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Q1. | The conductivity of materials found in nature ranges from 10^{9} ohm^{-1}m^{-1} to nearly 10^{18} ohm^{-1} m^{-1} from this it can be concluded that the conductivity of silicon in ohm^{-1} cm^{-1} will be nearly |

A. | 0.5 x 10^{-15} [Wrong Answer] |

B. | 0.5 x 10^{-21} [Wrong Answer] |

C. | 0.5 x 10^{-12} [Wrong Answer] |

D. | 0.5 x 10^{-3} [Correct Answer] |

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Explanation:-
Answer : DDiscuss it below :!! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

**Also Read Similar Questions Below :**

⇒ Which one of the following is a passive device/Component?

Transformer

Oscillator

Generator

None

⇒ The colour coding of a resistors shows 100 K, ± 10%. When the resistance was measured with an ohmmeter, it read

95 K

80 K

120 K

85 K

⇒ The total number of fundamental products of three variables is

3

5

8

16

⇒ It is found that a ship to ship communication suffers from fading. This can be avoided by using

space diversity

frequency diversity

broad band antenna

directional antenna

⇒ X(

*t*) is a stationary process with the power spectral density S

_{x}(

*f*) > 0 for all

*f*. The process is passed through a system shown be

S

_{y}(

*f*) > 0 for all

*f*

S

_{y}(

*f*) = 0 for |f| > 1kHz

S

_{y}(

*f*) = 0 for

*f*=

*nf*

_{0},

*f*

_{0}= 2kHz,

*n*any integer

S

_{y}(

*f*) = 0 for

*f*= (2

*n*+ 1)

*f*

_{0}= 1 kHz,

*n*any integer

⇒

Match the following:

List I (Bits operator in C) | List II (Meaning) | ||
---|---|---|---|

A. | ˜ | 1. | Bitwise XOR |

B. | & | 2. | Bitwise AND |

C. | | | 3. | Bitwise OR |

D. | U | 4. | One's complement |

A-1, B-2, C-3, D-4

A-4, B-3, C-2, D-1

A-2, B-3, C-1, D-4

A-4, B-2, C-3, D-1

⇒ Which of the following is known as insulated gate FET?

JFET

MOSFET

Both JFET and MOSFET

None of the above

⇒ The resistance values of a PIN diode under positive bias and negative bias respectively are about

a few ohms and a kilo ohms

about 100 ohms and 1000 ohms

about 0.1 ohm and 100 ohms

about 1000 ohms and 10000 ohms

⇒

Match the following:

List I | List II | ||
---|---|---|---|

A. | Ratio of maximum energy stored to energy dissipated per cycle | 1. | Propagation constant |

B. | TEM mode is loss less medium | 2. | Cutoff frequency is zero |

C. | Ratio of frequency in radian to phase velocity of EM wave | 3. | Quality factor of cavity |

D. | TEM is the mode of lowest cutoff frequency | 4. | Cylindrical waveguide |

A-3, B-2, C-4, D-1

A-2, B-3, C-1, D-4

A-3, B-2, C-1, D-4

A-2, B-3, C-4, D-1

⇒ The phase angle of lead circuit is

between 0 and -90°

between 0 and +90°

90°

more than 90°

⇒ The slope of log magnitude curve changes by - 40 dB/decade at a certain frequency and the error between asymptote and actual curve is positive. This means that

a double pole is present

a pair of complex conjugate poles is present

either (a) or (b)

neither (a) nor (b)

⇒ The equation

*v*(

*t*) = A cos [ω

*+ φ(*

_{c}t*t*)] where A and ω

_{c}are constant and φ(

*t*) is a function of base signal represents

- Phase modulation
- Amplitude modulation
- Angle modulation
- Frequency modulation

3 only

1, 3 and 4

1, 2, 3, 4

3 and 4 only

⇒ Method of images is applicable to which fields?

Electrostatic fields only

Electrodynamic fields only

Neither electrostatic fields nor electro-dynamic fields

Both electrostatic fields and electro-dynamic fields

⇒ Which of the following closely represents the resistance-temperature characteristics of thermistor?

R

_{T}=

*a*R

_{0}e

^{b/t}

R

_{T}=

*a*R

_{0}E

^{-b/t}

R

_{T}= -

*a*R

_{0}e

^{-b/t}

R

_{T}= - R

_{0}e

^{b/t}

⇒ Each kilometer of travel in electromagnetic radiation means a time delay of

330 μs

33 μs

3.3 μs

0.33 μs

⇒ In TV broadcast, UHF range is

606 - 790 MHz

100 - 150 MHz

41 - 68 MHz

174 - 230 MHz

⇒ The voltage

*e*

_{o}indicated in the figure has been measured by an ideal voltmeter. Which of the following can be calcula

Bias current of inverting input only

Bias current of inverting and non-inverting inputs only

Input offset current only

Both the bias currents and the I/P offset current

⇒ In the BJT amplifier shown in the figure is the transistor is biased in the forward active region. Putting a capacitor across R

_{E}

decrease the voltage gain and decrease the I/P impedance

increase the voltage gain and decrease the I/P Impedance

decrease the voltage gain and Increase the I/P impedance

none of the above

⇒ Which mode is usually preferred for cascading?

CE

CB

CC

Any of the above

⇒ A depletion type NMOS is operated in enhancement mode. V

_{p}= - 4 volts. For V

_{GS}= + 3 volts as V

_{DS}is increased, I

_{D}becomes nearly constant when V

_{ps}equals

1 volt

3 volts

4 volt

7 volts

⇒ A sinusoidal signal with peak to peak amplitude of 1.536 volt is quantized into 128 levels using a mid-rise uniform quantizer. The quantization noise power is

0.768 V

48 x 10

^{-6}V

12 x 10

^{-6}V

3.072 Volt

⇒ A half wave diode rectifier uses a diode having forward resistance of 50 ohms. The load resistance is also 50 ohms. Then the voltage regulation is

0.2

0.5

1

2

⇒ Which of the following plot can be directly used to determine β?

V

_{CE}versus

*i*

_{C}for constant I

_{B}

V

_{BE}versus

*i*

_{B}for constant V

_{CE}

V

_{CB}versus

*i*

_{C}for constant I

_{B}

All of the above

⇒ In free space

phase velocity is greater than light velocity

phase velocity is equal to group velocity

phase velocity is equal to light velocity

Both (b) and (c)

⇒ If

*r*

_{e}is ac resistance of diode, the Thevenin input impedance of a differential amplifier is

*r*

_{e}

b

*r*

_{e}

2 b

*r*

_{e}

0.5 b

*r*

_{e}

⇒ Which of the following uses 'transferred electron effect' for production of microwaves?

Silicon

Germanium

Metal-semiconductor junction

Gallium Arsenide

⇒ A high frequency series inverter consists of

a number of series inverters in series

a number of series inverters in parallel

a number of parallel inverters in parallel

a number of parallel inverters in series

⇒ How many and which types of machine cycles are needed to execute PUSH PSW by 8085 microprocessor?

2, Fetch and memory write

3, Fetch and memory write

3, Fetch and memory read

3, Fetch and memory read and memory write

⇒ The function in the given figure can be writte

*u*(

*t*- 1) sin p (

*t*- 1) -

*u*(

*t*- 3) sin p (

*t*- 3) +

*u*(

*t*- 4) sin p (

*t*- 4) -

*u*(

*t*- 6) sin p (

*t*- 6)

*u*(

*t*- 1) sin p (

*t*- 1) -

*u*(

*t*- 3) sin p (

*t*- 3) +

*u*(

*t*- 4) sin p (

*t*- 4)

*u*(

*t*- 1) sin p (

*t*- 1) +

*u*(

*t*- 4) sin p (

*t*- 4)

*u*(

*t*- 1) sin 2p (

*t*- 1) +

*u*(

*t*- 4) sin 2p (

*t*- 4)

⇒ Which one of the following is the correct sequence of the numbers represented in the series given below?

2, 3, 4, 5, 6......

2, 4, 6, 8, 10 .....

2, 4, 6, 10, 12......

2, 4, 6, 10, 16 .....