Physics Optics Online Mcqs Test

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Question 1

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

Answer

Of high intensity

Answer

Of two different frequencies

Answer

Coming from opposite direction

Answer

Monochromatic

Question 2

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

Question 3

3. 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 4

4. The revolving power of a lens is given by

Answer

αmin = 1.22 D/λ

Answer

αmin = 1.28 D/λ

Answer

αmin = 1.21 λ/D

Answer

αmin = 1.22 λ/D

Question 5

5. 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 6

6. 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 7

7. Which of the following has least wavelength?

Answer

Ultra-violet rays

Answer

Cosmic-rays

Question 8

8. For constructive interference the path difference is

Answer

(m – 1) λ

Question 9

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

Question 10

10. An object is placed between f and 2f of a concave lens. The image formed will formed will be

Answer

Real and inverted

Answer

Virtual and Erect

Answer

Virtual and inverted

Answer

Real and Erect

Question 11

11. 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 12

12. 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 13

13. Final image produced by a compound microscope is

Answer

Real and erect

Answer

Real and inverted

Answer

Virtual and erect

Answer

Virtual and inverted

Question 14

14. The cause of mirage observed in desert is

Answer

Scattering

Answer

Reflection

Answer

Refraction

Answer

Total internal reflection

Question 15

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

Answer

Inside the focus

Answer

All of these

Answer

At the focus

Answer

Between f and 2f

Question 16

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

Answer

The focal length of the objective

Answer

The focal length of eyepiece

Answer

The diameter of the objective

Answer

Two of the above

Question 17

17. 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 18

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

Answer

Plano-convex

Answer

Plano-concave

Answer

Convexo-concave

Answer

Double-convex

Question 19

19. The fringe spacing in case of blue light

Answer

None of these

Answer

Remains the same

Question 20

20. Wavelength of light of frequency 100 Hz is

Answer

5 x 10⁶ m

Answer

2 x 10⁶ m

Answer

4 x 10⁶ m

Answer

3 x 10⁶ m

Question 21

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

Question 22

22. Ray optics is valid, when characteristic dimensions are

Answer

Much smaller than the wavelength of length

Answer

Of the order of one millimeter

Answer

Much larger than the wavelength of light

Answer

Of the same order as the wavelength of light

Question 23

23. Wavelength of light of frequency 100 Hz is

Answer

5 x 10⁶ m

Answer

2 x 10⁶ m

Answer

3 x 10⁶ m

Answer

4 x 10⁶ m

Question 24

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

Answer

Of difference frequencies

Answer

White light

Question 25

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

Answer

Have a lower frequency

Answer

Cannot be polarized

Answer

Cannot be diffracted

Answer

Do not affect a photographic plate

Question 26

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

Answer

Amplitude of different colors is different

Answer

Energy of different colors is different

Answer

Velocity of different colors is different

Answer

Phase of different colors is different

Question 27

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

Question 28

28. Choose the correct statement

Answer

Rays are 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 not normal to wave front

Question 29

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

Answer

Band emission spectrum

Answer

Line absorption spectrum

Answer

Line emission spectrum

Answer

Band absorption spectrum

Question 30

30. 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 31

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

Answer

If the object is with in C

Answer

Both b and c

Answer

Object is beyond C

Answer

If the object is within f

Question 32

32. The resolving power of a telescope depends on

Answer

Its focal length

Answer

Its magnification

Answer

The ratio of the focal length and the diameter

Answer

Its diameter (of the objective)

Question 33

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

Answer

Between principal focus and optical center

Answer

Beyond 2 f

Answer

At the principal focus

Answer

Between principal focus and center of curvature

Question 34

34. 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 10¹⁴ to 5 x 10¹⁷ Hz

Answer

5 x 10⁸ to 5 x 10¹¹ Hz

Answer

5 x 10⁵ to 5 x 10⁸ Hz

Answer

5 x 10¹¹ to 5 x 10¹⁴ Hz

Question 35

35. 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 36

36. Which is having minimum wavelength?

Answer

Cosmic-rays

Answer

Ultra-violet rays

Question 37

37. In a simple microscope lens used is _________.

Answer

Cylindrical

Answer

Plano convex

Question 38

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

Answer

Continuous spectrum

Answer

Line spectrum

Answer

Discontinuous spectrum

Answer

Band spectrum

Question 39

39. The diameter of a lens is called

Answer

Principal axis

Answer

Focal length

Answer

Radius of curvature

Question 40

40. The setting of Newton’s rings is

Answer

A Plano convex lens and the plane glass plate

Answer

A Plano convex lens and simple glass sheet

Answer

None of these

Answer

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

Question 41

41. 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 42

42. Unit of power of a lens is

Answer

Horsepower

Question 43

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

Answer

Refraction

Answer

Diffraction

Answer

Reflection

Answer

Dispersion

Question 44

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

Answer

Reflection

Answer

Refraction

Answer

Diffraction

Answer

Origin of spectra

Question 45

45. The resolving power of telescope depends on

Answer

Focal length of objective lens

Answer

Diameter of the objective lens

Answer

Focal length of eye lens

Answer

Length of the telescope

Question 46

46. 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 47

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

Question 48

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

Answer

Chromatic aberration

Answer

Spherical aberration

Answer

Chromatic aberration as well as spherical aberration

Answer

All of the above

Question 49

49. What is the most important function of telescope?

Answer

Light collection

Answer

None of these

Answer

Resolution

Answer

Magnification

Question 50

50. 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 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

Question 51

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

Question 52

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

Answer

Turn table

Answer

All of these

Answer

Collimator

Question 53

53. The diameter of a lens under use is called the

Answer

Pole of the lens

Answer

Principal focus of the lens

Answer

Radius of curvature of the lens

Answer

Aperture of the lens

Question 54

54. 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 55

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

Answer

Different with refractive index of core higher than cladding

Question 56

56. In a compound microscope, the intermediate image is

Answer

Virtual, erect and magnified

Answer

Virtual, inverted and magnified

Answer

Real, erect and magnified

Answer

Virtual, erect and reduced

Question 57

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

Answer

None of these

Answer

Equal width

Answer

Dark fringes are thicker than bright

Answer

Different width

Question 58

58. The cause of mirage observed in desert is

Answer

Refraction

Answer

Reflection

Answer

Scattering

Answer

Total internal reflection

Question 59

59. 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 60

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

Answer

Line spectrum

Answer

Emission spectrum

Answer

All of these

Answer

Continuous emission spectrum

Question 61

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

Answer

Supersonics

Answer

Ultrasonics

Question 62

62. 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 63

63. Inverse square law for luminance is valid for

Answer

Isotropic point source

Answer

Search light

Answer

Cylindrical source

Answer

All types of sources

Question 64

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

Answer

The focus of the objective lens

Answer

The least distance of the distinct vision

Answer

The focal of the eye piece

Answer 183

Sodium light

Answer 184

Diffraction pattern

Answer 185

Interference pattern produced due to thin oil film

Answer 186

Polarization

Answer 187

Total internal reflection of light

Answer 188

2π Sin θ = (m + ½)λ

Answer 189

.d Sin θ = (m + ½)λ

Answer 190

.m Sin θ = (d + ½)λ

Answer 191

½ d Sin θ = mλ

Answer 192

Image size

Answer 193

Image position

Answer 194

Resolution of image

Answer 195

Any of the above

Answer 196

Produce polarized light

Answer 197

Increase intensity of light

Answer 198

Produce unpolarised light

Answer 199

Reduced intensity of light

Answer 200

Yellow-green

Answer 201

Intensity of image will be increased

Answer 202

Housefly will be seen enlarged in image

Answer 203

Intensity of image will be decreased

Answer 204

Housefly will be seen reduced in image

Answer 205

Interference

Answer 206

Reflection

Answer 207

Refraction

Answer 208

Diffraction

Answer 209

No effect with decrease or increase with focal length

Answer 210

Increase with decrease in focal length

Answer 211

List distance of distinct vision

Answer 212

Increase with increase in focal length

Answer 213

Transverse wave in gas

Answer 214

None of these

Answer 215

Longitudinal waves in gas

Answer 216

Both A and B

Answer 217

Only the object is at infinity

Answer 218

Only the final image is at infinity

Answer 219

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

Answer 220

Both the object and the final image is at infinity

Answer 221

Diameter of objective lens

Answer 222

Refractive index of objective lens

Answer 223

The magnification of eyepiece

Answer 224

The focal length of objective lens

Answer 225

Quadrupled

Answer 226

Any one of these

Answer 227

Dispersion

Answer 228

Reflection

Answer 229

Interference

Answer 230

Laser rays propagate in a straight line

Answer 231

Laser rays are high velocity waves

Answer 232

Laser rays are most coherent waves

Answer 233

Laser rays are not absorbed

Answer 234

Resolution of image

Answer 235

Image size

Answer 236

Image position

Answer 237

Any of the above

Answer 238

(m + 1/2)λ

Answer 239

(m – 1/2)λ

Answer 240

Of same frequency

Answer 241

Different wavelength

Answer 242

Of nearly the same frequency

Answer 243

Of the same frequency and having definite phase relationship

Answer 244

5.5 x 10⁵

Answer 245

6.5 x 10⁸

Answer 246

2 x 10⁵ ms¯¹

Answer 247

4.5 x 10⁸ cm

Answer 248

R = N x m²

Answer 249

Both zero (0) and one (1)

Answer 250

Neither zero (0) nor one (1)

Answer 251

Wavelength

Answer 252

Increasing gradually

Answer 253

It is constant at the center

Answer 254

Decreasing gradually

Answer 255

None of these

Answer 256

fₑ - fₒ

Answer 257

fₑ + fₒ

Answer 258

None of these

Answer 259

fₒ - fₑ

Answer 260

Elliptical

Answer 261

Reflection

Answer 262

Refraction

Answer 263

Total internal reflection

Answer 264

Dispersion of light

Answer 265

The least distance of the distinct vision

Answer 266

The focus of the objective lens

Answer 267

The focal of the eye piece

Answer 268

Diffraction

Answer 269

Interference

Answer 270

Refraction

Answer 271

Reflection

Answer 272

Converging (or convex) lens

Answer 273

Plano concave lens

Answer 274

Plano convex lens

Answer 275

Diverging (or concave) lens

Answer 276

Virtual and erect

Answer 277

Real and inverted

Answer 278

Real and erect

Answer 279

Between f and 2 f

Answer 280

At the focus

Answer 281

None of these

Answer 282

Incoherent

Answer 283

Electromagnetic

Answer 284

In the form of a narrow beam

Answer 285

Monochromatic

Answer 286

1/10 diopter

Answer 287

10 diopter

Answer 288

2/10 diopter

Answer 289

11 diopter

Answer 290

Search light

Answer 291

Isotropic point source

Answer 292

Cylindrical source

Answer 293

All types of sources

Answer 294

Glass to water

Answer 295

Glass to air

Answer 296

Water to air

Answer 297

Water to glass

Answer 298

None of these

Answer 299

Wavelength

Answer 300

Multi-mode graded index fiber

Answer 301

Mono mode step index fiber

Answer 302

Single mode step index fiber

Answer 303

Multi-mode step index fiber

Answer 304

25 cm and infinity

Answer 305

0 and 25 cm

Answer 306

0 and infinity

Answer 307

25 cm and 100 cm

Answer 308

Rays are normal to wave front

Answer 309

Rays are not normal to wave front

Answer 310

Rays may be normal to wave front

Answer 311

There is no relationship between rays and wave fronts

Answer 312

Single mode step index fiber

Answer 313

All types of fiber

Answer 314

Multi-mode step index fiber

Answer 315

Multi-mode graded index fiber

Answer 316

(1+fo/fe)L/fo

Answer 317

Perpendicular

Answer 318

Real, erect and magnified

Answer 319

Virtual, erect and reduced

Answer 320

Virtual, erect and magnified

Answer 321

Virtual, inverted and magnified

Answer 322

Transformer

Answer 323

Laser rays propagate in a straight line

Answer 324

Laser rays are not absorbed

Answer 325

Laser rays are most coherent waves

Answer 326

Laser rays are high velocity waves

Answer 327

Shorter than that of eye piece

Answer 328

Five times shorter than that of eye piece

Answer 329

Equal to that of the eye piece

Answer 330

Greater than that of eye piece

Answer 331

Water to glass

Answer 332

Water to air

Answer 333

Glass to air

Answer 334

Glass to water

Answer 335

Emission spectrum

Answer 336

Continuous emission spectrum

Answer 337

All of these

Answer 338

Line spectrum

Answer 339

Intensity of image will be decreased

Answer 340

Housefly will be seen enlarged in image

Answer 341

Housefly will be seen reduced in image

Answer 342

Intensity of image will be increased

Answer 343

Communication

Answer 344

None of these

Answer 345

Intensity ratio of the sources

Answer 346

Wavelength

Answer 347

Fringe width

Answer 348

Distance between the slits

Answer 349

A half-period zone

Answer 350

Wave front

Answer 351

Electromagnetic

Answer 352

Incoherent

Answer 353

Monochromatic

Answer 354

In the form of a narrow beam

Answer 355

Speed of propagation less than the wave

Answer 356

Speed of propagation of the wave

Answer 357

Speed of propagation greater than wave

Answer 358

None of these

Answer 359

The magnification of eyepiece

Answer 360

Diameter of objective lens

Answer 361

Refractive index of objective lens

Answer 362

The focal length of objective lens

Answer 363

Refraction

Answer 364

Scattering

Answer 365

Reflection

Answer 366

Dispersion

Answer 367

Doppler’s effect

Answer 368

None of these

Answer 369

Interference

Answer 370

Diffraction

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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