A current passes through a resistor. Let K₁ and K₂ represent the average kinetic energy of the conduction electrons and the metal ions respectively.

1.   K₁ < K₂

2.   K₁ = K₂

3.   K₁ > K₂

4.   Any of these three may occur

Electrons are emitted by a hot filament and are accelerated by an electric field as shown in the figure. The two stops at the left ensure that the electron beam has a uniform cross-section.

(a) The speed of the electron is more at B than at A.
(b) The electric current is from left to right.
(c) The magnitude of the current is larger at B than at A.
(d) The current density is more at B than at A

Choose the correct option 

1. (a) only 

2. (b), (c) 

3. (c), (d) 

4. (a), (d)

When no current is passed through a conductor,

Choose the correct option: 

Electric conduction takes place in a discharge tube due to the movement of

(a) positive ions
(b) negative ions
(c) electrons
(d) protons

Choose the correct option 

1. (a),(b), (c)

2. (b), (c), (a)

3. (c),(d), (b)

4. (a), (d), (b)