Physics Electronics Online Mcqs Test

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Question 1

1. When an alternating accelerating field is applied to a charge it produces

Answer

Transverse Waves

Answer

Gamma Rays

Answer

Electromagnetic Waves

Question 2

2. 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 3

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

Answer

None of these

Question 4

4. Which one is forward bias?

Question 5

5. A transistor consists of

Answer

One PN-junction

Answer

Three PN-junctions

Answer

Four PN-junctions

Answer

Two PN-junctions

Question 6

6. Photodiode is used for

Answer

Light display

Answer

Detection of light

Answer

Emission of light

Answer

None of these

Question 7

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

Question 8

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

Question 9

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

Answer

None of these

Answer

Semiconductor

Answer

Superconductor

Question 10

10. In Germanium crystal, impurity donor elements have valiancy

Question 11

11. Diode can work as

Answer

Multivibrator

Answer

Oscillator

Question 12

12. The least doped region in a transistor is

Answer

Either emitter or collector

Question 13

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

Answer

Potential is zero

Answer

Electric field is zero

Answer

Electric field is maximum

Answer

Potential is maximum

Question 14

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

Answer

Missing electrons

Answer

Extra electrons

Question 15

15. Symbol represents

Question 16

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

Answer

Insulators

Answer

Conductors

Answer

Superconductors

Answer

Semiconductors

Question 17

17. In forward bias the width of potential barrier

Answer

Remains same

Question 18

18. To use a transistor as an amplifier

Answer

Both junctions are reverse biased

Answer

No bias voltages are required

Answer

Both junctions are forward biased

Answer

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

Question 19

19. Radio waves of constant amplitude can be generated with

Answer

Oscillator

Question 20

20. An OP-AMPs can amplify

Answer

None of these

Answer

Both A.C. & D.C.

Question 21

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

Answer

Millisecond

Answer

None of these

Answer

Nanosecond

Answer

Microsecond

Question 22

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

Answer

Transistor

Question 23

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

Answer

Man hundred

Answer

None of these

Question 24

24. 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 25

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

Answer

At least one input is LOW

Answer

All inputs are LOW

Answer

All inputs are HIGH

Answer

At least one input is HIGH

Question 26

26. The switch is open when the resistance between C and E becomes

Answer

Almost zero

Answer

None of these

Question 27

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

Answer

Superconductor

Question 28

28. In a semiconductor, the mobility of holes is

Answer

Greater than electrons

Answer

Less than electrons

Answer

Equal to electrons

Question 29

29. LDR means:

Answer

Low degree resistor

Answer

Light dependent resistance

Answer

None of these

Answer

Low degree radiations

Question 30

30. Zener breakdown in a semiconductor diode occurs when

Answer

Potential barrier is reduced to zero

Answer

Reverse bias exceeds certain value

Answer

Forward current exceeds certain value

Answer

Forward bias exceeds certain value

Question 31

31. At absolute zero, Si acts as

Answer

None of these

Question 32

32. Young’s modulus for copper is

Answer

None of these

Answer

110 Nm¯²

Answer

70 x 10 Nm¯²

Answer

91 x 10 Nm¯²

Question 33

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

Answer

Extra electrons

Answer

Missing electrons

Question 34

34. Which one is reverse-biased?

Question 35

35. Light emitting diode work when it is

Answer

Reverse biased

Answer

None of these

Answer

Forward biases

Question 36

36. The units of modulus of elasticity are same as that of

Answer

None of these

Question 37

37. A pieced 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

Each of them decreases

Answer

Copper increases and germanium decreases

Question 38

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

Answer

Oscillator

Answer

P-type material

Question 39

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

Answer

All of these

Question 40

40. 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 forward based

Answer

Diode is reverse biased

Question 41

41. In p-type semi-conductor, the majority charge carriers are

Question 42

42. The operation of a transistor requires

Answer

That the emitter be heated

Answer

That the base be heated

Answer

None of these

Answer

That the collector be heated

Question 43

43. When the output of OR gate is 1

Answer

If both inputs are zero

Answer

Only if both inputs are 1

Answer

If either or both inputs are 1

Answer

If either input is zero

Question 44

44. A substance which have empty conduction band is called

Answer

Semiconductor

Answer

None of these

Question 45

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

Answer

Common collector configuration

Answer

Common base configuration

Answer

None of these

Answer

Common emitter configuration

Question 46

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

Question 47

47. The p-n junction diode works as insulator, if connected

Answer

In forward bias

Answer

In reverse bias

Answer

None of these

Question 48

48. 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 49

49. When a pentavalent material like As, is added to tetravalent material l.e. Ge, we get a

Answer

N-type material

Answer

Semiconductor

Answer

Super conductor

Answer

P-type material

Question 50

50. Barrier potential of a p-n junction diode does not depend on:

Answer

Temperature

Answer

Doping density

Answer

Forward bias

Answer

Diode design

Question 51

51. A non-inverting closed-loop op-amp circuit generally has a gain factor:

Answer

Equal to one

Answer

Less than one

Answer

Greater than one

Question 52

52. Semi-conductor germanium and silicon are

Answer

Pentavalent

Answer

Tetravalent

Question 53

53. A device for converting an alternating current into a pulsating from or direct current is known as

Answer

None of these

Answer

Oscillator

Question 54

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

Answer

Several mega ohms

Question 55

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

Answer

Suppressing half wave of A.C supply by using diode

Answer

Using a Coolidge tube

Answer

Suppressing the harmonics in A.C voltage

Answer

Using a transistor

Question 56

56. When NPN transistor is used as an amplifier

Answer

Electrons move from collector to base

Answer

Electrons move from base to emitter

Answer

Electrons move from emitter to base

Answer

Holes move from base to emitter

Question 57

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

Answer

Tightly bound electrons

Answer

Valence electrons

Answer

Free electrons

Answer

None of these

Question 58

58. Which is normal used of transistor?

Answer

Switching device

Answer

P-type material

Question 59

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

Answer

Electric field is zero

Answer

Electric field is maximum

Answer

Potential is maximum

Answer

Potential is zero

Question 60

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

Answer

Decreases and then increases

Answer

Remains unchanged

Question 61

61. In half wave rectification

Answer

Current flows in one directions

Answer

Current flows in pulses

Answer

Only half cycle is used

Answer

None of these

Question 62

62. The positive sign of gain indicates that

Answer

None of these

Answer

Input and out signals are in phase

Answer

Input and out signals are not in phase

Answer

May be in phase or not

Question 63

63. The least doped region in a transistor is

Question 64

64. Photovoltaic cell produces electrical energy from

Answer

Chemical energy

Answer

Light energy

Answer

None of these

Answer

Heat energy

Answer 157

180° Phase shift

Answer 158

90° Phase shift

Answer 159

120° Phase shift

Answer 160

No Phase shift

Answer 161

Half wave rectifier

Answer 162

Full wave rectifier

Answer 163

None of these

Answer 164

N-type conductor

Answer 165

N-type semiconductor

Answer 166

P-type semiconductor

Answer 167

The valence band is completely filled

Answer 168

The conduction band is completely empty

Answer 169

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

Answer 170

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

Answer 171

Electrons and protons

Answer 172

Protons and electrons

Answer 173

Electrons and holes

Answer 174

Holes and electrons

Answer 175

None of these

Answer 176

p-type semiconductor

Answer 177

p-type conductor

Answer 178

n-type semiconductor

Answer 179

n-type conductor

Answer 180

Remains constant

Answer 181

First A and B

Answer 182

p-type semiconductor

Answer 183

n-type conductor

Answer 184

n-type semiconductor

Answer 185

p-type conductor

Answer 186

An amplifier

Answer 187

Filtering circuit

Answer 188

A rectifier

Answer 189

Semiconductors

Answer 190

Insulators

Answer 191

Superconductors

Answer 192

Phosphorus

Answer 193

Increase its electrical resistivity

Answer 194

Increase its electrical conductivity

Answer 195

Increase its life

Answer 196

Enable it to Telerate higher voltage

Answer 197

Electric motors

Answer 198

Electric generations

Answer 199

Transformers

Answer 200

Phosphorus

Answer 201

Major current carriers are mobile holes

Answer 202

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

Answer 203

Major current carriers are mobile negative ions

Answer 204

Major current carriers are electrons

Answer 205

Oscillator

Answer 206

Logic gates

Answer 207

None of these

Answer 208

may be p-type or n-type

Answer 209

None of these

Answer 210

HIGH inputs and a HIGH output

Answer 211

LOW inputs and a LOW output

Answer 212

LOW inputs and a HIGH output

Answer 213

Negative charge moves from emitter to base

Answer 214

Negative charge moves from collector to base

Answer 215

Holes move from emitter to base

Answer 216

Holes move from base to collector

Answer 217

OR gates only

Answer 218

AND gates, OR gates, and NOT gates

Answer 219

Or gates and NOT gates

Answer 220

AND gates and NOT gates

Answer 221

Solvent is used

Answer 222

Capacitor is used

Answer 223

None of these

Answer 224

Resistor is used

Answer 225

Any of above

Answer 226

Slightly less than emitter current

Answer 227

Equal to emitter current

Answer 228

Greater than emitter current

Answer 229

Holes move from emitter to base

Answer 230

Electrons move from base to collector

Answer 231

Holes move from emitter be base

Answer 232

Holes move from base to emitter

Answer 233

Logic gates

Answer 234

Oscillator

Answer 235

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

Answer 236

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

Answer 237

From pure Si crystal

Answer 238

From pure Ge crystal

Answer 239

p-type semiconductor

Answer 240

p-type conductor

Answer 241

n-type semiconductor

Answer 242

n-type conductor

Answer 243

Number of electrons increases while that of holes decreases

Answer 244

Number of electrons and holes remains same

Answer 245

Number of holes increases while that of holes decreases

Answer 246

Number of electrons and holes increases equally

Answer 247

Increase the majority carrier current

Answer 248

Increase the minority carrier current

Answer 249

Lowers the potential barrier

Answer 250

Raises the potential barrier

Answer 251

Band levels

Answer 252

Hidden energy states

Answer 253

Forbidden energy states

Answer 254

None of these

Answer 255

Valence band is partially filled with electrons

Answer 256

Conduction band is empty and valence band is filled with electrons

Answer 257

Conduction band is partially filled with electrons

Answer 258

Conduction band is filled with electrons and valence band is empty

Answer 259

None of these

Answer 260

A very high input impedance

Answer 261

A low output impedance

Answer 262

A very low input impedance

Answer 263

Decreased by reverse biasing

Answer 264

Is independent of voltage

Answer 265

Increased by forward biasing

Answer 266

Increased by reverse biasing

Answer 267

All of these

Answer 268

Crystal lattice

Answer 269

n-carriers and p-carriers respectively

Answer 270

n-carriers only

Answer 271

p-carriers and n-carriers respectively

Answer 272

p-carriers only

Answer 273

Diode is forward biased

Answer 274

None of these

Answer 275

Diode is reverse biased

Answer 276

Diode is neutralized

Answer 277

It offers a very low open loop gain all of above

Answer 278

It offers a very high inputs resistance to the input current

Answer 279

None of these

Answer 280

It offers a very low output resistance

Answer 281

NAND gates

Answer 282

Can be any of the above three

Answer 283

None of these

Answer 284

Current gain

Answer 285

Voltage gain

Answer 286

Input resistance

Answer 287

Drift of charges

Answer 288

Both drift and diffusion of charges

Answer 289

Diffusion of charges

Answer 290

Depends upon the nature of material

Answer 291

Remains unchanged

Answer 292

Decreases and then increases

Answer 293

Diffusion region

Answer 294

None of these

Answer 295

Depletion region

Answer 296

Charged region

Answer 297

Phosphorus

Answer 298

Large number of holes and few electrons

Answer 299

Large number of holes and electrons

Answer 300

Equal number of free electrons and holes

Answer 301

Large number of free electrons and few holes

Answer 302

Extra electrons

Answer 303

Missing of electrons

Answer 304

None of these

Answer 305

Require more current

Answer 306

Works efficiently

Answer 307

Triode vacuum tube

Answer 308

Three diodes in common

Answer 309

Step up transformer

Answer 310

Step down transformer

Answer 311

Almost negligible

Answer 312

any of above

Answer 313

All of above

Answer 314

Holes move from base to emitter

Answer 315

Electrons move from base to collector

Answer 316

Holes move from emitter to base

Answer 317

Holes move from emitter to base

Answer 318

Major current carriers are electrons

Answer 319

Major current carriers are mobile holes

Answer 320

Major current carriers are mobile negative ions

Answer 321

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

Answer 322

Resistance of both decreases

Answer 323

Resistance of both increases

Answer 324

Resistance of copper decreases while that of germanium increases

Answer 325

Resistance of copper increases while that of germanium decreases

Answer 326

Young’s modulus

Answer 327

None of these

Answer 328

Bulk modulus

Answer 329

Shear modulus

Answer 330

Mobile ions

Answer 331

Immobile ions

Answer 332

Is locate on the collector

Answer 333

Is located on the emitter

Answer 334

Is located on the base

Answer 335

Point from north to south

Answer 336

Detection of visible and invisible radiations

Answer 337

None of these

Answer 338

Logic gates

Answer 339

Automatic switching

Answer 340

Can be any of the above three

Answer 341

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

Answer 342

Free electrons in n-type and p-type

Answer 343

Holes in n-type and p-type

Answer 344

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

Answer 345

It has low resistance to the current flow when forward biased

Answer 346

Its conductivity increases with rise of temperature

Answer 347

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

Answer 348

It has high resistance to the current flow when reverse biased

Answer 349

Increases its electrical conductivity

Answer 350

Enable it to Telerate higher voltage

Answer 351

Increase its life

Answer 352

Increase its electrical resistivity

Answer 353

Remain fixed

Answer 354

Increases slowly

Answer 355

Decreases slowly

Answer 356

Suddenly increases

Answer 357

Solar cells

Answer 358

The light emitting diode

Answer 359

The switch

Answer 360

The photo diodes

Answer 361

Undetermined

Answer 362

High potential at P side and low potential at N side

Answer 363

P and N both are at same potential

Answer 364

High potential at N side and low potential at P side

Answer 365

None of these

Answer 366

Modulus of electricity

Answer 367

Bulk’s modulus

Answer 368

Young’s modulus

Answer 369

Under reverse bias

Answer 370

During the manufacturing process

Answer 371

When temperature varies

Answer 372

Under forward bias

Answer 373

Off switch

Answer 374

Variable amplitude

Answer 375

Zero amplitude

Answer 376

Constant amplitude

Answer 377

Unit amplitude

Answer 378

Phosphorus

Answer 379

A universal gate

Answer 380

A basic universal gate

Answer 381

Not a universal gate

Answer 382

A basic gate

Answer 383

Conduction band is partially filled with electrons

Answer 384

Valence band is partially filled with electrons

Answer 385

Conduction band is filled with electrons and valence bad is empty

Answer 386

Conduction band is empty and valence band is filled with electrons

Answer 387

None of these

Answer 388

Reversed biased

Answer 389

Forward biased

Answer 390

Zero biased

Answer 391

Each of them increases

Answer 392

Copper decreases and germanium increases

Answer 393

Copper increases and germanium decreases

Answer 394

Each of them decreases

Answer 395

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

Answer 396

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

Answer 397

Both collector and emitter are negative with respect to the base

Answer 398

Both collector and emitter are positive with respect to the base

Answer 399

Tensile stress

Answer 400

None of these

Answer 401

Compress ional stress

Answer 402

Shear stress

Answer 403

Amorphous solids

Answer 404

Crystalline solids

Answer 405

Glassy solids

Answer 406

Polymeric solids

Answer 407

Raises the potential barrier

Answer 408

Increase the minority carrier current

Answer 409

Lowers the potential barrier

Answer 410

Increases the majority carrier current

Answer 411

The valence band is completely filled

Answer 412

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

Answer 413

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

Answer 414

The conduction band is completely empty

Answer 415

Semiconductor

Answer 416

None of these

Answer 417

Low voltage to high voltage

Answer 418

D.C. into A.C.

Answer 419

High voltage to low voltage

Answer 420

A.C. into D.C.

Answer 421

The number of mobile holes exceeds the number of acceptors

Answer 422

Major carrier is mobile negative ions

Answer 423

Major carrier is mobile holes

Answer 424

Major current carrier is electrons

Answer 425

Comparator

Answer 426

INVERTER gate

Answer 427

Positively charged

Answer 428

None of these

Answer 429

Negative charged

Answer 430

Opposes the input signal

Answer 431

Aids the input signal

Answer 432

Is proportional to differential voltage gain

Answer 433

Is proportional to output current

Answer 434

None of these

Answer 435

Both are at the same potential

Answer 436

Both are at the high potential

Answer 437

Inverting terminal is at high potential

Answer 438

Non-inverting terminal is at high potential

Answer 439

Increases the majority carrier current

Answer 440

Lowers the potential barrier

Answer 441

Raises the potential barrier

Answer 442

Increase the minority carrier current

Answer 443

None of these

Answer 444

All of these

Answer 445

Rectification

Answer 446

Amplification

Answer 447

Magnification

Answer 448

Negative charge moves from collector to base

Answer 449

Holes move from base to collector

Answer 450

Holes move from emitter to base

Answer 451

Negative charge moves from emitter to base

Answer 452

Increased by forward biasing

Answer 453

Is independent of voltage

Answer 454

Decreased by reverse biasing

Answer 455

Increased by reverse biasing

Answer 456

High voltage to low voltage

Answer 457

D.C. into A.C.

Answer 458

A.C. into D.C.

Answer 459

Low voltage to high voltage

Answer 460

10¯⁶ cm

Answer 461

10¯¹² cm

Answer 462

Any of above

Answer 463

Semiconductors

Answer 464

Superconductors

Answer 465

Insulators

Answer 466

Mean of thickness of emitter and collector

Answer 467

Very small as compared to the thickness of emitter and collector

Answer 468

Thickness of emitter

Answer 469

Thickness of collector

Answer 470

Dual carriers

Answer 471

Majority carriers

Answer 472

Minority carriers

Answer 473

None of these

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