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JEE Revision Plan - Physics 12.1

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Question 1

The numbers of AM broadcast stations that can be accommodated in a 400 kHz bandwidth for the highest modulating frequency 20 kHz will be

Question 2

Which of the following is correct statement for the maximum range, dmax, of radar is

Question 3

An audio signal consists of two distinct sounds: one a human speech signal in the frequency band of 200 Hz to 2700 Hz, while the other is a high-frequency music signal in the frequency band of 10200 Hz to 15200 Hz. The ratio of the AM signal bandwidth required to send both the signals together to the AM signal bandwidth required to send just the human speech is:

Question 4

The value of the resistor, , needed in the dc voltage regulator circuit shown here, equals:

Question 5

A 2V battery is connected across AB as shown in the figure. The value of the current supplied by the battery when in one case battery’s positive terminal is connected to A and in other case when positive terminal of battery is connected to B will respectively be:

Question 6

The ratio (R) of output resistance r0, and the input resistance ri in measurements of input and output characteristics of a transistor is typically in the range:

Question 7

An unknown transistor needs to be identified as a npn or pnp type. A multimeter, with +ve and −ve terminals, is used to measure resistance between different terminals of transistor. If terminal 2 is the base of the transistor then which of the following is correct for a pnp transistor?

Question 8

The current gain of a common emitter amplifier is 69. If the emitter current is 7.0 mA, collector current is:

Question 9


Find Rc such that transistor acts as an open switch. VBE = 0.7V

Question 10


Find minimum input voltage such that transistor is driven into saturation. VBE = 0.7V

Question 11

Relaxation oscillators are not used to generate which of the following:

Question 12

Which of the following statements is incorrect regarding the working of a transistor?

Question 13

When a transistor is connected in common-base mode, the collector current is found to be 5.488 mA when the emitter current is 5.60 mA. The base current amplification factor is

Question 14

When a transistor is connected in common base mode, the current gain is found to be α = 0.98 and the reverse saturation current for the collector-base junction is found to be 0.6 𝜇𝐴. On connecting the same transistor in common-emitter mode as an amplifier the base current is found to be 20 𝜇𝐴, the magnitude of the collector current in this case is

Question 15

The common emitter current gain for a transistor is 50. If the resistance connected to the collector is of 2 kΩ, the input resistance is 500 Ω and the voltage applied to the base is 0.02 V, then the power gain is equal to:
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Mar 15JEE & BITSAT