Physics Optics Online Mcqs Test

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Question 1

1. The inability of the lens to focus all the dispersed colors at one point is called

Answer

Chromatic aberration

Answer

Chromatic aberration as well as spherical aberration

Answer

Spherical aberration

Answer

All of the above

Question 2

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

Answer

Y = (m+1/2)λd/L

Answer

Y = (m+1)λL/d

Answer

Y = (m+1/2) dL/λ

Answer

Y = (m+1/2)λL/d

Question 3

3. 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 4

4. Geometrical optics cannot give following characteristics for a microscope

Answer

Image position

Answer

Image size

Answer

Resolution of image

Answer

Any of the above

Question 5

5. The cause of mirage observed in desert is

Answer

Scattering

Answer

Refraction

Answer

Total internal reflection

Answer

Reflection

Question 6

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

Answer

Line spectrum

Answer

All of these

Answer

Continuous emission spectrum

Answer

Emission spectrum

Question 7

7. 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 8

8. 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

Glass to water

Answer

Water to glass

Answer

Water to air

Question 9

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

Answer

Incidence angle

Answer

Refractive angle

Answer

Critical angle

Answer

Deviation angle

Question 10

10. For obtaining equal and same height, mirror should be

Question 11

11. The fringe spacing in case of blue light

Answer

Remains the same

Answer

None of these

Question 12

12. Optic fibers are related with

Answer

None of these

Answer

Communication

Question 13

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

Answer

Refraction

Answer

Reflection

Answer

Interference

Answer

Diffraction

Question 14

14. Choose the correct statement

Answer

Rays are normal to wave front

Answer

Rays may be normal to wave front

Answer

Rays are not normal to wave front

Answer

There is no relationship between rays and wave fronts

Question 15

15. The resolving power of a telescope depends on

Answer

Its focal length

Answer

The ratio of the focal length and the diameter

Answer

Its diameter (of the objective)

Answer

Its magnification

Question 16

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

Question 17

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

Answer

The focal of the eye piece

Answer

The focus of the objective lens

Answer

The least distance of the distinct vision

Question 18

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

Question 19

19. Intensities of the two waves of light are I and 4l. The maximum intensity of the resultant wave after superposition is

Question 20

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

Answer

Image is formed at + ∞ and is real

Answer

Image is formed at - ∞ and is real

Answer

Image is formed at - ∞ and is virtual

Answer

Image is formed at + ∞ and is virtual

Question 21

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

Answer

10 diopter

Answer

2/10 diopter

Answer

1/10 diopter

Answer

11 diopter

Question 22

22. 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

Total internal reflection of light

Answer

Diffraction pattern

Answer

Polarization

Question 23

23. The cause of mirage observed in desert is

Answer

Reflection

Answer

Total internal reflection

Answer

Scattering

Answer

Refraction

Question 24

24. 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 25

25. 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 26

26. 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

Using monochromatic light of longer wavelength

Answer

Increasing the distance between the slits

Question 27

27. The setting of Newton’s rings is

Answer

None of these

Answer

A Plano convex lens and the plane glass plate

Answer

A Plano convex lens and simple glass sheet

Answer

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

Question 28

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

Question 29

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

Answer

fₑ + fₒ

Answer

fₑ - fₒ

Answer

None of these

Answer

fₒ - fₑ

Question 30

30. 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

Intensity of image will be increased

Answer

Intensity of image will be decreased

Answer

Housefly will be seen enlarged in image

Question 31

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

Answer

If the object is with in C

Answer

Both b and c

Answer

If the object is within f

Answer

Object is beyond C

Question 32

32. 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 33

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

Answer

Convexo-concave

Answer

Plano-concave

Answer

Plano-convex

Answer

Double-convex

Question 34

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

Answer

Band spectrum

Answer

Line spectrum

Answer

Continuous spectrum

Answer

Discontinuous spectrum

Question 35

35. Wavelength of light of frequency 100 Hz is

Answer

5 x 10⁶ m

Answer

3 x 10⁶ m

Answer

4 x 10⁶ m

Answer

2 x 10⁶ m

Question 36

36. 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 37

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

Answer

Multi-mode graded index fiber

Answer

Mono mode step index fiber

Answer

Single mode step index fiber

Answer

Multi-mode step index fiber

Question 38

38. The focal lengths of the eye piece and objective of a telescope are respectively 100 cm and 2 cm. The moon subtends an angle of 0.5° at the eye. If it is looked through the telescope, the angle subtended by the moon’s image will be

Question 39

39. 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 air

Answer

Glass to water

Answer

Water to glass

Question 40

40. 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 41

41. For the normal setting of a telescope

Answer

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

Answer

Both the object and the final image is at infinity

Answer

Only the object is at infinity

Answer

Only the final image is at infinity

Question 42

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

Answer

Diverging (or concave) lens

Answer

Plano concave lens

Answer

Converging (or convex) lens

Answer

Plano convex lens

Question 43

43. The resolving power of telescope depends on

Answer

Focal length of objective lens

Answer

Focal length of eye lens

Answer

Diameter of the objective lens

Answer

Length of the telescope

Question 44

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

Answer

Wavelength

Question 45

45. 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 46

46. The electrical signals change into light signals for transmission through optical fiber. A light pulse represent

Answer

Both zero (0) and one (1)

Answer

Neither zero (0) nor one (1)

Question 47

47. Just before setting, the sun may appear to be elliptical. This happens due to

Answer

Reflection

Answer

Diffraction

Answer

Refraction

Answer

Dispersion

Question 48

48. Magnifying power of simple microscope

Answer

No effect with decrease or increase with focal length

Answer

List distance of distinct vision

Answer

Increase with decrease in focal length

Answer

Increase with increase in focal length

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

Answer

25 cm and 100 cm

Answer

0 and 25 cm

Answer

0 and infinity

Answer

25 cm and infinity

Question 51

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

Answer

Band absorption spectrum

Answer

Line emission spectrum

Answer

Band emission spectrum

Answer

Line absorption spectrum

Question 52

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

Answer

Optical center

Answer

Center of curvature

Question 53

53. 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 54

54. Which is having minimum wavelength?

Answer

Ultra-violet rays

Answer

Cosmic-rays

Question 55

55. Wavelength of light of frequency 100 Hz is

Answer

3 x 10⁶ m

Answer

2 x 10⁶ m

Answer

4 x 10⁶ m

Answer

5 x 10⁶ m

Question 56

56. Unit of power of a lens is

Answer

Horsepower

Question 57

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

Answer

Of the same frequency and having definite phase relationship

Answer

Of same frequency

Answer

Different wavelength

Answer

Of nearly the same frequency

Question 58

58. An object is placed between f and 2f of a concave lens. The image formed will formed will be

Answer

Real and Erect

Answer

Virtual and Erect

Answer

Real and inverted

Answer

Virtual and inverted

Question 59

59. A double convex lens acts as a diverging lens when the object is

Answer

Inside the focus

Answer

Between f and 2f

Answer

All of these

Answer

At the focus

Question 60

60. If a source of light is moving away from stationary observer, then frequency of light wave appears to change because of

Answer

None of these

Answer

Diffraction

Answer

Interference

Answer

Doppler’s effect

Question 61

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

Answer

None of these

Answer

Equal width

Answer

Dark fringes are thicker than bright

Answer

Different width

Question 62

62. In a simple microscope lens used is _________.

Answer

Plano convex

Answer

Cylindrical

Question 63

63. A polarizer is used to

Answer

Produce unpolarised light

Answer

Increase intensity of light

Answer

Reduced intensity of light

Answer

Produce polarized light

Question 64

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

Answer

A half-period zone

Answer

Wave front

Answer 186

Reflection

Answer 187

Interference

Answer 188

Diffraction

Answer 189

Refraction

Answer 190

The focal length of objective lens

Answer 191

Refractive index of objective lens

Answer 192

Diameter of objective lens

Answer 193

The magnification of eyepiece

Answer 194

Resolution of image

Answer 195

Image position

Answer 196

Any of the above

Answer 197

Image size

Answer 198

5 x 10⁵ to 5 x 10⁸ Hz

Answer 199

5 x 10¹⁴ to 5 x 10¹⁷ Hz

Answer 200

5 x 10¹¹ to 5 x 10¹⁴ Hz

Answer 201

5 x 10⁸ to 5 x 10¹¹ Hz

Answer 202

Different with refractive index of core higher than cladding

Answer 203

Sodium light

Answer 204

(m – 1) λ

Answer 205

Laser rays are not absorbed

Answer 206

Laser rays are most coherent waves

Answer 207

Laser rays are high velocity waves

Answer 208

Laser rays propagate in a straight line

Answer 209

Cannot be diffracted

Answer 210

Cannot be polarized

Answer 211

Have a lower frequency

Answer 212

Do not affect a photographic plate

Answer 213

Decreasing gradually

Answer 214

It is constant at the center

Answer 215

Increasing gradually

Answer 216

None of these

Answer 217

Phase of different colors is different

Answer 218

Velocity of different colors is different

Answer 219

Energy of different colors is different

Answer 220

Amplitude of different colors is different

Answer 221

Perpendicular

Answer 222

d sin θ = (m + 1/2)⁴

Answer 223

d sin θ = (m + 1/2)

Answer 224

d sin θ = (m + 1/2)²

Answer 225

d sin θ = (m + 1)²

Answer 226

Refractive index of objective lens

Answer 227

Diameter of objective lens

Answer 228

The magnification of eyepiece

Answer 229

The focal length of objective lens

Answer 230

(1+fo/fe)L/fo

Answer 231

Isotropic point source

Answer 232

Search light

Answer 233

All types of sources

Answer 234

Cylindrical source

Answer 235

Cosmic-rays

Answer 236

Ultra-violet rays

Answer 237

Five times shorter than that of eye piece

Answer 238

Shorter than that of eye piece

Answer 239

Greater than that of eye piece

Answer 240

Equal to that of the eye piece

Answer 241

αmin = 1.22 λ/D

Answer 242

αmin = 1.21 λ/D

Answer 243

αmin = 1.28 D/λ

Answer 244

αmin = 1.22 D/λ

Answer 245

Diffraction

Answer 246

Reflection

Answer 247

Origin of spectra

Answer 248

Refraction

Answer 249

Emission spectrum

Answer 250

All of these

Answer 251

Line spectrum

Answer 252

Continuous emission spectrum

Answer 253

White light

Answer 254

Of difference frequencies

Answer 255

(m + 1/2)λ

Answer 256

(m – 1/2)λ

Answer 257

None of these

Answer 258

Resolution

Answer 259

Magnification

Answer 260

None of these

Answer 261

Light collection

Answer 262

Real, erect and magnified

Answer 263

Virtual, erect and magnified

Answer 264

Virtual, inverted and magnified

Answer 265

Virtual, erect and reduced

Answer 266

The focal length of the objective

Answer 267

Two of the above

Answer 268

The diameter of the objective

Answer 269

The focal length of eyepiece

Answer 270

Of the order of one millimeter

Answer 271

Much larger than the wavelength of light

Answer 272

Much smaller than the wavelength of length

Answer 273

Of the same order as the wavelength of light

Answer 274

Radius of curvature of the lens

Answer 275

Pole of the lens

Answer 276

Principal focus of the lens

Answer 277

Aperture of the lens

Answer 278

Real and erect

Answer 279

Real and inverted

Answer 280

Virtual and erect

Answer 281

2 x 10⁵ ms¯¹

Answer 282

4.5 x 10⁸ cm

Answer 283

6.5 x 10⁸

Answer 284

5.5 x 10⁵

Answer 285

Raya may be normal to wave front

Answer 286

There is no relationship between rays and wave fronts

Answer 287

Rays are not normal to wave front

Answer 288

Rays are normal to wave front

Answer 289

Real, erect and magnified

Answer 290

Virtual, inverted and magnified

Answer 291

Virtual, erect and magnified

Answer 292

Virtual, erect and reduced

Answer 293

Multi-mode step index fiber

Answer 294

All types of fiber

Answer 295

Single mode step index fiber

Answer 296

Multi-mode graded index fiber

Answer 297

Remains unchanged

Answer 298

Gets halved

Answer 299

The focus of the objective lens

Answer 300

The focal of the eye piece

Answer 301

The least distance of the distinct vision

Answer 302

Dispersion

Answer 303

Any one of these

Answer 304

Interference

Answer 305

Reflection

Answer 306

Virtual and inverted

Answer 307

Real and inverted

Answer 308

Virtual and erect

Answer 309

Real and erect

Answer 310

Radius of curvature

Answer 311

Focal length

Answer 312

Principal axis

Answer 313

Intensity of image will be decreased

Answer 314

Intensity of image will be increased

Answer 315

Housefly will be seen reduced in image

Answer 316

Housefly will be seen enlarged in image

Answer 317

Dispersion

Answer 318

Refraction

Answer 319

Reflection

Answer 320

Scattering

Answer 321

Speed of propagation of the wave

Answer 322

Speed of propagation less than the wave

Answer 323

Speed of propagation greater than wave

Answer 324

None of these

Answer 325

Between principal focus and optical center

Answer 326

At the principal focus

Answer 327

Between principal focus and center of curvature

Answer 328

Beyond 2 f

Answer 329

Electromagnetic

Answer 330

In the form of a narrow beam

Answer 331

Incoherent

Answer 332

Monochromatic

Answer 333

All types of sources

Answer 334

Isotropic point source

Answer 335

Search light

Answer 336

Cylindrical source

Answer 337

Laser rays propagate in a straight line

Answer 338

Laser rays are most coherent waves

Answer 339

Laser rays are high velocity waves

Answer 340

Laser rays are not absorbed

Answer 341

Dispersion of light

Answer 342

Refraction

Answer 343

Total internal reflection

Answer 344

Reflection

Answer 345

Longitudinal waves in gas

Answer 346

Transverse wave in gas

Answer 347

None of these

Answer 348

Both A and B

Answer 349

Yellow-green

Answer 350

Collimator

Answer 351

Turn table

Answer 352

All of these

Answer 353

None of these

Answer 354

Supersonics

Answer 355

Ultrasonics

Answer 356

Monochromatic

Answer 357

Of two different frequencies

Answer 358

Of high intensity

Answer 359

Coming from opposite direction

Answer 360

Electromagnetic

Answer 361

Monochromatic

Answer 362

In the form of a narrow beam

Answer 363

Incoherent

Answer 364

Optical fibers may have homogeneous core with a suitable cladding

Answer 365

Optical fibers are subject to electromagnetic interference from outside

Answer 366

Optical fibers can be of graded refractive index

Answer 367

Optical fibers have extremely low transmission loss

Answer 368

Transformer

Answer 369

Wavelength

Answer 370

None of these

Answer 371

Band emission spectrum

Answer 372

Line emission spectrum

Answer 373

Line absorption spectrum

Answer 374

Band 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.
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