Drift velocity of Electron

Q.

When no current is passed through a conductor

1. the free electrons do not move

2. the average speed of a free-electron over a large period of time is zero

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

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

Q.

It is known that the drift velocity of electrons is only a few $mm/sec$ for a current of a few amperes. then how is it possible that a current is established almost instantaneously when a circuit is closed? for example, a bulb glows as soon as the connection is switched on. Explain.

Q.

Suppose a British official tried transmitting electricity generated from London to New Delhi in ${17}^{th}$ century when India had no access to electricity. Taking the distance between London & New Delhi approximately as 7000 km, find out the time taken to transmit electricity (assume a metal conductor for transmission).

1. 0.1 s
2. 0.023 s
3. 2.3 s
4. Electricity cannot be transmitted over such long distances

Q. The speed of flow of electrons is as low as 1 mm/s in a circuit. If the length of the wire from the battery to the bulb is 60mm, what is the time taken for the bulb to light up?

1. Instantaneous
2. 20s
3. 60s
4. It never lights up

Q. A particle is moving from point A to point B and covers the entire distance of 10 km in just 2 minutes. What would be the speed at which the particle was travelling?

1. 83.3 m/s
2. 83.3 km/s
3. 20 km/s

4. 5 m/s

Q. State True or False.
When a potential difference is applied between the ends of a conductor, the free electrons inside the conductor move in only one direction with a velocity $v_d$, which is commonly referred to as drift velocity. The electrons will not have any movement in any other direction.

1. True
2. False

Q.

The speed of transmission of electricity is equal to the speed of light which is given as $3\times {10}^{8}km{s}^{-1}$.

1. True
2. False