Basic Electrical MCQ Questions & Answers |Effects of Electric Current MCQs

Here given Basic Electrical MCQ Questions & Answers on the topic “ Effects of Electric current“

Effects of Electric Current MCQs

An electric component used as a safety device in electric circuits is
(a) switch (b) fuse
(c) cell (d) electric wires

Ans: b) Fuse is used as a safety device in electric circuits.

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The electric bell makes use of
(a) a U-shaped electromagnet
(b) a bar-shaped electromagnet
(c) a ring-shaped electromagnet
(d) no electromagnet.

Ans: (a) A U-shaped electromagnet is used in an electric bell. It is magnetised when the push button of the bell is pressed.

In an electric circuit, the current starts from
(a) the negative terminal of the battery
(b) the positive terminal of the battery
(c) either of the terminals of the battery
(d) none of the terminals of the battery.

Ans: (b): The current starts from the positive terminal of the cell or battery and ends in negative terminal.

The strength of an electromagnet does not depend upon
(a) the current flowing through the coil
(b) the number of turns of the coil
(c) the insulating material of the coil
(d) the length of the electromagnet.

Ans: (c) : The strength of electromagnet depends upon the amount of current flowing through the coil, number of turns in the coil, length of the electromagnet and the magnetic material used.

Read : Magnetic materials: Dia, Para,Ferro,Ferri and Antiferro magnetic materials

The bulb in an electric circuit glows because of
(a) magnetic effect of current
(b) heating effect of current
(c) chemical effect of current
(d) none of these

Ans: (b): When a bulb is connected in a circuit and switched on, its filament becomes so hot that it gives out light.

Which of the following is not a source of electric
current?
(a) Car battery (b) Dry cell
(c) Cell (d) Electromagnet

Ans: (d): An electromagnet is a temporary magnet. It is not a source of electric current.

A battery is a group of
(a) only two cells (b) two or more cells
(c) only single cell (d) all of these

Ans: (b): Two or more cells are combined together to provide more electric current, known as battery.

Read: Grouping of Cells|Series, parallel and Mixed Cell combinations

Key or switch in circuit is placed
(a) left side of the battery
(b) right side of the battery
(c) anywhere in the circuit
(d) near the positive terminal of the bulb

Ans: (c) : A switch is a device which helps in breaking or completing a circuit so it can be placed anywhere in the circuit.

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The coil of wire contained in heater is known as
(a) component (b) circuit
(c) element (d) spring

Ans: (c)

Which mark is necessary on electric appliances?
(a) ISI (b) FICC
(c) AGMARK (d) KSK

Ans: (a)

In the symbol of an electric cell, the longer line represents the terminal, and the thicker and shorter line represents the
___ terminal.
(a) negative, positve (b) neutral, positive
(c) neutral, negative (d) positive, negative

Ans: (d)

The device used to prevent the flow of excess
current in the circuit is
(a) switch (b) fuse
(c) bulb (d) coil.

Ans: (b): Fuse blows off a little before any other part of the circuit could, so the flow of excess current stops and further heating of the circuit is prevented.

A current carrying coil of an insulated wire wrapped around a piece of soft iron becomes
(a) a filament (b) an electromagnet
(c) a fuse (d) a conductor.

Ans: (b): An electromagnet utilizes the magnetic effect of current. It acts as a magnet as long as the current is flowing in the wire.

The thin wire inside a bulb is
(a) coil (b) magnet
(c) filament (d) none of these

Ans: (c)

Which of the following is/are true about CFLs?
(a) Reduce power wastage
(b) Fix in ordinary bulb holders
(c) Both (a) and (b)
(d) Neither (a) nor (b).

Which of the following is not a circuit element?
(a) Potential difference (b) Voltmeter
(c) Resistor (d) Battery

Ans: (a) : Potential difference is a physical quantity.

The necessary requirement for a fuse wire is
(a) conductor with low melting point
(b) conductor with high melting point
(c) insulator with low melting point
(d) insulator with high melting point

Ans: (a) : Fuse is made up of tin or alloy of tin and copper. It is a thin conducting wire with low melting point.

Mark out the correct statement.
(a) Fuses and MCBs are safety device.
(b) Fuses are safety device but MCBs are not
(c) MCBs are safety device but fuses are not.
(d) Neither fuses nor MCBs are safety device.

Ans: (a)

Which of these appliances does not use an electromagnet?
(a) Washing machine (b) Refrigerator
(c) Room heater (d) Electric bell

Ans: (c)

The shorter, thicker vertical line in the symbol of a cell represents
(a) the positive terminal
(b) the negative terminal
(c) the direction of current
(d) none of these

Ans: (b)

Read : Primary and secondary cells|Cells and Batteries

The longer, thinner line in the symbol of a cell
denotes
(a) the positive terminal
(b) the negative terminal
(c) the direction of current
(d) none of these

Ans: (b)

Read : Cells and batteries|

Which of the following is the symbol for a bulb?

Ans: (d)

Which of the following is an electrical conductor?
(a) Silver (b) Cork
(c) Silver-coloured plastic
(d) Wood

Ans: (a) : Silver is a metal and a good conductor of electricity.

In which circuit will the bulb or bulbs glow the the brightest?
(a) A simple circuit with one bulb and one cell.
(b) A simple circuit with one bulb and two cells
(c) A simple circuit with two bulbs and one cell
(d) A simple circuit with two bulbs and two cells

Ans: (b): 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.

Why is electrical wiring usually covered with
a layer of plastic?
(a) To make it strong
(b) To help electricity flow in it
(c) To make it safe
(d) To make it beautiful

Ans: (c) : Plastic is a good insulator of electricity and makes it possible to work with wires without any harm/injury.

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

(a) Replace one of the cells with a cork
(b) Replace one of the cells with a wire
(c) Replace one of the bulbs with a cork
(d) Replace one of the bulbs with a wire

Ans: (b): 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.

Pooja makes a simple circuit with one bulb and five cells. The bulb lights for an instant and then goes out. It happened because
(a) electricity could not flow through the circuit
(b) too much electricity passed through the bulb filament
(c) the wires melted in the heat
(d) all of these

Ans: (b): Because of too many cells, the electricity that was flowing through the filament of the bulb was more, causing it to melt and break contact.

Why is electrical wiring usually made from copper and not silver?
(a) Copper is a better conductor
(b) Copper is a better insulator
(c) Copper is less expensive
(d) Copper is non magnetic

Ans: (c) : Silver is better conductor, non magnetic but expensive material.

Study the circuit shown here. Which switch if opened will cause the light bulb to stop glowing?

(a) P (b) Q
(c) R (d) S

Ans: (a) : The other switches would not be able to break the circuit.

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

(a) 1 (b)
(c) 3 (d) 4

Ans: (c) : Two similar terminals, if connected together does not allow electric current to flow.

An electric heater is used by us to convert electrical energy to
(a) heat energy (b) light energy
(c) chemical energy (d) both a and b

Ans: (a) : A heater is used to obtain heat energy. For light energy, a bulb or other sources are used

If you place a compass near a current carryingwire, it will
(a) get deflected (b) get charged
(c) get hot (d) glow brightly

Ans: (a) : A current carrying wire behaves like a magnet and affects other magnets in its magnetic field.

When the two terminals of a cell are connected directly with a wire, then
(a) more electrical energy is stored in the cell
(b) the chemicals get used up very fast
(c) no current flows
(d) the cell explodes

Ans:(b)

Which of the following statements regarding an electromagnet is NOT true?
(a) Insulated wire is wound around it.
(b) It works only in the presence of electricity.
(c) It is used in fans and radio.
(d) It is a permanent magnet.

Ans:(d): It is a temporary magnet, which works only in the presence of electricity.

Electricians wear rubber gloves because it is
(a) soft (b) water proof
(c) an insulator (d) inexpensive

Ans:(c) : Rubber gloves, being an insulator, protects them from electric shock.

Which of the following does not belong to the group formed by the others?
(a) Copper coin (b) Steel spoon
(c) Wooden ruler (d) Iron nail

Ans:(c) : Wooden ruler is an electrical insulator.

Iron is used for making electromagnet; not steel,
nickel, cobalt because
(a) iron is cheap and easily available
(b) iron is a good conductor of electricity
(c) when current is switched off in the coil of an electromagnet made of iron, iron loses all its magnetism
(d) none of these

Ans: (c) : Iron is called a soft magnetic material because it loses its magnetism easily.

Which one of the following phenomenon occurs when two naked wires of electricity supply line touch each other?

Ans: (b): When two naked wires of electricity supply line touch each other, a large amount of current flows through the wires. This phenomenon is known as shortcircuiting.

Which one of the following is the best conductor of electricity?
(a) Silver (b) Copper
(c) Aluminium (d) Iron

Ans:(a) Silver

Magnetic effect of current was discovered by
(a) Thomas Jefferson
(b) Hans Christian Oersted
(c) Flemming
(d) Louis Pasteur

Ans:(b)

What is overloading?
(a) Touching of live wire with the neutral wire.
(b) Touching of live wire with the earth wire.
(c) Touching of neutral wire with the earth wire.
(d) Putting more current across a wire than it can handle.

Ans:(d)

The electric fuse work on which one of the following phenomenon?
(a) Chemical effect of current
(b) Magnetic effect of current
(c) Heating effect of current
(d) None of these

Ans:(c)

On which of the following is the resistance of wire depends?
(a) Length of the wire
(b) Thickness of the wire
(c) Material of the wire
(d) All of these

Ans:(d): Resistance offered by a conductor depends on its length, thickness and the material of which it is made.

In which of the following conditions,amount of heat produced in a current carrying wire, will increase?
(a) When amount of current passing in the wire is increased
(b) When amount of current passing in the wire is decreased
(c) When terminals of the wire are changed
(d) None of these

Ans: (a) : The larger the current, the more is the heat produced in the wire. And how large the current is depends on the voltage of the source and the resistance of the conductor.

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