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Assertion (A): The equation D = ∈_{0}∈_{r}E is applicable only to isotropic materials. Reason (R): In polycrystalline materials, the directional effects are absent. | |
A. | Both A and R are true and R is correct explanation of A [Wrong Answer] |
B. | Both A and R are true but R is not correct explanation of A [Correct Answer] |
C. | A is true but R is false [Wrong Answer] |
D. | A is false but R is true [Wrong Answer] |
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Explanation:-
Answer : B Discuss it below : !! OOPS Login [Click here] is required to post your answer/result |
Also Read Similar Questions Below :
⇒ Consider the following state
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1 and 2
2 only
3 only
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R S flip-flop
T flip-flop
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the towers or masts which are used as radiators
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⇒ Consider the sequence x(n) whose fourier transform X(e^{jω}) is depicted for - p ≤ ω ≤ p as shown in fig
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J K flip-flop
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⇒ Triatics are
small height antenna directly mounted on jeeps, ships, etc.
the towers or masts which are used as radiators
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⇒ Decimal 43 in hexadecimal and BCD number system is respectively.
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increases with frequency
decreases with frequency
remains unaltered
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⇒ Which of these commutation methods uses an external pulse for commutation?
Class A
Class C
Class E
Class F
⇒ When p-n junction is reverse biased the holes in p material move towards the junction and electrons in n material move away from the junction.
TRUE
FALSE
⇒ The common-drain amplifier, better known as the source follower, has a voltage gain __________ and the output signal is __________ with the input signal.
approaching unity, in phase
approaching unity, out of phase
is very high, in phase
is very high, in reverse phase
⇒ The discrete time system describes by y(n) = x(n^{2}) is
casual, Linear, time varying
casual, non-linear, timevari
non-casual, Linear, time invariant
non-casual, non-linear, time variant
⇒ Which of the following is used to obtain output position in a position control system?
Strain gauge
Load cell
Synchro
Thermistor
⇒ The law J = σE, where J is current density, σ is electrical conductivity and E is field strength is
Ohm's law
Gauss law
Ampere's law
Biot-Savart law
⇒ When cells are connected in series, emfs of all cells must be equal.
TRUE
FALSE
⇒ An antisymmetric filter having odd number of coefficient may have a performance as
low pass
high pass
band pass
all pass
⇒ As per Hall effect, if any specimen carrying a current I is applied in a transverse magnetic field B, then an electric field E is induced in the specimen in the direction.
parallel to I
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perpendicular to both I and B
⇒ A variable resistance R and capacitive reactance X_{C} are fed by an voltage. The current locus is
a semi circle in 4th quadrant
a semi circle in first quadrant
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1
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⇒
Match the following:
Microwave Measuring Instruments | Measurements Effected | ||
---|---|---|---|
A. | Bolometer | 1. | Reflection coefficients |
B. | VSWR meter | 2. | Half power beam widths |
C. | Cavity wave meter | 3. | Microwave power |
D. | Pattern recorder | 4. | Microwave frequency |
A-2, B-1, C-4, D-3
A-3, B-1, C-4, D-2
A-2, B-4, C-1, D-3
A-3, B-4, C-1, D-2
⇒ In forward active region, the operation of a BJT
both junctions are forward biased
both junctions are reverse biased
emitter base junction is forward biased and base collector junction is reverse biased
emitter base junction is reverse biased and base collector junction is reverse biased
⇒ For a push pull circuit the most favoured biasing method is
self bias
emitter bias
diode bias
collector bias
⇒ The Central Processing Unit (CPU) of the 16-processor system developed by hardware and software teams of C-DOT, Bangalore is configured around
Motorola 68020
Motorola 68040
Intel 80386
Intel 80486
⇒ In a single phase full wave regulator feeding an R-L load, the power factor angle of load is θ. The range of control of firing angle a is
0 ≤ a ≤ p
θ ≤ a ≤ p
0 ≤ a ≤ (p - θ)
θ ≤ a ≤ (p + θ)
⇒ Current in a 2H inductance in 10e^{-t} A. Admittance of the inductor is
-0.5 mho
0.5 mho
5 mho
10 mho
⇒ Which statement is true for an ac circuit?
Active power is always less than apparent power
Active power cannot be more than apparent power
Active power is always more than reactive power
Active power cannot be more than reactive power
⇒ The work function of a photo surface whose threshold wave length is 1200 A, will be
0.103 eV
0.673 eV
1.03 eV
1.27 eV
⇒ In a piezoelectric crystal, the application of mechanical force will cause
plastic deformation of crystal
magnetic dipoles in the crystal
electrical polarization in the crystal
shift in Fermi level
⇒ Which of the following statement is incorrect?
UJT is a 3-terminal diode having two unequally doped regions
A UJT can be triggered by any one of its three terminals
The bi-directional switching characteristics of a diac are symmetrical
As compared to JFETs, MOSFETs generate less noise in high gain amplifiers
⇒ The number of branches of root locus plot is equal to
the number of roots of characteristic equation
double the number of roots of characteristic equation
the number of roots of characteristic equation minus one
the number of roots of characteristic equation plus one
⇒ The log magnitude curve for a constant gain K is a horizontal straight line at a magnitude 20 log K dB.
TRUE
FALSE