Physics Optics Online Mcqs Test

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Question 1

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

Answer

Different with refractive index of core higher than cladding

Question 2

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

Answer

Dark fringes are thicker than bright

Answer

Equal width

Answer

None of these

Answer

Different width

Question 3

3. For constructive interference the path difference is

Answer

(m – 1) λ

Question 4

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

Answer

Of difference frequencies

Answer

White light

Question 5

5. On a rainy day, if there is an oil drop on tar road, colored rings are seen around this drop. This is because of

Answer

Interference pattern produced due to thin oil film

Answer

Polarization

Answer

Total internal reflection of light

Answer

Diffraction pattern

Question 6

6. Fraunhoffer’s lines commonly visible in the sun’s spectrum are examples of

Answer

Line emission spectrum

Answer

Line absorption spectrum

Answer

Band emission spectrum

Answer

Band absorption spectrum

Question 7

7. 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

Raya may be normal to wave front

Question 8

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

Answer

.m Sin θ = (d + ½)λ

Answer

½ d Sin θ = mλ

Answer

.d Sin θ = (m + ½)λ

Answer

2π Sin θ = (m + ½)λ

Question 9

9. 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 10

10. Wavelength of light of frequency 100 Hz is

Answer

2 x 10⁶ m

Answer

3 x 10⁶ m

Answer

4 x 10⁶ m

Answer

5 x 10⁶ m

Question 11

11. Which of the following is a part of spectrometer?

Answer

All of these

Answer

Turn table

Answer

Collimator

Question 12

12. The separation between successive fringes in a double slit arrangement is x. If the whole arrangement is dipped under water what will be the new fringe separation? [The wavelength of light being used is 5000 A]

Question 13

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

Answer

Energy of different colors is different

Answer

Velocity of different colors is different

Answer

Amplitude of different colors is different

Answer

Phase of different colors is different

Question 14

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

Answer

Monochromatic

Answer

Incoherent

Answer

Electromagnetic

Answer

In the form of a narrow beam

Question 15

15. Near and far points of a healthy human eye respectively are

Answer

25 cm and 100 cm

Answer

0 and infinity

Answer

25 cm and infinity

Answer

0 and 25 cm

Question 16

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

Answer

Origin of spectra

Answer

Diffraction

Answer

Reflection

Answer

Refraction

Question 17

17. Choose the correct statement

Answer

Rays are not normal to wave front

Answer

Rays may be normal to wave front

Answer

There is no relationship between rays and wave fronts

Answer

Rays are normal to wave front

Question 18

18. Finger prints on paper are identified by sprinkling fluorescent powder on it and observing it under

Answer

Sodium light

Question 19

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

Answer

Glass to air

Answer

Water to air

Answer

Water to glass

Answer

Glass to water

Question 20

20. Which does not show polarization?

Answer

None of these

Answer

Both A and B

Answer

Longitudinal waves in gas

Answer

Transverse wave in gas

Question 21

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

Answer

Aperture of the lens

Answer

Radius of curvature of the lens

Answer

Principal focus of the lens

Answer

Pole of the lens

Question 22

22. The fringe spacing in case of blue light

Answer

None of these

Answer

Remains the same

Question 23

23. 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 24

24. Which part of the spectrum is most visible?

Answer

Yellow-green

Question 25

25. Which of the following has least wavelength?

Answer

Cosmic-rays

Answer

Ultra-violet rays

Question 26

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

Question 27

27. In optic fiber transmission system ________ are used regenerate the dim light signal.

Answer

Transformer

Question 28

28. 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 29

29. Final image produced by a compound microscope is

Answer

Virtual and inverted

Answer

Virtual and erect

Answer

Real and erect

Answer

Real and inverted

Question 30

30. Coherent monochromatic light illuminates two narrow parallel slits and the interference pattern that results is observed on a screen some distance beyond the slits. Which modification increases the separation between the dark lines of the interference pattern?

Answer

Using monochromatic light of higher frequency

Answer

Decreasing the distance between the screen and the slits

Answer

Increasing the distance between the slits

Answer

Using monochromatic light of longer wavelength

Question 31

31. 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 32

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

Answer

Between principal focus and optical center

Answer

At the principal focus

Answer

Beyond 2 f

Answer

Between principal focus and center of curvature

Question 33

33. Wavelength of light of frequency 100 Hz is

Answer

5 x 10⁶ m

Answer

3 x 10⁶ m

Answer

2 x 10⁶ m

Answer

4 x 10⁶ m

Question 34

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

Answer

Optical fibers may have homogeneous core with a suitable cladding

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

Question 35

35. While viewing a distant object with a telescope suddenly a housefly sits on objective lens. The correct statement is that

Answer

Intensity of image will be increased

Answer

Housefly will be seen reduced in image

Answer

Intensity of image will be decreased

Answer

Housefly will be seen enlarged in image

Question 36

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

Answer

Band spectrum

Answer

Discontinuous spectrum

Answer

Line spectrum

Answer

Continuous spectrum

Question 37

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

Question 38

38. For destructive interference, the path difference is give by:

Answer

(m – 1/2)λ

Answer

(m + 1/2)λ

Question 39

39. Which of the following features determines the resolving power of telescope?

Answer

The diameter of the objective

Answer

Two of the above

Answer

The focal length of the objective

Answer

The focal length of eyepiece

Question 40

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

Answer

Both b and c

Answer

If the object is within f

Answer

Object is beyond C

Answer

If the object is with in C

Question 41

41. In a astronomical telescope the final image for normal vision is formed at

Answer

The focus of the objective lens

Answer

The focal of the eye piece

Answer

The least distance of the distinct vision

Question 42

42. The revolving power of a lens is given by

Answer

αmin = 1.21 λ/D

Answer

αmin = 1.28 D/λ

Answer

αmin = 1.22 λ/D

Answer

αmin = 1.22 D/λ

Question 43

43. A ________ lens is used to form Newton’s rings:

Answer

Double-convex

Answer

Plano-convex

Answer

Convexo-concave

Answer

Plano-concave

Question 44

44. If an object is placed away from 2f of a converging lens then the image will be

Answer

Real and inverted

Answer

Real and erect

Answer

Virtual and erect

Question 45

45. In Young’s double slit experiment, the separation between the slit is halved and distance between the slit and screen is doubled. The fringe width is

Answer

Quadrupled

Question 46

46. The cause of mirage observed in desert is

Answer

Reflection

Answer

Refraction

Answer

Scattering

Answer

Total internal reflection

Question 47

47. Optic fibers are related with

Answer

None of these

Answer

Communication

Question 48

48. Inverse square law for luminance is valid for

Answer

Search light

Answer

All types of sources

Answer

Isotropic point source

Answer

Cylindrical source

Question 49

49. In the Michelson Interferometer, if m number fringes pass through a reference point when the mirror is moved a distance d, then the wavelength of the light can be found by the formula:

Answer

λ = 2π dm

Question 50

50. When at some angle of incidence, the angle of reflection is equal to 90°. This angle is called

Answer

Incidence angle

Answer

Deviation angle

Answer

Critical angle

Answer

Refractive angle

Question 51

51. What is the main cayuse of the shining of diamond?

Answer

Refraction

Answer

Dispersion of light

Answer

Total internal reflection

Answer

Reflection

Question 52

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

Answer

Refraction

Answer

Interference

Answer

Diffraction

Answer

Reflection

Question 53

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

Answer

fₒ - fₑ

Answer

None of these

Answer

fₑ + fₒ

Answer

fₑ - fₒ

Question 54

54. In a compound microscope, the intermediate image is

Answer

Virtual, inverted and magnified

Answer

Real, erect and magnified

Answer

Virtual, erect and magnified

Answer

Virtual, erect and reduced

Question 55

55. Which of the following is conserved when light waves interfere?

Question 56

56. There is no noticeable boundary between core and cladding

Answer

All types of fiber

Answer

Multi-mode step index fiber

Answer

Single mode step index fiber

Answer

Multi-mode graded index fiber

Question 57

57. The resolving power of a telescope depends on

Answer

The ratio of the focal length and the diameter

Answer

Its diameter (of the objective)

Answer

Its magnification

Answer

Its focal length

Question 58

58. Resolving power of a telescope depends on:

Answer

Diameter of objective lens

Answer

The focal length of objective lens

Answer

Refractive index of objective lens

Answer

The magnification of eyepiece

Question 59

59. In a simple microscope lens used is _________.

Answer

Cylindrical

Answer

Plano convex

Question 60

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

Answer

In the form of a narrow beam

Answer

Electromagnetic

Answer

Incoherent

Answer

Monochromatic

Question 61

61. While viewing a distant object with a telescope suddenly a housefly sits on objective lens. The correct statement is that

Answer

Intensity of image will be decreased

Answer

Housefly will be seen reduced in image

Answer

Housefly will be seen enlarged in image

Answer

Intensity of image will be increased

Question 62

62. When the two surfaces of a thin film are parallel and the light is incident at a certain angle, ________ fringes are formed.

Answer

Elliptical

Question 63

63. The diameter of a lens is called

Answer

Focal length

Answer

Radius of curvature

Answer

Principal axis

Question 64

64. The speed of light in vacuum is 3 x 10⁵ ms¯¹. Its speed in a medium of refractive index 1.5 will be

Answer

5.5 x 10⁵

Answer

2 x 10⁵ ms¯¹

Answer

6.5 x 10⁸

Answer

4.5 x 10⁸ cm

Answer 186

Cosmic-rays

Answer 187

Ultra-violet rays

Answer 188

Any one of these

Answer 189

Dispersion

Answer 190

Interference

Answer 191

Reflection

Answer 192

Scattering

Answer 193

Refraction

Answer 194

Reflection

Answer 195

Dispersion

Answer 196

Produce polarized light

Answer 197

Produce unpolarised light

Answer 198

Reduced intensity of light

Answer 199

Increase intensity of light

Answer 200

Between f and 2 f

Answer 201

At the focus

Answer 202

Wavelength

Answer 203

Total internal reflection

Answer 204

Scattering

Answer 205

Reflection

Answer 206

Refraction

Answer 207

d sin θ = (m + 1/2)

Answer 208

d sin θ = (m + 1)²

Answer 209

d sin θ = (m + 1/2)²

Answer 210

d sin θ = (m + 1/2)⁴

Answer 211

Center of curvature

Answer 212

Optical center

Answer 213

Supersonics

Answer 214

Ultrasonics

Answer 215

Perpendicular

Answer 216

Image is formed at - ∞ and is real

Answer 217

Image is formed at - ∞ and is virtual

Answer 218

Image is formed at + ∞ and is virtual

Answer 219

Image is formed at + ∞ and is real

Answer 220

Magnification

Answer 221

None of these

Answer 222

Light collection

Answer 223

Resolution

Answer 224

Wavelength

Answer 225

Intensity ratio of the sources

Answer 226

Fringe width

Answer 227

Distance between the slits

Answer 228

Diffraction

Answer 229

Refraction

Answer 230

Reflection

Answer 231

Dispersion

Answer 232

Interference

Answer 233

Doppler’s effect

Answer 234

Diffraction

Answer 235

None of these

Answer 236

2/10 diopter

Answer 237

1/10 diopter

Answer 238

10 diopter

Answer 239

11 diopter

Answer 240

The focal of the eye piece

Answer 241

The least distance of the distinct vision

Answer 242

The focus of the objective lens

Answer 243

Emission spectrum

Answer 244

Line spectrum

Answer 245

Continuous emission spectrum

Answer 246

All of these

Answer 247

Wavelength

Answer 248

None of these

Answer 249

Real and Erect

Answer 250

Virtual and inverted

Answer 251

Real and inverted

Answer 252

Virtual and Erect

Answer 253

Neither zero (0) nor one (1)

Answer 254

Both zero (0) and one (1)

Answer 255

Chromatic aberration as well as spherical aberration

Answer 256

Chromatic aberration

Answer 257

Spherical aberration

Answer 258

All of the above

Answer 259

Laser rays are most coherent waves

Answer 260

Laser rays are not absorbed

Answer 261

Laser rays are high velocity waves

Answer 262

Laser rays propagate in a straight line

Answer 263

Resolution of image

Answer 264

Image position

Answer 265

Image size

Answer 266

Any of the above

Answer 267

Wave front

Answer 268

A half-period zone

Answer 269

The focal length of objective lens

Answer 270

Refractive index of objective lens

Answer 271

Diameter of objective lens

Answer 272

The magnification of eyepiece

Answer 273

Real, erect and magnified

Answer 274

Virtual, erect and reduced

Answer 275

Virtual, erect and magnified

Answer 276

Virtual, inverted and magnified

Answer 277

Search light

Answer 278

Cylindrical source

Answer 279

All types of sources

Answer 280

Isotropic point source

Answer 281

Plano concave lens

Answer 282

Plano convex lens

Answer 283

Diverging (or concave) lens

Answer 284

Converging (or convex) lens

Answer 285

Refraction

Answer 286

Diffraction

Answer 287

Interference

Answer 288

Reflection

Answer 289

Cannot be diffracted

Answer 290

Cannot be polarized

Answer 291

Have a lower frequency

Answer 292

Do not affect a photographic plate

Answer 293

Remains unchanged

Answer 294

Gets halved

Answer 295

Of two different frequencies

Answer 296

Coming from opposite direction

Answer 297

Monochromatic

Answer 298

Of high intensity

Answer 299

Line spectrum

Answer 300

Continuous emission spectrum

Answer 301

All of these

Answer 302

Emission spectrum

Answer 303

Horsepower

Answer 304

Five times shorter than that of eye piece

Answer 305

Equal to that of the eye piece

Answer 306

Greater than that of eye piece

Answer 307

Shorter than that of eye piece

Answer 308

(1+fo/fe)L/fo

Answer 309

None of these

Answer 310

Both the object and the final image is at infinity

Answer 311

Only the object is at infinity

Answer 312

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

Answer 313

Only the final image is at infinity

Answer 314

Multi-mode step index fiber

Answer 315

Single mode step index fiber

Answer 316

Mono mode step index fiber

Answer 317

Multi-mode graded index fiber

Answer 318

Image position

Answer 319

Image size

Answer 320

Any of the above

Answer 321

Resolution of image

Answer 322

5 x 10⁸ to 5 x 10¹¹ Hz

Answer 323

5 x 10¹⁴ to 5 x 10¹⁷ Hz

Answer 324

5 x 10¹¹ to 5 x 10¹⁴ Hz

Answer 325

5 x 10⁵ to 5 x 10⁸ Hz

Answer 326

Much larger than the wavelength of light

Answer 327

Of the same order as the wavelength of light

Answer 328

Much smaller than the wavelength of length

Answer 329

Of the order of one millimeter

Answer 330

All of these

Answer 331

At the focus

Answer 332

Inside the focus

Answer 333

Between f and 2f

Answer 334

Diameter of the objective lens

Answer 335

Length of the telescope

Answer 336

Focal length of objective lens

Answer 337

Focal length of eye lens

Answer 338

It is constant at the center

Answer 339

Decreasing gradually

Answer 340

Increasing gradually

Answer 341

None of these

Answer 342

A Plano convex lens and the plane glass plate

Answer 343

None of these

Answer 344

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

Answer 345

A Plano convex lens and simple glass sheet

Answer 346

Glass to air

Answer 347

Water to glass

Answer 348

Water to air

Answer 349

Glass to water

Answer 350

Y = (m+1/2)λd/L

Answer 351

Y = (m+1)λL/d

Answer 352

Y = (m+1/2) dL/λ

Answer 353

Y = (m+1/2)λL/d

Answer 354

Increase with decrease in focal length

Answer 355

List distance of distinct vision

Answer 356

No effect with decrease or increase with focal length

Answer 357

Increase with increase in focal length

Answer 358

None of these

Answer 359

Speed of propagation less than the wave

Answer 360

Speed of propagation greater than wave

Answer 361

Speed of propagation of the wave

Answer 362

None of these

Answer 363

Of same frequency

Answer 364

Different wavelength

Answer 365

Of the same frequency and having definite phase relationship

Answer 366

Of nearly the same frequency

Answer 367

Laser rays are high velocity waves

Answer 368

Laser rays are not absorbed

Answer 369

Laser rays propagate in a straight line

Answer 370

Laser rays are most coherent waves

Answer 371

Band absorption spectrum

Answer 372

Band emission spectrum

Answer 373

Line absorption spectrum

Answer 374

Line emission spectrum

Total Questions:	136
Time Allowed:	60 Minutes
Total Marks:	136
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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