WorksheetsElectricity
Total questions: 20
Worksheet time: 10mins
Which of the following is correct?
Rate of change of charge is electrical power
Rate of change of charge is current
Rate of change in energy is current
Rate of change of current is a charge
SI unit of resistance is
mho
joule
ohm
ohmmeter
In a simple circuit, why does the bulb glow when you close the switch?
The switch produces electricity
Closing the switch completes the circuit
Closing the switch breaks the circuit
The bulb is getting charged
Kilowatt-hour is the unit of
resistivity
conductivity
electrical energy
electrical power
Assertion: Electric appliances with a metallic body have three wire connections.
Reason: Three – pin connections reduce heating of the connecting wires
If both the assertion and the reason are true and the reason is the correct explanation of the assertion.
If both the assertion and the reason are true, but the reason is not the correct explanation of the assertion
If the assertion is true, but the reason is false
If the assertion is false, but the reason is true
Assertion: LED bulbs are far better than incandescent bulbs.
Reason: LED bulbs consume less power than incandescent bulbs.
If both the assertion and the reason are true and the reason is the correct explanation of the assertion
If both the assertion and the reason are true, but the reason is not the correct explanation of the assertion
If the assertion is true, but the reason is false
If the assertion is false, but the reason is true
An alloy of nickel and chromium is used as the heating element. Because
it has high resistivity
it has a high melting point
it is not easily oxidized
all the above
Electric charge is expressed in
volt
joule
coulomb
ohm
A charge of 60 coulomb flows through a bulb in 5 minutes what is the current through the bulb?
2 A
0.2 A
12 A
0.12 A
How much heat is generated when current I is passing through a resistor for time t?
I2Rt
IR2t
VI
I2R
Two electric bulbs have resistances in the ratio 1 : 2. If they are joined in series, the energy consumed in these are in the ratio
1:2
2:1
4:1
1:1
To protect the house hold electrical appliances from overloading due to excess current
Fuse wire
MCB
both (a) and (b)
none
One horsepower is equal to
764 watt
746 watt
647 watt
674 watt
Tungsten material is used in
Fuse wire
bulbs
batteries
none
The effective resistance for the given circuit in AB
1 Ω
2 Ω
3 Ω
1.5 Ω
When ‘n’ number of resistors are connected in parallel, the effective resistance for parallel is
n
nR
R/n
none
One kilowatt-hour is
3.6 × 106 J
1000 W
2.7 × 103 J
360 x 102 J
Which instrument is used to measure the current?
Voltmeter
Ammeter
Galvanometer
Rheostat
Insulated wire with red colour coding is
live wire
neutral wire
ground wire
fuse wire
When resistors are connected in series, a current is less as effective resistance is more
True
False
Hypothetical
Unpredictable
