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Q1. | The earliest uses of electromagnetic waves were |

A. | point to point communication [Wrong Answer] |

B. | radar [Wrong Answer] |

C. | both (a) and (b) [Correct Answer] |

D. | neither (a) nor (b) [Wrong Answer] |

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**Also Read Similar Questions Below :**

⇒ Which of the following couplings may cause unwanted clamping?

Resistive

Inductive

Capacitive

Both (a) or (b)

⇒ Two network said to be dual to each other

if mesh equation of one is same to other of node equation

if mesh equation of both is same

if node equation of both is same

neither mesh equation nor node equation is same

⇒ In telecast

video and audio signals are frequency modulated

video signals are frequency modulated but audio signals are amplitude modulated

both audio and video signals are amplitude modulated

video signals are amplitude modulated and audio signals are frequency modulated

⇒ The intrinsic carrier concentration of silicon sample at 300 K is 1.5 x 10

^{16}/m

^{3}. If after doping, the number of majority carriers is 5 x 10

^{20}/m

^{3}. The minority carrier density is

4.5 x 10

^{11}/m

^{3}

3.33 x 10

^{4}/m

^{3}

5 x 10

^{20}/m

^{3}

3 x 10

^{-5}/m

^{3}

⇒ The forbidden energy gap between the valence band and conduction band will be least in case of

metals

semiconductors

insulators

all of the above

⇒ The voltage gains of an amplifier without feedback and with negative feedback respectively are 100 and 20. The percentage of negative feedback (β) would be

0.4

0.05

0.2

0.8

⇒ The absorption of EM wave by the atmosphere depends on

polarization of waves

frequency in use

dist. from T

_{y}

height of antenna

⇒ Which of the following antennas is λ /4 length?

Dipole

Marconi

Monopole

Parabolic

⇒ To ensure that only dominant TE

_{10}mode propagates in a rectangular waveguide, the operating frequency

must be more than cutoff frequency of

*TE*

_{10}mode

must be less than cutoff frequency of

*TE*

_{20}mode

must be more than cutoff frequency of

*TE*

_{10}mode and less than cutoff frequency of TE

_{20}mode

must be less than cutoff frequency of

*TE*

_{10}mode

⇒ FM broadcast lies in which band?

HF

SHF

UHF

VHF

⇒ The number of product terms in the minimized sum of product expression obtained through the following

*k*map is (where "

*d*" denotes don't care states)

2

3

4

5

⇒ Which of the following will increase the antenna radiation efficiency?

Use of larger section of conductor

Providing insulation on conductor

Top loading of antenna

Any of the above

⇒ In 8085 the pins for + 5 V input and ground are

20 and 40 respectively

40 and 20 respectively

1 and 2 respectively

1 and 1 respectively

⇒ In a superheterodyne receiver, the IF is 455 kHz. If it is tuned to 1200 kHz, the image frequency will be

1655 kHz

2110 kHz

745 kHz

910 kHz

⇒ In telephone, the dial tone has a frequency of

5 Hz

15 Hz

33 Hz

233 Hz

⇒ Metals approach superconductivity conditions

near absolute zero temperature

near critical temperature

at triple point

under the conditions of high temperature and pressure

⇒ Which of the following wave remains unaffected during day and night?

Tropospheric wave

Sky wave

Ground wave

None of the above

⇒ The divergence of the electric field intensity at any point equals

1/4 pε

_{0}times the volume charge density

l/ε

_{0}times the volume charge density at that point

ε

_{0}times the volume charge density at that point

the volume charge density at that point

⇒ For a message signal

*m*(

*t*) = cos (2p

*f*) and the carrier frequency

_{m}t*f*, which of the following represents a single side band (SSB) signal?

_{c}cos (2p

*f*) cos (2p

_{m}t*f*)

_{c}tcos (2p

*f*)

_{c}tcos [2p(

*f*+

_{c}*f*) t]

_{m}[1 + cos (2p

*f*) cos (2p

_{m}t*f*)]

_{c}t⇒ The ripple factor of power supply is a measure of

its filter efficiency

diode rating

its voltage regulation

purity of power output

⇒ A linear discrete time system has the char. equation

*z*

^{3}- 0.81

*z*= 0, the system is

stable

marginally stable

unstable

stability cannot be assessed from the given information

⇒ In an RC series circuit R = 100 Ω and X

_{C}= 10 Ω. In this circuit

the current and voltage are in phase

the current leads the voltage by about 6°

the current leads the voltage by about 84°

the current lags the voltage by about 6°

⇒ The Gaussian filter characteristic figure is realiza

TRUE

FALSE

⇒ A dc machine has 6 poles all connected in series. Each pole has 9 H inductance and field current is 2 A. Total inductance and total energy stored are

9 H and 18 J

18 H and 36 J

54 H and 108 J

108 H and 216 J

⇒ ALU processes

decimal numbers

binary numbers

hexadecimal numbers

all of the above

⇒ The peak factor is the ratio of

peak and rms values

peak and average values

rms and average values

none of the above

⇒ Which one of the following is true?

Alternating voltage and current contain odd and even harmonics

The inductance in a circuit reduces the effect of harmonics and makes current wave more sinusoidal than voltage wave

Alternating voltage and current waveforms, in general, do not contain odd harmonics

Inductance of a circuit does not alter wave shape at all

⇒ In the following transistor circuit

*V*

_{BE}= 0. 7 V,

*r*= 25mV/I

_{c}_{E}, and β and the capacitance are very l

-180

-120

-90

-60

⇒ Which of the following is not correct?

P(A) = P(A) - 1

0 ≤ P ≤ 1

If A and B are mitual exclusive then P(A + B) = P(A) + P(B)

P(A) = 1 - P(A)

⇒ How many interrupts are there in 8085 microprocessor?

4

5

6

8