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JEE Revision Plan - Physics 12.2

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Question 1

An n-p-n transistor has three leads A, B and C. Connecting B and C by moist fingers, A to the positive lead of an ammeter, and C to the negative lead of the ammeter, one finds large deflection. Then, A, B and C refer respectively to :

Question 2

A Zener diode is connected to a battery and a load as shown below :
The currents

and

are respectively

Question 3

To get an output of 1 from the circuit shown in figure the input must be:

Question 4

The truth table given in fig. represents

Question 5

In the circuit below, A and B represent two inputs and C represents the output. The given circuit is

Question 6

A transmitting antenna at the top of a tower has a height 32 m and the height of the receiving antenna is 50 m. What is the maximum distance between them for satisfactory communication in line of sight (LOS) mode?

Question 7

For sky wave propagation, the radio wave must have a frequency range in between:

Question 8

A signal is to be transmitted through a wave of wavelength λ, using a linear antenna. The length l of the antenna and effective power radiated P_eff will be given respectively as:
(K is a constant of proportionality)