Worksheets10_Electricity
Total questions: 25
Worksheet time: 31mins
Name
Class
Date
1.
Unit Of Electric Power May Also Be Expressed As
a)
Volt ampere
b)
Kilowatt hour
c)
Watt second
d)
Joule second
2.
Two Resistors Of Resistance 2Ω And 4Ω When Connected To A Battery Will Have
a)
Same current flowing through them when connected in parallel
b)
Same current flowing through them when connected in series
c)
Same potential difference across them when connected in series
d)
Different potential difference across them when connected in Parallel
3.
Pick the INCORRECT statement:
a)
Those substances through which electricity can flow are called conductors.
b)
Those substances through which electricity cannot flow are called insulators.
c)
The presence of free electrons in a substance make it a conductor of electricity.
d)
In static electricity the electric charges flows to one end to another end.
4.
In An Electrical Circuit Two Resistors Of 2 Ω And 4 Ω Respectively Are Connected In Series To A 6 V Battery. The Heat Dissipated By The 4 Ω Resistor In 5 S Will Be
a)
5 J
b)
10 J
c)
20 J
d)
30 J
5.
Deepak Appeared In Class Test But He Confused To Know The Correct Statement. Would You Help Him To Know That?
a)
The potential difference is measured by means of an instrument called voltmeter.
b)
The potential difference between two points is said to be one volt if one joule of work is done in moving one coulomb of electric charge from one point to the other.
c)
The SI unit of potential difference is volt.
d)
All the above.
6.
In An Electrical Circuit Three Incandescent Bulbs A, B And C Of Rating 40 W, 60 W And 100 W Respectively Are Connected In Parallel To An Electric Source. Which Of The Following Is Likely To Happen Regarding Their Brightness?
a)
Brightness of all the bulbs will be the same
b)
Brightness of bulb A will be the maximum
c)
Brightness of bulb B will be more than that of A
d)
Brightness of bulb C will be less than that of B
7.
Choose the INCORRECT statement:
a)
A single dry cell has a potential difference of 1.5 volts between its two terminals.
b)
The actual flow of electrons which constitutes the current from negative terminal to positive terminal of a cell.
c)
The conventional direction of electric current is from positive terminal of a cell or a battery to the negative terminal, through the outer circuit.
d)
None of these.
8.
If The Current I Through A Resistor Is Increased By 100% (Assume That Temperature Remains Unchanged), The Increase In Power Dissipated Will Be
a)
100 %
b)
200 %
c)
300 %
d)
400 %
9.
Which Of The Following Statement Is/Or Are Correct?
a)
Circuit is a continuous conducting path consisting of wires and switch between two terminals of a cell along which an electric current flow.
b)
The electric current is a flow of electrons in a metal wire or conductor when a battery is applied across its ends.
c)
The simplest way to maintain a potential difference between the two ends of a conductor is to connect the conductor between the terminals of a cell or battery.
d)
All these.
10.
Pick the INCORRECT statement:
a)
If the potential difference across the ends of a conductor is doubled, the current flowing through it also gets halved.
b)
A resistance is the ratio of potential difference applied between the ends of a conductor and the current flowing through it is constant quantity.
c)
At constant temperature, the current flowing through a conductor is directly proportional to the potential difference across its ends.
d)
If the resistance is doubled, the current gets halved.
11.
In A Science Quiz Competition, Neha Are Asked A Question Where She Had To Choose The Statement Which Was/Were Correct?
a)
The property of a conductor due to which it opposes the flow of current through it is called resistance.
b)
The resistance of a conductor depends on length, thickness, nature of material and temperature of the conductor.
c)
1 ohm is the resistance of a conductor such that when a potential difference of 1 volt is applied to its ends, a current of 1 ampere flows through it.
d)
All these.
12.
What Is The Minimum Resistance Which Can Be Made Using Five Resistors Each Of 1/5 Ω?
a)
1/5 Ω
b)
1/25 Ω
c)
1/10 Ω
d)
25 Ω
13.
Priya Is Writing Some Statements, Choose The Incorrect Statement And Help Him:
a)
Those substance which have very low electrical resistance are called good conductors.
b)
Those substances which have comparatively high electrical resistance, are called resistors.
c)
Those substances which have infinitely high electrical resistance are called insulators.
d)
The heating element of electric iron is made of nichrome wire which is an insulator.
14.
A Current Of 1 A Is Drawn By A Filament Of An Electric Bulb. Number Of Electrons Passing Through A Cross Section Of The Filament In 16 Seconds Would Be Roughly
a)
10 to the power 20
b)
10 to the power16
c)
10 to the power18
d)
10 to the power23
15.
Consider The Following Statements And Choose The Incorrect One:
a)
The resistance of all pure metals increases on raising the temperature; and decreasing on lowering the temperature.
b)
A thick wire has more resistance; and a thin wire has less resistance.
c)
Short length of a thick wire is used for getting low resistance; and long length of a thin wire is used for getting high resistance.
d)
The resistance of a wire is inversely proportional to the square of its diameter.
16.
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
17.
Consider The Following Statements And Choose The Correct One:
a)
The combined resistance of any number of resistance connected in series is equal to the sum of the individual resistances.
b)
When two or more resistances are connected between the same two points, they are said to be connected in parallel.
c)
When two or more resistances are connected end to end consecutively, they are said to be connected in series.
d)
All the above.
18.
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
19.
Which Of The Following Is The Most Likely Temperature Of The Filament Of An Electric Light Bulb When It Is Working On The Normal 220 V Supply Line?
a)
500°C
b)
1500°C
c)
2500°C
d)
4500°C
20.
The Commercial Unit Of Energy Is:
a)
Watt
b)
Watt-hour
c)
Kilowatt-hour
d)
Kilo-joule
21.
Tanu 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)
1 watt hour is the amount of electrical energy consumed when an electrical appliance of 1 watt power is used for 1 hour
b)
One kilowatt hour is the amount of electrical energy consumed when an electrical appliances having a power rating of 1 kilowatt is used for 1 hour
c)
1 kilowatt hour is equal to 3.6 X 10 to the power 16, joules of electrical energy.
d)
None of the above.
22.
An Electric Kettle For Use On A 230 V Supply Is Rated 3000 W. For Safe Working, The Cable Connected To It Should Be Able To Carry At Least:
a)
2 A
b)
5 A
c)
10 A
d)
15 A
23.
The Resistance Of A Wire Of Length 300 M And Cross-Section Area 1.0 Mm2 Made Of Material Of Resistivity 1.0 × 10−7 Ωm Is:
a)
2 Ω
b)
3 Ω
c)
20 Ω
d)
30 Ω
24.
Ohm’s Law Gives A Relationship Between:
a)
Current and resistance
b)
Resistance and potential difference
c)
Potential difference and electric charge
d)
Current and potential difference
25.
One Coulomb Charge Is Equivalent To The Charge Contained In:
a)
2.6 × 10 to the power 19 electrons
b)
6.2 × 10 to the power 19 electrons
c)
2.65 × 10 to the power 18 electrons
d)
6.25 × 10 to the power 18 electrons
100 %
