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

MCQ Tests with Answers for Class 7 Science Chapter 14




Q1

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

[A]. Reduce substantially
[B]. Does not change
[C]. Increase heavily
[D]. Varies continuously
Q2

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

[A]. Copper
[B]. Aluminium
[C]. Nichrome
[D]. Tungsten
Q3

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.
Q4

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

[A]. Sound and heat
[B]. Heat and magnetism
[C]. Heat and light
[D]. Light
Q5

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

[A]. Electric current is actually a flow of charged particles called electrons in a conductor.
[B]. A cell or battery is a source of electric current but this current not flow out on its own.
[C]. A continuous conducting path between the two terminals of a cell of battery along which an electric current flow, is called a circuit.
[D]. None of the above




Q6

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

[A]. Iron
[B]. Brass
[C]. Aluminium
[D]. Steel
Q7

Which of the following statement is or are incorrect?

[A]. When the switch in the circuit is open, then the switch is said to be in the off-position.
[B]. Sometimes the bulb does not light up or glow even when the switch is in the on position or closed.
[C]. The positive terminal of one cell is joined to the negative terminal of the other cell.
[D]. The symbol for representing a battery for three cells will have four pairs of long and short parallel lines connected to one another.
Q8

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

[A]. CBD
[B]. DCB
[C]. MCD
[D]. MCB
Q9

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.
Q10

Nichrome wire is used in:

[A]. CFL
[B]. Electric fuse
[C]. Hair dryer
[D]. MCB



Q11

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

[A]. Magnetism
[B]. Sound
[C]. Light
[D]. Heat
Q12

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

[A]. Thin and short
[B]. Thick and short
[C]. Low melting point
[D]. Higher resistance than rest of wiring
Q13

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
Q14

The magnetic effect of electric current was discovered by:

[A]. Maxwell
[B]. Darwin
[C]. Oersted
[D]. Newton
Q15

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



Q16

A fuse wire is made of:

[A]. Cu and Pb
[B]. Pb and Sn
[C]. Al and Sn
[D]. Pb and Al
Q17

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
Q18

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

[A]. Light
[B]. Magnetic field
[C]. Resistance
[D]. Nichrome wire
Q19

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

[A]. A fuse works on the heating effect of current.
[B]. A fuse consists of a short length of a thin, tin-plated copper wire having low melting point.
[C]. A fuse is a safety device which prevents electric fires and damage to electrical appliances due to excessive flow of current.
[D]. None of the above
Q20

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.




Q21

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

[A]. MCB stand for miniature circuit breaker.
[B]. MCB works on the magnetic effect of current.
[C]. MCB does not work on the heating effect of current.
[D]. None of the above
Q22

Which of the following statement is or are incorrect?

[A]. The magnetic effect of current was discovered by scientist named Hans Christian Oersted.
[B]. When electric current passes through a wire, the current-carrying wire behaves like a magnet.
[C]. It is this magnetic field produced by the current carrying wire which exerts of force on the compass needle and deflects it.
[D]. None of the above
Q23

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:

[A]. Electromagnets are used in the construction of a large number of devices like electric bells, loudspeakers, electric motors etc.
[B]. The electromagnets which are used for loading and unloading heavy iron and steel objects are fitted on cranes.
[C]. Electromagnets are used by doctors to remove tiny iron particles from the eyes of a person (which may have fallen into the eyes accidentally).
[D]. All the above
Q24

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
Q25

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

[A]. We should never touch a lighted electric bulb connected to the mains.
[B]. We should never do experiment with the electric Supply from the mains or a generator or an inverter.
[C]. We should never use just any wire or strip of metal in place of a fuse.
[D]. We should never turn the switch in ON position.

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