Physics Optics Online Mcqs Test

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Question 1

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

Answer

Monochromatic

Answer

Of two different frequencies

Answer

Of high intensity

Answer

Coming from opposite direction

Question 2

2. The resolving power of a telescope depends on

Answer

Its diameter (of the objective)

Answer

Its magnification

Answer

The ratio of the focal length and the diameter

Answer

Its focal length

Question 3

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

Answer

None of these

Question 4

4. 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 5

5. For the normal setting of a telescope

Answer

Both the object and the final image is at infinity

Answer

Only the final image is at infinity

Answer

Only the object is at infinity

Answer

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

Question 6

6. 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 7

7. 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

Using monochromatic light of longer wavelength

Answer

Increasing the distance between the slits

Answer

Decreasing the distance between the screen and the slits

Question 8

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

Answer

Transformer

Question 9

9. If the magnification M₁ = 20.0 for objective and M₂ = 12.0 then total magnification is

Question 10

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

Question 11

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

Question 12

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

Answer

Diffraction

Answer

Refraction

Answer

Interference

Answer

Reflection

Question 13

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

Question 14

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

Answer

Diffraction

Answer

Refraction

Answer

Reflection

Answer

Dispersion

Question 15

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

Answer

Line absorption spectrum

Answer

Band absorption spectrum

Answer

Line emission spectrum

Answer

Band emission spectrum

Question 16

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

Question 17

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

Question 18

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

Answer

Dispersion of light

Answer

Refraction

Answer

Reflection

Answer

Total internal reflection

Question 19

19. Inverse square law for luminance is valid for

Answer

Search light

Answer

Cylindrical source

Answer

Isotropic point source

Answer

All types of sources

Question 20

20. Magnifying power of simple microscope

Answer

Increase with increase in focal length

Answer

Increase with decrease in focal length

Answer

No effect with decrease or increase with focal length

Answer

List distance of distinct vision

Question 21

21. The velocity of light in vacuum can be changed by changing

Answer

None of these

Answer

Wavelength

Question 22

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

Question 23

23. The cause of mirage observed in desert is

Answer

Refraction

Answer

Total internal reflection

Answer

Reflection

Answer

Scattering

Question 24

24. 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 25

25. 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

Phase of different colors is different

Answer

Energy of different colors is different

Question 26

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

Answer

Line spectrum

Answer

Emission spectrum

Answer

Continuous emission spectrum

Answer

All of these

Question 27

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

Answer

All of these

Answer

Collimator

Answer

Turn table

Question 28

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

Answer

10 diopter

Answer

11 diopter

Answer

2/10 diopter

Answer

1/10 diopter

Question 29

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

Answer

At the principal focus

Answer

Beyond 2 f

Answer

Between principal focus and optical center

Answer

Between principal focus and center of curvature

Question 30

30. A polarizer is used to

Answer

Produce unpolarised light

Answer

Produce polarized light

Answer

Increase intensity of light

Answer

Reduced intensity of light

Question 31

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

Answer

Sodium light

Question 32

32. Unit of power of a lens is

Answer

Horsepower

Question 33

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

Answer

The focal length of eyepiece

Answer

The focal length of the objective

Answer

The diameter of the objective

Answer

Two of the above

Question 34

34. 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 35

35. 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 can be of graded refractive index

Answer

Optical fibers have extremely low transmission loss

Answer

Optical fibers are subject to electromagnetic interference from outside

Question 36

36. 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

2 x 10⁵ ms¯¹

Answer

4.5 x 10⁸ cm

Answer

5.5 x 10⁵

Answer

6.5 x 10⁸

Question 37

37. 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 38

38. 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 39

39. 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 40

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

Answer

Doppler’s effect

Answer

Interference

Answer

None of these

Answer

Diffraction

Question 41

41. 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 42

42. The power of a concave lens is

Question 43

43. Choose the correct statement

Answer

Rays are not normal to wave front

Answer

Raya may be normal to wave front

Answer

There is no relationship between rays and wave fronts

Answer

Rays are normal to wave front

Question 44

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

Answer

Chromatic aberration

Answer

Spherical aberration

Answer

All of the above

Answer

Chromatic aberration as well as spherical aberration

Question 45

45. 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 46

46. The revolving power of a lens is given by

Answer

αmin = 1.28 D/λ

Answer

αmin = 1.21 λ/D

Answer

αmin = 1.22 λ/D

Answer

αmin = 1.22 D/λ

Question 47

47. Resolving power of a telescope depends on:

Answer

The focal length of objective lens

Answer

Diameter of objective lens

Answer

The magnification of eyepiece

Answer

Refractive index of objective lens

Question 48

48. Optic fibers are related with

Answer

Communication

Answer

None of these

Question 49

49. 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

Polarization

Answer

Diffraction pattern

Question 50

50. There is no noticeable boundary between core and cladding

Answer

Multi-mode step index fiber

Answer

Multi-mode graded index fiber

Answer

Single mode step index fiber

Answer

All types of fiber

Question 51

51. The cause of mirage observed in desert is

Answer

Total internal reflection

Answer

Scattering

Answer

Reflection

Answer

Refraction

Question 52

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

Question 53

53. 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 54

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

Answer

Ultrasonics

Answer

Supersonics

Question 55

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

Question 56

56. Which does not show polarization?

Answer

Transverse wave in gas

Answer

None of these

Answer

Longitudinal waves in gas

Answer

Both A and B

Question 57

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

Answer

None of these

Answer

Dark fringes are thicker than bright

Answer

Equal width

Answer

Different width

Question 58

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

Answer

Of difference frequencies

Answer

White light

Question 59

59. Inverse square law for luminance is valid for

Answer

Cylindrical source

Answer

All types of sources

Answer

Search light

Answer

Isotropic point source

Question 60

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

Question 61

61. Sun has elliptical shape, when it rises and sets due to

Answer

Refraction

Answer

Reflection

Answer

Dispersion

Answer

Scattering

Question 62

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

Answer

25 cm and 100 cm

Answer

0 and 25 cm

Answer

25 cm and infinity

Answer

0 and infinity

Question 63

63. The setting of Newton’s rings is

Answer

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

Answer

A Plano convex lens and the plane glass plate

Answer

None of these

Answer

A Plano convex lens and simple glass sheet

Question 64

64. Wavelength of light of frequency 100 Hz is

Answer

3 x 10⁶ m

Answer

5 x 10⁶ m

Answer

4 x 10⁶ m

Answer

2 x 10⁶ m

Answer 181

Plano convex

Answer 182

Cylindrical

Answer 183

Dispersion

Answer 184

Reflection

Answer 185

Interference

Answer 186

Any one of these

Answer 187

Laser rays propagate in a straight line

Answer 188

Laser rays are high velocity waves

Answer 189

Laser rays are most coherent waves

Answer 190

Laser rays are not absorbed

Answer 191

Real and Erect

Answer 192

Real and inverted

Answer 193

Virtual and Erect

Answer 194

Virtual and inverted

Answer 195

Reflection

Answer 196

Origin of spectra

Answer 197

Diffraction

Answer 198

Refraction

Answer 199

Ultra-violet rays

Answer 200

Cosmic-rays

Answer 201

.m Sin θ = (d + ½)λ

Answer 202

2π Sin θ = (m + ½)λ

Answer 203

.d Sin θ = (m + ½)λ

Answer 204

½ d Sin θ = mλ

Answer 205

Image is formed at - ∞ and is real

Answer 206

Image is formed at + ∞ and is virtual

Answer 207

Image is formed at + ∞ and is real

Answer 208

Image is formed at - ∞ and is virtual

Answer 209

Water to glass

Answer 210

Glass to air

Answer 211

Glass to water

Answer 212

Water to air

Answer 213

Real, erect and magnified

Answer 214

Virtual, inverted and magnified

Answer 215

Virtual, erect and magnified

Answer 216

Virtual, erect and reduced

Answer 217

Wavelength

Answer 218

Different with refractive index of core higher than cladding

Answer 219

Center of curvature

Answer 220

Optical center

Answer 221

If the object is with in C

Answer 222

If the object is within f

Answer 223

Object is beyond C

Answer 224

Both b and c

Answer 225

Emission spectrum

Answer 226

Line spectrum

Answer 227

All of these

Answer 228

Continuous emission spectrum

Answer 229

Rays are normal to wave front

Answer 230

Rays may be normal to wave front

Answer 231

Rays are not normal to wave front

Answer 232

There is no relationship between rays and wave fronts

Answer 233

d sin θ = (m + 1)²

Answer 234

d sin θ = (m + 1/2)²

Answer 235

d sin θ = (m + 1/2)⁴

Answer 236

d sin θ = (m + 1/2)

Answer 237

Plano convex lens

Answer 238

Plano concave lens

Answer 239

Diverging (or concave) lens

Answer 240

Converging (or convex) lens

Answer 241

Quadrupled

Answer 242

λ = 2π dm

Answer 243

Neither zero (0) nor one (1)

Answer 244

Both zero (0) and one (1)

Answer 245

Diffraction

Answer 246

Refraction

Answer 247

Reflection

Answer 248

Interference

Answer 249

fₒ - fₑ

Answer 250

fₑ - fₒ

Answer 251

fₑ + fₒ

Answer 252

None of these

Answer 253

Yellow-green

Answer 254

Intensity of image will be decreased

Answer 255

Housefly will be seen enlarged in image

Answer 256

Housefly will be seen reduced in image

Answer 257

Intensity of image will be increased

Answer 258

Cosmic-rays

Answer 259

Ultra-violet rays

Answer 260

Resolution of image

Answer 261

Any of the above

Answer 262

Image size

Answer 263

Image position

Answer 264

It is constant at the center

Answer 265

Decreasing gradually

Answer 266

Increasing gradually

Answer 267

None of these

Answer 268

Length of the telescope

Answer 269

Focal length of objective lens

Answer 270

Diameter of the objective lens

Answer 271

Focal length of eye lens

Answer 272

Intensity of image will be increased

Answer 273

Intensity of image will be decreased

Answer 274

Housefly will be seen enlarged in image

Answer 275

Housefly will be seen reduced in image

Answer 276

A half-period zone

Answer 277

Wave front

Answer 278

The focus of the objective lens

Answer 279

The least distance of the distinct vision

Answer 280

The focal of the eye piece

Answer 281

Discontinuous spectrum

Answer 282

Line spectrum

Answer 283

Continuous spectrum

Answer 284

Band spectrum

Answer 285

At the focus

Answer 286

Between f and 2 f

Answer 287

Monochromatic

Answer 288

Electromagnetic

Answer 289

In the form of a narrow beam

Answer 290

Incoherent

Answer 291

(m – 1) λ

Answer 292

Greater than that of eye piece

Answer 293

Shorter than that of eye piece

Answer 294

Equal to that of the eye piece

Answer 295

Five times shorter than that of eye piece

Answer 296

Cannot be diffracted

Answer 297

Have a lower frequency

Answer 298

Do not affect a photographic plate

Answer 299

Cannot be polarized

Answer 300

The focal of the eye piece

Answer 301

The least distance of the distinct vision

Answer 302

The focus of the objective lens

Answer 303

Real and erect

Answer 304

Real and inverted

Answer 305

Virtual and erect

Answer 306

Laser rays are most coherent waves

Answer 307

Laser rays are high velocity waves

Answer 308

Laser rays propagate in a straight line

Answer 309

Laser rays are not absorbed

Answer 310

Magnification

Answer 311

None of these

Answer 312

Light collection

Answer 313

Resolution

Answer 314

(m + 1/2)λ

Answer 315

(m – 1/2)λ

Answer 316

Convexo-concave

Answer 317

Double-convex

Answer 318

Plano-convex

Answer 319

Plano-concave

Answer 320

Of the same frequency and having definite phase relationship

Answer 321

Different wavelength

Answer 322

Of nearly the same frequency

Answer 323

Of same frequency

Answer 324

Refractive angle

Answer 325

Critical angle

Answer 326

Incidence angle

Answer 327

Deviation angle

Answer 328

Aperture of the lens

Answer 329

Pole of the lens

Answer 330

Radius of curvature of the lens

Answer 331

Principal focus of the lens

Answer 332

Inside the focus

Answer 333

At the focus

Answer 334

All of these

Answer 335

Between f and 2f

Answer 336

Wavelength

Answer 337

Distance between the slits

Answer 338

Fringe width

Answer 339

Intensity ratio of the sources

Answer 340

Remains the same

Answer 341

None of these

Answer 342

Virtual and inverted

Answer 343

Real and erect

Answer 344

Virtual and erect

Answer 345

Real and inverted

Answer 346

Monochromatic

Answer 347

Incoherent

Answer 348

Electromagnetic

Answer 349

In the form of a narrow beam

Answer 350

Focal length

Answer 351

Principal axis

Answer 352

Radius of curvature

Answer 353

5 x 10⁵ to 5 x 10⁸ Hz

Answer 354

5 x 10¹¹ to 5 x 10¹⁴ Hz

Answer 355

5 x 10¹⁴ to 5 x 10¹⁷ Hz

Answer 356

5 x 10⁸ to 5 x 10¹¹ Hz

Answer 357

Single mode step index fiber

Answer 358

Mono mode step index fiber

Answer 359

Multi-mode step index fiber

Answer 360

Multi-mode graded index fiber

Answer 361

(1+fo/fe)L/fo

Answer 362

Of the order of one millimeter

Answer 363

Much smaller than the wavelength of length

Answer 364

Much larger than the wavelength of light

Answer 365

Of the same order as the wavelength of light

Answer 366

Perpendicular

Answer 367

Image size

Answer 368

Image position

Answer 369

Any of the above

Answer 370

Resolution of image

Answer 371

Line emission spectrum

Answer 372

Band emission spectrum

Answer 373

Band absorption spectrum

Answer 374

Line absorption spectrum

Total Questions:	136
Time Allowed:	60 Minutes
Total Marks:	136
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