Physics Electronics Online Mcqs Test

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Question 1

1. In insulators

Answer

Conduction band is empty and valence band is filled with electrons

Answer

Conduction band is partially filled with electrons

Answer

Valence band is partially filled with electrons

Answer

Conduction band is filled with electrons and valence band is empty

Question 2

2. Using OP-Amp as an inverting amplifier, the non-inverting terminal has potential

Answer

None of these

Question 3

3. Due to the break down the p-n junction suffers

Answer

Require more current

Answer

Works efficiently

Answer

None of these

Question 4

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

Answer

Superconductor

Question 5

5. A n-p-n transistor conducts when

Answer

Both collector and emitter are negative with respect to the base

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

Question 6

6. Depletion region of a junction is formed

Answer

Under forward bias

Answer

When temperature varies

Answer

Under reverse bias

Answer

During the manufacturing process

Question 7

7. A device which converts an alternating current to direct current is called

Answer

P-type material

Answer

Oscillator

Question 8

8. A substance which have empty conduction band is called

Answer

Semiconductor

Answer

None of these

Question 9

9. A NAND gate has:

Answer

HIGH inputs and a HIGH output

Answer

LOW inputs and a LOW output

Answer

LOW inputs and a HIGH output

Answer

None of these

Question 10

10. 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 be base

Question 11

11. The potential difference across the depletion region of silicon is

Question 12

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

Answer

Forbidden energy states

Answer

Band levels

Answer

None of these

Answer

Hidden energy states

Question 13

13. When boron is added as an impurity to silicon, the resulting material is:

Answer

p-type semiconductor

Answer

p-type conductor

Answer

n-type conductor

Answer

n-type semiconductor

Question 14

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

Answer

Equal to emitter current

Answer

Any of above

Answer

Slightly less than emitter current

Answer

Greater than emitter current

Question 15

15. Arsenic, antimony or phosphorus are impurities of

Answer

may be p-type or n-type

Answer

None of these

Question 16

16. What input values will cause an AND logic gate to produce a HIGH output?

Answer

All inputs are HIGH

Answer

At least one input is LOW

Answer

At least one input is HIGH

Answer

All inputs are LOW

Question 17

17. In a P-type semiconductor

Answer

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

Answer

Major current carriers are mobile holes

Answer

Major current carriers are electrons

Answer

Major current carriers are mobile negative ions

Question 18

18. If a signal passing through a gate is inhibited by sending a low into one of the inputs, and the output is HIGH, the gate is a(n):

Question 19

19. Suitable impurities are added to a semiconductor depending on its use. This is due to:

Answer

Enable it to Telerate higher voltage

Answer

Increase its life

Answer

Increases its electrical conductivity

Answer

Increase its electrical resistivity

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

Copper decreases and germanium increases

Answer

Each of them increases

Answer

Copper increases and germanium decreases

Question 21

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

Answer

Suppressing the harmonics in A.C voltage

Answer

Suppressing half wave of A.C supply by using diode

Answer

Using a transistor

Answer

Using a Coolidge tube

Question 22

22. In a good conductor, the energy gap between the conduction band and the valence band is

Question 23

23. Acceptor and donor impurities donate

Answer

n-carriers only

Answer

p-carriers and n-carriers respectively

Answer

p-carriers only

Answer

n-carriers and p-carriers respectively

Question 24

24. A single transistor can be used to build which of the following digital logic gates?

Answer

NAND gates

Question 25

25. A diode as a rectifier converts:

Answer

A.C. into D.C.

Answer

D.C. into A.C.

Answer

Low voltage to high voltage

Answer

High voltage to low voltage

Question 26

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

Answer

Semiconductors

Answer

Conductors

Answer

Superconductors

Answer

Insulators

Question 27

27. Which is normal used of transistor?

Answer

P-type material

Answer

Switching device

Question 28

28. In a semiconductor, the mobility of holes is

Answer

Greater than electrons

Answer

Equal to electrons

Answer

Less than electrons

Question 29

29. 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

Virtual input

Answer

Non-inverting voltage at output

Question 30

30. Light emitting diode work when it is

Answer

None of these

Answer

Forward biases

Answer

Reverse biased

Question 31

31. In insulators

Answer

Valence band is partially filled with electrons

Answer

Conduction 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 bad is empty

Question 32

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

Answer

None of these

Question 33

33. In semiconductors at a room temperature

Answer

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

Answer

The valence band is completely filled

Answer

The conduction band is completely empty

Answer

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

Question 34

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

Answer

Is independent of voltage

Answer

Increased by reverse biasing

Answer

Increased by forward biasing

Answer

Decreased by reverse biasing

Question 35

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

Question 36

36. Young’s modulus for copper is

Answer

70 x 10 Nm¯²

Answer

None of these

Answer

110 Nm¯²

Answer

91 x 10 Nm¯²

Question 37

37. Suitable impurities are added to a semiconductor depending on its use. This is due to

Answer

Increase its electrical resistivity

Answer

Enable it to Telerate higher voltage

Answer

Increase its life

Answer

Increase its electrical conductivity

Question 38

38. Application of photodiode is/are

Answer

Automatic switching

Answer

Detection of visible and invisible radiations

Answer

Logic gates

Answer

None of these

Question 39

39. In reverse biasing of p-n junction, the resistance offered by the diode is of the order of

Answer

Several mega ohms

Question 40

40. The energy band gap is maximum in

Answer

Superconductors

Answer

Semiconductors

Answer

Insulators

Question 41

41. When n-type of semiconductor is heated,

Answer

Number of electrons and holes remains same

Answer

Number of electrons increases while that of holes decreases

Answer

Number of holes increases while that of holes decreases

Answer

Number of electrons and holes increases equally

Question 42

42. A signal applied at the non-inverting input, of an O.P that appears after amplification at the output terminal, with

Answer

90° Phase shift

Answer

180° Phase shift

Answer

120° Phase shift

Answer

No Phase shift

Question 43

43. Polythene, potystrene and nylon are examples of

Answer

Crystalline solids

Answer

Glassy solids

Answer

Amorphous solids

Answer

Polymeric solids

Question 44

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

Question 45

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

Answer

Comparator

Answer

INVERTER gate

Question 46

46. Copper and germanium are cooled to 70 K from room temperature, then

Answer

Resistance of copper decreases while that of germanium increases

Answer

Resistance of both increases

Answer

Resistance of copper increases while that of germanium decreases

Answer

Resistance of both decreases

Question 47

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

Answer

Charged region

Answer

None of these

Answer

Diffusion region

Answer

Depletion region

Question 48

48. 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 49

49. The ratio β represents

Question 50

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

Answer

Extra electrons

Answer

Missing electrons

Question 51

51. In n-p-n transistor, p works as

Answer

Any of above

Question 52

52. In p-type semiconductor

Answer

Major current carrier is electrons

Answer

Major carrier is mobile negative ions

Answer

Major carrier is mobile holes

Answer

The number of mobile holes exceeds the number of acceptors

Question 53

53. Reverse bias applied on a junction diode

Answer

Raises the potential barrier

Answer

Increases the majority carrier current

Answer

Increase the minority carrier current

Answer

Lowers the potential barrier

Question 54

54. 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 55

55. The impurity atoms with which a pure silicon should be doped to make a p-type semiconductor is

Answer

Phosphorus

Question 56

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

Answer

It offers a very high inputs resistance to the input current

Answer

It offers a very low output resistance

Answer

None of these

Answer

It offers a very low open loop gain all of above

Question 57

57. NAND gate is

Answer

A basic universal gate

Answer

Not a universal gate

Answer

A universal gate

Answer

A basic gate

Question 58

58. p-type crystal of a p-n junction diode is connected to a positive terminal of battery and n-type crystal connected to negative terminal of battery

Answer

Potential barrier in depletion layer remains unchanged

Answer

Potential barrier in depletion layer increases

Answer

Diode is reverse biased

Answer

Diode is forward based

Question 59

59. In a junction diode, the holes are due to

Answer

Extra electrons

Answer

Missing of electrons

Question 60

60. At absolute zero, Si acts as

Answer

None of these

Question 61

61. If on increasing temperature the resistance decreases, then it is

Answer

Superconductor

Answer

Semiconductor

Answer

None of these

Question 62

62. The least doped region in a transistor is

Question 63

63. Semi-conductor germanium and silicon are

Answer

Tetravalent

Answer

Pentavalent

Question 64

64. Due to high loop gain of the amplifier, the inverting and non-inverting inputs are

Answer

Inverting terminal is at high potential

Answer

Non-inverting terminal is at high potential

Answer

Both are at the high potential

Answer

Both are at the same potential

Answer 180

Holes move from base to collector

Answer 181

Negative charge moves from collector to base

Answer 182

Holes move from emitter to base

Answer 183

Negative charge moves from emitter to base

Answer 184

Diode is forward biased

Answer 185

Diode is reverse biased

Answer 186

Diode is neutralized

Answer 187

None of these

Answer 188

A very low input impedance

Answer 189

None of these

Answer 190

A low output impedance

Answer 191

A very high input impedance

Answer 192

None of these

Answer 193

Current gain

Answer 194

Voltage gain

Answer 195

Input resistance

Answer 196

Detection of light

Answer 197

None of these

Answer 198

Emission of light

Answer 199

Light display

Answer 200

If either input is zero

Answer 201

If either or both inputs are 1

Answer 202

Only if both inputs are 1

Answer 203

If both inputs are zero

Answer 204

None of these

Answer 205

Chemical energy

Answer 206

Heat energy

Answer 207

Light energy

Answer 208

Potential is maximum

Answer 209

Potential is zero

Answer 210

Electric field is maximum

Answer 211

Electric field is zero

Answer 212

D.C. into A.C.

Answer 213

High voltage to low voltage

Answer 214

A.C. into D.C.

Answer 215

Low voltage to high voltage

Answer 216

Potential is zero

Answer 217

Potential is maximum

Answer 218

Electric field is zero

Answer 219

Electric field is maximum

Answer 220

All of above

Answer 221

Unit amplitude

Answer 222

Variable amplitude

Answer 223

Zero amplitude

Answer 224

Constant amplitude

Answer 225

Either emitter or collector

Answer 226

Electrons and protons

Answer 227

Protons and electrons

Answer 228

Holes and electrons

Answer 229

Electrons and holes

Answer 230

Is proportional to output current

Answer 231

Opposes the input signal

Answer 232

Aids the input signal

Answer 233

Is proportional to differential voltage gain

Answer 234

Equal number of free electrons and holes

Answer 235

Large number of free electrons and few holes

Answer 236

Large number of holes and electrons

Answer 237

Large number of holes and few electrons

Answer 238

Semiconductor

Answer 239

Increase the minority carrier current

Answer 240

Lowers the potential barrier

Answer 241

Increase the majority carrier current

Answer 242

Raises the potential barrier

Answer 243

An amplifier

Answer 244

A rectifier

Answer 245

Filtering circuit

Answer 246

Decreases and then increases

Answer 247

Remains unchanged

Answer 248

It has high resistance to the current flow when reverse biased

Answer 249

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

Answer 250

It has low resistance to the current flow when forward biased

Answer 251

Its conductivity increases with rise of temperature

Answer 252

None of these

Answer 253

Positively charged

Answer 254

Negative charged

Answer 255

Decreases and then increases

Answer 256

Remains unchanged

Answer 257

Two PN-junctions

Answer 258

One PN-junction

Answer 259

Three PN-junctions

Answer 260

Four PN-junctions

Answer 261

any of above

Answer 262

Depends upon the nature of material

Answer 263

Both drift and diffusion of charges

Answer 264

Drift of charges

Answer 265

Diffusion of charges

Answer 266

Phosphorus

Answer 267

Capacitor is used

Answer 268

Solvent is used

Answer 269

Resistor is used

Answer 270

None of these

Answer 271

None of these

Answer 272

Current flows in pulses

Answer 273

Only half cycle is used

Answer 274

Current flows in one directions

Answer 275

None of these

Answer 276

Common collector configuration

Answer 277

None of these

Answer 278

Common base configuration

Answer 279

Common emitter configuration

Answer 280

The valence band is completely filled

Answer 281

The conduction band is completely empty

Answer 282

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

Answer 283

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

Answer 284

Oscillator

Answer 285

Half wave rectifier

Answer 286

Full wave rectifier

Answer 287

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

Answer 288

Major current carriers are mobile holes

Answer 289

Major current carriers are electrons

Answer 290

Major current carriers are mobile negative ions

Answer 291

Any of the above depending on nature of transistor

Answer 292

Step up transformer

Answer 293

Step down transformer

Answer 294

Three diodes in common

Answer 295

Triode vacuum tube

Answer 296

Point from north to south

Answer 297

Is located on the base

Answer 298

Is locate on the collector

Answer 299

Is located on the emitter

Answer 300

Raises the potential barrier

Answer 301

Lowers the potential barrier

Answer 302

Increases the majority carrier current

Answer 303

Increase the minority carrier current

Answer 304

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

Answer 305

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

Answer 306

From pure Si crystal

Answer 307

From pure Ge crystal

Answer 308

Shear modulus

Answer 309

Bulk modulus

Answer 310

None of these

Answer 311

Young’s modulus

Answer 312

Phosphorus

Answer 313

Holes move from base to emitter

Answer 314

Electrons move from emitter to base

Answer 315

Electrons move from collector to base

Answer 316

Electrons move from base to emitter

Answer 317

Or gates and NOT gates

Answer 318

AND gates, OR gates, and NOT gates

Answer 319

AND gates and NOT gates

Answer 320

OR gates only

Answer 321

None of these

Answer 322

Tensile stress

Answer 323

Compress ional stress

Answer 324

Shear stress

Answer 325

All of these

Answer 326

Magnification

Answer 327

Amplification

Answer 328

Rectification

Answer 329

Modulus of electricity

Answer 330

None of these

Answer 331

Young’s modulus

Answer 332

Bulk’s modulus

Answer 333

First A and B

Answer 334

Remains constant

Answer 335

p-type semiconductor

Answer 336

n-type conductor

Answer 337

n-type semiconductor

Answer 338

p-type conductor

Answer 339

p-type conductor

Answer 340

p-type semiconductor

Answer 341

n-type semiconductor

Answer 342

n-type conductor

Answer 343

Almost negligible

Answer 344

None of these

Answer 345

Transverse Waves

Answer 346

Electromagnetic Waves

Answer 347

Gamma Rays

Answer 348

Off switch

Answer 349

Copper increases and germanium decreases

Answer 350

Each of them decreases

Answer 351

Each of them increases

Answer 352

Copper decreases and germanium increases

Answer 353

None of these

Answer 354

Almost zero

Answer 355

Mobile ions

Answer 356

Immobile ions

Answer 357

Transistor

Answer 358

Suddenly increases

Answer 359

Remain fixed

Answer 360

Decreases slowly

Answer 361

Increases slowly

Answer 362

All of these

Answer 363

Low degree radiations

Answer 364

Low degree resistor

Answer 365

None of these

Answer 366

Light dependent resistance

Answer 367

Input and out signals are not in phase

Answer 368

May be in phase or not

Answer 369

Input and out signals are in phase

Answer 370

None of these

Answer 371

Thickness of emitter

Answer 372

Very small as compared to the thickness of emitter and collector

Answer 373

Mean of thickness of emitter and collector

Answer 374

Thickness of collector

Answer 375

Electric motors

Answer 376

Electric generations

Answer 377

Transformers

Answer 378

Dual carriers

Answer 379

Minority carriers

Answer 380

Majority carriers

Answer 381

That the base be heated

Answer 382

None of these

Answer 383

That the emitter be heated

Answer 384

That the collector be heated

Answer 385

None of these

Answer 386

Man hundred

Answer 387

Holes move from base to collector

Answer 388

Negative charge moves from emitter to base

Answer 389

Negative charge moves from collector to base

Answer 390

Holes move from emitter to base

Answer 391

The photo diodes

Answer 392

The light emitting diode

Answer 393

The switch

Answer 394

Solar cells

Answer 395

Logic gates

Answer 396

Oscillator

Answer 397

Equal number of free electrons and holes

Answer 398

Large number of holes and few electrons

Answer 399

Large number of free electrons and few holes

Answer 400

Large number of holes and electrons

Answer 401

Semiconductor

Answer 402

Super conductor

Answer 403

N-type material

Answer 404

P-type material

Answer 405

Can be any of the above three

Answer 406

None of these

Answer 407

Valence electrons

Answer 408

None of these

Answer 409

Tightly bound electrons

Answer 410

Free electrons

Answer 411

Doping density

Answer 412

Temperature

Answer 413

Diode design

Answer 414

Forward bias

Answer 415

Microsecond

Answer 416

Nanosecond

Answer 417

None of these

Answer 418

Millisecond

Answer 419

Insulators

Answer 420

Superconductors

Answer 421

Semiconductors

Answer 422

Oscillator

Answer 423

None of these

Answer 424

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

Answer 425

Free electrons in n-type and p-type

Answer 426

Holes in n-type and p-type

Answer 427

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

Answer 428

Holes move from emitter to base

Answer 429

Holes move from emitter to base

Answer 430

Electrons move from base to collector

Answer 431

Holes move from base to emitter

Answer 432

None of these

Answer 433

In reverse bias

Answer 434

In forward bias

Answer 435

Extra electrons

Answer 436

Missing electrons

Answer 437

Greater than one

Answer 438

Equal to one

Answer 439

Less than one

Answer 440

Phosphorus

Answer 441

P-type semiconductor

Answer 442

N-type conductor

Answer 443

N-type semiconductor

Answer 444

None of these

Answer 445

Zero biased

Answer 446

Reversed biased

Answer 447

None of these

Answer 448

Forward biased

Answer 449

None of these

Answer 450

Potential barrier is reduced to zero

Answer 451

Forward bias exceeds certain value

Answer 452

Reverse bias exceeds certain value

Answer 453

Forward current exceeds certain value

Answer 454

10¯⁶ cm

Answer 455

10¯¹² cm

Answer 456

None of these

Answer 457

Both A.C. & D.C.

Answer 458

All of these

Answer 459

Crystal lattice

Answer 460

Undetermined

Answer 461

High potential at P side and low potential at N side

Answer 462

P and N both are at same potential

Answer 463

High potential at N side and low potential at P side

Answer 464

Oscillator

Answer 465

Multivibrator

Answer 466

None of these

Answer 467

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

Answer 468

Both junctions are reverse biased

Answer 469

No bias voltages are required

Answer 470

Both junctions are forward biased

Answer 471

Oscillator

Answer 472

Logic gates

Answer 473

Remains same

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