Current Electricity

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Current Electricity - 01

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Q1. In a current carrying conductor the net charge is *

1 分

1.6 x 10^–19 coulomb

6.25 x 10^–18 coulomb

zero

Infinite

Q2. The current which is assumed to be flowing in a circuit from positive terminal to negative, is called *

1 分

direct current

pulsating current

conventional current

alternating current

Q3. When no current is passed through a conductor *

1 分

the average of the velocities of all the free electrons at an instant is non zero

the average speed of a free electron over a large period of time is not zero

the free electrons do not move

the average velocity of a free electron over a large period of time is zero

Q4. A current passes through a wire of non uniform crosssection. Which of the following quantities are independent of the cross-section? *

1 分

The charge crossing

Drift velocity

Current density

Free-electron density

Q5. In the equation AB = C, A is the current density, C is the electric field, Then B is *

1 分

resistivity

resistance

potential difference

conductivity

Q6. Drift velocity of electrons is due to *

1 分

repulsion to the conduction electrons due to inner electrons of ions

collision of conduction electrons with each other

motion of conduction electrons due to electric field E

motion of conduction electrons due to random collisions

Q7. The speed at which the current travels, in conductor, is nearly equal to *

1 分

3 × 10^4 m/s

3 × 10^5 m/s

4 × 10^6 m/s

3 × 10^8 m/s

Q8. In the absence of an electric field, the mean velocity of free electrons in a conductor at absolute temperature (T) is *

1 分

zero

independent of T

proportional to T

proportional to T^2

Q9. When a potential difference V is applied across a conductor at a temperature T, the drift velocity of electrons is proportional to *

1 分

√V

√T

Q10. For which of the following dependence of drift velocity vd on electric field E, is Ohm’s law obeyed? *

1 分

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