Tag: electronic devices

Questions Related to electronic devices

In the forward bias characteristic curve, a diode appears as :

physics electronic devices introduction to diodes circuit components junction diode and its voltage current characteristics

  1. an OFF switch

  2. a high resistance

  3. an ON switch

  4. a capacitor

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Correct Option: C
Explanation:

Diode allows the current to pass through it when it is forward biased.
In the forward biased characteristics curve, a diode appears as an ON switch.

A p-n junction diode cannot be used

physics electronic devices introduction to diodes circuit components junction diode and its voltage current characteristics

  1. as a rectifier.

  2. for converting light energy to electric energy.

  3. for getting light radiation.

  4. for increasing the amplitude of an AC signal.

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Correct Option: D
Explanation:

To increase the amplitude of an AC signal, transistors are used. p-n junction diodes can be used as rectifiers and in photo-diode and LED.

The size of E-coli bacteria is about :

physics electronic devices nanoscience and nanotechnology nanotechnology logic gates

  1. 500 nm

  2. 1000 nm

  3. 2000 nm

  4. 3000 nm

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Correct Option: C
Explanation:

Each E-coli bacterium measures 0.5 μm in width by 2 μm in length i.e, 2000 nm.
So option (b) is correct,

Which of the following is logically equivalent to $(p\wedge q)$ ?

physics electronic devices boolean algebra digital electronics and logic gates logic gates

  1. $p\rightarrow q$

  2. $\sim p \, \wedge \sim q$

  3. $p\, \wedge \sim q$

  4. $\sim (p\rightarrow \sim q)$

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Correct Option: D

The Boolean expression $P+\overline { P } Q$, where $P$ and $Q$ are the inputs of the logic circuit, represents  

physics electronic devices boolean algebra digital electronics and logic gates logic gates

  1. AND gate

  2. NAND gate

  3. NOT gate

  4. OR gate

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Correct Option: A

Person who use boolean algebra for describing the operation of logic gates first was

physics electronic devices boolean algebra digital electronics and logic gates logic gates

  1. Boole

  2. Shannon

  3. Schottky

  4. Zener

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Correct Option: B
Explanation:

Person who use boolean algebra for describing the operation of logic gates first was Claude Shannon. 

In the binary number system, the number $100$ represents

physics electronic devices boolean algebra digital electronics and logic gates logic gates

  1. one

  2. three

  3. four

  4. hundred

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Correct Option: C
Explanation:

In binary number system only $0$'s and $1$'s are used to built the whole number system.
Hence,
$0 = 0$
$1 = 1$
Start back at $0$ again, but add $1$ on the left,
$2 = 10$
$3 = 11$
Start back at $0$ again, and add one to the number on the left, but that number is already at $1$, so it also goes back to $0$ and $1$ is added to the next position on the left. Hence,
$4 = 100$ .... and so on.

Boolean algebra is essentially based on 

physics electronic devices boolean algebra digital electronics and logic gates logic gates

  1. symbols

  2. logic

  3. truth

  4. numbers

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Correct Option: B
Explanation:

Boolean algebra is essentially based on logic. It is also known as logical algebra.

The Boolean algebra uses

physics electronic devices boolean algebra digital electronics and logic gates logic gates

  1. two digits, $0$ and $1$.

  2. two digits, $1$ and $2$.

  3. two digits, $0$ and $2$.

  4. $10$ digits, $0, 1, 2, 3, 4, 5, 6, 7, 8, 9$.

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Correct Option: A
Explanation:

The Boolean algebra uses binary number system i.e. two digits $0$ and $1$.

The value of $\bar{1}$ +$\bar{1}$  is

physics electronic devices boolean algebra digital electronics and logic gates logic gates

  1. $2$

  2. $0$

  3. $1$

  4. $10$

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Correct Option: B
Explanation:

$\bar 1 + \bar 1 = 0 + 0 = 0$