Physics Optics Online Mcqs Test

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

You can prepare for Physics Optics 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. In a astronomical telescope the final image for normal vision is formed at

Answer

The focal of the eye piece

Answer

The least distance of the distinct vision

Answer

The focus of the objective lens

Question 2

2. In a compound microscope, the intermediate image is

Answer

Real, erect and magnified

Answer

Virtual, erect and magnified

Answer

Virtual, inverted and magnified

Answer

Virtual, erect and reduced

Question 3

3. If f = 5 cm and d = 25 cm then the magnification will be

Question 4

4. For the normal setting of a telescope

Answer

Only the final image is at infinity

Answer

Only the object is at infinity

Answer

Both the object and the final image is at infinity

Answer

Neither the object nor the final image has to be at infinity

Question 5

5. The splitting of white light into several colors on passing through a glass prism is due to

Answer

Diffraction

Answer

Refraction

Answer

Reflection

Answer

Interference

Question 6

6. For interference to occur, the interfering beams of light must be

Answer

Of difference frequencies

Answer

White light

Question 7

7. In Huygen’s wave theory, the locus of all points in the same state of vibration is called

Answer

Wave front

Answer

A half-period zone

Question 8

8. If the dark fringe is to be observed then we have relation

Answer

Y = (m+1)λL/d

Answer

Y = (m+1/2)λd/L

Answer

Y = (m+1/2) dL/λ

Answer

Y = (m+1/2)λL/d

Question 9

9. Resolving power of a telescope depends on:

Answer

Diameter of objective lens

Answer

The focal length of objective lens

Answer

The magnification of eyepiece

Answer

Refractive index of objective lens

Question 10

10. The fringe spacing in case of blue light

Answer

None of these

Answer

Remains the same

Question 11

11. Which of the following frequency ranges includes most of the electromagnetic waves emitted by the ultra – violet tubes used in a sun bed?

Answer

5 x 10⁸ to 5 x 10¹¹ Hz

Answer

5 x 10⁵ to 5 x 10⁸ Hz

Answer

5 x 10¹¹ to 5 x 10¹⁴ Hz

Answer

5 x 10¹⁴ to 5 x 10¹⁷ Hz

Question 12

12. Which one of the following phenomena is not explained by Hygen’s construction of wave front?

Answer

Origin of spectra

Answer

Reflection

Answer

Refraction

Answer

Diffraction

Question 13

13. Signal form a remote control to the device operated by it travels with the speed of:

Answer

Supersonics

Answer

Ultrasonics

Question 14

14. A beam of light enters air from water. Which of the following characteristics of light will not change in water?

Answer

Wavelength

Question 15

15. If the red light is replaced by blue light illuminating the object in a microscope the resolving power of the microscope

Answer

Gets halved

Answer

Remains unchanged

Question 16

16. Soap bubble looks colored due to

Answer

Dispersion

Answer

Reflection

Answer

Interference

Answer

Any one of these

Question 17

17. For interference to occur, the two light waves should be:

Answer

Of high intensity

Answer

Coming from opposite direction

Answer

Of two different frequencies

Answer

Monochromatic

Question 18

18. A point where the incident parallel rays of light converge or appear to diverge after passing through a lens is called

Answer

Center of curvature

Answer

Optical center

Question 19

19. A convex lens gives a virtual image only when the objects lies

Answer

Between principal focus and center of curvature

Answer

Beyond 2 f

Answer

At the principal focus

Answer

Between principal focus and optical center

Question 20

20. Choose the correct statement

Answer

There is no relationship between rays and wave fronts

Answer

Rays are normal to wave front

Answer

Rays are not normal to wave front

Answer

Raya may be normal to wave front

Question 21

21. Which of the following wavelengths will suffer maximum deviation while passing through a prism?

Question 22

22. Ultra – violet rays differ from X-rays in that ultra – violet rays

Answer

Do not affect a photographic plate

Answer

Have a lower frequency

Answer

Cannot be diffracted

Answer

Cannot be polarized

Question 23

23. Which one type of fiber is more suitable for transmission of signals in which white light is used?

Answer

Single mode step index fiber

Answer

Multi-mode graded index fiber

Answer

Multi-mode step index fiber

Answer

Mono mode step index fiber

Question 24

24. Due to Plano convex lens and the plane glass plate the thickness of air film changes from the center to outward

Answer

None of these

Answer

Decreasing gradually

Answer

Increasing gradually

Answer

It is constant at the center

Question 25

25. To demonstrate the phenomenon of interference we require two sources that emit radiation

Answer

Of same frequency

Answer

Of nearly the same frequency

Answer

Different wavelength

Answer

Of the same frequency and having definite phase relationship

Question 26

26. The light produced by a laser is all the following except

Answer

Incoherent

Answer

Electromagnetic

Answer

Monochromatic

Answer

In the form of a narrow beam

Question 27

27. A convex lens acts as a diverging lens if the

Answer

If the object is within f

Answer

Object is beyond C

Answer

Both b and c

Answer

If the object is with in C

Question 28

28. For obtaining equal and same height of the image, mirror used should be

Question 29

29. Choose the correct statement

Answer

Rays are normal to wave front

Answer

Rays are not normal to wave front

Answer

There is no relationship between rays and wave fronts

Answer

Rays may be normal to wave front

Question 30

30. Inverse square law for luminance is valid for

Answer

All types of sources

Answer

Cylindrical source

Answer

Search light

Answer

Isotropic point source

Question 31

31. There is no noticeable boundary between core and cladding

Answer

Single mode step index fiber

Answer

Multi-mode graded index fiber

Answer

Multi-mode step index fiber

Answer

All types of fiber

Question 32

32. Consider telecommunication through optical fibers. Which of the following statements is not true?

Answer

Optical fibers have extremely low transmission loss

Answer

Optical fibers are subject to electromagnetic interference from outside

Answer

Optical fibers can be of graded refractive index

Answer

Optical fibers may have homogeneous core with a suitable cladding

Question 33

33. In multimode step index fiber the refractive index of core and cladding is

Answer

Different with refractive index of core higher than cladding

Question 34

34. Which of the following spectrum have all the frequencies from high to low frequency range?

Answer

Band spectrum

Answer

Discontinuous spectrum

Answer

Continuous spectrum

Answer

Line spectrum

Question 35

35. Wavelength of light of frequency 100 Hz is

Answer

5 x 10⁶ m

Answer

4 x 10⁶ m

Answer

2 x 10⁶ m

Answer

3 x 10⁶ m

Question 36

36. In compound microscope, length of microscope is 21.5 cm, focal length of objective is 1.6 cm, focal length of eye piece is 2.1 cm and if final image is formed at infinity they distance of object from objective lens is

Question 37

37. Wavelength of light of frequency 100 Hz is

Answer

4 x 10⁶ m

Answer

3 x 10⁶ m

Answer

2 x 10⁶ m

Answer

5 x 10⁶ m

Question 38

38. In the phenomenon of interference, the bright and dark fringes are of

Answer

Dark fringes are thicker than bright

Answer

None of these

Answer

Equal width

Answer

Different width

Question 39

39. According to Huygen, every point on a wave front may be regarded as a __________ of secondary wavelets.

Question 40

40. Huygen’s wave fronts which sends out secondary wavelets with a speed equal to

Answer

Speed of propagation less than the wave

Answer

Speed of propagation of the wave

Answer

Speed of propagation greater than wave

Answer

None of these

Question 41

41. The contrast in the fringes in any interference pattern depends on

Answer

Fringe width

Answer

Distance between the slits

Answer

Intensity ratio of the sources

Answer

Wavelength

Question 42

42. When the object is placed at 2f of a convex lens then the image formed behind the lens will be

Answer

At the focus

Answer

Between f and 2 f

Question 43

43. A lens which converges a beam of parallel rays to a point is called

Answer

Converging (or convex) lens

Answer

Diverging (or concave) lens

Answer

Plano concave lens

Answer

Plano convex lens

Question 44

44. What is the most important function of telescope?

Answer

Resolution

Answer

Magnification

Answer

None of these

Answer

Light collection

Question 45

45. A telescope has an objective lens of focal length 1.5m and an eye piece of focal length 5 cm. IF this telescope is used in normal setting to view a tower of height 100m located 3km away, what will be the height of the image of the tower?

Question 46

46. If N is the number of rulings on the grating, then the resolving power in the mth order diffraction equals to

Answer

R = N x m²

Question 47

47. Optic fibers are related with

Answer

None of these

Answer

Communication

Question 48

48. To get the position of the image of an object at least how many rays emerging from any point of the object are required?

Question 49

49. Ray optics is valid, when characteristic dimensions are

Answer

Of the same order as the wavelength of light

Answer

Much smaller than the wavelength of length

Answer

Much larger than the wavelength of light

Answer

Of the order of one millimeter

Question 50

50. Which of the following has least wavelength?

Answer

Cosmic-rays

Answer

Ultra-violet rays

Question 51

51. At what distance should a book be placed from a 50 cd bulb so that the luminance on the book becomes 2 lm m¯²

Question 52

52. A prism splits a beam of white light into its seven constituent colors. This is so because

Answer

Velocity of different colors is different

Answer

Energy of different colors is different

Answer

Amplitude of different colors is different

Answer

Phase of different colors is different

Question 53

53. The critical angle for a ray of light suffering total internal reflection will be smallest for the ray traveling from

Answer

Water to air

Answer

Glass to water

Answer

Water to glass

Answer

Glass to air

Question 54

54. If the path difference must be half-integral number wavelength

Answer

d sin θ = (m + 1)²

Answer

d sin θ = (m + 1/2)²

Answer

d sin θ = (m + 1/2)⁴

Answer

d sin θ = (m + 1/2)

Question 55

55. In Young’s experiment, a dark fringe is observed when:

Answer

2π Sin θ = (m + ½)λ

Answer

½ d Sin θ = mλ

Answer

.m Sin θ = (d + ½)λ

Answer

.d Sin θ = (m + ½)λ

Question 56

56. Geometrical optics cannot give following characteristics for a microscope

Answer

Any of the above

Answer

Image size

Answer

Image position

Answer

Resolution of image

Question 57

57. A convex lens has focal length F. An object is placed at F then

Answer

Image is formed at + ∞ and is virtual

Answer

Image is formed at + ∞ and is real

Answer

Image is formed at - ∞ and is virtual

Answer

Image is formed at - ∞ and is real

Question 58

58. Magnifying power of simple microscope

Answer

Increase with decrease in focal length

Answer

No effect with decrease or increase with focal length

Answer

List distance of distinct vision

Answer

Increase with increase in focal length

Question 59

59. Resolving power of a telescope depends on:

Answer

Refractive index of objective lens

Answer

The magnification of eyepiece

Answer

Diameter of objective lens

Answer

The focal length of objective lens

Question 60

60. Power of a lens is one diopter if its focal length is

Question 61

61. The diameter of a lens under use is called the

Answer

Principal focus of the lens

Answer

Pole of the lens

Answer

Aperture of the lens

Answer

Radius of curvature of the lens

Question 62

62. A spectrum which contains all wavelengths without any break is called

Answer

Emission spectrum

Answer

All of these

Answer

Continuous emission spectrum

Answer

Line spectrum

Question 63

63. Critical angle of light passing from glass to air is minimum for

Question 64

64. A spectrometer is an optical device used to study the spectra from different sources of light which is

Answer

None of these

Answer

fₒ - fₑ

Answer

fₑ + fₒ

Answer

fₑ - fₒ

Answer 189

Image position

Answer 190

Any of the above

Answer 191

Resolution of image

Answer 192

Image size

Answer 193

None of these

Answer 194

Housefly will be seen reduced in image

Answer 195

Intensity of image will be increased

Answer 196

Housefly will be seen enlarged in image

Answer 197

Intensity of image will be decreased

Answer 198

Glass to water

Answer 199

Water to glass

Answer 200

Glass to air

Answer 201

Water to air

Answer 202

Interference pattern produced due to thin oil film

Answer 203

Polarization

Answer 204

Diffraction pattern

Answer 205

Total internal reflection of light

Answer 206

Neither zero (0) nor one (1)

Answer 207

Both zero (0) and one (1)

Answer 208

Plano convex

Answer 209

Cylindrical

Answer 210

αmin = 1.21 λ/D

Answer 211

αmin = 1.28 D/λ

Answer 212

αmin = 1.22 λ/D

Answer 213

αmin = 1.22 D/λ

Answer 214

Using monochromatic light of higher frequency

Answer 215

Using monochromatic light of longer wavelength

Answer 216

Decreasing the distance between the screen and the slits

Answer 217

Increasing the distance between the slits

Answer 218

Real and inverted

Answer 219

Real and erect

Answer 220

Virtual and erect

Answer 221

(m – 1) λ

Answer 222

None of these

Answer 223

(m + 1/2)λ

Answer 224

(m – 1/2)λ

Answer 225

Plano-convex

Answer 226

Plano-concave

Answer 227

Convexo-concave

Answer 228

Double-convex

Answer 229

Spherical aberration

Answer 230

All of the above

Answer 231

Chromatic aberration as well as spherical aberration

Answer 232

Chromatic aberration

Answer 233

Horsepower

Answer 234

Longitudinal waves in gas

Answer 235

None of these

Answer 236

Both A and B

Answer 237

Transverse wave in gas

Answer 238

Emission spectrum

Answer 239

All of these

Answer 240

Continuous emission spectrum

Answer 241

Line spectrum

Answer 242

Line absorption spectrum

Answer 243

Band emission spectrum

Answer 244

Band absorption spectrum

Answer 245

Line emission spectrum

Answer 246

The focal length of the objective

Answer 247

The diameter of the objective

Answer 248

The focal length of eyepiece

Answer 249

Two of the above

Answer 250

Reduced intensity of light

Answer 251

Produce polarized light

Answer 252

Increase intensity of light

Answer 253

Produce unpolarised light

Answer 254

(1+fo/fe)L/fo

Answer 255

Ultra-violet rays

Answer 256

Cosmic-rays

Answer 257

Virtual and erect

Answer 258

Real and erect

Answer 259

Virtual and inverted

Answer 260

Real and inverted

Answer 261

Five times shorter than that of eye piece

Answer 262

Shorter than that of eye piece

Answer 263

Equal to that of the eye piece

Answer 264

Greater than that of eye piece

Answer 265

Total internal reflection

Answer 266

Reflection

Answer 267

Dispersion of light

Answer 268

Refraction

Answer 269

1/10 diopter

Answer 270

2/10 diopter

Answer 271

10 diopter

Answer 272

11 diopter

Answer 273

A Plano convex lens (long focal length) and the plane of glass plate

Answer 274

None of these

Answer 275

A Plano convex lens and simple glass sheet

Answer 276

A Plano convex lens and the plane glass plate

Answer 277

4.5 x 10⁸ cm

Answer 278

6.5 x 10⁸

Answer 279

5.5 x 10⁵

Answer 280

2 x 10⁵ ms¯¹

Answer 281

Collimator

Answer 282

Turn table

Answer 283

All of these

Answer 284

Real and inverted

Answer 285

Virtual and Erect

Answer 286

Real and Erect

Answer 287

Virtual and inverted

Answer 288

Housefly will be seen reduced in image

Answer 289

Intensity of image will be increased

Answer 290

Housefly will be seen enlarged in image

Answer 291

Intensity of image will be decreased

Answer 292

In the form of a narrow beam

Answer 293

Electromagnetic

Answer 294

Monochromatic

Answer 295

Incoherent

Answer 296

Length of the telescope

Answer 297

Focal length of eye lens

Answer 298

Focal length of objective lens

Answer 299

Diameter of the objective lens

Answer 300

Refraction

Answer 301

Diffraction

Answer 302

Interference

Answer 303

Reflection

Answer 304

Laser rays propagate in a straight line

Answer 305

Laser rays are most coherent waves

Answer 306

Laser rays are high velocity waves

Answer 307

Laser rays are not absorbed

Answer 308

Yellow-green

Answer 309

Focal length

Answer 310

Principal axis

Answer 311

Radius of curvature

Answer 312

The ratio of the focal length and the diameter

Answer 313

Its focal length

Answer 314

Its magnification

Answer 315

Its diameter (of the objective)

Answer 316

Doppler’s effect

Answer 317

Diffraction

Answer 318

Interference

Answer 319

None of these

Answer 320

None of these

Answer 321

Wavelength

Answer 322

Critical angle

Answer 323

Incidence angle

Answer 324

Refractive angle

Answer 325

Deviation angle

Answer 326

Scattering

Answer 327

Total internal reflection

Answer 328

Refraction

Answer 329

Reflection

Answer 330

Virtual, erect and magnified

Answer 331

Real, erect and magnified

Answer 332

Virtual, inverted and magnified

Answer 333

Virtual, erect and reduced

Answer 334

Sodium light

Answer 335

Quadrupled

Answer 336

25 cm and infinity

Answer 337

0 and infinity

Answer 338

0 and 25 cm

Answer 339

25 cm and 100 cm

Answer 340

Laser rays are not absorbed

Answer 341

Laser rays propagate in a straight line

Answer 342

Laser rays are high velocity waves

Answer 343

Laser rays are most coherent waves

Answer 344

Perpendicular

Answer 345

Diffraction

Answer 346

Reflection

Answer 347

Refraction

Answer 348

Dispersion

Answer 349

Reflection

Answer 350

Refraction

Answer 351

Scattering

Answer 352

Dispersion

Answer 353

Reflection

Answer 354

Refraction

Answer 355

Total internal reflection

Answer 356

Scattering

Answer 357

Elliptical

Answer 358

All types of sources

Answer 359

Search light

Answer 360

Cylindrical source

Answer 361

Isotropic point source

Answer 362

Between f and 2f

Answer 363

Inside the focus

Answer 364

At the focus

Answer 365

All of these

Answer 366

The focal of the eye piece

Answer 367

The least distance of the distinct vision

Answer 368

The focus of the objective lens

Answer 369

Transformer

Answer 370

λ = 2π dm

Answer 371

Band absorption spectrum

Answer 372

Band emission spectrum

Answer 373

Line emission spectrum

Answer 374

Line absorption spectrum

Total Questions:	136
Time Allowed:	60 Minutes
Total Marks:	136
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 Optics Online Mcqs Test

Important Electronics Question and Answer

Physics Optics Practice Test Online With Explanation

Physics

Police

How to Score High in Physics Optics Online Mcqs Test?

Key Preparation Tips:

More Related Resources

Mustansar Khan

Leave a Reply Cancel reply

Important Electronics Question and Answer

Physics Optics Practice Test Online With Explanation

Physics

Police

How to Score High in Physics Optics Online Mcqs Test?

Key Preparation Tips:

More Related Resources

Latest Updates

Mustansar Khan

Leave a Reply Cancel reply