Drift Velocity MCQ - Practice Questions with Answers

The drift velocity of the electrons is v when current I is flowing through it. If both the radius and currents are doubled then drift velocity will be

A potential difference V is applied to a copper wire of length l and radius r. If V is doubled, the drift velocity

Two cylindrical rods of uniform cross-sectional area and having free electrons per unit volume respectively, are joined in series. A current flows through them in a steady state. Then the ratio of the drift velocity of the free electron in the left rod to the drift velocity of the electron in the right rod is:

A straight conductor of uniform cross section carries a current I. Let s be the specific charge of an electron. The momentum of all the free electrons per unit length of the conductor, due to their drift velocities only, is

A potential difference $V$ is applied to a copper wire of length $l$ and thickness $d$. If the thickness is doubled, the drift velocity becomes

Which of the following is not true regarding the functions of gibberellins?
I.    Gibberellins induces female flower expression
II.    Ripening of citrus fruits can be caused by gibberellins
III.    Gibberellins delays the seed germination in the positively photoblastic seeds of lettuce and tobacco in complete darkness.
IV.    Gibberellins have been shown to be more effective than auxins in inducing the parthenocarpy in fruits like apples, pears, etc.
V.    Gibberellins induce sub-apical meristem to develop faster
Choose the option with all correct statements