuit have been connected by using the electrical symbols of the components, is called a circuit diagram.

[D]. None of the above

View Answer

Which of the following statement is or are correct?

[A]. The touching of live-wire and neutral wire directly is known as short circuit.

[B]. When a short circuit or overloading occurs, the fuse wire blows out cutting off the electricity supply.

[C]. The flow of excessive current and torn wire in the household circuit is the other reason for the short circuit.

[D]. All the above.

View Answer

Recently, in a science class test, you are asked a question where you have to say whether the statements are correct or not?

[A]. An electromagnet is better than a permanent magnet in many respects.

[B]. An electromagnet is a temporary magnet because its magnetism is only for the duration of current flowing in its coil.

[C]. An electromagnet can be made very strong by increasing the number of turns in the coil and by increasing the current passing through the coil.

[D]. All the above

View Answer

Q10

Consider the following statements and choose the incorrect one(s):

[A]. The electromagnet loses its magnetism for a moment and the armature is no longer attracted by it.

[B]. After getting magnetized the electromagnet attracts the iron armature towards itself.

[C]. When we press the switch, the electric circuit of the bell is completed and the current passes through the coil of the electromagnet and it gets magnetized.

[D]. None of the above

View Answer

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Class 7 Science Chapter 14 MCQ

Class 7 Science Chapter 14 MCQ for 2021-2022

MCQ Tests with Answers for Class 7 Science Chapter 14

Read the following sentences carefully, and choose the incorrect one:

Arjun appeared in class test but he confused to know the incorrect statement. Would you help him to know that?

An electric fuse works on the:

Start to your left side, three bulbs A, B, C are connected in a circuit with the help of wire, switch and three cells. There are no defected pieces of anything. If switch is ON position:

An MCB which cuts off the electricity supply in domestic circuit in case of short circuiting and overloading works on the:

Which of the following does not work on the heating effect of current?

In a science quiz competition, Ankital are asked a question where she had to choose the statement which was/were incorrect?

Which of the following statement is or are correct?

Recently, in a science class test, you are asked a question where you have to say whether the statements are correct or not?

Consider the following statements and choose the incorrect one(s):

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