Physics Optics Online Mcqs Test

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Question 1

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

Question 2

2. Resolving power of a telescope depends on:

Answer

Refractive index of objective lens

Answer

The focal length of objective lens

Answer

Diameter of objective lens

Answer

The magnification of eyepiece

Question 3

3. Why laser rays are used to measure long distance?

Answer

Laser rays are most coherent waves

Answer

Laser rays are not absorbed

Answer

Laser rays are high velocity waves

Answer

Laser rays propagate in a straight line

Question 4

4. In 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 5

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

Answer

Refractive angle

Answer

Deviation angle

Answer

Incidence angle

Answer

Critical angle

Question 6

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

Answer

Real and erect

Answer

Real and inverted

Answer

Virtual and erect

Question 7

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

Question 8

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

Answer

Between f and 2 f

Answer

At the focus

Question 9

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

Answer

0 and infinity

Answer

0 and 25 cm

Answer

25 cm and 100 cm

Answer

25 cm and infinity

Question 10

10. 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 11

11. Which of the following has least wavelength?

Answer

Ultra-violet rays

Answer

Cosmic-rays

Question 12

12. 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 13

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

Answer

Reflection

Answer

Refraction

Answer

Diffraction

Answer

Interference

Question 14

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

Answer

Band emission spectrum

Answer

Line emission spectrum

Answer

Line absorption spectrum

Answer

Band absorption spectrum

Question 15

15. Image of an object 5 mm high is only 1 cm high, Magnification produced by lens is

Question 16

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

Answer

None of these

Answer

fₑ - fₒ

Answer

fₑ + fₒ

Answer

fₒ - fₑ

Question 17

17. Soap bubble looks colored due to

Answer

Reflection

Answer

Dispersion

Answer

Interference

Answer

Any one of these

Question 18

18. 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 19

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

Question 20

20. The cause of mirage observed in desert is

Answer

Reflection

Answer

Total internal reflection

Answer

Refraction

Answer

Scattering

Question 21

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

Answer

Interference

Answer

Doppler’s effect

Answer

Diffraction

Answer

None of these

Question 22

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

Question 23

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

Answer

Different with refractive index of core higher than cladding

Question 24

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

Answer

Refraction

Answer

Dispersion of light

Answer

Total internal reflection

Answer

Reflection

Question 25

25. 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 26

26. The cause of mirage observed in desert is

Answer

Refraction

Answer

Reflection

Answer

Total internal reflection

Answer

Scattering

Question 27

27. 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 28

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

Answer

Continuous emission spectrum

Answer

Emission spectrum

Answer

Line spectrum

Answer

All of these

Question 29

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

Answer

All of these

Answer

Emission spectrum

Answer

Continuous emission spectrum

Answer

Line spectrum

Question 30

30. Resolving power of a telescope depends on:

Answer

Diameter of objective lens

Answer

The magnification of eyepiece

Answer

The focal length of objective lens

Answer

Refractive index of objective lens

Question 31

31. 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 step index fiber

Answer

Mono mode step index fiber

Answer

Multi-mode graded index fiber

Question 32

32. 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 water

Answer

Glass to air

Question 33

33. 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 10¹⁴ to 5 x 10¹⁷ Hz

Answer

5 x 10¹¹ to 5 x 10¹⁴ Hz

Answer

5 x 10⁵ to 5 x 10⁸ Hz

Question 34

34. Ray optics is valid, when characteristic dimensions are

Answer

Much smaller than the wavelength of length

Answer

Much larger than the wavelength of light

Answer

Of the same order as the wavelength of light

Answer

Of the order of one millimeter

Question 35

35. Inverse square law for luminance is valid for

Answer

Isotropic point source

Answer

Search light

Answer

All types of sources

Answer

Cylindrical source

Question 36

36. The resolving power of a telescope depends on

Answer

Its diameter (of the objective)

Answer

Its focal length

Answer

Its magnification

Answer

The ratio of the focal length and the diameter

Question 37

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

Answer

Discontinuous spectrum

Answer

Band spectrum

Answer

Continuous spectrum

Answer

Line spectrum

Question 38

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

Answer

Equal width

Answer

Dark fringes are thicker than bright

Answer

None of these

Answer

Different width

Question 39

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

Answer

Refraction

Answer

Reflection

Answer

Diffraction

Answer

Interference

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 greater than wave

Answer

None of these

Answer

Speed of propagation of the wave

Question 41

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

Answer

Diffraction

Answer

Reflection

Answer

Dispersion

Answer

Refraction

Question 42

42. 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 43

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

Answer

(m + 1/2)λ

Answer

(m – 1/2)λ

Question 44

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

Answer

Neither zero (0) nor one (1)

Answer

Both zero (0) and one (1)

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. The fringe spacing in case of blue light

Answer

Remains the same

Answer

None of these

Question 47

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

Answer

Perpendicular

Question 48

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

Answer

Do not affect a photographic plate

Answer

Cannot be diffracted

Answer

Have a lower frequency

Answer

Cannot be polarized

Question 49

49. Magnification of the astronomical telescope is

Answer

(1+fo/fe)L/fo

Question 50

50. The diameter of a lens is called

Answer

Radius of curvature

Answer

Focal length

Answer

Principal axis

Question 51

51. 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 inverted

Answer

Virtual and Erect

Answer

Real and inverted

Question 52

52. 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 enlarged in image

Answer

Housefly will be seen reduced in image

Answer

Intensity of image will be decreased

Answer

Intensity of image will be increased

Question 53

53. Geometrical optics cannot give following characteristics for a microscope

Answer

Resolution of image

Answer

Image position

Answer

Any of the above

Answer

Image size

Question 54

54. Inverse square law for luminance is valid for

Answer

All types of sources

Answer

Isotropic point source

Answer

Search light

Answer

Cylindrical source

Question 55

55. Geometrical optics cannot give following characteristics for a microscope

Answer

Image size

Answer

Any of the above

Answer

Resolution of image

Answer

Image position

Question 56

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

Question 57

57. 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 58

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

Answer

Spherical aberration

Answer

All of the above

Answer

Chromatic aberration as well as spherical aberration

Answer

Chromatic aberration

Question 59

59. What is the most important function of telescope?

Answer

Magnification

Answer

None of these

Answer

Resolution

Answer

Light collection

Question 60

60. 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 61

61. 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 62

62. If the distance of a surface from light source is doubled, then the luminance will become

Question 63

63. Which part of the spectrum is most visible?

Answer

Yellow-green

Question 64

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

Answer

The diameter of the objective

Answer

The focal length of the objective

Answer

The focal length of eyepiece

Answer

Two of the above

Answer 184

Cylindrical

Answer 185

Plano convex

Answer 186

5.5 x 10⁵

Answer 187

6.5 x 10⁸

Answer 188

4.5 x 10⁸ cm

Answer 189

2 x 10⁵ ms¯¹

Answer 190

2 x 10⁶ m

Answer 191

4 x 10⁶ m

Answer 192

3 x 10⁶ m

Answer 193

5 x 10⁶ m

Answer 194

(m – 1) λ

Answer 195

None of these

Answer 196

Five times shorter than that of eye piece

Answer 197

Greater than that of eye piece

Answer 198

Shorter than that of eye piece

Answer 199

Equal to that of the eye piece

Answer 200

Between principal focus and optical center

Answer 201

Between principal focus and center of curvature

Answer 202

At the principal focus

Answer 203

Beyond 2 f

Answer 204

Monochromatic

Answer 205

In the form of a narrow beam

Answer 206

Electromagnetic

Answer 207

Incoherent

Answer 208

Optical fibers may have homogeneous core with a suitable cladding

Answer 209

Optical fibers are subject to electromagnetic interference from outside

Answer 210

Optical fibers have extremely low transmission loss

Answer 211

Optical fibers can be of graded refractive index

Answer 212

None of these

Answer 213

Wavelength

Answer 214

If the object is within f

Answer 215

If the object is with in C

Answer 216

Both b and c

Answer 217

Object is beyond C

Answer 218

Optical center

Answer 219

Center of curvature

Answer 220

d sin θ = (m + 1/2)²

Answer 221

d sin θ = (m + 1/2)

Answer 222

d sin θ = (m + 1/2)⁴

Answer 223

d sin θ = (m + 1)²

Answer 224

Incoherent

Answer 225

In the form of a narrow beam

Answer 226

Electromagnetic

Answer 227

Monochromatic

Answer 228

Velocity of different colors is different

Answer 229

Amplitude of different colors is different

Answer 230

Energy of different colors is different

Answer 231

Phase of different colors is different

Answer 232

All types of fiber

Answer 233

Multi-mode graded index fiber

Answer 234

Single mode step index fiber

Answer 235

Multi-mode step index fiber

Answer 236

Decreasing gradually

Answer 237

It is constant at the center

Answer 238

None of these

Answer 239

Increasing gradually

Answer 240

Total internal reflection of light

Answer 241

Polarization

Answer 242

Diffraction pattern

Answer 243

Interference pattern produced due to thin oil film

Answer 244

Cosmic-rays

Answer 245

Ultra-violet rays

Answer 246

Communication

Answer 247

None of these

Answer 248

Wavelength

Answer 249

Sodium light

Answer 250

Virtual, inverted and magnified

Answer 251

Virtual, erect and reduced

Answer 252

Virtual, erect and magnified

Answer 253

Real, erect and magnified

Answer 254

Aperture of the lens

Answer 255

Pole of the lens

Answer 256

Radius of curvature of the lens

Answer 257

Principal focus of the lens

Answer 258

Transformer

Answer 259

Convexo-concave

Answer 260

Double-convex

Answer 261

Plano-concave

Answer 262

Plano-convex

Answer 263

A Plano convex lens and the plane glass plate

Answer 264

None of these

Answer 265

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

Answer 266

A Plano convex lens and simple glass sheet

Answer 267

Rays are normal to wave front

Answer 268

Raya may be normal to wave front

Answer 269

Rays are not normal to wave front

Answer 270

There is no relationship between rays and wave fronts

Answer 271

Length of the telescope

Answer 272

Diameter of the objective lens

Answer 273

Focal length of eye lens

Answer 274

Focal length of objective lens

Answer 275

Produce unpolarised light

Answer 276

Produce polarized light

Answer 277

Reduced intensity of light

Answer 278

Increase intensity of light

Answer 279

Diverging (or concave) lens

Answer 280

Plano concave lens

Answer 281

Converging (or convex) lens

Answer 282

Plano convex lens

Answer 283

Rays are normal to wave front

Answer 284

There is no relationship between rays and wave fronts

Answer 285

Rays are not normal to wave front

Answer 286

Rays may be normal to wave front

Answer 287

Of difference frequencies

Answer 288

White light

Answer 289

4 x 10⁶ m

Answer 290

3 x 10⁶ m

Answer 291

5 x 10⁶ m

Answer 292

2 x 10⁶ m

Answer 293

Gets halved

Answer 294

Remains unchanged

Answer 295

None of these

Answer 296

Reflection

Answer 297

Refraction

Answer 298

Dispersion

Answer 299

Scattering

Answer 300

Quadrupled

Answer 301

Transverse wave in gas

Answer 302

Longitudinal waves in gas

Answer 303

None of these

Answer 304

Both A and B

Answer 305

1/10 diopter

Answer 306

10 diopter

Answer 307

2/10 diopter

Answer 308

11 diopter

Answer 309

Housefly will be seen reduced in image

Answer 310

Housefly will be seen enlarged in image

Answer 311

Intensity of image will be increased

Answer 312

Intensity of image will be decreased

Answer 313

Supersonics

Answer 314

Ultrasonics

Answer 315

λ = 2π dm

Answer 316

2π Sin θ = (m + ½)λ

Answer 317

½ d Sin θ = mλ

Answer 318

.m Sin θ = (d + ½)λ

Answer 319

.d Sin θ = (m + ½)λ

Answer 320

Monochromatic

Answer 321

Of two different frequencies

Answer 322

Coming from opposite direction

Answer 323

Of high intensity

Answer 324

All of these

Answer 325

Collimator

Answer 326

Turn table

Answer 327

Virtual and inverted

Answer 328

Virtual and erect

Answer 329

Real and inverted

Answer 330

Real and erect

Answer 331

Of same frequency

Answer 332

Of nearly the same frequency

Answer 333

Of the same frequency and having definite phase relationship

Answer 334

Different wavelength

Answer 335

All of these

Answer 336

Inside the focus

Answer 337

At the focus

Answer 338

Between f and 2f

Answer 339

Origin of spectra

Answer 340

Refraction

Answer 341

Reflection

Answer 342

Diffraction

Answer 343

The focus of the objective lens

Answer 344

The focal of the eye piece

Answer 345

The least distance of the distinct vision

Answer 346

Horsepower

Answer 347

Y = (m+1)λL/d

Answer 348

Y = (m+1/2)λd/L

Answer 349

Y = (m+1/2) dL/λ

Answer 350

Y = (m+1/2)λL/d

Answer 351

Fringe width

Answer 352

Wavelength

Answer 353

Intensity ratio of the sources

Answer 354

Distance between the slits

Answer 355

Laser rays are most coherent waves

Answer 356

Laser rays propagate in a straight line

Answer 357

Laser rays are high velocity waves

Answer 358

Laser rays are not absorbed

Answer 359

Using monochromatic light of higher frequency

Answer 360

Using monochromatic light of longer wavelength

Answer 361

Decreasing the distance between the screen and the slits

Answer 362

Increasing the distance between the slits

Answer 363

αmin = 1.28 D/λ

Answer 364

αmin = 1.22 λ/D

Answer 365

αmin = 1.21 λ/D

Answer 366

αmin = 1.22 D/λ

Answer 367

Virtual, erect and magnified

Answer 368

Real, erect and magnified

Answer 369

Virtual, inverted and magnified

Answer 370

Virtual, erect and reduced

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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