Physics Electronics Online Mcqs Test

Q: How can I prepare for Physics Electronics Online Mcqs Test?

You can prepare for Physics Electronics Online Mcqs Test by attempting the free online quizzes at Gotest.com.pk. We provide instant results, performance reports, and detailed explanations for every question.

Question 1

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

Answer

Is independent of voltage

Answer

Increased by forward biasing

Answer

Decreased by reverse biasing

Answer

Increased by reverse biasing

Question 2

2. Which one is forward bias?

Question 3

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

Answer

Variable amplitude

Answer

Constant amplitude

Answer

Zero amplitude

Answer

Unit amplitude

Question 4

4. Radio waves of constant amplitude can be generated with

Answer

Oscillator

Question 5

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

Answer

Missing electrons

Answer

Extra electrons

Question 6

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

Answer

First A and B

Answer

Remains constant

Question 7

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

Answer

None of these

Question 8

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

Answer

None of these

Answer

Oscillator

Question 9

9. Application of photodiode is/are

Answer

None of these

Answer

Detection of visible and invisible radiations

Answer

Logic gates

Answer

Automatic switching

Question 10

10. Polythene, potystrene and nylon are examples of

Answer

Glassy solids

Answer

Polymeric solids

Answer

Crystalline solids

Answer

Amorphous solids

Question 11

11. In a n-p-n transistor:

Answer

Negative charge moves from emitter to base

Answer

Negative charge moves from collector to base

Answer

Holes move from base to collector

Answer

Holes move from emitter to base

Question 12

12. Young’s modulus for copper is

Answer

None of these

Answer

91 x 10 Nm¯²

Answer

110 Nm¯²

Answer

70 x 10 Nm¯²

Question 13

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

Answer

Missing of electrons

Answer

Extra electrons

Question 14

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

Answer

Remains unchanged

Answer

Decreases and then increases

Question 15

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

Answer

Oscillator

Answer

Logic gates

Question 16

16. NAND gate is

Answer

A basic universal gate

Answer

Not a universal gate

Answer

A basic gate

Answer

A universal gate

Question 17

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

Answer

Equal number of free electrons and holes

Answer

Large number of free electrons and few holes

Answer

Large number of holes and electrons

Answer

Large number of holes and few electrons

Question 18

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

Answer

None of these

Answer

Semiconductor

Answer

Superconductor

Question 19

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

Answer

Electric field is zero

Answer

Potential is maximum

Answer

Electric field is maximum

Answer

Potential is zero

Question 20

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

Answer

Gamma Rays

Answer

Electromagnetic Waves

Answer

Transverse Waves

Question 21

21. 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 22

22. Reverse bias applied on a junction diode

Answer

Increases the majority carrier current

Answer

Increase the minority carrier current

Answer

Lowers the potential barrier

Answer

Raises the potential barrier

Question 23

23. 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 24

24. At absolute zero, Si acts as

Answer

None of these

Question 25

25. Transistors with various combinations are widely used as switches in:

Answer

Electric generations

Answer

Transformers

Answer

Electric motors

Question 26

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

Answer

Each of them decreases

Answer

Copper increases and germanium decreases

Answer

Each of them increases

Answer

Copper decreases and germanium increases

Question 27

27. A diode as a rectifier converts:

Answer

High voltage to low voltage

Answer

Low voltage to high voltage

Answer

D.C. into A.C.

Answer

A.C. into D.C.

Question 28

28. A diode as a rectifier converts:

Answer

High voltage to low voltage

Answer

D.C. into A.C.

Answer

A.C. into D.C.

Answer

Low voltage to high voltage

Question 29

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

Question 30

30. A n-p-n transistor conducts when

Answer

Collector is positive and emitter is 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

Both collector and emitter are negative with respect to the base

Question 31

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

Answer

Protons and electrons

Answer

Electrons and holes

Answer

Holes and electrons

Answer

Electrons and protons

Question 32

32. The ratio of tensile stress to tensile strain is called

Answer

Young’s modulus

Answer

None of these

Answer

Bulk’s modulus

Answer

Modulus of electricity

Question 33

33. Which logic gate is represented by following diagram?

Question 34

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

Question 35

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

Answer

It offers a very low output resistance

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

None of these

Question 36

36. Depletion layer consists of

Answer

Immobile ions

Answer

Mobile ions

Question 37

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

Answer

Large number of holes and few electrons

Answer

Large number of free electrons and few holes

Answer

Large number of holes and electrons

Answer

Equal number of free electrons and holes

Question 38

38. In insulators

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

Answer

Valence band is partially filled with electrons

Question 39

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

Answer

None of these

Question 40

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

Answer

Transistor

Question 41

41. Symbol represents

Question 42

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

Answer

All inputs are LOW

Answer

At least one input is LOW

Answer

All inputs are HIGH

Answer

At least one input is HIGH

Question 43

43. 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 44

44. A substance which have empty conduction band is called

Answer

None of these

Answer

Semiconductor

Question 45

45. LDR means:

Answer

Light dependent resistance

Answer

Low degree radiations

Answer

Low degree resistor

Answer

None of these

Question 46

46. Semi-conductor germanium and silicon are

Answer

Tetravalent

Answer

Pentavalent

Question 47

47. The least doped region in a transistor is

Answer

Either emitter or collector

Question 48

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

Answer

Superconductor

Question 49

49. The operation of a transistor requires

Answer

That the base be heated

Answer

None of these

Answer

That the collector be heated

Answer

That the emitter be heated

Question 50

50. Photovoltaic cell produces electrical energy from

Answer

None of these

Answer

Heat energy

Answer

Light energy

Answer

Chemical energy

Question 51

51. n-type semiconductor if formed

Answer

From pure Si crystal

Answer

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

Answer

From pure Ge crystal

Answer

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

Question 52

52. The semiconductor diode can be used as a rectifier because _

Answer

It has high resistance to the current flow when reverse biased

Answer

Its conductivity increases with rise of temperature

Answer

It has low resistance to the current flow when forward biased

Answer

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

Question 53

53. When a strength changes the length of a body, it is called

Answer

Compress ional stress

Answer

Shear stress

Answer

None of these

Answer

Tensile stress

Question 54

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

Answer

Valence electrons

Answer

Tightly bound electrons

Answer

Free electrons

Answer

None of these

Question 55

55. p-n junction when reversed biased acts as a

Answer

Off switch

Question 56

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

Answer

Missing electrons

Answer

Extra electrons

Question 57

57. Exclusive-OR (XOR) logic gates can be constructed from what other logic gates?

Answer

Or gates and NOT gates

Answer

AND gates, OR gates, and NOT gates

Answer

AND gates and NOT gates

Answer

OR gates only

Question 58

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

Answer

Logic gates

Answer

Oscillator

Question 59

59. Reverse bias applied on a junction diode

Answer

Raises the potential barrier

Answer

Increases the majority carrier current

Answer

Lowers the potential barrier

Answer

Increase the minority carrier current

Question 60

60. 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 61

61. 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

Copper increases and germanium decreases

Answer

Each of them increases

Question 62

62. When a p-n junction diode is reverse biased, the flow of current across the junction is mainly due to

Answer

Drift of charges

Answer

Diffusion of charges

Answer

Both drift and diffusion of charges

Answer

Depends upon the nature of material

Question 63

63. In a semiconductor, the mobility of holes is

Answer

Less than electrons

Answer

Greater than electrons

Answer

Equal to electrons

Question 64

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

Answer

Crystal lattice

Answer

All of these

Answer 182

Both junctions are forward biased

Answer 183

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

Answer 184

No bias voltages are required

Answer 185

Both junctions are reverse biased

Answer 186

10¯¹² cm

Answer 187

10¯⁶ cm

Answer 188

Holes move from base to collector

Answer 189

Negative charge moves from collector to base

Answer 190

Negative charge moves from emitter to base

Answer 191

Holes move from emitter to base

Answer 192

Phosphorus

Answer 193

Current gain

Answer 194

Voltage gain

Answer 195

None of these

Answer 196

Input resistance

Answer 197

Virtual input

Answer 198

Non-inverting voltage at output

Answer 199

Reference voltage on the other

Answer 200

All of these

Answer 201

P-type material

Answer 202

Oscillator

Answer 203

Reverse biased

Answer 204

Forward biases

Answer 205

None of these

Answer 206

Using a transistor

Answer 207

Suppressing half wave of A.C supply by using diode

Answer 208

Using a Coolidge tube

Answer 209

Suppressing the harmonics in A.C voltage

Answer 210

No Phase shift

Answer 211

90° Phase shift

Answer 212

180° Phase shift

Answer 213

120° Phase shift

Answer 214

Holes move from base to emitter

Answer 215

Electrons move from collector to base

Answer 216

Electrons move from emitter to base

Answer 217

Electrons move from base to emitter

Answer 218

Valence band is partially filled with electrons

Answer 219

Conduction band is partially filled with electrons

Answer 220

Conduction band is empty and valence band is filled with electrons

Answer 221

Conduction band is filled with electrons and valence band is empty

Answer 222

Full wave rectifier

Answer 223

Half wave rectifier

Answer 224

Forward biased

Answer 225

None of these

Answer 226

Zero biased

Answer 227

Reversed biased

Answer 228

Increase its life

Answer 229

Enable it to Telerate higher voltage

Answer 230

Increase its electrical conductivity

Answer 231

Increase its electrical resistivity

Answer 232

None of these

Answer 233

may be p-type or n-type

Answer 234

Potential is zero

Answer 235

Electric field is zero

Answer 236

Potential is maximum

Answer 237

Electric field is maximum

Answer 238

Shear modulus

Answer 239

Young’s modulus

Answer 240

Bulk modulus

Answer 241

None of these

Answer 242

Diode is forward based

Answer 243

Diode is reverse biased

Answer 244

Potential barrier in depletion layer increases

Answer 245

Potential barrier in depletion layer remains unchanged

Answer 246

n-type conductor

Answer 247

n-type semiconductor

Answer 248

p-type semiconductor

Answer 249

p-type conductor

Answer 250

Reverse bias exceeds certain value

Answer 251

Forward current exceeds certain value

Answer 252

Forward bias exceeds certain value

Answer 253

Potential barrier is reduced to zero

Answer 254

Decreases and then increases

Answer 255

Remains unchanged

Answer 256

P-type semiconductor

Answer 257

None of these

Answer 258

N-type conductor

Answer 259

N-type semiconductor

Answer 260

Holes move from base to emitter

Answer 261

Electrons move from base to collector

Answer 262

Holes move from emitter to base

Answer 263

Holes move from emitter to base

Answer 264

Capacitor is used

Answer 265

Resistor is used

Answer 266

Solvent is used

Answer 267

None of these

Answer 268

Forward bias

Answer 269

Doping density

Answer 270

Temperature

Answer 271

Diode design

Answer 272

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

Answer 273

Major current carriers are mobile negative ions

Answer 274

Major current carriers are mobile holes

Answer 275

Major current carriers are electrons

Answer 276

None of these

Answer 277

None of these

Answer 278

Hidden energy states

Answer 279

Band levels

Answer 280

Forbidden energy states

Answer 281

All of above

Answer 282

Resistance of both increases

Answer 283

Resistance of copper increases while that of germanium decreases

Answer 284

Resistance of both decreases

Answer 285

Resistance of copper decreases while that of germanium increases

Answer 286

n-type semiconductor

Answer 287

n-type conductor

Answer 288

p-type conductor

Answer 289

p-type semiconductor

Answer 290

Semiconductor

Answer 291

Super conductor

Answer 292

N-type material

Answer 293

P-type material

Answer 294

Number of holes increases while that of holes decreases

Answer 295

Number of electrons and holes increases equally

Answer 296

Number of electrons increases while that of holes decreases

Answer 297

Number of electrons and holes remains same

Answer 298

Equal to one

Answer 299

Greater than one

Answer 300

Less than one

Answer 301

Positively charged

Answer 302

None of these

Answer 303

Negative charged

Answer 304

Can be any of the above three

Answer 305

None of these

Answer 306

Detection of light

Answer 307

Emission of light

Answer 308

Light display

Answer 309

Works efficiently

Answer 310

None of these

Answer 311

Require more current

Answer 312

n-carriers only

Answer 313

p-carriers only

Answer 314

n-carriers and p-carriers respectively

Answer 315

p-carriers and n-carriers respectively

Answer 316

Phosphorus

Answer 317

Holes move from emitter be base

Answer 318

Holes move from emitter to base

Answer 319

Electrons move from base to collector

Answer 320

Holes move from base to emitter

Answer 321

The valence band is completely filled

Answer 322

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

Answer 323

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

Answer 324

The conduction band is completely empty

Answer 325

Increases slowly

Answer 326

Suddenly increases

Answer 327

Decreases slowly

Answer 328

Remain fixed

Answer 329

Aids the input signal

Answer 330

Is proportional to output current

Answer 331

Is proportional to differential voltage gain

Answer 332

Opposes the input signal

Answer 333

Superconductors

Answer 334

Insulators

Answer 335

Semiconductors

Answer 336

Thickness of emitter

Answer 337

Mean of thickness of emitter and collector

Answer 338

Thickness of collector

Answer 339

Very small as compared to the thickness of emitter and collector

Answer 340

None of these

Answer 341

Nanosecond

Answer 342

Microsecond

Answer 343

Millisecond

Answer 344

Insulators

Answer 345

Semiconductors

Answer 346

Superconductors

Answer 347

Solar cells

Answer 348

The switch

Answer 349

The photo diodes

Answer 350

The light emitting diode

Answer 351

Step down transformer

Answer 352

Triode vacuum tube

Answer 353

Step up transformer

Answer 354

Three diodes in common

Answer 355

Any of above

Answer 356

Remains same

Answer 357

Filtering circuit

Answer 358

A rectifier

Answer 359

An amplifier

Answer 360

Is independent of voltage

Answer 361

Decreased by reverse biasing

Answer 362

Increased by reverse biasing

Answer 363

Increased by forward biasing

Answer 364

Comparator

Answer 365

INVERTER gate

Answer 366

Slightly less than emitter current

Answer 367

Equal to emitter current

Answer 368

Any of above

Answer 369

Greater than emitter current

Answer 370

None of these

Answer 371

None of these

Answer 372

Man hundred

Answer 373

None of these

Answer 374

Major current carriers are electrons

Answer 375

Major current carriers are mobile negative ions

Answer 376

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

Answer 377

Major current carriers are mobile holes

Answer 378

Superconductors

Answer 379

Insulators

Answer 380

Semiconductors

Answer 381

Conductors

Answer 382

Multivibrator

Answer 383

Oscillator

Answer 384

Common base configuration

Answer 385

Common emitter configuration

Answer 386

Common collector configuration

Answer 387

None of these

Answer 388

Can be any of the above three

Answer 389

None of these

Answer 390

Both A.C. & D.C.

Answer 391

Switching device

Answer 392

P-type material

Answer 393

None of these

Answer 394

A very low input impedance

Answer 395

A very high input impedance

Answer 396

A low output impedance

Answer 397

Majority carriers

Answer 398

Minority carriers

Answer 399

Dual carriers

Answer 400

Increase its life

Answer 401

Enable it to Telerate higher voltage

Answer 402

Increases its electrical conductivity

Answer 403

Increase its electrical resistivity

Answer 404

p-type conductor

Answer 405

n-type semiconductor

Answer 406

p-type semiconductor

Answer 407

n-type conductor

Answer 408

Lowers the potential barrier

Answer 409

Increase the minority carrier current

Answer 410

Increase the majority carrier current

Answer 411

Raises the potential barrier

Answer 412

Depletion region

Answer 413

None of these

Answer 414

Diffusion region

Answer 415

Charged region

Answer 416

Holes in n-type and p-type

Answer 417

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

Answer 418

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

Answer 419

Free electrons in n-type and p-type

Answer 420

NAND gates

Answer 421

May be in phase or not

Answer 422

None of these

Answer 423

Input and out signals are not in phase

Answer 424

Input and out signals are in phase

Answer 425

The valence band is completely filled

Answer 426

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

Answer 427

The conduction band is completely empty

Answer 428

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

Answer 429

Almost negligible

Answer 430

Several mega ohms

Answer 431

None of these

Answer 432

Phosphorus

Answer 433

The number of mobile holes exceeds the number of acceptors

Answer 434

Major current carrier is electrons

Answer 435

Major carrier is mobile holes

Answer 436

Major carrier is mobile negative ions

Answer 437

Semiconductor

Answer 438

Only if both inputs are 1

Answer 439

If either or both inputs are 1

Answer 440

If either input is zero

Answer 441

If both inputs are zero

Answer 442

None of these

Answer 443

Almost zero

Answer 444

In reverse bias

Answer 445

In forward bias

Answer 446

None of these

Answer 447

Two PN-junctions

Answer 448

Three PN-junctions

Answer 449

One PN-junction

Answer 450

Four PN-junctions

Answer 451

any of above

Answer 452

Diode is reverse biased

Answer 453

None of these

Answer 454

Diode is forward biased

Answer 455

Diode is neutralized

Answer 456

All of these

Answer 457

Amplification

Answer 458

Magnification

Answer 459

Rectification

Answer 460

When temperature varies

Answer 461

Under reverse bias

Answer 462

During the manufacturing process

Answer 463

Under forward bias

Answer 464

Non-inverting terminal is at high potential

Answer 465

Inverting terminal is at high potential

Answer 466

Both are at the same potential

Answer 467

Both are at the high potential

Answer 468

P and N both are at same potential

Answer 469

Undetermined

Answer 470

High potential at N side and low potential at P side

Answer 471

High potential at P side and low potential at N side

Answer 472

Phosphorus

Answer 473

None of these

Total Questions:	177
Time Allowed:	60 Minutes
Total Marks:	177
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	Physics Test ECAT Test MDCAT Test FPSC/PPSC/SPSC/KPPSC/BPSC/AJKPSC/NTS Physics Interview Question Answer

Physics Electronics Online Mcqs Test

Important Electronics Question and Answer

Physics Electronics Practice Test Online With Explanation

How to Score High in Physics Electronics Online Mcqs Test?

Key Preparation Tips:

More Related Resources

Malik Tahir

Leave a Reply Cancel reply

Important Electronics Question and Answer

Physics Electronics Practice Test Online With Explanation

How to Score High in Physics Electronics Online Mcqs Test?

Key Preparation Tips:

More Related Resources

Latest Updates

Malik Tahir

Leave a Reply Cancel reply