A current of 2 A is passed through a conductor of resistance 10 ?. The potential between the ends of the conductor is
1.50 V
2.20 V
3.1/5 V
4.2 V
A resistance wire is made into 5 equal parts and all the five parts are connected in parallel. What is the ratio of the effective resistance to the original resistance
1.5-Jan
2.10-Jan
3.25-Jan
4.10
A tape recorder is marked as 6 V and 300 mA. If the voltage drops to 5V the decrease in current of the tape recorder is
1.250 mA
2.200 mA
3.50 A
4.50 mA
A wire has a length of 1 m area of cross section of 0.5 mm2 and specific resistance of 50 ? 10-8 ?m. The resistance of the wire is
1.10 ?
2.5 ?
3.1 ?
4.20 ?
At constant temperature the current flowing in a conductor is proportional to potential difference between the ends. This is
1.Joule�s law
2.Faraday�s law
3.Lenz�s law
4.Ohm�s law
The bulb is labeled as 250 V 100 W. What is the resistance of the filament of the bulb in ohm
1.350
2.625
3.150
4.25000
The current in an electric circuit is
1.proportional to the resistance
2.proportional to the conductance
3.inversely proportional to the potential difference
4.proportional to temperature
The expression for specific resistance of a wire is
1.L/RA
2.RA/L
3.AL/R
4.R/AL
The resistance of a conductor is due to
1.the flow of current in the conductor
2.the collision of electrons with atoms
3.The attractive force between electrons and protons
4.the thermal agitation of electrons
The resistance of a conductor with a diameter of 2 mm is 20 ?. If the diameter is doubled with length remaining the same the resistance becomes
1.5 ?
2.10 ?
3.30 ?
4.40 ?
The resistance of a medal in terms of its volume v is
1.?Lv/A
2.?L/Av
3.?L2/v
4.?v/ L2
The specific resistance of a wire depends on
1.its radius
2.Its length
3.the material of the wire
4.its shape
The unit of conductivity is
1.ohm-metre
2.mho-metre
3.mho-metre-1
4.ohm-metre-1
The unit of resistivity is
1.ohm-metre
2.mho-metre-1
3.mho-metre
4.ohm-metre-1
Three resistance are connected to from the side of a triangle ABC. If the resistances AB BC CA respectively are 40 ohm 60 ohm and 100 ohm the effective resistance between the points A and B
1.32 ?
2.50 ?
3.64 ?
4.200 ?
Two resistors each of resistance 6 ? are connected in parallel and the combination in series with a resistor of resistance 2 ? and an accumulator of emf 2 ?. The current in the circuit is
1.1/7 A
2.2.5 A
3.0.4 A
4.7:00 AM
Two resistors of 6 ? and 4 ? are connected in parallel and the combination is connected in series with a resistance of 2.6 ? and an accumulator of e.m.f. 2V. The current in the circuit in ampere is
1.2/12.6
2.2/26.6
3.5-Feb
4.2/4.6
When a potential difference of 12 V cause a current flow of 3 A in a conductor what is the resistance of the conductor
1.0.5 ?
2.2 ?
3.4 ?
4.6 ?