Physics Optics Online Mcqs Test

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Question 1

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

Answer

Convexo-concave

Answer

Double-convex

Answer

Plano-concave

Answer

Plano-convex

Question 2

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

Answer

Diffraction

Answer

Reflection

Answer

Refraction

Answer

Origin of spectra

Question 3

3. 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 4

4. 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 5

5. Critical angle of light passing from glass to air is minimum for

Question 6

6. In a compound microscope, the intermediate image is

Answer

Virtual, inverted and magnified

Answer

Virtual, erect and reduced

Answer

Real, erect and magnified

Answer

Virtual, erect and magnified

Question 7

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

Question 8

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

Question 9

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

Answer

Between principal focus and center of curvature

Answer

Beyond 2 f

Answer

At the principal focus

Answer

Between principal focus and optical center

Question 10

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

Answer

Wavelength

Answer

None of these

Question 11

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

Question 12

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

Answer

.m Sin θ = (d + ½)λ

Answer

.d Sin θ = (m + ½)λ

Answer

½ d Sin θ = mλ

Answer

2π Sin θ = (m + ½)λ

Question 13

13. 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 14

14. 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 15

15. 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 16

16. 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 17

17. 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 18

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

Answer

Both b and c

Answer

Object is beyond C

Answer

If the object is with in C

Answer

If the object is within f

Question 19

19. Magnification of the astronomical telescope is

Answer

(1+fo/fe)L/fo

Question 20

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

Answer

(m + 1/2)λ

Answer

(m – 1/2)λ

Question 21

21. 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

4.5 x 10⁸ cm

Answer

6.5 x 10⁸

Answer

2 x 10⁵ ms¯¹

Question 22

22. For constructive interference the path difference is

Answer

(m – 1) λ

Question 23

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

Answer

Line emission spectrum

Answer

Line absorption spectrum

Answer

Band absorption spectrum

Answer

Band emission spectrum

Question 24

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

Answer

Reflection

Answer

Total internal reflection

Answer

Refraction

Answer

Dispersion of light

Question 25

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

Answer

Monochromatic

Answer

Of high intensity

Answer

Of two different frequencies

Answer

Coming from opposite direction

Question 26

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

Question 27

27. What is the most important function of telescope?

Answer

Light collection

Answer

None of these

Answer

Resolution

Answer

Magnification

Question 28

28. 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 29

29. 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 30

30. Unit of power of a lens is

Answer

Horsepower

Question 31

31. 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 32

32. In a compound microscope, the intermediate image is

Answer

Virtual, erect and magnified

Answer

Virtual, erect and reduced

Answer

Real, erect and magnified

Answer

Virtual, inverted and magnified

Question 33

33. 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 34

34. The cause of mirage observed in desert is

Answer

Scattering

Answer

Refraction

Answer

Reflection

Answer

Total internal reflection

Question 35

35. Resolving power of a telescope depends on:

Answer

Diameter of objective lens

Answer

Refractive index of objective lens

Answer

The magnification of eyepiece

Answer

The focal length of objective lens

Question 36

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

Answer

None of these

Question 37

37. Which part of the spectrum is most visible?

Answer

Yellow-green

Question 38

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

Question 39

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

Answer

Laser rays are high velocity waves

Answer

Laser rays are most coherent waves

Answer

Laser rays propagate in a straight line

Answer

Laser rays are not absorbed

Question 40

40. 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 41

41. In a 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 42

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

Answer

Glass to water

Answer

Water to glass

Answer

Glass to air

Answer

Water to air

Question 43

43. Which of the following has least wavelength?

Answer

Cosmic-rays

Answer

Ultra-violet rays

Question 44

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

Question 45

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

Answer

d sin θ = (m + 1/2)²

Answer

d sin θ = (m + 1/2)⁴

Answer

d sin θ = (m + 1/2)

Answer

d sin θ = (m + 1)²

Question 46

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

Answer

Of nearly the same frequency

Answer

Different wavelength

Answer

Of same frequency

Answer

Of the same frequency and having definite phase relationship

Question 47

47. 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

Decreasing the distance between the screen and the slits

Answer

Using monochromatic light of longer wavelength

Answer

Increasing the distance between the slits

Answer

Using monochromatic light of higher frequency

Question 48

48. 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 49

49. Huygen’s wave fronts which sends out secondary wavelets with a speed equal to

Answer

Speed of propagation of the wave

Answer

Speed of propagation greater than wave

Answer

Speed of propagation less than the wave

Answer

None of these

Question 50

50. Due to Plano convex lens and the plane glass plate the thickness of air film changes from the center to outward

Answer

None of these

Answer

Decreasing gradually

Answer

It is constant at the center

Answer

Increasing gradually

Question 51

51. 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 52

52. Inverse square law for luminance is valid for

Answer

Cylindrical source

Answer

Isotropic point source

Answer

Search light

Answer

All types of sources

Question 53

53. 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 54

54. The resolving power of telescope depends on

Answer

Length of the telescope

Answer

Diameter of the objective lens

Answer

Focal length of objective lens

Answer

Focal length of eye lens

Question 55

55. 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 56

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

Answer

Real and inverted

Answer

Virtual and erect

Answer

Real and erect

Question 57

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

Question 58

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

Answer

Discontinuous spectrum

Answer

Line spectrum

Answer

Band spectrum

Answer

Continuous spectrum

Question 59

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

Answer

Diffraction

Answer

Doppler’s effect

Answer

Interference

Answer

None of these

Question 60

60. Geometrical optics cannot give following characteristics for a microscope

Answer

Resolution of image

Answer

Image size

Answer

Image position

Answer

Any of the above

Question 61

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

Question 62

62. 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

Virtual and inverted

Answer

Real and inverted

Question 63

63. 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

Housefly will be seen enlarged in image

Answer

Intensity of image will be decreased

Question 64

64. Optic fibers are related with

Answer

Communication

Answer

None of these

Answer 165

Glass to air

Answer 166

Water to air

Answer 167

Glass to water

Answer 168

Water to glass

Answer 169

At the focus

Answer 170

Between f and 2 f

Answer 171

Virtual and inverted

Answer 172

Virtual and erect

Answer 173

Real and erect

Answer 174

Real and inverted

Answer 175

λ = 2π dm

Answer 176

Of difference frequencies

Answer 177

White light

Answer 178

5 x 10¹¹ to 5 x 10¹⁴ Hz

Answer 179

5 x 10¹⁴ to 5 x 10¹⁷ Hz

Answer 180

5 x 10⁸ to 5 x 10¹¹ Hz

Answer 181

5 x 10⁵ to 5 x 10⁸ Hz

Answer 182

Housefly will be seen reduced in image

Answer 183

Housefly will be seen enlarged in image

Answer 184

Intensity of image will be increased

Answer 185

Intensity of image will be decreased

Answer 186

Shorter than that of eye piece

Answer 187

Greater than that of eye piece

Answer 188

Five times shorter than that of eye piece

Answer 189

Equal to that of the eye piece

Answer 190

Both the object and the final image is at infinity

Answer 191

Only the final image is at infinity

Answer 192

Only the object is at infinity

Answer 193

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

Answer 194

Produce unpolarised light

Answer 195

Increase intensity of light

Answer 196

Reduced intensity of light

Answer 197

Produce polarized light

Answer 198

Distance between the slits

Answer 199

Fringe width

Answer 200

Wavelength

Answer 201

Intensity ratio of the sources

Answer 202

Y = (m+1/2) dL/λ

Answer 203

Y = (m+1/2)λd/L

Answer 204

Y = (m+1/2)λL/d

Answer 205

Y = (m+1)λL/d

Answer 206

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

Answer 207

None of these

Answer 208

A Plano convex lens and the plane glass plate

Answer 209

A Plano convex lens and simple glass sheet

Answer 210

0 and infinity

Answer 211

25 cm and infinity

Answer 212

0 and 25 cm

Answer 213

25 cm and 100 cm

Answer 214

Mono mode step index fiber

Answer 215

Multi-mode graded index fiber

Answer 216

Multi-mode step index fiber

Answer 217

Single mode step index fiber

Answer 218

2 x 10⁶ m

Answer 219

3 x 10⁶ m

Answer 220

5 x 10⁶ m

Answer 221

4 x 10⁶ m

Answer 222

None of these

Answer 223

Remains the same

Answer 224

Raya may be normal to wave front

Answer 225

Rays are not normal to wave front

Answer 226

Rays are normal to wave front

Answer 227

There is no relationship between rays and wave fronts

Answer 228

Two of the above

Answer 229

The focal length of the objective

Answer 230

The diameter of the objective

Answer 231

The focal length of eyepiece

Answer 232

Image is formed at + ∞ and is real

Answer 233

Image is formed at - ∞ and is virtual

Answer 234

Image is formed at + ∞ and is virtual

Answer 235

Image is formed at - ∞ and is real

Answer 236

Both A and B

Answer 237

Longitudinal waves in gas

Answer 238

Transverse wave in gas

Answer 239

None of these

Answer 240

Plano concave lens

Answer 241

Diverging (or concave) lens

Answer 242

Plano convex lens

Answer 243

Converging (or convex) lens

Answer 244

Wavelength

Answer 245

Monochromatic

Answer 246

In the form of a narrow beam

Answer 247

Electromagnetic

Answer 248

Incoherent

Answer 249

2 x 10⁶ m

Answer 250

5 x 10⁶ m

Answer 251

3 x 10⁶ m

Answer 252

4 x 10⁶ m

Answer 253

Different with refractive index of core higher than cladding

Answer 254

Both zero (0) and one (1)

Answer 255

Neither zero (0) nor one (1)

Answer 256

The least distance of the distinct vision

Answer 257

The focus of the objective lens

Answer 258

The focal of the eye piece

Answer 259

Optical fibers have extremely low transmission loss

Answer 260

Optical fibers may have homogeneous core with a suitable cladding

Answer 261

Optical fibers can be of graded refractive index

Answer 262

Optical fibers are subject to electromagnetic interference from outside

Answer 263

Cosmic-rays

Answer 264

Ultra-violet rays

Answer 265

All of these

Answer 266

Inside the focus

Answer 267

At the focus

Answer 268

Between f and 2f

Answer 269

Laser rays are high velocity waves

Answer 270

Laser rays are most coherent waves

Answer 271

Laser rays are not absorbed

Answer 272

Laser rays propagate in a straight line

Answer 273

Cylindrical

Answer 274

Plano convex

Answer 275

Have a lower frequency

Answer 276

Cannot be diffracted

Answer 277

Do not affect a photographic plate

Answer 278

Cannot be polarized

Answer 279

Reflection

Answer 280

Dispersion

Answer 281

Any one of these

Answer 282

Interference

Answer 283

Total internal reflection

Answer 284

Refraction

Answer 285

Scattering

Answer 286

Reflection

Answer 287

Center of curvature

Answer 288

Optical center

Answer 289

All types of sources

Answer 290

Cylindrical source

Answer 291

Isotropic point source

Answer 292

Search light

Answer 293

Rays are not normal to wave front

Answer 294

There is no relationship between rays and wave fronts

Answer 295

Rays are normal to wave front

Answer 296

Rays may be normal to wave front

Answer 297

Diameter of objective lens

Answer 298

The focal length of objective lens

Answer 299

Refractive index of objective lens

Answer 300

The magnification of eyepiece

Answer 301

Transformer

Answer 302

Elliptical

Answer 303

αmin = 1.28 D/λ

Answer 304

αmin = 1.22 λ/D

Answer 305

αmin = 1.22 D/λ

Answer 306

αmin = 1.21 λ/D

Answer 307

Diffraction pattern

Answer 308

Total internal reflection of light

Answer 309

Polarization

Answer 310

Interference pattern produced due to thin oil film

Answer 311

Diffraction

Answer 312

Reflection

Answer 313

Dispersion

Answer 314

Refraction

Answer 315

None of these

Answer 316

Dark fringes are thicker than bright

Answer 317

Different width

Answer 318

Equal width

Answer 319

All of these

Answer 320

Continuous emission spectrum

Answer 321

Line spectrum

Answer 322

Emission spectrum

Answer 323

Perpendicular

Answer 324

Principal focus of the lens

Answer 325

Aperture of the lens

Answer 326

Radius of curvature of the lens

Answer 327

Pole of the lens

Answer 328

Remains unchanged

Answer 329

Gets halved

Answer 330

None of these

Answer 331

fₑ - fₒ

Answer 332

fₒ - fₑ

Answer 333

fₑ + fₒ

Answer 334

Multi-mode graded index fiber

Answer 335

Single mode step index fiber

Answer 336

Multi-mode step index fiber

Answer 337

All types of fiber

Answer 338

Focal length

Answer 339

Principal axis

Answer 340

Radius of curvature

Answer 341

Energy of different colors is different

Answer 342

Amplitude of different colors is different

Answer 343

Velocity of different colors is different

Answer 344

Phase of different colors is different

Answer 345

All of these

Answer 346

Emission spectrum

Answer 347

Line spectrum

Answer 348

Continuous emission spectrum

Answer 349

Sodium light

Answer 350

Deviation angle

Answer 351

Incidence angle

Answer 352

Refractive angle

Answer 353

Critical angle

Answer 354

Supersonics

Answer 355

Ultrasonics

Answer 356

Refraction

Answer 357

Interference

Answer 358

Reflection

Answer 359

Diffraction

Answer 360

Turn table

Answer 361

Collimator

Answer 362

All of these

Answer 363

All of the above

Answer 364

Chromatic aberration

Answer 365

Spherical aberration

Answer 366

Chromatic aberration as well as spherical aberration

Answer 367

Refraction

Answer 368

Scattering

Answer 369

Dispersion

Answer 370

Reflection

Answer 371

Line absorption spectrum

Answer 372

Band absorption spectrum

Answer 373

Band emission 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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