Download App

Electronics — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsElectronics1 Mark
Question
Assertion : In a common emitter transistor amplifier the input current is much less than the output current.
Reason : The common emitter transistor amplifier has very high input impedance.
✓

Answer

(c) In common emitter transistor amplifier current gain $\beta>1$, so output current > lnput current, hence assertion is correct.Also, input circuit has low resistance due to forward biasing to emitter base junction, hence reason is false.

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

Explore more

More "Assertion & Reason" from Electronics→Electronics — all question types→JEE physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

Assertion : Mass and energy are not conserved separately, but are conserved as a single entity called mass-energy.
Reason : Mass and energy conservation can be obtained by Einstein equation for energy.
→
Assertion : A bulb connected in series with a solenoid is connected to ac source. If a soft iron core is introduced in the solenoid, the bulb will glow brighter.
Reason : On introducing soft iron core in the solenoid, the inductance increases.
→
Assertion : When $P N$-junction is forward biased then motion of charge carriers at junction is due to diffusion. In reverse biasing. The cause of motion of charge is drifting.
Reason : In the following circuit emitter is reverse biased and collector is forward biased.
Image
→
Assertion : On a rainy day sound travel slower than on a dry day.
Reason : When moisture is present in air the density of air increases.
→
Assertion : The frequency of a second pendulum in an elevator moving up with an acceleration half the acceleration due to gravity is $0.612 s$.
Reason : The frequency of a second pendulum does not depend upon acceleration due to gravity.
→
Assertion : Two bodies of masses $M$ and $m(M>m)$ are allowed to fall from the same height if the air resistance for each be the same then both the bodies will reach the earth simultaneously.
Reason : For same air resistance, acceleration of both the bodies will be same.
→
Assertion : The average and instantaneous velocities have same value in a uniform motion.
Reason : In uniform motion, the velocity of an object increases uniformly.
→
Assertion : A body that is a good radiator is also a good absorber of radiation at a given wavelength.
Reason : According to Kirchoff's law the absorptivity of a body is equal to its emissivity at a given wavelength.
→
Assertion : Steel is more elastic than rubber.
Reason : Under given deforming force, steel is deformed less than rubber.
→
Assertion : For best contrast between maxima and minima in the interference pattern of Young's double slit experiment, the intensity of light emerging out of the two slits should be equal.
Reason: The intensity of interference pattern is proportional to square of amplitude.
→