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Q1. | On the basis of the type of chemical bonds, solids may be classified into |

A. | ionic crystals [Wrong Answer] |

B. | ionic and valence crystals [Wrong Answer] |

C. | ionic crystal, valence crystals and metals [Wrong Answer] |

D. | ionic crystals, valence crystals, metal and vander wall crystals [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 of the following functions would have only odd powers of

*x*in its Taylor series expansion about the point

*x*= 0?

sin (

*x*

^{3})

sin (

*x*

^{2})

cos (

*x*

^{3})

cos (

*x*

^{2})

⇒ A Wien bridge is suitable for

audio frequencies only

radio frequencies only

both audio and radio frequencies

very low frequencies only

⇒ The Fourier transform of

*f*(

*t*) = cos ω

_{0}

*t*is

p[δω

_{0}+ δ(- ω

_{0})]

p[δ(ω - ω

_{0}) + δ(ω + ω

_{0})]

p[δω

_{0}- δ(- ω

_{0})]

p[δ(ω - ω

_{0}) - δ(ω + ω

_{0})]

⇒ In the circuit of figure, the load current when thyristor is

is constant

increases exponentially

decreases exponentially

zero

⇒ In a current transformers

the number of turns in primary and secondary windings are nearly equal

the number of primary turns is very small as compared to number of secondary turns.

the number of secondary turns is very small as compared to the number of primary turns

either (a) or (c).

⇒ When measuring phase angle between two waves using a CRO, the time base generator is connected to

X plate

Y plate

both X and Y plate

neither X nor Y plates

⇒ Ridge waveguide is essentially a form of capacitively loaded guide.

TRUE

FALSE

⇒ An angle modulated signal is given by

*s*(

*t*) = cos 2p (2 x 10

^{6}

*t*+ 30 sin 150

*t*+ 40 cos 150

*t*). The maximum frequency and phase deviations of

*s*(

*t*) are

10.5 kHz, 140p rad

6 kHz and 80p rad

10.5 kHz, 100p rad

7.5 kHz, 100p rad

⇒ In single phase half wave regulator, the average current over one full cycle

is always positive

may be positive or negative

may be negative

is always negative

⇒ Power diodes are generally

silicon diodes

germanium diodes

either of the above

none of the above

⇒ Which of the following instructions in 8085 does not belong to data transfer group?

`LDA addr`

`STA addr`

`XCHG`

`SUB r`

⇒ The energy to cause thermionic emission is supplied by heating the cathode.

TRUE

FALSE

⇒ For a 16 bit computer the range of integer constants in C is

-32768 to + 32767

-32767 to + 32768

-65536 to + 65535

-65535 to + 65536

⇒ The behaviour of a JFET is similar to that of

NPN transistor

PNP transistor

SCR

Vacuum triode

⇒ The radiation pattern of loop antenna is

circle

semicircle

elliptical

cardoid or Limacon

⇒ Fourier transform pair are

autocorrelation and power spectral density

autocorrelation and convoloution

convolution and power spectral density

autocorrelation and energy

⇒ Oscillator crystal is made of

silicon

germanium

diamond

quartz

⇒ The characteristics of which device has peak point and valley point

SCR

PUT

SCS

Shockley diode

⇒ DC amplifiers have a tendency to be unstable.

TRUE

FALSE

⇒ The scaling factor of an MOS device using constant voltage scaling model, the gate area of the device will be scaled as

1/a

1/a

^{2}

1/a

^{3}

1/a

^{4}

⇒ The output resistance of a microphone is 20 ohms. It is to feed a line of impedance 320 ohms. To ensure maximum power transfer, the turn ratio of transformer is

16

256

2

4

⇒ The velocity factor of a transmission line

mainly depends on the skin effect

is always higher for a solid dielectric than for air

mainly depends on the dielectric constant of the material used

increases the velocity along the transmission line

⇒ Instruction cycle is the time required to complete the execution of an instruction.

TRUE

FALSE

⇒ In a resistive ac circuit, the current __________ the voltage by __________ .

lags, 90°

lags, 45°

lags, 0°

leads 90°

⇒ AC hum is picked up from power cables

TRUE

FALSE

⇒ The Boolean function A + BC is reduced form of

AB + BC

AB + ABC

(A + B) (A + C)

(A + C)B

⇒ Which of the following logic no resistors are used?

CMOS

TTL

4 n sec ECL

8 sec ECL

⇒ For a binary half subtractor having two inputs

*A*and

*B*the correct sets of logical expressions for the outputs

*D*(

*A*-

*B*) and

*X*= Borrow are

D = AB + AB, X = AB

D = AB AB, X = AB

D = AB + AB, X = AB

D = AB + A B, X = AB

⇒ Which one of following is correct condition to check the stability of sysytem in terms of impulse response?

Σ(

*x*(

*n*)) < ∞

Σ

*x*(

*n*) < 0

Σ

*x*(

*n*) = 0

Σ

*x*(

*n*) = ∞

⇒ Two capacitors of 1 μF and 2 μF are connected in series across a 10 V dc battery. After the capacitors have been charged, the charges across the two capacitors will be

10 μC each

20 μC each

10 μC and 20 μC

20 μC and 10 μC