Physics Optics Online Mcqs Test

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Question 1

1. 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 2

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

Answer

Discontinuous spectrum

Answer

Continuous spectrum

Answer

Line spectrum

Answer

Band spectrum

Question 3

3. Which does not show polarization?

Answer

Both A and B

Answer

Longitudinal waves in gas

Answer

Transverse wave in gas

Answer

None of these

Question 4

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

Answer

Double-convex

Answer

Plano-convex

Answer

Convexo-concave

Answer

Plano-concave

Question 5

5. In compound microscope, length of microscope is 21.5 cm, focal length of objective is 1.6 cm, focal length of eye piece is 2.1 cm and if final image is formed at infinity they distance of object from objective lens is

Question 6

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

Question 7

7. 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 8

8. Magnification of the astronomical telescope is

Answer

(1+fo/fe)L/fo

Question 9

9. 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 virtual

Answer

Image is formed at + ∞ and is virtual

Answer

Image is formed at - ∞ and is real

Question 10

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

Answer

Laser rays are not absorbed

Answer

Laser rays are most coherent waves

Answer

Laser rays are high velocity waves

Answer

Laser rays propagate in a straight line

Question 11

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

Question 12

12. 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 13

13. 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 14

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

Answer

Wavelength

Question 15

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

Question 16

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

Answer

Supersonics

Answer

Ultrasonics

Question 17

17. 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 18

18. Final image produced by a compound microscope is

Answer

Real and erect

Answer

Virtual and inverted

Answer

Real and inverted

Answer

Virtual and erect

Question 19

19. 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 20

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

Answer

Y = (m+1/2)λd/L

Answer

Y = (m+1/2)λL/d

Answer

Y = (m+1)λL/d

Answer

Y = (m+1/2) dL/λ

Question 21

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

Answer

(m + 1/2)λ

Answer

(m – 1/2)λ

Question 22

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

Answer

Sodium light

Question 23

23. A prism splits a beam of white light into its seven constituent colors. This is so because

Answer

Energy of different colors is different

Answer

Velocity of different colors is different

Answer

Phase of different colors is different

Answer

Amplitude of different colors is different

Question 24

24. 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 25

25. Resolving power of a telescope depends on:

Answer

Diameter of objective lens

Answer

The focal length of objective lens

Answer

The magnification of eyepiece

Answer

Refractive index of objective lens

Question 26

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

Question 27

27. 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 28

28. Inverse square law for luminance is valid for

Answer

Search light

Answer

Cylindrical source

Answer

All types of sources

Answer

Isotropic point source

Question 29

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

Answer

Distance between the slits

Answer

Intensity ratio of the sources

Answer

Fringe width

Answer

Wavelength

Question 30

30. 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 31

31. 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

Question 32

32. The resolving power of telescope depends on

Answer

Diameter of the objective lens

Answer

Focal length of eye lens

Answer

Length of the telescope

Answer

Focal length of objective lens

Question 33

33. The power of a concave lens is

Question 34

34. Geometrical optics cannot give following characteristics for a microscope

Answer

Image position

Answer

Resolution of image

Answer

Any of the above

Answer

Image size

Question 35

35. The cause of mirage observed in desert is

Answer

Total internal reflection

Answer

Refraction

Answer

Scattering

Answer

Reflection

Question 36

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

Answer

Virtual and erect

Answer

Real and inverted

Answer

Real and erect

Question 37

37. A polarizer is used to

Answer

Produce polarized light

Answer

Reduced intensity of light

Answer

Increase intensity of light

Answer

Produce unpolarised light

Question 38

38. 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 less than the wave

Answer

Speed of propagation greater than wave

Answer

None of these

Question 39

39. In a compound microscope, the intermediate image is

Answer

Virtual, inverted and magnified

Answer

Real, erect and magnified

Answer

Virtual, erect and reduced

Answer

Virtual, erect and magnified

Question 40

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

Answer

Of same frequency

Answer

Different wavelength

Answer

Of nearly the same frequency

Answer

Of the same frequency and having definite phase relationship

Question 41

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

Answer

2/10 diopter

Answer

1/10 diopter

Answer

10 diopter

Answer

11 diopter

Question 42

42. 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 43

43. What is the most important function of telescope?

Answer

Light collection

Answer

None of these

Answer

Resolution

Answer

Magnification

Question 44

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

Answer

White light

Answer

Of difference frequencies

Question 45

45. 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

Total internal reflection of light

Answer

Polarization

Answer

Interference pattern produced due to thin oil film

Question 46

46. 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 47

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

Answer

Cannot be diffracted

Answer

Cannot be polarized

Answer

Do not affect a photographic plate

Answer

Have a lower frequency

Question 48

48. 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 49

49. The length of a microscope is 12 cm and its magnifying power is 25 for relaxed eye. The focal length of the eye piece is 4 cm. The distance of the object from the objective is

Question 50

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

Answer

Between f and 2f

Answer

At the focus

Answer

Inside the focus

Answer

All of these

Question 51

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

Answer

fₑ + fₒ

Answer

None of these

Answer

fₑ - fₒ

Answer

fₒ - fₑ

Question 52

52. Optic fibers are related with

Answer

None of these

Answer

Communication

Question 53

53. Magnifying power of simple microscope

Answer

No effect with decrease or increase with focal length

Answer

List distance of distinct vision

Answer

Increase with increase in focal length

Answer

Increase with decrease in focal length

Question 54

54. The diameter of a lens is called

Answer

Radius of curvature

Answer

Focal length

Answer

Principal axis

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

Answer

Incidence angle

Answer

Critical angle

Answer

Deviation angle

Answer

Refractive angle

Question 57

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

Answer

None of these

Question 58

58. Choose the correct statement

Answer

Rays may be normal to wave front

Answer

Rays are normal to wave front

Answer

There is no relationship between rays and wave fronts

Answer

Rays are not normal to wave front

Question 59

59. 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

6.5 x 10⁸

Answer

4.5 x 10⁸ cm

Answer

5.5 x 10⁵

Answer

2 x 10⁵ ms¯¹

Question 60

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

Question 61

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

Answer

Wavelength

Answer

None of these

Question 62

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

Question 63

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

Question 64

64. 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

Answer 172

Refractive index of objective lens

Answer 173

The focal length of objective lens

Answer 174

Diameter of objective lens

Answer 175

The magnification of eyepiece

Answer 176

All of the above

Answer 177

Spherical aberration

Answer 178

Chromatic aberration

Answer 179

Chromatic aberration as well as spherical aberration

Answer 180

Optical fibers are subject to electromagnetic interference from outside

Answer 181

Optical fibers have extremely low transmission loss

Answer 182

Optical fibers can be of graded refractive index

Answer 183

Optical fibers may have homogeneous core with a suitable cladding

Answer 184

Converging (or convex) lens

Answer 185

Plano convex lens

Answer 186

Plano concave lens

Answer 187

Diverging (or concave) lens

Answer 188

None of these

Answer 189

Decreasing gradually

Answer 190

Increasing gradually

Answer 191

It is constant at the center

Answer 192

At the principal focus

Answer 193

Between principal focus and center of curvature

Answer 194

Beyond 2 f

Answer 195

Between principal focus and optical center

Answer 196

Of the order of one millimeter

Answer 197

Much smaller than the wavelength of length

Answer 198

Of the same order as the wavelength of light

Answer 199

Much larger than the wavelength of light

Answer 200

None of these

Answer 201

There is no relationship between rays and wave fronts

Answer 202

Rays are normal to wave front

Answer 203

Rays are not normal to wave front

Answer 204

Raya may be normal to wave front

Answer 205

Plano convex

Answer 206

Cylindrical

Answer 207

Scattering

Answer 208

Dispersion

Answer 209

Refraction

Answer 210

Reflection

Answer 211

Resolution of image

Answer 212

Image position

Answer 213

Any of the above

Answer 214

Image size

Answer 215

Band emission spectrum

Answer 216

Line absorption spectrum

Answer 217

Band absorption spectrum

Answer 218

Line emission spectrum

Answer 219

Radius of curvature of the lens

Answer 220

Aperture of the lens

Answer 221

Principal focus of the lens

Answer 222

Pole of the lens

Answer 223

All types of fiber

Answer 224

Multi-mode step index fiber

Answer 225

Single mode step index fiber

Answer 226

Multi-mode graded index fiber

Answer 227

Reflection

Answer 228

Diffraction

Answer 229

Refraction

Answer 230

Interference

Answer 231

Any one of these

Answer 232

Reflection

Answer 233

Dispersion

Answer 234

Interference

Answer 235

Both the object and the final image is at infinity

Answer 236

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

Answer 237

Only the final image is at infinity

Answer 238

Only the object is at infinity

Answer 239

Multi-mode step index fiber

Answer 240

Single mode step index fiber

Answer 241

Multi-mode graded index fiber

Answer 242

Mono mode step index fiber

Answer 243

Transformer

Answer 244

Equal width

Answer 245

Dark fringes are thicker than bright

Answer 246

Different width

Answer 247

None of these

Answer 248

Reflection

Answer 249

Refraction

Answer 250

Diffraction

Answer 251

Dispersion

Answer 252

Emission spectrum

Answer 253

All of these

Answer 254

Continuous emission spectrum

Answer 255

Line spectrum

Answer 256

25 cm and infinity

Answer 257

0 and infinity

Answer 258

0 and 25 cm

Answer 259

25 cm and 100 cm

Answer 260

Yellow-green

Answer 261

Horsepower

Answer 262

Equal to that of the eye piece

Answer 263

Five times shorter than that of eye piece

Answer 264

Greater than that of eye piece

Answer 265

Shorter than that of eye piece

Answer 266

5 x 10⁸ to 5 x 10¹¹ Hz

Answer 267

5 x 10¹⁴ to 5 x 10¹⁷ Hz

Answer 268

5 x 10¹¹ to 5 x 10¹⁴ Hz

Answer 269

5 x 10⁵ to 5 x 10⁸ Hz

Answer 270

Reflection

Answer 271

Interference

Answer 272

Refraction

Answer 273

Diffraction

Answer 274

Real and inverted

Answer 275

Real and Erect

Answer 276

Virtual and Erect

Answer 277

Virtual and inverted

Answer 278

αmin = 1.28 D/λ

Answer 279

αmin = 1.22 λ/D

Answer 280

αmin = 1.22 D/λ

Answer 281

αmin = 1.21 λ/D

Answer 282

Water to glass

Answer 283

Glass to air

Answer 284

Water to air

Answer 285

Glass to water

Answer 286

Optical center

Answer 287

Center of curvature

Answer 288

Cosmic-rays

Answer 289

Ultra-violet rays

Answer 290

Object is beyond C

Answer 291

Both b and c

Answer 292

If the object is within f

Answer 293

If the object is with in C

Answer 294

Collimator

Answer 295

All of these

Answer 296

Turn table

Answer 297

Gets halved

Answer 298

Remains unchanged

Answer 299

Reflection

Answer 300

Refraction

Answer 301

Scattering

Answer 302

Total internal reflection

Answer 303

Refraction

Answer 304

Reflection

Answer 305

Total internal reflection

Answer 306

Dispersion of light

Answer 307

Incoherent

Answer 308

In the form of a narrow beam

Answer 309

Monochromatic

Answer 310

Electromagnetic

Answer 311

(m – 1) λ

Answer 312

Laser rays are not absorbed

Answer 313

Laser rays are high velocity waves

Answer 314

Laser rays are most coherent waves

Answer 315

Laser rays propagate in a straight line

Answer 316

Continuous emission spectrum

Answer 317

All of these

Answer 318

Emission spectrum

Answer 319

Line spectrum

Answer 320

Cosmic-rays

Answer 321

Ultra-violet rays

Answer 322

Origin of spectra

Answer 323

Diffraction

Answer 324

Refraction

Answer 325

Reflection

Answer 326

3 x 10⁶ m

Answer 327

2 x 10⁶ m

Answer 328

4 x 10⁶ m

Answer 329

5 x 10⁶ m

Answer 330

4 x 10⁶ m

Answer 331

5 x 10⁶ m

Answer 332

2 x 10⁶ m

Answer 333

3 x 10⁶ m

Answer 334

Different with refractive index of core higher than cladding

Answer 335

Quadrupled

Answer 336

Doppler’s effect

Answer 337

None of these

Answer 338

Diffraction

Answer 339

Interference

Answer 340

All types of sources

Answer 341

Search light

Answer 342

Cylindrical source

Answer 343

Isotropic point source

Answer 344

The focal of the eye piece

Answer 345

The focus of the objective lens

Answer 346

The least distance of the distinct vision

Answer 347

The diameter of the objective

Answer 348

The focal length of eyepiece

Answer 349

Two of the above

Answer 350

The focal length of the objective

Answer 351

Monochromatic

Answer 352

Incoherent

Answer 353

Electromagnetic

Answer 354

In the form of a narrow beam

Answer 355

d sin θ = (m + 1/2)²

Answer 356

d sin θ = (m + 1)²

Answer 357

d sin θ = (m + 1/2)

Answer 358

d sin θ = (m + 1/2)⁴

Answer 359

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

Answer 360

A Plano convex lens and the plane glass plate

Answer 361

A Plano convex lens and simple glass sheet

Answer 362

None of these

Answer 363

Remains the same

Answer 364

None of these

Answer 365

Perpendicular

Answer 366

2π Sin θ = (m + ½)λ

Answer 367

½ d Sin θ = mλ

Answer 368

.m Sin θ = (d + ½)λ

Answer 369

.d Sin θ = (m + ½)λ

Answer 370

Elliptical

Answer 371

Band emission spectrum

Answer 372

Line absorption spectrum

Answer 373

Line emission 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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