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Q1. | Computer virus is a piece of rough software of unknown origin that |

A. | copies itself like a breeding germ [Wrong Answer] |

B. | spreads from one machine to another [Wrong Answer] |

C. | eats away processing power [Wrong Answer] |

D. | all of the above [Correct Answer] |

View Answer
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 :**

⇒ In C the keywords are also called

special words

reserved words

class words

character words

⇒ In FM, the frequency deviation is

always constant

directly proportional to modulating frequency

inversely proportional to modulating frequency

proportional to amplitude of modulating signal

⇒ In a reverse biased

*p*-

*n*junction, the reverse bias is 4V. The junction capacitance is about

0.1 F

4 μF

10

*n*F

20

*p*F

⇒ Frequency modulation consists in

varying the frequency and amplitude of the carrier in accordance with the instantaneous value of modulating signal

varying the amplitude of the carrier in accordance with the instantaneous value of the modulating voltage

varying the frequency of the carrier voltage in accordance with the instantaneous value of the modulating voltage

vary the frequency of the carrier voltage

⇒ Frequency shifting keying is basically a method involving

amplitude modulation

frequency modulation

phase modulation

none of the above

⇒ To couple a coaxial line to a parallel wire line, it is best to use a

balun

slotted line

quarter wave transformer

directional coupler

⇒ If the height of transmitting and receiving antenna in a LOS system are 49 meter and a 9 meter respectively then the distance up to which communication may be possible is about

40 km

110 km

400 km

1100 km

⇒ Fourier transform is defined for

periodic

non-periodic

finite duration

all

⇒ The number of free electrons in acceptor atom is

1

2

3

4

⇒ The current gain of a transistor is the ratio of

emitter current to base current

emitter current to collector current

collector current to base current

collector current to emitter current

⇒ Which of the following term does not apply to the Yagi-Uda array?

High gain

Folded dipole

Parasitic

Good bandwidth

⇒ From an

*n*channel JFET for V

_{DS}constant and if V

_{GS}is made more negative, pinch off would occur at

higher value of drain current

saturation value of drain current

zero drain current

gate current equal to drain current

⇒ If load impedance Z

_{L}>> Z

_{0}, then

Z

_{0}= Z

_{L}(VSWR)

Z

_{L}= Z

_{0}(VSWR)

Z

_{L}= Z

_{0}(VSWR - 1)

Z

_{L}= Z

_{0}VSWR

⇒ For plane wave propagating in free space or two conductor transmission line, what must be the relationship between the phase velocity

*v*, the group velocity

_{p}*v*and speed of light

_{g}*c*?

*v*>

_{p}*c*>

*v*

_{g}*v*<

_{p}*c*<

*v*

_{g}*v*=

_{p}*c*=

*v*

_{g}*v*<

_{p}*v*<

_{g}*c*

⇒ If ω

_{0}is the angular frequency of rotation of electron in the absence of magnetic field, the angular frequency ω, when a magnetic field B is acting is ω ≅ ω

_{0}+ (

*e*/2

*m*)B.

TRUE

FALSE

⇒ For the design of a sequential circuit having 9 states, minimum number of memory elements required is

3

4

5

9

⇒ Assume that

*x*= 5 and

*y*= 2. Then in Java operation

*x*+ =

*y*, the result is

*x*= 7

*x*= 2

*x*= 3

*x*= 2

⇒ If ROC of

*x*[

*n*] is R

*then ROC of*

_{1}*a*

^{n}*x*[

*n*] is

R

_{1}

*a*

R

_{1}/

*a*

*a*/R

_{1}

R

_{1}+

*a*

⇒ For an antenna of height

*h*metres, the radio horizon is equal to

_{t}4

*h*metres

_{t}4

*h*km

_{t}2.5

*h*km

_{t}2.5

*h*metres

_{t}⇒ When microwave signals follow the curvature of the earth, this is known as

the Faraday effect

ducting

tropospheric scatter

ionospheric reflection

⇒ An n type semiconductor is illuminated by a steady flux of photons with energy greater than the band gap energy. The change in conductivity Δσ obeys which relati

Δσ = 0

Δσ =

*e*(σ

_{n}+ σ

_{p}) Δ

_{n}

Δσ =

*e*(μ

_{n}Δ

_{n}- μ

_{p}Δ

_{p})

Δσ =

*e*μ

_{n}Δ

_{n}

⇒ An engineer designs an amplifier to have a voltage gain of 60, but when constructed it only had a gain of 50. How much feedback should be used to provide the desired level?

0.0003

0.0033

0.013

0.033

⇒ For pole-zero plot shown, the system is ________

minimum phase

maximum phase

mixed phase

none of these

⇒ Which of the following pairs are correctly matched?

- Brune's realisation : realisation with ideal transformer.
- Cauer realisation : ladder realisation.
- Bott Duffin realisation : with non ideal transformer.

1, 2 and 3

2 and 3

1 and 3

1 and 2

⇒ A 20 m antenna gives a certain uplink gain at frequencies of 4/6 GHz. For getting same gain in the 20/30 GHz band, antenna size required is metre.

100

4

1

10

⇒ If

*f*is the frequency of electromagnetic wave,

*f*

*is cutoff frequency, then in a rectangular waveguide*

_{c}attenuation is low when

*f*>

*f*

_{c}attenuation is low when

*f*<

*f*

_{c}attenuation is high when

*f*<

*f*

_{c}either (b) or (c)

⇒ The noise figure of klystron amplifier is about

25 dB

3 dB

zero

1 dB

⇒ If

*a*and

*b*are the width and height of rectangular wave-guide the cut off wavelength λ

_{c}for TE

_{20}mode is equal to

*a*

*a*+

*b*

*a*-

*b*

*a*

^{2}+

*b*

^{2}

⇒ MS Access is a DBMS software.

TRUE

FALSE

⇒ The input voltage for starting oscillations in an oscillator is caused by

negative feedback

positive feedback

noise voltage in resistors

a special generator