Question
Assertion : A transistor is a voltage-operating device.
Reason : Base current is greater than the collector current.

Answer

(d) A transistor is a current operating device because the action of transistor is controlled by the charge carriers (electrons or holes). Base current is very much lesser than the collector current.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Assertion : For making permanent magnets, steel is preferred over soft iron.
Reason $\quad$ : As retentivity of steel is smaller.
Assertion : Silicon is preferred over germanium for making semiconductor devices.
Reason : The energy gap for germanium is more than the energy gap of silicon.
Assertion : Work done by friction on a body sliding down an inclined plane is positive.
Reason : Work done is greater than zero, if angle between force and displacement is acute or both are in same direction.
Assertion : Environmental damage has increased the amount of ozone in the atmosphere.
Reason : Increase of ozone increases the amount of ultraviolet radiation on earth.
Assertion : The principle of superposition is not valid for gravitational force.
Reason : Gravitational force is a conservative force.
Assertion : According to law of conservation of mechanical energy change in potential energy is equal and opposite to the change in kinetic energy.
Reason : Mechanical energy is not a conserved quantity.
Assertion : Self-inductance is called the inertia of electricity.
Reason : Self-inductance is the phenomenon, according to which an opposing induced e.m.f. is produced in a coil as a result of change in current or magnetic flux linked in the coil.
Assertion : In everyday life the Doppler's effect is observed readily for sound waves than light waves.
Reason : Velocity of light is greater than that of sound.
Assertion : If an electric fan be switched on in a closed room, the air of the room will be cooled.
Reason : Fan air decrease the temperature of the room.
Assertion : If $\theta$ be the angle between $\vec{A}$ and $\vec{B}$, then
$
\tan \theta=\frac{\vec{A} \times \vec{B}}{\vec{A} \cdot \vec{B}}
$
Reason $\quad: \quad \vec{A} \times \vec{B}$ is perpendicular to $\vec{A} \cdot \vec{B}$