Electronic Devices (NEET Physics): Questions 44 - 47 of 65

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Question number: 44

» Electronic Devices » Logic Gates (Or, and, NOT, NAND and NOR)

Assertion-Reason▾

Assertion (Ꭺ)

De-morgen’s theorem A+B=AB may be explained by the following circuit

Circuit Diagram for De-morgen’s theorem

Circuit Diagram for De-Morgen’S Theorem

Circuit diagram shows the De-morgen’s theorem.

Reason (Ꭱ)

In the following circuit, for output 1 inputs A, B, C are 1, 0, 1.

 Combination of two NAND gates

Combination of Two NAND Gates

In figure combination of two NAND gate circuit is shown.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are false

Question number: 45

» Electronic Devices » Junction Transistor

MCQ▾

Question

In an NPN transistor circuit, the collector current is 10 mA. If 90 % of the electrons emitted reach the collector, the emitter current (I E) and base current (I B) are given by

Choices

Choice (4) Response

a.

I E = 1mA, I B = 11mA

b.

I E = 11mA, I B = 1mA

c.

I E = 9mA, I B =- 1mA

d.

I E =- 1mA, I B = 9mA

Question number: 46

» Electronic Devices » Junction Transistor

MCQ▾

Question

If L 1, L 2, L 3 are the lengths of the emitter, base and collector of a transistor then,

Choices

Choice (4) Response

a.

L 3 < L 2 > L 1

b.

L 1 = L 2 = L 3

c.

L 1 > L 3 > L 2

d.

L 3 < L 1 < L 2

Question number: 47

» Electronic Devices » Logic Gates (Or, and, NOT, NAND and NOR)

MCQ▾

Question

Given below are four logic gates symbol (figure). Those for OR, NOR and NAND are respectively

Choices

Choice (4) Response

a.

Symbols of logic gate of OR, NOR, NAND and AND– Choice A

Symbols of Logic Gate of or, NOR, NAND and and– Choice A

In figure symbol of logic gate is shown

b.

Symbols of logic gate of OR, NOR, NAND and AND– Choice B

Symbols of Logic Gate of or, NOR, NAND and and– Choice B

In figure symbol of logic gate is shown

c.

Symbols of logic gate of OR, NOR, NAND and AND– Choice C

Symbols of Logic Gate of or, NOR, NAND and and– Choice C

In figure symbol of logic gate is shown

d.

Symbols of logic gate of OR, NOR, NAND and AND– Choice D

Symbols of Logic Gate of or, NOR, NAND and and– Choice D

In figure symbol of logic gate is shown

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