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Q1. | The smallest change in sound intensity that can be detected by human ear is __________ dB. |

A. | 1 [Wrong Answer] |

B. | 3 [Correct Answer] |

C. | 10 [Wrong Answer] |

D. | 20 [Wrong Answer] |

View Answer
Explanation:-
Answer : BDiscuss 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 :**

⇒ A collector collects

electrons from the base in case of N-P-N transistor

electrons from the emitter in case P-N-P transistor

holes from the base in case of N-P-N transistor

holes from the base in case of P-N-P transistor

⇒ The modulus of counter in the given figur

1

2

3

4

⇒ The impulse response of the DT - LTI system is given be

1 and 2

2 and 3

1 and 3

1, 2 and 3

⇒ The maximum efficiency of class A amplifier is

1

0.818

0.5

0.4

⇒ An arithmetic statement in C must be

integer mode arithmetic statement

real mode arithmetic statement

mixed mode arithmetic statement

any of the above

⇒ In the circuit of figure β = 100 and quiescent value of base current is 20 μA. The quiescent value of colle

0.2 μA

2 μA

2 mA

20 mA

⇒ The trignometric Fourier series of an even function of time does not have

dc term

cosine term

sine term

odd harmonic terms

⇒ Which of the following is error correcting code?

EBCDIC

Gray

Hamming

ASCII

⇒ A coil has a designed for high Q performance at a rated voltage and a specified frequency. If the frequency of operation is doubled, and the coil is operated at the same rated voltage, then the Q factor and the active power P consumed by the coil will be affected as follows.

P is doubled, Q is halved

P is halved, Q is doubled

P remains constant, Q is doubled

P decreases 4 times, Q is doubled

⇒ In the two ports network shown in the figure, Z

_{12}and Z

_{21}are, respecti

*r*

_{e}and β

*r*

_{0}

0 and - β

*r*

_{0}

0 and β

*r*

_{0}

*r*

_{e}and - β

*r*

_{0}

⇒ A doped semi-conductor is called

impure semi-conductor

dipole semi-conductor

bipolar semi-conductor

extrinsic semi-conductor

⇒ In all insulators the bonding is covalent.

TRUE

FALSE

⇒ Thu advantage of using a dual stop ADC in a digital voltmeter is that

its conversion time is small

its accuracy high

output is in BCD format

it does not require a comparator

⇒ In end fire array the principle direction of radiation

is perpendicular to the array axis

is perpendicular to the array axis and also to the plane containing the array elements

coincides with the direction of the array

is at 45° to the direction of array axis

⇒ In laboratory experiment the output from reflex klystron is moderated by square wave because

it is easy to generate a square wave

crystal diode operates in square law region of

*i*-

*v*characteristics

it prevents frequency modulation

detector circuit is less complicated

⇒ Homodyne detection means

coherent detection

non-coherent detection

asynchronous detection

none of the above

⇒ The instruction

`MVI A, 20`

in 8085 meanscontents of memory location 20 are brought into the accumulator

the value 20 is brought into accumulator

either (a) or (b)

neither (a) nor (b)

⇒ Double spotting in a receiver is due to

poor sensitivity of RF amplifier

high gain of IF amplifier

inadequate image frequency rejection

all of the above

⇒ The word enhancement mode is associated with

tunnel diode

MOSFET

JFET

photo diode

⇒ An RLC series circuit has R = 7.07 Ω, L = .707 H and C = 7.07 μF. At Half power frequencies the circuit impedance is likely to be

7.07 Ω

10 Ω

14.14 Ω

20 Ω

⇒ The numerical value of directive gain may lie between

1 and + 1

0 and 1

0 and ∞

1 and ∞

⇒ An 8 bit DAC has a full scale output of 2 mA and full scale error of ± 0.5%. If input is 10000000 the range of outputs is

994 to 1014 μA

990 to 1020 μA

800 to 1200 μA

none of the above

⇒ A Varactor diode has

a fixed capacitance

a fixed inductance

a voltage variable capacitance

a current variable inductance

⇒ A cycloconverter for single phase operation has

one positive group and one negative group converters

two positive group and two negative group converters

three positive group and three negative group converters

any of the above

⇒ Circular polarized waves result when

magnitudes are the same

phases are the same

magnitudes are same and phase difference is 90°

magnitudes are same and phase difference is zero

⇒ In the circuit, S was initially open. At time

*t*= 0, S is closed. When the current through the inductor is 6 A, the rate of change of current through the resistor is 6 A/s. The value of the inductor woul

1 H

2 H

3 H

4 H

⇒ In a NAND SR latch S = 0, R = 1 then

Q = 0

Q = 1, Q = 0

it is race condition

none of the above

⇒ The output of a linear system for any input can be computed in which of the following ways?

Only by summation of inpulse response by convolution integral

Only by summation of step response by superposition integral

Neither a nor b

Either (a) or (b)

⇒ Radio broadcasting is a familiar example of

space multiplexing

time multiplexing

frequency multiplexing

none of the above

⇒ In a turnstile antenna the crossed dipoles are excited with voltages

in phase with each other

90° out of phase with each other

120° out of phase with each other

180° out of phase with each other