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Current Electricity
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Let's practice 30 mcqs on
Current Electricity
mcqs by everyone
A voltmeter reading up to 1000 m V is calibrated with apotentiometer.
An
e. m. f. of 1.08 V is balanced across 5.4 m of thewire.
The balanceing length is 4.55 m when the voltmeter reads 0.9
V. The error in the voltmeter reading is
- 0.06 V
Zero
- 0.01 V
- 0.04 V
(Electrical energy/time) is equal to
potential difference
flow of heat
electric power
flow of light
On applying external magnetic field, free electrons move
against magnetic field
Randomly
in a specific direction
does not move
Resistance of wire is directly proportional to the
wire material's nature
cross sectional area of the wire
length of the wire
All of the above
A battery of
e. m. f. E and internal resistance r is being charged with current
i. The terminal potential will be
E + ir
E
id - E
E - ir
Amount of heat generated in a resistance due to flow of charges is equal to product of square of current, resistance and timeduration.
This statement is known as
Ohm's law
Pascal's law
Newton's law
Joule's law
Resistance of wire is inversely proportional to the
cross sectional area of the wire
All of the above
wire material's nature
length of the wire
Wires carrying electricity are covered with good insulator, called
Rope
fuse
Circuit
cable
If 1 A of current passes through a bulb that consumes 1 J of energy then potential difference is
4 volts
3 volts
2 volts
1 volt
Mixed groups of cells will send the maximum current in the external circuit when total internal resistance is
less than external resistance
more than external resistance
equal to external resistance
Zero
SI unit for resistance is
volt
farad
ohm
Ampere
A 50 W television and 3 kW oven are connected to a 300 Vsupply.
current flows in each of appliance is respectively
0.4 A, 20 A
2.3 A, 25 A
0.16 A, 50 A
14 A, 29 A
Specific resistance of iron is
1.69 × 10-8
2.75 × 10-8
9.8 × 10-8
5.25 × 10-8
A cell of
e. m. f. E is connected across resistance R. The potential difference between the terminals of a cell is found to be
V. The internal resistance of the cell must be
(E - V) R
(E - V) / R
2(E - V) / R
2 (E - V) / R V
Thecolour of terminal of galvanometer that shows negative polarity is
Black
Green
Blue
Red
Current that changes direction after equal intervals of time is called
direct current
electric charge
conventional current
alternating current
Positive and negative terminals of direct current have
no polarity
always negative polarity
fixed polarity
variable polarity
A resistor having resistance 6.2Ω is connected across a battery of 5 V by means of a wire of negotiableresistance.
Current passes through resistor is 0.4
A. total power produced by battery is
5 W
2 W
3 W
6 W
A pipe with larger cross sectional area than other offers
variable resistance
small resistance
large resistance
equal resistance
To convert a galvanometer into an ammeter, we should connect
a high resistance in series with it
a high resistance in parallel with it
a low resistance in series with it
a low resistance in parallel with it
An energy saver light bulb that uses 11J of electrical energy gives same amount of light as ordinary bulb that uses
50 J
30 J
22 J
60 J
As per Ohm's law, V (potential difference) is equal to
I(current) + R(resistance of the conductors)
I(current)/R(resistance of the conductors)
I(current)×R(resistance of the conductors)
R(resistance of the conductors)/I(current)
As per Ohm's law, amount of current passing through a conductor is directly proportional to
convential current
potential difference
electromotive force
Electric field
8 cells, each having
e.m.f. 1.5 V and internal resistance 0.2 ohm are connected inseries.
By mistake two cells have been connected with the reversedterminals.
The current flowing through an external resistance of 1.4 ohm will be
1 A
4 A
3 A
2 A
2 resistances of 4kΩ and 6kΩ are joined in series, if a battery of 10 V is connected across ends, then potential difference across each resistance is
2 V, 3 V
6 V, 10 V
4 V, 6 V
8 V, 12 V
A large current of range such as 1A or 10A can be measured by means of
vernier calipers
Ammeter
Galvanometer
Voltmeter
To pass no current through it, an ideal voltmeter should have
no resistance
very small resistance
very large resistance
None of the above
As temperature rises, resistance of thermistor
Increases
Decreases
Remains same
May increase or decrease
If charge passes through a wire is 0.5C then current of 50 mA will flow in
20 seconds
12 seconds
15 seconds
10 seconds
With a cell of
e. m. f. 1.5 V the balancing point is obtained at a distance of 60 cm from one end of a potentiometerwire.
Find the p.d. between the two ends of the wire, if its total length is 1 m
1.75 V
0.5 V
1.5 V
2.5 V
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