NCERT Physics Class 12 Exemplar Ch 14 Semiconductor Electronics Materials Devices and Simple Circuits Part 3 (For CBSE, ICSE, IAS, NET, NRA 2022)

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26 Two car garages have a common gate which needs to open automatically when a car enters either of the garages or cars enter both. Devise a circuit that resembles this situation using diodes for this situation.

Ans:

Two Car Garages Have a Common Gate Automatically

OR gate gives output according to the truth table.

Title: Table of Gate Gives Output According to the Truth Table
ABC
000
011
101
111

Q 27 How would you set up a circuit to obtain NOT gate using a transistor?

Circuit to Obtain NOT Gate Using a Transistor
Title: Table of Input and Output
InputOutput
AA
01
10

Q 28 Explain why elemental semiconductor cannot be used to make visible LEDs.

Elemental semiconductor՚s band-gap is such that emissions are in IR region.

Q 29 Write the truth table for the circuit shown in Fig.

Name the gate that the circuit resembles.

Write the Truth Table for the Circuit

Ans:

Truth table

Title: Table of Truth Table
ABY
000
010
100
111

AND Gate

Q 30 A Zener of power rating 1 W is to be used as a voltage regulator. If Zener has a breakdown of and it has to regulate voltage which fluctuated between and , what should be the value of for safe operation (Fig.) ?

A Zener of Power Rating 1 W Voltage Regulator

And:

Developed by: