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CBSE Questions for Class 6 Physics Electricity And Circuits Quiz 2 - MCQExams.com
CBSE
Class 6 Physics
Electricity And Circuits
Quiz 2
State whether given statement is True or False
Glass is a good insulator.
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True
0%
False
Explanation
Glass is actually an insulator. It doesn'
t
allow the flow of electrons easily from atom to atom, as seen in substances like
copper
, and other
metals
which are excellent
conductors
of both heat and electricity. Insulators have electrons that are held tightly which means they aren'
t
shared between other atoms.
A material that lets electricity to pass through it is called a/an-
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Electrical appliances
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Electrical conductor
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Electrical insulator
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None of these
Explanation
An
electrical conductor
is a substance in which
electrical
charge carriers, usually electrons, move easily from atom to atom with the application of voltage.
Conductivity
, in general, is the capacity to transmit something, such as
electricity
or heat. ... Copper, steel, gold, aluminum, and brass are good electric conductor.
The main function of a switch is to
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Allow charges of flow
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Complete or break a circuit
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Make the bulb glow easily
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Prevent electric shocks
Explanation
A switch is a device that is used for making and breaking electric current in a circuit. It is used to turn on and turn off daily used equipment like television, washing machine, fan, light, etc.
A substance that allows electricity to pass through it, is called ______
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electrical conductor
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electrical insulator
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electrical semiconductor
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None of these
Explanation
Electrical conductors have free electrons in there outermost shell giving them the property of movement of electrons within the conductor structure and that movement of electrons is also called as current Hence, Electrical conductors provides easy passage to the electrons. Hence A option is correct
Which of the following does not belong to the group formed by the others?
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Iron coin
0%
Wooden ruler
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Silver cup
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Copper wire
Explanation
Except wood all are good conductors whereas wood is an insulator.
Good conductors are those materials that allow electricity to pass through them easily. Bad conductors are those materials that do not allow electricity to pass through them easily.
State whether given statement is True or False.
Silver is a good conductor of electricity.
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True
0%
False
Explanation
Silver, being a metal, is a good conductor of electricity. It is because the particles of silver provide a smooth path for electricity to pass through it with minimum difficulty.
What will happen when an electric circuit is open ?
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Current will flow in each and every part of circuit
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Current will not flow in any part of circuit
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Current will flow in half part of the circuit
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Current will be maximum in the circuit
Explanation
Electric current is a flow of electric charge.But current only flows in closed paths. No current can flow if the circuit is broken, for example, when a switch is open in the circuit ,current will not flow in any part of circuit as circuit is open and there is no closed path available for charge to flow.
Find the odd man out.
Copper, Aluminium, Iron, Wood, Brass.
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Wood
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Aluminium
0%
Iron
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Brass
Explanation
Wood is a bad conductor of electricity. Rest are good conductors of
electricity.
Find odd one out:
Copper, Salt water, Cotton, Human body.
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Human body
0%
Cotton
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Salt water
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Copper
Explanation
Cotton is an insulator, rest are good conductors.
Device which helps in maintaining a potential difference across a conductor is
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A cell
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A battery
0%
Both
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None
Explanation
A cell and a battery helps in maintaining a potential difference across a conductor.
Define electrical circuit.
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Electrical circuit is a path of electrical components through which the electric current flows.
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Electrical circuit is a closed path of electrical components through which the electric current flows.
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Electrical circuit is a combination of components which generate electromotive force.
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Electrical circuit is a system which stores electrical energy.
Explanation
Electrical circuit is a closed path of wires and electrical components which allows a current through it on the application of potential difference between two points in the path.
________are substances which do not allow electricity to pass through them.
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Insulators
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Conductors
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Semi-conductors
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None of these
Explanation
The substance which do not allow electricity to pass through them are called $$insulators$$.
Answer-(A)
Find odd man out
Plastic, Rubber, Glass, Silver
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Glass
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Rubber
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Silver
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Plastic
Explanation
All are bad conductors (insulator) of electricity, but silver is a good conductor.
Why is electrical wiring usually made from copper?
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Because copper is not magnetic
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none of these
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Because copper is shiny.
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Because copper conducts electricity.
Explanation
Materials that allow an electric current to pass through them are called
conductors. Copper is a good conductor of electricity. The electrical wiring usually made from copper b
ecause copper conducts electricity.
Substances which allow electricity to pass through them are known as
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Electrical conductors
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Electrical insulators
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Both conductors & insulators
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None of these
Explanation
Substances which allow electricity to pass through them easily are called conductors of electricity or electrical conductors.For example:Silver,Copper,Aluminium,etc.
Nidhi has two bulbs connected across two cells in a simple circuit. How can she make the bulbs glow dim?
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Replace one cell with a piece of chalk
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Replace one cell wtih a piece of wire
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Replace one bulb with a piece of wire
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Replace one bulb with another cell
What happens to a circuit when the switch is off?
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The circuit is complete
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There is a gap in the circuit
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Electricity flows continuously
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Electricity flows discontinuously
Explanation
The switch acts as a connecting part of a circuit. When the switch is off, the circuit is incomplete as the connection is broken in the place of the switch. So, no current can pass through this broken circuit.
The metal disc provided at; one end of the common cell is the:
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switch
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positive terminal
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negative terminal
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spring
Explanation
The metallic disc at lower end of common cell is at lower potential than the upper cap of cell and is termed as negative terminal .
Answer-(C)
Substances that do not allow free flow of charge through them are called __________.
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Insulators
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Conductors
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Both A and B
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None of these
Explanation
Substances that do not allow free flow of charge (i.e. electron) through them are called insulator.
For example:- Plastic, wood
A bulb rated 240 V, 100 W is connected to a 120V supply. What can be inferred?
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The bulb fuses
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The bulb lights up but it is dim
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The bulb lights up to normal brightness
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The bulb lights up initially and then it fuses
Explanation
Rating of bulb
$$P=100W$$
$$V=240V$$
$$P=\dfrac{V^2}{R}$$
$$R=\dfrac{V^2}{P}$$
$$R=\dfrac{240^2}{100}$$=$$576\Omega$$
Also
$$P=VI$$
$$100=240\times I$$
$$I$$=$$0.416A$$
So the bulb has a resistance of $$576\Omega$$ and can tolerate a current of $$0.416A$$
Now supply=$$120V$$
$$V=IR$$
$$120=I\times 576$$
$$I=0.208A$$.....which is less than rated current $$0.416A$$ hence the bulb will not fuse.
It will light up but dim because $$120V$$is supplied instead of rated $$240V$$
The given figure is a 'material tester'.
Which of the following objects will make the bulb glow when put on the gap shown?
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0%
0%
0%
Explanation
The nail will make the bulb glow.
Because it is made up of metal, and we know that metals are good conductors of electricity. Other options are not good conductors of electricity.
So, only the nail will allow electricity to pass through it.
What type of energy transformation occurs in a dry cell ?
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electrical to thermal energy
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chemical to electrical energy
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electrical to light energy
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potential to electrical energy.
Explanation
In a zinc-carbon dry cell there is
a electro-chemical reaction
between zinc and
manganese dioxide
. A
carbon
rod collects the current from the manganese dioxide electrode. Thus chemical energy is converted into electrical energy. Option B is correct.
If an electric current is passed through a cut potato for some time, then there would be a colored spot on the potato around one wire and no such spot around the other wire.
State the colour of the spot.
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Greenish blue
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Black
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Brownish yellow
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Reddish purple
Explanation
The potato turns greenish blue when connected to the positive terminal, the electrons from the negative terminal of the battery move inside the potato as the electrolysis occurs at the copper wire inside potato. This electrolysis conducted by the presence of starch in potato which produces more electrons.
Which one of the following will not conduct electricity?
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solid NaCl
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$$CuSO_4$$ solution
0%
graphite
0%
acidified water
Explanation
A substance can only conduct electricity if it contains charged particles (electrons or ions) that are free to move around. In solid sodium chloride, there are ions but these ions are locked into the ionic lattice and are unable to move.
NaCl (common salt) is solid in state and solid ions or compounds don't conduct electricity
. It needs to be either melted, molten or dissolved in a solution (i.e. water) first. Only then will the electrons be free to move to either the Cathode (-ve) or to the Anode (+ve). In a liquid state the electrons are free enough to move.
In which circuit will the bulb or
bulbs glow the brightest?
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A simple circuit with one bulb and one cell
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A simple circuit with one bulb and two cells
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A simple circuit with two bulbs and one cell
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A simple circuit with two bulbs and two cells
Explanation
(A) Option :-
A simple circuit with one cell and one bulb
power $$=\dfrac { { V }^{ 2 } }{ R } =\dfrac { { V }^{ 2 } }{ R } $$
(B) Option: A simple circuit with two cell a one bulb
power $$=\dfrac { (2V)^{ 2 } }{ R } =\dfrac { 4{ V }^{ 2 } }{ R } $$
(C) Option: A simple circuit two bulbs and two cells
power $$=\dfrac { (2V)^{ 2 } }{ R } =\dfrac { 2{ V }^{ 2 } }{ R } $$
(D) Option : A simple circuit with two bulbs and one cell
power $$=\dfrac { { V }^{ 2 } }{ 2R } $$
We see that in (B) option P is highest bulb will glow in (B) option.
Electric energy is produced from the ............ stored inside the cell.
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0%
Chemicals
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Insulator
0%
Transistor
0%
None of these.
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Answer required
Some matters do not allow the electricity to pass through it. What is called a matter which does not allow the electricity to pass though it?
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Conductor
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Insulator
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Semiconductor
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All of these
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None of these
Explanation
Substances which do not allow electricity to pass through them are called insulators.Examples: Mica,Plastic.
This symbol is -
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Switch in 'OFF' position
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Electric bell
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Switch in 'ON' position
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Electric bulb
Explanation
The given symbol is the symbol of a switch in the 'ON' position. The switch is closed as both of its terminals are connected and provide a closed path for the current to flow through it.
Answer-(C)
What is symbol of switch in 'OFF' position?
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0%
0%
0%
Explanation
Second option is the symbol of switch in 'OFF' position. It shows the switch is OPEN.
Answer-(B)
What happens to a circuit when the switch is off?
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The circuit is complete
0%
The circuit is now an open circiut
0%
Electricity flows continuously
0%
Electricity flows discontinuously
Explanation
When the circuit switch is off, no electricity will flow and then the circuit is called an open circuit. Electricity will not flow in open circuit.
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