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Worksheetsgrade 10 electricity
Total questions: 50
Worksheet time: 45mins
When electric current is passed, electrons move from:
high potential to low potential.
low potential to high potential.
in the direction of the current.
against the direction of current
The heating element of an electric iron is made up of:
copper
aluminium
nichrome
iron
The electrical resistance of insulators is
high
low
zero
infinity
Electrical resistivity of any given metallic wire depends upon
its thickness
its shape
nature of the material
its length
Electric power is inversely proportional to
resistance
voltage
current
temperature
What is the commercial unit of electrical energy?
Joules
Kilojoules
Kilowatt-hour
watt-hour
Three resistors of 1 Ω, 2 ft and 3 Ω are connected in parallel. The combined resistance of the three resistors should be
greater than 3 Ω
less than 1 Ω
equal to 2 Ω
zero
An electric bulb is connected to a 220V generator. The current is 0.50 A. What is the power of the bulb?
440 V
220 V
110 V
55 V
100 J of heat is produced each second in a 4Ω resistor. The potential difference across the resistor will be:
30 V
10 V
20 V
25 V
Coulomb is the SI unit of:
charge
current
resistance
potential difference
Materials which allow larger currents to flow through them are called
insulators
conductors
semiconductors
alloys
Conventionally, the direction of the current is taken as
the direction of flow of negative charge
the direction of flow of atoms
the direction of flow of molecules
the direction of flow of positive charge
The slope of voltage (V) versus current (I) is called
resistance
conductance
resistivity
conductivity
An electric iron draws a current 4 A when connected to a 220 V mains. Its resistance must be
1000 Ω
55 Ω
44 Ω
none of these
Calculate the current flows through the 10 Ω resistor in the following circuit.
1.2 A
0.6 A
0.2 A
2.0 A
RESISTANCE OF A CONDUCTOR DEPENDS UPON:
LENGTH
AREA
TEMPRATURE
ALL ABOVE
RESISTANCE OF A CONDUCTOR DEPENDS ON:
LENGTH
AREA
TEMPRATURE
NATURE OF MATERIAL
WHICH OF THIS IS GOOD CONDUCTOR OF ELECTRICITY?
AMMETER
VOLTMETER
BOTH A AND B
NON OF THESE
1 horsepower is equal to
700 WATT
100 WATT
746 WATT
627 WATT
According to ohms law,
The resistance increases with the increases in current.
The resistance increases with the increases in voltage.
The resistance and current both increases wiTh the increases in voltage.
The current increases with the increases in voltage.
what is the resistance of a lamp whose current is 6 A and the voltage across it is 120 V?
120 0hm
20 ohm
16 ohm
10 ohm
What is the correct symbol for a light bulb?
Electrical potential is ------------
scalar quantity
vector quantity
both scalar and vector
neither scalar nor vector
kilowatt hour is unit of
energy
power
momentum
force
SI unit of resistivity (specific resistance) is ----------
ohm
ohm meter
volt
ampere
An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, power consumed will be ---------------. [Use P = (V X V)/R]
100 W
75 W
50 W
25 W
Ammeter is used to measure ----------------.
voltage
electric current
resistance
resistivity
Ohm's law is applicable only when ----------------
temperature remains constant
temperature increases
temperature decreases
none
Keeping the potential difference constant, the resistance of the circuit is halved, the current will become --------------
four times
half
double
one-third
Electrical resistivity of a given metallic wire depends upon ----------
its length
its thickness
its shape
nature of the material
What is the SI unit of electric charge?
ampere
volt
ohm
coulomb
What is the maximum resistance which can be made using five resistor each of 1/5 ohm?
1/5 ohm
10 ohm
5 ohm
1 ohm
When a 4 ohm resistor is connected across the terminals of a 2 V battery, the number of coulombs passing through the resistor per second is --------------
0.5
1
2
4
If the current flowing through a fixed resistor is halved, the heat produced in it will become -----------------
one-fourth
one-half
double
four times
An electric iron of resistance 20 ohm takes a current of 5 A. Calculate the heat developed in 30 s. [Use H = I X I X R X t]
1000 joules
2000 joules
15000 joules
30000 joules
An electric iron has a rating of 750 W, 220 V. Calculate current passing through it. [Use P = IV]
5 A
6 A
3.4 A
7 A
If the current in an electrical circuit is constant, what will happen to the voltage if the resistance is increased?
Voltage will increase
Voltage will decrease
Voltage will stay the same
An electric kettle is commonly used to heat up water at home. The heating element used is nichrome wire and not copper. Which of the following reasons best explains why nichrome is used instead of copper?
Nichrome conducts more current than copper, so more heat can be generated.
Nichrome has higher resistance than copper, so more heat can be generated.
Nichrome has higher voltage than copper, so more heat can be generated.
Nichrome are cheaper than copper, so it is more economical.
A torch has a battery and a bulb. The current in its circuit is 0.08 A. Calculate the amount of charge passing a point in this circuit in 2 minutes.
9.9 C
9.3 C
9.6 C
0.16 C
The heating elements in the clothes dryer is rated at 5 kW and 220 V. How much current does it draw?
A. I= 0.02 A
B. I= 22.7 A
C. I= 27.2 A
D. I= 27.2 A
Which is the correct mathematical form of Ohm"s law
I = V R
R = I V
V = I / R
V = I R
Keeping potential difference constant if resistance is doubled then electric current is
Doubled
Halved
Reduced to zero
Tripled
