Physics Electronics Online Mcqs Test

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Question 1

1. When n-p-n transistor is used as an amplifier

Answer

Holes move from base to emitter

Answer

Holes move from emitter be base

Answer

Holes move from emitter to base

Answer

Electrons move from base to collector

Question 2

2. When the conductivity of a semiconductor is only due, to breaking of covalent bonds, the semiconductor is called

Question 3

3. With negative feedback, the returning signal:

Answer

Opposes the input signal

Answer

Is proportional to differential voltage gain

Answer

Aids the input signal

Answer

Is proportional to output current

Question 4

4. NAND gate is

Answer

A basic gate

Answer

A basic universal gate

Answer

Not a universal gate

Answer

A universal gate

Question 5

5. In junction diode, the holes are because of:

Answer

Missing electrons

Answer

Extra electrons

Question 6

6. In the transistor schematic symbol, the arrow

Answer

Is locate on the collector

Answer

Is located on the emitter

Answer

Is located on the base

Answer

Point from north to south

Question 7

7. In the middle of the depletion layer of a reverse-biased p-n junction, the

Answer

Potential is maximum

Answer

Electric field is maximum

Answer

Electric field is zero

Answer

Potential is zero

Question 8

8. When n-p-n transistor is used as an amplifier,

Answer

Holes move from emitter to base

Answer

Electrons move from base to collector

Answer

Holes move from base to emitter

Answer

Holes move from emitter to base

Question 9

9. The positive sign of gain indicates that

Answer

May be in phase or not

Answer

Input and out signals are in phase

Answer

None of these

Answer

Input and out signals are not in phase

Question 10

10. When arsenic is added as an impurity to silicon, the resulting material is

Answer

N-type conductor

Answer

N-type semiconductor

Answer

P-type semiconductor

Answer

None of these

Question 11

11. In Germanium crystal, impurity donor elements have valiancy

Question 12

12. Non-inverting amplifier circuits have

Answer

A low output impedance

Answer

None of these

Answer

A very low input impedance

Answer

A very high input impedance

Question 13

13. Symbol represents

Question 14

14. A piece of copper and another of germanium are cooled from room temperature to 77 K, the resistance of

Answer

Each of them increases

Answer

Copper decreases and germanium increases

Answer

Copper increases and germanium decreases

Answer

Each of them decreases

Question 15

15. In a semiconductor, the mobility of holes is

Answer

Greater than electrons

Answer

Equal to electrons

Answer

Less than electrons

Question 16

16. In insulators

Answer

Valence band is partially filled with electrons

Answer

Conduction band is empty and valence band is filled with electrons

Answer

Conduction band is filled with electrons and valence band is empty

Answer

Conduction band is partially filled with electrons

Question 17

17. In a n-p-n transistor:

Answer

Holes move from base to collector

Answer

Negative charge moves from collector to base

Answer

Negative charge moves from emitter to base

Answer

Holes move from emitter to base

Question 18

18. Polythene, potystrene and nylon are examples of

Answer

Glassy solids

Answer

Crystalline solids

Answer

Amorphous solids

Answer

Polymeric solids

Question 19

19. An OP-AMP comparator is a circuit that compares the signal voltage on one of its inputs with a _

Answer

Reference voltage on the other

Answer

Non-inverting voltage at output

Answer

Virtual input

Question 20

20. The forward resistance of the diode is

Answer

None of these

Question 21

21. The least doped region in a transistor is

Question 22

22. Acceptor and donor impurities donate

Answer

n-carriers and p-carriers respectively

Answer

n-carriers only

Answer

p-carriers only

Answer

p-carriers and n-carriers respectively

Question 23

23. In semiconductors at a room temperature

Answer

The valence band is completely filled

Answer

The valence band is completely filled and the conduction band is partially filled

Answer

The valence band is partially empty and the conduction band is partially filled

Answer

The conduction band is completely empty

Question 24

24. The electrons in the outermost shell of an atom are called

Answer

Tightly bound electrons

Answer

Free electrons

Answer

None of these

Answer

Valence electrons

Question 25

25. The transistor provide good power amplification when they are used in

Answer

None of these

Answer

Common collector configuration

Answer

Common emitter configuration

Answer

Common base configuration

Question 26

26. The energy gap between conduction band and valence band is order 0.07 eV. It is a

Answer

Semiconductor

Question 27

27. Which logic gate is represented by following diagram?

Question 28

28. To use a transistor as an amplifier

Answer

The emitter base junction is forward biased and the base collector junction is reverse biased

Answer

Both junctions are reverse biased

Answer

No bias voltages are required

Answer

Both junctions are forward biased

Question 29

29. A diode as a rectifier converts:

Answer

High voltage to low voltage

Answer

D.C. into A.C.

Answer

Low voltage to high voltage

Answer

A.C. into D.C.

Question 30

30. In a P-type semiconductor

Answer

Major current carriers are mobile negative ions

Answer

Major current carriers are electrons

Answer

Major current carriers are mobile holes

Answer

The no. of mobile holes exceeds the no. of mobile acceptors

Question 31

31. When the output of OR gate is 1

Answer

If either or both inputs are 1

Answer

If either input is zero

Answer

Only if both inputs are 1

Answer

If both inputs are zero

Question 32

32. n-type semiconductor if formed

Answer

When a Ge crystal is doped with an impurity containing 5 valence electrons

Answer

From pure Si crystal

Answer

From pure Ge crystal

Answer

When a Ge crystal is doped with an impurity containing 3 valence electrons

Question 33

33. In between two consecutive permissible energy bands, there is a range of energy states which cannot be occupied by electrons. These are called

Answer

Hidden energy states

Answer

Forbidden energy states

Answer

None of these

Answer

Band levels

Question 34

34. Young’s modulus for copper is

Answer

91 x 10 Nm¯²

Answer

None of these

Answer

110 Nm¯²

Answer

70 x 10 Nm¯²

Question 35

35. Conversion of low input a.c. into high output a.c. is called:

Answer

All of these

Answer

Magnification

Answer

Rectification

Answer

Amplification

Question 36

36. When Ge crystal is doped with phosphorus atom, then it becomes

Answer

Superconductor

Question 37

37. Two inputs of NAND gates are shorted. This gate is equivalent to

Question 38

38. The measure of deformation of a solid when stress is applied to it is called

Answer

None of these

Question 39

39. A junction between p-type material and n-type material is called as

Answer

Transistor

Question 40

40. A NAND gate has:

Answer

HIGH inputs and a HIGH output

Answer

LOW inputs and a HIGH output

Answer

None of these

Answer

LOW inputs and a LOW output

Question 41

41. The width of a depletion layer in a p-n junction is

Answer

Increased by forward biasing

Answer

Is independent of voltage

Answer

Increased by reverse biasing

Answer

Decreased by reverse biasing

Question 42

42. The width of a depletion layer in a p-n junction is

Answer

Decreased by reverse biasing

Answer

Increased by forward biasing

Answer

Increased by reverse biasing

Answer

Is independent of voltage

Question 43

43. The part of a transistor which is heavily doped to produce large number of majority carriers is

Answer

Any of the above depending on nature of transistor

Question 44

44. Which is normal used of transistor?

Answer

P-type material

Answer

Switching device

Question 45

45. In a PN junction

Answer

P and N both are at same potential

Answer

High potential at P side and low potential at N side

Answer

Undetermined

Answer

High potential at N side and low potential at P side

Question 46

46. Which one is reverse-biased?

Question 47

47. When NPN transistor is used as an amplifier

Answer

Electrons move from emitter to base

Answer

Holes move from base to emitter

Answer

Electrons move from base to emitter

Answer

Electrons move from collector to base

Question 48

48. In n-type substances, the minority carriers are

Answer

None of these

Question 49

49. The device or circuit used for conversion of A.C. into D.C. is called

Answer

Filtering circuit

Answer

An amplifier

Answer

A rectifier

Question 50

50. The thickness of the base is equal to

Answer

Mean of thickness of emitter and collector

Answer

Thickness of collector

Answer

Thickness of emitter

Answer

Very small as compared to the thickness of emitter and collector

Question 51

51. Electrons present in p-type material due to thermal pair generation are

Answer

Minority carriers

Answer

Dual carriers

Answer

Majority carriers

Question 52

52. In half wave rectification

Answer

Only half cycle is used

Answer

None of these

Answer

Current flows in one directions

Answer

Current flows in pulses

Question 53

53. A diode as a rectifier converts:

Answer

A.C. into D.C.

Answer

High voltage to low voltage

Answer

Low voltage to high voltage

Answer

D.C. into A.C.

Question 54

54. The logic gate that will have HIGH or “1” at its output when any one of its input if HIGH is a(n):

Question 55

55. The energy band gap is maximum in

Answer

Superconductors

Answer

Semiconductors

Answer

Insulators

Question 56

56. In a P-type semiconductor

Answer

Major current carriers are electrons

Answer

Major current carriers are mobile holes

Answer

The no. of mobile holes exceeds the no. of mobile acceptors

Answer

Major current carriers are mobile negative ions

Question 57

57. Depletion region of a junction is formed

Answer

Under forward bias

Answer

When temperature varies

Answer

During the manufacturing process

Answer

Under reverse bias

Question 58

58. Semi-conductors with donor atoms and free electrons belong to the type

Answer

any of above

Question 59

59. Photodiode is used for

Answer

Detection of light

Answer

None of these

Answer

Emission of light

Answer

Light display

Question 60

60. An OP-AMPs can amplify

Answer

None of these

Answer

Both A.C. & D.C.

Question 61

61. In comma emitter amplifier (l₀/lE) = 0.98, then current gain is

Question 62

62. Reverse bias applied on a junction diode

Answer

Lowers the potential barrier

Answer

Raises the potential barrier

Answer

Increases the majority carrier current

Answer

Increase the minority carrier current

Question 63

63. The simplest type of rectification known as half wave rectification is obtained by

Answer

Suppressing the harmonics in A.C voltage

Answer

Using a transistor

Answer

Suppressing half wave of A.C supply by using diode

Answer

Using a Coolidge tube

Question 64

64. N-type crystal is

Answer

None of these

Answer

Positively charged

Answer

Negative charged

Answer 185

Electric generations

Answer 186

Transformers

Answer 187

Electric motors

Answer 188

Three PN-junctions

Answer 189

Four PN-junctions

Answer 190

Two PN-junctions

Answer 191

One PN-junction

Answer 192

Charged region

Answer 193

Depletion region

Answer 194

None of these

Answer 195

Diffusion region

Answer 196

p-type semiconductor

Answer 197

n-type semiconductor

Answer 198

p-type conductor

Answer 199

n-type conductor

Answer 200

90° Phase shift

Answer 201

No Phase shift

Answer 202

180° Phase shift

Answer 203

120° Phase shift

Answer 204

Resistance of both increases

Answer 205

Resistance of both decreases

Answer 206

Resistance of copper decreases while that of germanium increases

Answer 207

Resistance of copper increases while that of germanium decreases

Answer 208

Phosphorus

Answer 209

None of these

Answer 210

Voltage gain

Answer 211

Input resistance

Answer 212

Current gain

Answer 213

None of these

Answer 214

It offers a very low open loop gain all of above

Answer 215

It offers a very low output resistance

Answer 216

It offers a very high inputs resistance to the input current

Answer 217

may be p-type or n-type

Answer 218

None of these

Answer 219

Multivibrator

Answer 220

Oscillator

Answer 221

Increase the minority carrier current

Answer 222

Increase the majority carrier current

Answer 223

Lowers the potential barrier

Answer 224

Raises the potential barrier

Answer 225

All inputs are LOW

Answer 226

At least one input is LOW

Answer 227

All inputs are HIGH

Answer 228

At least one input is HIGH

Answer 229

Holes move from base to collector

Answer 230

Holes move from emitter to base

Answer 231

Negative charge moves from emitter to base

Answer 232

Negative charge moves from collector to base

Answer 233

Electric field is maximum

Answer 234

Potential is maximum

Answer 235

Electric field is zero

Answer 236

Potential is zero

Answer 237

Low degree radiations

Answer 238

Low degree resistor

Answer 239

Light dependent resistance

Answer 240

None of these

Answer 241

None of these

Answer 242

Resistor is used

Answer 243

Solvent is used

Answer 244

Capacitor is used

Answer 245

Phosphorus

Answer 246

Less than one

Answer 247

Equal to one

Answer 248

Greater than one

Answer 249

Works efficiently

Answer 250

None of these

Answer 251

Require more current

Answer 252

Bulk modulus

Answer 253

Young’s modulus

Answer 254

Shear modulus

Answer 255

None of these

Answer 256

10¯⁶ cm

Answer 257

10¯¹² cm

Answer 258

Can be any of the above three

Answer 259

None of these

Answer 260

Oscillator

Answer 261

Either emitter or collector

Answer 262

Remains same

Answer 263

Copper increases and germanium decreases

Answer 264

Each of them decreases

Answer 265

Each of them increases

Answer 266

Copper decreases and germanium increases

Answer 267

Can be any of the above three

Answer 268

None of these

Answer 269

Semiconductor

Answer 270

Conduction band is empty and valence band is filled with electrons

Answer 271

Conduction band is filled with electrons and valence bad is empty

Answer 272

Valence band is partially filled with electrons

Answer 273

Conduction band is partially filled with electrons

Answer 274

None of these

Answer 275

Holes and electrons

Answer 276

Electrons and holes

Answer 277

Electrons and protons

Answer 278

Protons and electrons

Answer 279

Full wave rectifier

Answer 280

Half wave rectifier

Answer 281

None of these

Answer 282

Semiconductor

Answer 283

Superconductor

Answer 284

Pentavalent

Answer 285

Tetravalent

Answer 286

Number of electrons increases while that of holes decreases

Answer 287

Number of electrons and holes remains same

Answer 288

Number of holes increases while that of holes decreases

Answer 289

Number of electrons and holes increases equally

Answer 290

Suddenly increases

Answer 291

Increases slowly

Answer 292

Remain fixed

Answer 293

Decreases slowly

Answer 294

Diffusion of charges

Answer 295

Drift of charges

Answer 296

Depends upon the nature of material

Answer 297

Both drift and diffusion of charges

Answer 298

P-type material

Answer 299

Super conductor

Answer 300

Semiconductor

Answer 301

N-type material

Answer 302

Zero amplitude

Answer 303

Unit amplitude

Answer 304

Constant amplitude

Answer 305

Variable amplitude

Answer 306

Almost zero

Answer 307

None of these

Answer 308

Enable it to Telerate higher voltage

Answer 309

Increases its electrical conductivity

Answer 310

Increase its life

Answer 311

Increase its electrical resistivity

Answer 312

Missing of electrons

Answer 313

Extra electrons

Answer 314

Greater than emitter current

Answer 315

Equal to emitter current

Answer 316

Slightly less than emitter current

Answer 317

Any of above

Answer 318

Superconductors

Answer 319

Insulators

Answer 320

Semiconductors

Answer 321

Oscillator

Answer 322

Logic gates

Answer 323

None of these

Answer 324

Shear stress

Answer 325

Compress ional stress

Answer 326

Tensile stress

Answer 327

Phosphorus

Answer 328

Phosphorus

Answer 329

None of these

Answer 330

Step up transformer

Answer 331

Triode vacuum tube

Answer 332

Three diodes in common

Answer 333

Step down transformer

Answer 334

p-type conductor

Answer 335

p-type semiconductor

Answer 336

n-type semiconductor

Answer 337

n-type conductor

Answer 338

The valence band is completely filled

Answer 339

The valence band is partially empty and the conduction band is partially filled

Answer 340

The conduction band is completely empty

Answer 341

The valence band is completely filled and the conduction band is partially filled

Answer 342

Reversed biased

Answer 343

Zero biased

Answer 344

None of these

Answer 345

Forward biased

Answer 346

None of these

Answer 347

None of these

Answer 348

Young’s modulus

Answer 349

Modulus of electricity

Answer 350

Bulk’s modulus

Answer 351

Major carrier is mobile holes

Answer 352

Major carrier is mobile negative ions

Answer 353

Major current carrier is electrons

Answer 354

The number of mobile holes exceeds the number of acceptors

Answer 355

NAND gates

Answer 356

n-type semiconductor

Answer 357

p-type semiconductor

Answer 358

p-type conductor

Answer 359

n-type conductor

Answer 360

The switch

Answer 361

Solar cells

Answer 362

The light emitting diode

Answer 363

The photo diodes

Answer 364

Remains constant

Answer 365

First A and B

Answer 366

Remains unchanged

Answer 367

Decreases and then increases

Answer 368

Insulators

Answer 369

Conductors

Answer 370

Superconductors

Answer 371

Semiconductors

Answer 372

Increases the majority carrier current

Answer 373

Increase the minority carrier current

Answer 374

Lowers the potential barrier

Answer 375

Raises the potential barrier

Answer 376

Diode is forward based

Answer 377

Potential barrier in depletion layer increases

Answer 378

Diode is reverse biased

Answer 379

Potential barrier in depletion layer remains unchanged

Answer 380

Forward biases

Answer 381

Reverse biased

Answer 382

None of these

Answer 383

Both are at the same potential

Answer 384

Inverting terminal is at high potential

Answer 385

Non-inverting terminal is at high potential

Answer 386

Both are at the high potential

Answer 387

Logic gates

Answer 388

Oscillator

Answer 389

Remains unchanged

Answer 390

Decreases and then increases

Answer 391

Off switch

Answer 392

It has low resistance to the current flow when forward biased & high resistance when reverse biased

Answer 393

It has high resistance to the current flow when reverse biased

Answer 394

Its conductivity increases with rise of temperature

Answer 395

It has low resistance to the current flow when forward biased

Answer 396

Several mega ohms

Answer 397

Free electrons in n-type and p-type

Answer 398

Free electrons in n-type and holes in p-type

Answer 399

Holes in n-type and p-type

Answer 400

Holes in n-type and free electrons in p-type

Answer 401

All of these

Answer 402

Crystal lattice

Answer 403

Any of above

Answer 404

Chemical energy

Answer 405

Light energy

Answer 406

Heat energy

Answer 407

None of these

Answer 408

None of these

Answer 409

Forward bias

Answer 410

Diode design

Answer 411

Doping density

Answer 412

Temperature

Answer 413

Large number of free electrons and few holes

Answer 414

Large number of holes and electrons

Answer 415

Equal number of free electrons and holes

Answer 416

Large number of holes and few electrons

Answer 417

Mobile ions

Answer 418

Immobile ions

Answer 419

Oscillator

Answer 420

Electromagnetic Waves

Answer 421

Gamma Rays

Answer 422

Transverse Waves

Answer 423

Large number of holes and few electrons

Answer 424

Large number of free electrons and few holes

Answer 425

Large number of holes and electrons

Answer 426

Equal number of free electrons and holes

Answer 427

Potential barrier is reduced to zero

Answer 428

Reverse bias exceeds certain value

Answer 429

Forward bias exceeds certain value

Answer 430

Forward current exceeds certain value

Answer 431

That the base be heated

Answer 432

That the collector be heated

Answer 433

None of these

Answer 434

That the emitter be heated

Answer 435

All of above

Answer 436

All of these

Answer 437

Diode is neutralized

Answer 438

Diode is reverse biased

Answer 439

None of these

Answer 440

Diode is forward biased

Answer 441

Missing electrons

Answer 442

Extra electrons

Answer 443

None of these

Answer 444

In forward bias

Answer 445

In reverse bias

Answer 446

None of these

Answer 447

Logic gates

Answer 448

Automatic switching

Answer 449

Detection of visible and invisible radiations

Answer 450

None of these

Answer 451

Almost negligible

Answer 452

Man hundred

Answer 453

None of these

Answer 454

Increase its electrical conductivity

Answer 455

Increase its electrical resistivity

Answer 456

Enable it to Telerate higher voltage

Answer 457

Increase its life

Answer 458

Microsecond

Answer 459

Nanosecond

Answer 460

None of these

Answer 461

Millisecond

Answer 462

OR gates only

Answer 463

AND gates and NOT gates

Answer 464

Or gates and NOT gates

Answer 465

AND gates, OR gates, and NOT gates

Answer 466

INVERTER gate

Answer 467

Comparator

Answer 468

Collector is positive and emitter is negative with respect to the base

Answer 469

Both collector and emitter are negative with respect to the base

Answer 470

Collector is positive and emitter is at negative potential as the base

Answer 471

Both collector and emitter are positive with respect to the base

Answer 472

Oscillator

Answer 473

P-type material

Total Questions:	177
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Total Marks:	177
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