Physics Electronics Online Mcqs Test

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Question 1

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

Answer

None of these

Answer

Forbidden energy states

Answer

Hidden energy states

Answer

Band levels

Question 2

2. Polythene, potystrene and nylon are examples of

Answer

Glassy solids

Answer

Crystalline solids

Answer

Polymeric solids

Answer

Amorphous solids

Question 3

3. 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 4

4. The gain A of the amplifier is of the order of

Answer

None of these

Answer

Man hundred

Question 5

5. Output voltage in full wave rectification is not smooth. In order to have smooth output voltage

Answer

Resistor is used

Answer

Capacitor is used

Answer

None of these

Answer

Solvent is used

Question 6

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

Answer

Holes move from base to emitter

Answer

Holes move from emitter to base

Answer

Holes move from emitter to base

Answer

Electrons move from base to collector

Question 7

7. The ratio of applied stress to volumetric strain is called

Answer

Bulk modulus

Answer

Young’s modulus

Answer

Shear modulus

Answer

None of these

Question 8

8. N-type crystal is

Answer

None of these

Answer

Negative charged

Answer

Positively charged

Question 9

9. A photodiode can turn its current ON and OFF in

Answer

Nanosecond

Answer

Microsecond

Answer

None of these

Answer

Millisecond

Question 10

10. Radio waves of constant amplitude can be generated with

Answer

Oscillator

Question 11

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

Question 12

12. In a semiconductor, the mobility of holes is

Answer

Less than electrons

Answer

Equal to electrons

Answer

Greater than electrons

Question 13

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

Question 14

14. Semi-conductor germanium and silicon are

Answer

Pentavalent

Answer

Tetravalent

Question 15

15. To use a transistor as an amplifier

Answer

Both junctions are reverse biased

Answer

No bias voltages are required

Answer

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

Answer

Both junctions are forward biased

Question 16

16. Reverse bias applied on a junction diode

Answer

Increases the majority carrier current

Answer

Lowers the potential barrier

Answer

Raises the potential barrier

Answer

Increase the minority carrier current

Question 17

17. The forward resistance of the diode is

Answer

None of these

Question 18

18. At room temperature, a p-type semi-conductor has

Answer

Equal number of free electrons and holes

Answer

Large number of holes and electrons

Answer

Large number of free electrons and few holes

Answer

Large number of holes and few electrons

Question 19

19. Which of the following is not characteristic of an op—amp

Answer

It offers a very low open loop gain all of above

Answer

It offers a very high inputs resistance to the input current

Answer

It offers a very low output resistance

Answer

None of these

Question 20

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

Answer

Each of them decreases

Answer

Each of them increases

Answer

Copper decreases and germanium increases

Answer

Copper increases and germanium decreases

Question 21

21. The whole structure obtained by the repetition of unit cell is known as

Answer

Crystal lattice

Answer

All of these

Question 22

22. Photodiode is used for

Answer

None of these

Answer

Emission of light

Answer

Light display

Answer

Detection of light

Question 23

23. At absolute zero, Si acts as

Answer

None of these

Question 24

24. The basic logic gate whose output is the complement of the input is the:

Answer

Comparator

Answer

INVERTER gate

Question 25

25. The electrical circuit used to have smooth DC output from a rectifier circuit is called

Answer

Logic gates

Answer

Oscillator

Question 26

26. In the p-type semi-conductor the majority and minority charge carriers are respectively

Answer

Protons and electrons

Answer

Electrons and protons

Answer

Electrons and holes

Answer

Holes and electrons

Question 27

27. Application of photodiode is/are

Answer

Logic gates

Answer

None of these

Answer

Automatic switching

Answer

Detection of visible and invisible radiations

Question 28

28. The especially designed semiconductor diodes used as indicator lamps in electronic circuits are

Answer

The switch

Answer

The light emitting diode

Answer

Solar cells

Answer

The photo diodes

Question 29

29. Which one is forward bias?

Question 30

30. In a p-type semiconductor germanium is doped with:

Answer

All of these

Question 31

31. In semiconductors at a room temperature

Answer

The conduction band is completely empty

Answer

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

Answer

The valence band is completely filled

Answer

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

Question 32

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

Answer

Extra electrons

Answer

Missing electrons

Question 33

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

Answer

None of these

Question 34

34. Diode can work as

Answer

Multivibrator

Answer

Oscillator

Question 35

35. In p – n junction, after diffusion, a charge less region is formed around the junction is called

Answer

Diffusion region

Answer

Charged region

Answer

None of these

Answer

Depletion region

Question 36

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

Answer

Copper decreases and germanium increases

Answer

Each of them increases

Answer

Copper increases and germanium decreases

Answer

Each of them decreases

Question 37

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

Answer

Transistor

Question 38

38. 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 39

39. Non-inverting amplifier circuits have

Answer

A very low input impedance

Answer

None of these

Answer

A low output impedance

Answer

A very high input impedance

Question 40

40. Depletion layer consists of

Answer

Mobile ions

Answer

Immobile ions

Question 41

41. The materials in which valence band and conduction band overlap are called

Answer

Superconductors

Answer

Insulators

Answer

Conductors

Answer

Semiconductors

Question 42

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

Answer

None of these

Question 43

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

Answer

Can be any of the above three

Question 44

44. The electrical circuit used to bet smooth DC output from a rectifier circuit is called

Answer

Oscillator

Answer

Logic gates

Question 45

45. The energy band gap is maximum in

Answer

Superconductors

Answer

Semiconductors

Answer

Insulators

Question 46

46. The thickness of the base is equal to

Answer

Thickness of collector

Answer

Mean of thickness of emitter and collector

Answer

Thickness of emitter

Answer

Very small as compared to the thickness of emitter and collector

Question 47

47. In forward bias the width of potential barrier

Answer

Remains same

Question 48

48. Which is normal used of transistor?

Answer

P-type material

Answer

Switching device

Question 49

49. When NPN transistor is used as an amplifier

Answer

Electrons move from emitter to base

Answer

Electrons move from collector to base

Answer

Electrons move from base to emitter

Answer

Holes move from base to emitter

Question 50

50. On increasing the reverse bias to a large value in a p-n junction diode current

Answer

Suddenly increases

Answer

Remain fixed

Answer

Increases slowly

Answer

Decreases slowly

Question 51

51. In p-n-p transistor the collector current is

Answer

Slightly less than emitter current

Answer

Equal to emitter current

Answer

Greater than emitter current

Answer

Any of above

Question 52

52. A diode as a rectifier converts:

Answer

Low voltage to high voltage

Answer

D.C. into A.C.

Answer

High voltage to low voltage

Answer

A.C. into D.C.

Question 53

53. When a semiconductor is continuously heated, then value of its resistance

Answer

Remains unchanged

Answer

Decreases and then increases

Question 54

54. Which of the following when added as an impurity into the silicon produces n-type semi-conductor?

Question 55

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

Answer

Electrons move from base to collector

Answer

Holes move from emitter to base

Answer

Holes move from base to emitter

Answer

Holes move from emitter be base

Question 56

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

Answer

Can be any of the above three

Question 57

57. 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 58

58. Transistor can be used as

Answer

Half wave rectifier

Answer

Full wave rectifier

Question 59

59. A n-p-n transistor conducts when

Answer

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

Answer

Both collector and emitter are positive with respect to the base

Answer

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

Answer

Both collector and emitter are negative with respect to the base

Question 60

60. The electromagnetic waves emitted by the LC circuit of areal to a transmitting station are of

Answer

Zero amplitude

Answer

Unit amplitude

Answer

Variable amplitude

Answer

Constant amplitude

Question 61

61. In a p-type semiconductor germanium is doped with:

Answer

All of above

Question 62

62. In Germanium crystal, impurity donor elements have valiancy

Question 63

63. In forward bias, the width of potential barrier in a p-n junction diode

Answer

First A and B

Answer

Remains constant

Question 64

64. The number of junctions in the PNP transistor are

Answer 168

None of these

Answer 169

Common collector configuration

Answer 170

Common emitter configuration

Answer 171

Common base configuration

Answer 172

None of these

Answer 173

Almost zero

Answer 174

P-type material

Answer 175

Super conductor

Answer 176

Semiconductor

Answer 177

N-type material

Answer 178

Reverse biased

Answer 179

None of these

Answer 180

Forward biases

Answer 181

Increase its life

Answer 182

Enable it to Telerate higher voltage

Answer 183

Increase its electrical resistivity

Answer 184

Increase its electrical conductivity

Answer 185

Missing of electrons

Answer 186

Extra electrons

Answer 187

Phosphorus

Answer 188

Electric field is zero

Answer 189

Potential is maximum

Answer 190

Electric field is maximum

Answer 191

Potential is zero

Answer 192

Decreases and then increases

Answer 193

Remains unchanged

Answer 194

Lowers the potential barrier

Answer 195

Increase the majority carrier current

Answer 196

Raises the potential barrier

Answer 197

Increase the minority carrier current

Answer 198

n-type semiconductor

Answer 199

n-type conductor

Answer 200

p-type conductor

Answer 201

p-type semiconductor

Answer 202

Only if both inputs are 1

Answer 203

If either or both inputs are 1

Answer 204

If either input is zero

Answer 205

If both inputs are zero

Answer 206

LOW inputs and a LOW output

Answer 207

HIGH inputs and a HIGH output

Answer 208

LOW inputs and a HIGH output

Answer 209

None of these

Answer 210

Diode design

Answer 211

Doping density

Answer 212

Temperature

Answer 213

Forward bias

Answer 214

Electric field is maximum

Answer 215

Electric field is zero

Answer 216

Potential is zero

Answer 217

Potential is maximum

Answer 218

n-type semiconductor

Answer 219

p-type conductor

Answer 220

p-type semiconductor

Answer 221

n-type conductor

Answer 222

Several mega ohms

Answer 223

High potential at N side and low potential at P side

Answer 224

P and N both are at same potential

Answer 225

High potential at P side and low potential at N side

Answer 226

Undetermined

Answer 227

Phosphorus

Answer 228

Phosphorus

Answer 229

Diode is neutralized

Answer 230

Diode is reverse biased

Answer 231

Diode is forward biased

Answer 232

None of these

Answer 233

Current gain

Answer 234

Input resistance

Answer 235

Voltage gain

Answer 236

None of these

Answer 237

At least one input is LOW

Answer 238

All inputs are LOW

Answer 239

All inputs are HIGH

Answer 240

At least one input is HIGH

Answer 241

Lowers the potential barrier

Answer 242

Increase the minority carrier current

Answer 243

Raises the potential barrier

Answer 244

Increases the majority carrier current

Answer 245

D.C. into A.C.

Answer 246

A.C. into D.C.

Answer 247

Low voltage to high voltage

Answer 248

High voltage to low voltage

Answer 249

Is locate on the collector

Answer 250

Point from north to south

Answer 251

Is located on the base

Answer 252

Is located on the emitter

Answer 253

any of above

Answer 254

Less than one

Answer 255

Greater than one

Answer 256

Equal to one

Answer 257

may be p-type or n-type

Answer 258

None of these

Answer 259

Depends upon the nature of material

Answer 260

Diffusion of charges

Answer 261

Drift of charges

Answer 262

Both drift and diffusion of charges

Answer 263

Non-inverting terminal is at high potential

Answer 264

Inverting terminal is at high potential

Answer 265

Both are at the same potential

Answer 266

Both are at the high potential

Answer 267

A basic gate

Answer 268

Not a universal gate

Answer 269

A universal gate

Answer 270

A basic universal gate

Answer 271

Negative charge moves from emitter to base

Answer 272

Negative charge moves from collector to base

Answer 273

Holes move from emitter to base

Answer 274

Holes move from base to collector

Answer 275

Triode vacuum tube

Answer 276

Step up transformer

Answer 277

Step down transformer

Answer 278

Three diodes in common

Answer 279

Increase its electrical resistivity

Answer 280

Enable it to Telerate higher voltage

Answer 281

Increases its electrical conductivity

Answer 282

Increase its life

Answer 283

Conduction band is partially filled with electrons

Answer 284

Conduction band is empty and valence band is filled with electrons

Answer 285

Valence band is partially filled with electrons

Answer 286

Conduction band is filled with electrons and valence bad is empty

Answer 287

Either emitter or collector

Answer 288

Both A.C. & D.C.

Answer 289

None of these

Answer 290

Missing electrons

Answer 291

Extra electrons

Answer 292

Any of above

Answer 293

Current flows in one directions

Answer 294

Only half cycle is used

Answer 295

Current flows in pulses

Answer 296

None of these

Answer 297

Transformers

Answer 298

Electric generations

Answer 299

Electric motors

Answer 300

Valence band is partially filled with electrons

Answer 301

Conduction band is empty and valence band is filled with electrons

Answer 302

Conduction band is partially filled with electrons

Answer 303

Conduction band is filled with electrons and valence band is empty

Answer 304

Resistance of copper increases while that of germanium decreases

Answer 305

Resistance of both increases

Answer 306

Resistance of both decreases

Answer 307

Resistance of copper decreases while that of germanium increases

Answer 308

It has high resistance to the current flow when reverse biased

Answer 309

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

Answer 310

Its conductivity increases with rise of temperature

Answer 311

It has low resistance to the current flow when forward biased

Answer 312

Light energy

Answer 313

Heat energy

Answer 314

None of these

Answer 315

Chemical energy

Answer 316

Four PN-junctions

Answer 317

One PN-junction

Answer 318

Three PN-junctions

Answer 319

Two PN-junctions

Answer 320

Rectification

Answer 321

Amplification

Answer 322

Magnification

Answer 323

All of these

Answer 324

Holes move from emitter to base

Answer 325

Negative charge moves from emitter to base

Answer 326

Negative charge moves from collector to base

Answer 327

Holes move from base to collector

Answer 328

P-type semiconductor

Answer 329

None of these

Answer 330

N-type semiconductor

Answer 331

N-type conductor

Answer 332

Increased by forward biasing

Answer 333

Decreased by reverse biasing

Answer 334

Increased by reverse biasing

Answer 335

Is independent of voltage

Answer 336

Phosphorus

Answer 337

Semiconductor

Answer 338

None of these

Answer 339

Superconductor

Answer 340

Free electrons

Answer 341

Tightly bound electrons

Answer 342

None of these

Answer 343

Valence electrons

Answer 344

Semiconductor

Answer 345

None of these

Answer 346

Oscillator

Answer 347

P-type material

Answer 348

Off switch

Answer 349

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

Answer 350

Free electrons in n-type and p-type

Answer 351

Holes in n-type and p-type

Answer 352

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

Answer 353

Require more current

Answer 354

None of these

Answer 355

Works efficiently

Answer 356

Young’s modulus

Answer 357

Bulk’s modulus

Answer 358

None of these

Answer 359

Modulus of electricity

Answer 360

None of these

Answer 361

None of these

Answer 362

Forward biased

Answer 363

Zero biased

Answer 364

Reversed biased

Answer 365

When temperature varies

Answer 366

Under forward bias

Answer 367

Under reverse bias

Answer 368

During the manufacturing process

Answer 369

The number of mobile holes exceeds the number of acceptors

Answer 370

Major carrier is mobile holes

Answer 371

Major carrier is mobile negative ions

Answer 372

Major current carrier is electrons

Answer 373

None of these

Answer 374

Shear stress

Answer 375

Tensile stress

Answer 376

Compress ional stress

Answer 377

NAND gates

Answer 378

Oscillator

Answer 379

None of these

Answer 380

Large number of free electrons and few holes

Answer 381

Large number of holes and electrons

Answer 382

Large number of holes and few electrons

Answer 383

Equal number of free electrons and holes

Answer 384

Increased by reverse biasing

Answer 385

Decreased by reverse biasing

Answer 386

Increased by forward biasing

Answer 387

Is independent of voltage

Answer 388

From pure Ge crystal

Answer 389

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

Answer 390

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

Answer 391

From pure Si crystal

Answer 392

A rectifier

Answer 393

An amplifier

Answer 394

Filtering circuit

Answer 395

Forward bias exceeds certain value

Answer 396

Reverse bias exceeds certain value

Answer 397

Forward current exceeds certain value

Answer 398

Potential barrier is reduced to zero

Answer 399

n-type conductor

Answer 400

p-type semiconductor

Answer 401

p-type conductor

Answer 402

n-type semiconductor

Answer 403

Minority carriers

Answer 404

Dual carriers

Answer 405

Majority carriers

Answer 406

Semiconductor

Answer 407

In reverse bias

Answer 408

In forward bias

Answer 409

None of these

Answer 410

Virtual input

Answer 411

Non-inverting voltage at output

Answer 412

Reference voltage on the other

Answer 413

None of these

Answer 414

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

Answer 415

Major current carriers are electrons

Answer 416

Major current carriers are mobile holes

Answer 417

Major current carriers are mobile negative ions

Answer 418

Is proportional to output current

Answer 419

Is proportional to differential voltage gain

Answer 420

Aids the input signal

Answer 421

Opposes the input signal

Answer 422

Superconductors

Answer 423

Insulators

Answer 424

Semiconductors

Answer 425

Using a transistor

Answer 426

Using a Coolidge tube

Answer 427

Suppressing half wave of A.C supply by using diode

Answer 428

Suppressing the harmonics in A.C voltage

Answer 429

Light dependent resistance

Answer 430

None of these

Answer 431

Low degree radiations

Answer 432

Low degree resistor

Answer 433

91 x 10 Nm¯²

Answer 434

None of these

Answer 435

110 Nm¯²

Answer 436

70 x 10 Nm¯²

Answer 437

None of these

Answer 438

Superconductor

Answer 439

Number of electrons and holes remains same

Answer 440

Number of holes increases while that of holes decreases

Answer 441

Number of electrons increases while that of holes decreases

Answer 442

Number of electrons and holes increases equally

Answer 443

Gamma Rays

Answer 444

Electromagnetic Waves

Answer 445

Transverse Waves

Answer 446

10¯⁶ cm

Answer 447

10¯¹² cm

Answer 448

The valence band is completely filled

Answer 449

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

Answer 450

The conduction band is completely empty

Answer 451

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

Answer 452

That the base be heated

Answer 453

None of these

Answer 454

That the emitter be heated

Answer 455

That the collector be heated

Answer 456

Almost negligible

Answer 457

None of these

Answer 458

90° Phase shift

Answer 459

No Phase shift

Answer 460

120° Phase shift

Answer 461

180° Phase shift

Answer 462

Diode is forward based

Answer 463

Potential barrier in depletion layer increases

Answer 464

Potential barrier in depletion layer remains unchanged

Answer 465

Diode is reverse biased

Answer 466

p-carriers and n-carriers respectively

Answer 467

n-carriers only

Answer 468

p-carriers only

Answer 469

n-carriers and p-carriers respectively

Answer 470

Or gates and NOT gates

Answer 471

AND gates, OR gates, and NOT gates

Answer 472

AND gates and NOT gates

Answer 473

OR gates only

Total Questions:	177
Time Allowed:	60 Minutes
Total Marks:	177
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