Physics Optics Online Mcqs Test

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Question 1

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

Answer

Intensity ratio of the sources

Answer

Wavelength

Answer

Fringe width

Answer

Distance between the slits

Question 2

2. The cause of mirage observed in desert is

Answer

Scattering

Answer

Reflection

Answer

Total internal reflection

Answer

Refraction

Question 3

3. The difference between 1st ring fringe and 1st dark fringe is measured as

Question 4

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

Answer

Pole of the lens

Answer

Aperture of the lens

Answer

Radius of curvature of the lens

Answer

Principal focus of the lens

Question 5

5. 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 6

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

Answer

Refraction

Answer

Diffraction

Answer

Interference

Answer

Reflection

Question 7

7. The resolving power of a telescope depends on

Answer

Its magnification

Answer

Its diameter (of the objective)

Answer

Its focal length

Answer

The ratio of the focal length and the diameter

Question 8

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

Answer

Y = (m+1/2) dL/λ

Answer

Y = (m+1/2)λL/d

Answer

Y = (m+1)λL/d

Answer

Y = (m+1/2)λd/L

Question 9

9. The revolving power of a lens is given by

Answer

αmin = 1.21 λ/D

Answer

αmin = 1.22 D/λ

Answer

αmin = 1.22 λ/D

Answer

αmin = 1.28 D/λ

Question 10

10. 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 11

11. Which part of the spectrum is most visible?

Answer

Yellow-green

Question 12

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

Answer

Line spectrum

Answer

Discontinuous spectrum

Answer

Continuous spectrum

Answer

Band spectrum

Question 13

13. Resolving power of a telescope depends on:

Answer

The magnification of eyepiece

Answer

Refractive index of objective lens

Answer

The focal length of objective lens

Answer

Diameter of objective lens

Question 14

14. The diameter of a lens is called

Answer

Radius of curvature

Answer

Principal axis

Answer

Focal length

Question 15

15. Ray optics is valid, when characteristic dimensions are

Answer

Of the order of one millimeter

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

Question 16

16. The cause of mirage observed in desert is

Answer

Refraction

Answer

Scattering

Answer

Reflection

Answer

Total internal reflection

Question 17

17. Unit of power of a lens is

Answer

Horsepower

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

Answer

Housefly will be seen reduced in image

Answer

Housefly will be seen enlarged in image

Answer

Intensity of image will be decreased

Answer

Intensity of image will be increased

Question 20

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

Answer

Monochromatic

Answer

In the form of a narrow beam

Answer

Electromagnetic

Answer

Incoherent

Question 21

21. If the focal length of objective is 10 mm find its magnification

Question 22

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

Answer

Of two different frequencies

Answer

Coming from opposite direction

Answer

Monochromatic

Answer

Of high intensity

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

Answer

Water to glass

Answer

Water to air

Answer

Glass to air

Answer

Glass to water

Question 25

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

Question 26

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

Answer

Diverging (or concave) lens

Answer

Converging (or convex) lens

Answer

Plano concave lens

Answer

Plano convex lens

Question 27

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

Answer

Ultrasonics

Answer

Supersonics

Question 28

28. Geometrical optics cannot give following characteristics for a microscope

Answer

Image size

Answer

Resolution of image

Answer

Image position

Answer

Any of the above

Question 29

29. The direction of a ray of light is _________ to the wave front.

Answer

Perpendicular

Question 30

30. The power of a concave lens is

Question 31

31. Wavelength of light of frequency 100 Hz is

Answer

2 x 10⁶ m

Answer

4 x 10⁶ m

Answer

5 x 10⁶ m

Answer

3 x 10⁶ m

Question 32

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

Answer

Deviation angle

Answer

Critical angle

Answer

Incidence angle

Answer

Refractive angle

Question 33

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

Answer

d sin θ = (m + 1/2)⁴

Answer

d sin θ = (m + 1/2)²

Answer

d sin θ = (m + 1)²

Answer

d sin θ = (m + 1/2)

Question 34

34. In Young’s double slit experiment, the separation between the slits is made 3 fold, the fringe width becomes

Question 35

35. Wavelength of light of frequency 100 Hz is

Answer

4 x 10⁶ m

Answer

3 x 10⁶ m

Answer

5 x 10⁶ m

Answer

2 x 10⁶ m

Question 36

36. Which of the following has least wavelength?

Answer

Cosmic-rays

Answer

Ultra-violet rays

Question 37

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

Answer

All of these

Answer

Line spectrum

Answer

Continuous emission spectrum

Answer

Emission spectrum

Question 38

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

Answer

The least distance of the distinct vision

Answer

The focus of the objective lens

Answer

The focal of the eye piece

Question 39

39. For constructive interference the path difference is

Answer

(m – 1) λ

Question 40

40. The apparent size of an object depends on the angle subtended but it at the eye. As the angle increases the size of the object

Answer

None of these

Question 41

41. Geometrical optics cannot give following characteristics for a microscope

Answer

Image size

Answer

Image position

Answer

Resolution of image

Answer

Any of the above

Question 42

42. Diopter power of an concave lens of 10 cm focal length is

Answer

1/10 diopter

Answer

11 diopter

Answer

2/10 diopter

Answer

10 diopter

Question 43

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

Answer

Wavelength

Question 44

44. 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

Amplitude of different colors is different

Answer

Energy of different colors is different

Answer

Phase of different colors is different

Question 45

45. 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 46

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

Answer

Continuous emission spectrum

Answer

Line spectrum

Answer

All of these

Answer

Emission spectrum

Question 47

47. In Newton’s rigs the point of contact of the lens and the glass plate, the air film is

Answer

None of these

Question 48

48. For the normal setting of a telescope

Answer

Only the final image is at infinity

Answer

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

Answer

Only the object is at infinity

Answer

Both the object and the final image is at infinity

Question 49

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

Answer

Collimator

Answer

Turn table

Answer

All of these

Question 50

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

Question 51

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

Answer

Different with refractive index of core higher than cladding

Question 52

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

Answer

(m + 1/2)λ

Answer

(m – 1/2)λ

Question 53

53. 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

Diffraction pattern

Answer

Interference pattern produced due to thin oil film

Answer

Polarization

Answer

Total internal reflection of light

Question 54

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

Question 55

55. 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 56

56. 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 10⁵ to 5 x 10⁸ Hz

Answer

5 x 10⁸ to 5 x 10¹¹ Hz

Answer

5 x 10¹¹ to 5 x 10¹⁴ Hz

Answer

5 x 10¹⁴ to 5 x 10¹⁷ Hz

Question 57

57. 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 58

58. 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 59

59. 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 60

60. Magnifying power of simple microscope

Answer

Increase with increase in focal length

Answer

List distance of distinct vision

Answer

No effect with decrease or increase with focal length

Answer

Increase with decrease in focal length

Question 61

61. Soap bubble looks colored due to

Answer

Dispersion

Answer

Any one of these

Answer

Reflection

Answer

Interference

Question 62

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

Answer

The focal length of eyepiece

Answer

The diameter of the objective

Answer

Two of the above

Answer

The focal length of the objective

Question 63

63. 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

Increasing the distance between the slits

Answer

Decreasing the distance between the screen and the slits

Answer

Using monochromatic light of longer wavelength

Answer

Using monochromatic light of higher frequency

Question 64

64. The astronomical telescope consists of objective and eye piece. The focal length of the objective is

Answer

Greater than that of eye piece

Answer

Five times shorter than that of eye piece

Answer

Shorter than that of eye piece

Answer

Equal to that of the eye piece

Answer 171

Rays are not normal to wave front

Answer 172

Rays are normal to wave front

Answer 173

There is no relationship between rays and wave fronts

Answer 174

Rays may be normal to wave front

Answer 175

Water to glass

Answer 176

Glass to air

Answer 177

Water to air

Answer 178

Glass to water

Answer 179

Raya may be normal to wave front

Answer 180

Rays are not normal to wave front

Answer 181

There is no relationship between rays and wave fronts

Answer 182

Rays are normal to wave front

Answer 183

Plano-convex

Answer 184

Plano-concave

Answer 185

Double-convex

Answer 186

Convexo-concave

Answer 187

Remains unchanged

Answer 188

Gets halved

Answer 189

Interference

Answer 190

Diffraction

Answer 191

Doppler’s effect

Answer 192

None of these

Answer 193

Virtual and erect

Answer 194

Real and erect

Answer 195

Virtual and inverted

Answer 196

Real and inverted

Answer 197

White light

Answer 198

Of difference frequencies

Answer 199

Object is beyond C

Answer 200

Both b and c

Answer 201

If the object is within f

Answer 202

If the object is with in C

Answer 203

Refraction

Answer 204

Reflection

Answer 205

Dispersion

Answer 206

Diffraction

Answer 207

Virtual, inverted and magnified

Answer 208

Virtual, erect and reduced

Answer 209

Virtual, erect and magnified

Answer 210

Real, erect and magnified

Answer 211

Have a lower frequency

Answer 212

Cannot be polarized

Answer 213

Do not affect a photographic plate

Answer 214

Cannot be diffracted

Answer 215

Virtual, erect and magnified

Answer 216

Real, erect and magnified

Answer 217

Virtual, erect and reduced

Answer 218

Virtual, inverted and magnified

Answer 219

0 and 25 cm

Answer 220

25 cm and infinity

Answer 221

0 and infinity

Answer 222

25 cm and 100 cm

Answer 223

None of these

Answer 224

Different width

Answer 225

Equal width

Answer 226

Dark fringes are thicker than bright

Answer 227

Refraction

Answer 228

Reflection

Answer 229

Dispersion

Answer 230

Scattering

Answer 231

Mono mode step index fiber

Answer 232

Multi-mode graded index fiber

Answer 233

Single mode step index fiber

Answer 234

Multi-mode step index fiber

Answer 235

fₒ - fₑ

Answer 236

None of these

Answer 237

fₑ - fₒ

Answer 238

fₑ + fₒ

Answer 239

Between f and 2f

Answer 240

All of these

Answer 241

Inside the focus

Answer 242

At the focus

Answer 243

Communication

Answer 244

None of these

Answer 245

All types of sources

Answer 246

Cylindrical source

Answer 247

Search light

Answer 248

Isotropic point source

Answer 249

Neither zero (0) nor one (1)

Answer 250

Both zero (0) and one (1)

Answer 251

Chromatic aberration as well as spherical aberration

Answer 252

All of the above

Answer 253

Spherical aberration

Answer 254

Chromatic aberration

Answer 255

None of these

Answer 256

Speed of propagation greater than wave

Answer 257

Speed of propagation less than the wave

Answer 258

Speed of propagation of the wave

Answer 259

None of these

Answer 260

Remains the same

Answer 261

Wavelength

Answer 262

None of these

Answer 263

Housefly will be seen enlarged in image

Answer 264

Intensity of image will be increased

Answer 265

Housefly will be seen reduced in image

Answer 266

Intensity of image will be decreased

Answer 267

.m Sin θ = (d + ½)λ

Answer 268

2π Sin θ = (m + ½)λ

Answer 269

½ d Sin θ = mλ

Answer 270

.d Sin θ = (m + ½)λ

Answer 271

Line emission spectrum

Answer 272

Band absorption spectrum

Answer 273

Band emission spectrum

Answer 274

Line absorption spectrum

Answer 275

Different wavelength

Answer 276

Of the same frequency and having definite phase relationship

Answer 277

Of nearly the same frequency

Answer 278

Of same frequency

Answer 279

Wave front

Answer 280

A half-period zone

Answer 281

Between principal focus and optical center

Answer 282

Beyond 2 f

Answer 283

At the principal focus

Answer 284

Between principal focus and center of curvature

Answer 285

Transformer

Answer 286

None of these

Answer 287

Longitudinal waves in gas

Answer 288

Both A and B

Answer 289

Transverse wave in gas

Answer 290

Ultra-violet rays

Answer 291

Cosmic-rays

Answer 292

Length of the telescope

Answer 293

Focal length of eye lens

Answer 294

Diameter of the objective lens

Answer 295

Focal length of objective lens

Answer 296

The focus of the objective lens

Answer 297

The least distance of the distinct vision

Answer 298

The focal of the eye piece

Answer 299

Refraction

Answer 300

Reflection

Answer 301

Interference

Answer 302

Diffraction

Answer 303

Real and inverted

Answer 304

Virtual and inverted

Answer 305

Real and Erect

Answer 306

Virtual and Erect

Answer 307

Reduced intensity of light

Answer 308

Produce polarized light

Answer 309

Produce unpolarised light

Answer 310

Increase intensity of light

Answer 311

Image is formed at + ∞ and is real

Answer 312

Image is formed at - ∞ and is real

Answer 313

Image is formed at + ∞ and is virtual

Answer 314

Image is formed at - ∞ and is virtual

Answer 315

Optical fibers may have homogeneous core with a suitable cladding

Answer 316

Optical fibers are subject to electromagnetic interference from outside

Answer 317

Optical fibers can be of graded refractive index

Answer 318

Optical fibers have extremely low transmission loss

Answer 319

Dispersion of light

Answer 320

Reflection

Answer 321

Refraction

Answer 322

Total internal reflection

Answer 323

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

Answer 324

None of these

Answer 325

A Plano convex lens and the plane glass plate

Answer 326

A Plano convex lens and simple glass sheet

Answer 327

2 x 10⁵ ms¯¹

Answer 328

5.5 x 10⁵

Answer 329

4.5 x 10⁸ cm

Answer 330

6.5 x 10⁸

Answer 331

Refractive index of objective lens

Answer 332

Diameter of objective lens

Answer 333

The magnification of eyepiece

Answer 334

The focal length of objective lens

Answer 335

It is constant at the center

Answer 336

None of these

Answer 337

Decreasing gradually

Answer 338

Increasing gradually

Answer 339

Search light

Answer 340

All types of sources

Answer 341

Isotropic point source

Answer 342

Cylindrical source

Answer 343

Sodium light

Answer 344

(1+fo/fe)L/fo

Answer 345

Plano convex

Answer 346

Cylindrical

Answer 347

Multi-mode graded index fiber

Answer 348

All types of fiber

Answer 349

Multi-mode step index fiber

Answer 350

Single mode step index fiber

Answer 351

Monochromatic

Answer 352

Incoherent

Answer 353

In the form of a narrow beam

Answer 354

Electromagnetic

Answer 355

Origin of spectra

Answer 356

Refraction

Answer 357

Reflection

Answer 358

Diffraction

Answer 359

Laser rays are most coherent waves

Answer 360

Laser rays are high velocity waves

Answer 361

Laser rays propagate in a straight line

Answer 362

Laser rays are not absorbed

Answer 363

Laser rays are high velocity waves

Answer 364

Laser rays are not absorbed

Answer 365

Laser rays propagate in a straight line

Answer 366

Laser rays are most coherent waves

Answer 367

None of these

Answer 368

Magnification

Answer 369

Light collection

Answer 370

Resolution

Answer 371

Line absorption spectrum

Answer 372

Line emission spectrum

Answer 373

Band absorption spectrum

Answer 374

Band 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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