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WorksheetsElectricity
Total questions: 20
Worksheet time: 10mins
Let's think: If the voltage is increased and the resistance stays the same, current will ____.
Increase
Decrease
Stays the same
What is the definition of current?
rate of flow of neutrons
rate of flow of charges
rate of flow of protons
rate of flow of energy
Which subatomic particle is used in the process of electricity?
Electrons
Protons
Neutrons
What is the unit of current?
Volts
Ampere
Ohm
Tesla
What happens to the current in a series circuit if one component is removed?
The current in the entire circuit stops
The current in the entire circuit increases
The current in the entire circuit stays the same
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
10 20
10 16
10 18
10 2
In the circuits (i) , (ii) and (iii) heat produced in the resistor or combination of resistors connected to a 12 V battery will be
same in all the cases
minimum in case (i)
maximum in case (ii)
maximum in case (iii)
Identify the circuit in which the electrical components have been properly connected.
(i)
(ii)
(iii)
(iv)
What is the minimum resistance which can be made using five resistors each of 1/5 Ω?
1/5 Ω
1/25 Ω
1/10 Ω
25 Ω
Unit of electric power may also be expressed as
volt ampere
kilowatt hour
watt second
joule second
Two resistors of resistance 2 Ω and 4 Ω when connected to a battery will have
same current flowing through them when connected in parallel
same current flowing through them when connected in series
same potential difference across them when connected in series
different potential difference across them when connected in parallel
An electric kettle consumes 1 kW of electric power when operated at 220 V. A fuse wire of what rating must be used for it?
1 A
2 A
4 A
5 A
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 2 Ω resistor in 5 s will be
5 J
10 J
20 J
30 J
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?
Brightness of all the bulbs will be the same
Brightness of bulb A will be the maximum
Brightness of bulb B will be more than that of A
Brightness of bulb C will be less than that of B
. If the current I through a resistor is increased by 100% (assume that temperature remains unchanged), the increase in power dissipated will be
100 %
200 %
300 %
400 %
A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1 , R2 and R3 respectively . Which of the following is true?
R1 = R2 = R3
R1 > R2 > R3
R3 > R2 > R1
R2 > R3 > R1
A cylindrical conductor of length l and uniform area of cross section A has resistance R. Another conductor of length 2l and resistance R of the same material has area of cross section
A/2
3A/2
2A
3A
Which of the following represents voltage?
Work done / (Current × Time )
Work done × Charge × Time
Work done × Charge x Time
(Work done × Time ) / Current
The proper representation of series combination of cells (Figure 12.4) obtaining maximum potential is
(i)
(ii)
(iii)
(iv)
What is the least count and Reading shown by the voltmeter in the figure ?
0.15 v and 1.8 v
0.05 v and 1.5 v
1.0 v and 1.8 v
0.15 v and 1.5 v
