Physics Optics Online Mcqs Test

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Question 1

1. 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

Total internal reflection of light

Answer

Diffraction pattern

Answer

Interference pattern produced due to thin oil film

Answer

Polarization

Question 2

2. Final image produced by a compound microscope is

Answer

Virtual and inverted

Answer

Real and inverted

Answer

Virtual and erect

Answer

Real and erect

Question 3

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

Question 4

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

Answer

None of these

Answer

Speed of propagation less than the wave

Answer

Speed of propagation of the wave

Answer

Speed of propagation greater than wave

Question 5

5. 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 6

6. Choose the correct statement

Answer

Rays are normal to wave front

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

Question 7

7. 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 10¹¹ to 5 x 10¹⁴ Hz

Answer

5 x 10¹⁴ to 5 x 10¹⁷ Hz

Answer

5 x 10⁵ to 5 x 10⁸ Hz

Question 8

8. In a compound microscope, the intermediate image is

Answer

Real, erect and magnified

Answer

Virtual, erect and magnified

Answer

Virtual, erect and reduced

Answer

Virtual, inverted and magnified

Question 9

9. The light produced by a laser is all the following except

Answer

Incoherent

Answer

Monochromatic

Answer

In the form of a narrow beam

Answer

Electromagnetic

Question 10

10. 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 11

11. Consider telecommunication through optical fibers. Which of the following statements is not true?

Answer

Optical fibers are subject to electromagnetic interference from outside

Answer

Optical fibers can be of graded refractive index

Answer

Optical fibers have extremely low transmission loss

Answer

Optical fibers may have homogeneous core with a suitable cladding

Question 12

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

Answer

Wavelength

Answer

None of these

Question 13

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

Answer

Chromatic aberration as well as spherical aberration

Answer

All of the above

Answer

Chromatic aberration

Answer

Spherical aberration

Question 14

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

Answer

Center of curvature

Answer

Optical center

Question 15

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

Question 16

16. In a simple microscope lens used is _________.

Answer

Cylindrical

Answer

Plano convex

Question 17

17. In a compound microscope, the intermediate image is

Answer

Virtual, erect and magnified

Answer

Virtual, inverted and magnified

Answer

Virtual, erect and reduced

Answer

Real, erect and magnified

Question 18

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

Answer

At the focus

Answer

Inside the focus

Answer

All of these

Answer

Between f and 2f

Question 19

19. 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 propagate in a straight line

Answer

Laser rays are high velocity waves

Question 20

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

Question 21

21. 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 22

22. 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 23

23. 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 24

24. Optic fibers are related with

Answer

Communication

Answer

None of these

Question 25

25. 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 26

26. The diameter of a lens is called

Answer

Focal length

Answer

Principal axis

Answer

Radius of curvature

Question 27

27. If the red light is replaced by blue light illuminating the object in a microscope the resolving power of the microscope

Answer

Remains unchanged

Answer

Gets halved

Question 28

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

Question 29

29. Soap bubble looks colored due to

Answer

Any one of these

Answer

Reflection

Answer

Dispersion

Answer

Interference

Question 30

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

Answer

None of these

Question 31

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

Question 32

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

Answer

25 cm and infinity

Answer

0 and infinity

Answer

25 cm and 100 cm

Answer

0 and 25 cm

Question 33

33. 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 34

34. The light produced by a laser is all the following except

Answer

Monochromatic

Answer

In the form of a narrow beam

Answer

Incoherent

Answer

Electromagnetic

Question 35

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

Question 36

36. Which does not show polarization?

Answer

Both A and B

Answer

None of these

Answer

Longitudinal waves in gas

Answer

Transverse wave in gas

Question 37

37. 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 38

38. 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

Intensity of image will be increased

Answer

Housefly will be seen reduced in image

Answer

Intensity of image will be decreased

Question 39

39. 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 40

40. 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

Question 41

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

Question 42

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

Answer

Sodium light

Question 43

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

Answer

The least distance of the distinct vision

Answer

The focus of the objective lens

Answer

The focal of the eye piece

Question 44

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

Answer

Of the same frequency and having definite phase relationship

Answer

Different wavelength

Answer

Of same frequency

Answer

Of nearly the same frequency

Question 45

45. 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

Multi-mode step index fiber

Answer

Single mode step index fiber

Question 46

46. 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

Phase of different colors is different

Answer

Velocity of different colors is different

Answer

Amplitude of different colors is different

Question 47

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

Answer

d sin θ = (m + 1/2)

Answer

d sin θ = (m + 1/2)⁴

Answer

d sin θ = (m + 1/2)²

Answer

d sin θ = (m + 1)²

Question 48

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

Question 49

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

Answer

White light

Answer

Of difference frequencies

Question 50

50. Resolving power of a telescope depends on:

Answer

Diameter of objective lens

Answer

The magnification of eyepiece

Answer

Refractive index of objective lens

Answer

The focal length of objective lens

Question 51

51. Choose the correct statement

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

Answer

Rays are normal to wave front

Question 52

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

Answer

Wavelength

Question 53

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

Answer

Diverging (or concave) lens

Answer

Converging (or convex) lens

Answer

Plano convex lens

Answer

Plano concave lens

Question 54

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

Answer

Collimator

Answer

All of these

Answer

Turn table

Question 55

55. The power of a concave lens is

Question 56

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

Answer

Decreasing gradually

Answer

Increasing gradually

Answer

None of these

Answer

It is constant at the center

Question 57

57. Which is having minimum wavelength?

Answer

Cosmic-rays

Answer

Ultra-violet rays

Question 58

58. Inverse square law for luminance is valid for

Answer

Isotropic point source

Answer

Search light

Answer

All types of sources

Answer

Cylindrical source

Question 59

59. 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

Deviation angle

Answer

Critical angle

Question 60

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

Answer

Transformer

Question 61

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

Answer

Emission spectrum

Answer

Line spectrum

Answer

All of these

Answer

Continuous emission spectrum

Question 62

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

Answer

Perpendicular

Question 63

63. 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 64

64. 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

Answer 164

Water to air

Answer 165

Water to glass

Answer 166

Glass to air

Answer 167

Glass to water

Answer 168

Housefly will be seen reduced in image

Answer 169

Intensity of image will be decreased

Answer 170

Housefly will be seen enlarged in image

Answer 171

Intensity of image will be increased

Answer 172

2 x 10⁵ ms¯¹

Answer 173

5.5 x 10⁵

Answer 174

6.5 x 10⁸

Answer 175

4.5 x 10⁸ cm

Answer 176

The least distance of the distinct vision

Answer 177

The focus of the objective lens

Answer 178

The focal of the eye piece

Answer 179

Water to glass

Answer 180

Glass to air

Answer 181

Glass to water

Answer 182

Water to air

Answer 183

(m – 1) λ

Answer 184

Laser rays are high velocity waves

Answer 185

Laser rays propagate in a straight line

Answer 186

Laser rays are not absorbed

Answer 187

Laser rays are most coherent waves

Answer 188

Wavelength

Answer 189

Fringe width

Answer 190

Intensity ratio of the sources

Answer 191

Distance between the slits

Answer 192

Five times shorter than that of eye piece

Answer 193

Greater than that of eye piece

Answer 194

Equal to that of the eye piece

Answer 195

Shorter than that of eye piece

Answer 196

Wave front

Answer 197

A half-period zone

Answer 198

Real and inverted

Answer 199

Real and erect

Answer 200

Virtual and erect

Answer 201

Refraction

Answer 202

Reflection

Answer 203

Diffraction

Answer 204

Interference

Answer 205

Image size

Answer 206

Image position

Answer 207

Any of the above

Answer 208

Resolution of image

Answer 209

Equal width

Answer 210

Dark fringes are thicker than bright

Answer 211

Different width

Answer 212

None of these

Answer 213

If the object is within f

Answer 214

If the object is with in C

Answer 215

Both b and c

Answer 216

Object is beyond C

Answer 217

λ = 2π dm

Answer 218

Diffraction

Answer 219

Interference

Answer 220

Reflection

Answer 221

Refraction

Answer 222

2π Sin θ = (m + ½)λ

Answer 223

.d Sin θ = (m + ½)λ

Answer 224

.m Sin θ = (d + ½)λ

Answer 225

½ d Sin θ = mλ

Answer 226

Its magnification

Answer 227

Its diameter (of the objective)

Answer 228

The ratio of the focal length and the diameter

Answer 229

Its focal length

Answer 230

Dispersion

Answer 231

Diffraction

Answer 232

Reflection

Answer 233

Refraction

Answer 234

Supersonics

Answer 235

Ultrasonics

Answer 236

Search light

Answer 237

All types of sources

Answer 238

Isotropic point source

Answer 239

Cylindrical source

Answer 240

Image is formed at - ∞ and is real

Answer 241

Image is formed at + ∞ and is virtual

Answer 242

Image is formed at - ∞ and is virtual

Answer 243

Image is formed at + ∞ and is real

Answer 244

Between principal focus and center of curvature

Answer 245

Between principal focus and optical center

Answer 246

At the principal focus

Answer 247

Beyond 2 f

Answer 248

Much larger than the wavelength of light

Answer 249

Of the order of one millimeter

Answer 250

Much smaller than the wavelength of length

Answer 251

Of the same order as the wavelength of light

Answer 252

Line spectrum

Answer 253

All of these

Answer 254

Emission spectrum

Answer 255

Continuous emission spectrum

Answer 256

Scattering

Answer 257

Refraction

Answer 258

Dispersion

Answer 259

Reflection

Answer 260

Virtual and inverted

Answer 261

Real and inverted

Answer 262

Real and Erect

Answer 263

Virtual and Erect

Answer 264

Length of the telescope

Answer 265

Diameter of the objective lens

Answer 266

Focal length of objective lens

Answer 267

Focal length of eye lens

Answer 268

None of these

Answer 269

Remains the same

Answer 270

The focal length of objective lens

Answer 271

Refractive index of objective lens

Answer 272

The magnification of eyepiece

Answer 273

Diameter of objective lens

Answer 274

Y = (m+1/2)λd/L

Answer 275

Y = (m+1/2)λL/d

Answer 276

Y = (m+1/2) dL/λ

Answer 277

Y = (m+1)λL/d

Answer 278

Doppler’s effect

Answer 279

None of these

Answer 280

Diffraction

Answer 281

Interference

Answer 282

Magnification

Answer 283

Resolution

Answer 284

Light collection

Answer 285

None of these

Answer 286

Dispersion of light

Answer 287

Refraction

Answer 288

Total internal reflection

Answer 289

Reflection

Answer 290

(1+fo/fe)L/fo

Answer 291

Aperture of the lens

Answer 292

Principal focus of the lens

Answer 293

Pole of the lens

Answer 294

Radius of curvature of the lens

Answer 295

Elliptical

Answer 296

Total internal reflection

Answer 297

Refraction

Answer 298

Reflection

Answer 299

Scattering

Answer 300

Coming from opposite direction

Answer 301

Of high intensity

Answer 302

Of two different frequencies

Answer 303

Monochromatic

Answer 304

Refraction

Answer 305

Total internal reflection

Answer 306

Scattering

Answer 307

Reflection

Answer 308

A Plano convex lens and the plane glass plate

Answer 309

None of these

Answer 310

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

Answer 311

A Plano convex lens and simple glass sheet

Answer 312

Band spectrum

Answer 313

Continuous spectrum

Answer 314

Discontinuous spectrum

Answer 315

Line spectrum

Answer 316

Increase intensity of light

Answer 317

Produce polarized light

Answer 318

Produce unpolarised light

Answer 319

Reduced intensity of light

Answer 320

11 diopter

Answer 321

1/10 diopter

Answer 322

2/10 diopter

Answer 323

10 diopter

Answer 324

αmin = 1.22 D/λ

Answer 325

αmin = 1.21 λ/D

Answer 326

αmin = 1.28 D/λ

Answer 327

αmin = 1.22 λ/D

Answer 328

The diameter of the objective

Answer 329

Two of the above

Answer 330

The focal length of eyepiece

Answer 331

The focal length of the objective

Answer 332

Multi-mode graded index fiber

Answer 333

Multi-mode step index fiber

Answer 334

All types of fiber

Answer 335

Single mode step index fiber

Answer 336

(m – 1/2)λ

Answer 337

(m + 1/2)λ

Answer 338

Horsepower

Answer 339

fₒ - fₑ

Answer 340

fₑ + fₒ

Answer 341

fₑ - fₒ

Answer 342

None of these

Answer 343

Only the object is at infinity

Answer 344

Only the final image is at infinity

Answer 345

Both the object and the final image is at infinity

Answer 346

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

Answer 347

Yellow-green

Answer 348

Refraction

Answer 349

Diffraction

Answer 350

Reflection

Answer 351

Origin of spectra

Answer 352

Increase with decrease in focal length

Answer 353

No effect with decrease or increase with focal length

Answer 354

List distance of distinct vision

Answer 355

Increase with increase in focal length

Answer 356

Different with refractive index of core higher than cladding

Answer 357

Plano-concave

Answer 358

Double-convex

Answer 359

Plano-convex

Answer 360

Convexo-concave

Answer 361

Ultra-violet rays

Answer 362

Cosmic-rays

Answer 363

Image size

Answer 364

Any of the above

Answer 365

Resolution of image

Answer 366

Image position

Answer 367

Band absorption spectrum

Answer 368

Band emission spectrum

Answer 369

Line absorption spectrum

Answer 370

Line emission spectrum

Answer 371

Band absorption spectrum

Answer 372

Line 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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