12TH STANDARD PHYSICS Prepared by: R.RAJENDRAN,M.A., M.Sc.,M.Ed., N.INGARAN,M.Sc.,M.Phil.,M.Ed.,...

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12TH STANDARDPHYSICS

Prepared by:R.RAJENDRAN,M.A., M.Sc.,M.Ed., N.INGARAN,M.Sc.,M.Phil.,M.Ed.,

Electromagnetic waves and wave optics

1. Electromagnetic waves are discovered by

------------------

a) Planck

b) J.C.Maxwell

c) Newton

d) Huygens

CHOOSE THE CORRECT ANSWER

2. An accelerated charge is a source of ----------

a) electromagnetic radiation

b) heat radiation

c) mechanical waves

d) longitudinal waves

CHOOSE THE CORRECT ANSWER

3. Electromagnetic waves are ----------------- in

nature.

a) mechanical waves

b) longitudinal waves

c) transverse

d) none of the above

CHOOSE THE CORRECT ANSWER

4. The relation between the velocity of light C,

μ0 and ε0 is given by the relation C = ----------

a) 1 / √μ0 ε0

b) √μ0 ε0

c) √μ0 / ε0

d) √ ε0 / √μ0

CHOOSE THE CORRECT ANSWER

5. Hertz produced electromagnetic waves of

frequency ---------------

a) 5 × 109 Hz

b) 5 × 107 Hz

c) 5 × 10-7 Hz

d) 5 × 10-9 Hz

CHOOSE THE CORRECT ANSWER

6. Electromagnetic waves cover a wide range

of ----------------

a) directions

b) waves

c) frequencies

d) none of the above

CHOOSE THE CORRECT ANSWER

7. Atoms and molecules in an electric

discharge tube give -------------- rays.

a) infra-red

b) visible light

c) UV

d) X

CHOOSE THE CORRECT ANSWER

8. The wavelength , the frequency and velocity

of light are related by ----------------

a) c = γ λ

b) c = γ / λ

c) c = λ / γ

d) c = γ / λ2

CHOOSE THE CORRECT ANSWER

9. The frequency range of AM band is -----------

a) 54 MHz to 890 MHz

b) 88 MHz to 108 MHz

c) 530 kHz to 1710 kHz

d) 88 kHz to 108 kHz

CHOOSE THE CORRECT ANSWER

10. The frequency range of FM band is from

--------------

a) 54 MHz to 890 MHz

b) 88 MHz to 108 MHz

c) 530 kHz to 1710 kHz

d) 88 kHz to 108 kHz

CHOOSE THE CORRECT ANSWER

11. In Physiotherapy, ------------- lamps are

used.

a) infra-red

b) ordinary

c) UVray

d) X ray

CHOOSE THE CORRECT ANSWER

12. The wavelengths of the sodium emission

lines are ----------------- .

a) 5986 Ao and 5890 Ao

b) 5896 Ao and 5980 Ao

c) 5869 Ao and 5890 Ao

d) 5896 Ao and 5890 Ao

CHOOSE THE CORRECT ANSWER

13. The ----------- spectrum is used to identify

the gas.

a) continuous

b) band

c) line

d) none of the above

CHOOSE THE CORRECT ANSWER

14. Incandescent solids, carbon arc lamp etc.

give ------------- spectrum.

a) continuous

b) band

c) line

d) none of the above

CHOOSE THE CORRECT ANSWER

15. Using ------------- spectra, the molecular

structure of the substance can be studied.

a) continuous

b) band

c) line

d) none of the above

CHOOSE THE CORRECT ANSWER

16. The example of line absorption spectrum is

------------ spectrum.

a) solar

b) band

c) line

d) none of the above

CHOOSE THE CORRECT ANSWER

17. The sun’s outer layer is called ----------------

a) photosphere

b) ionosphere

c) thermosphere

d) chromosphere.

CHOOSE THE CORRECT ANSWER

18. The type of delayed fluorescence is called

-------------

a) Raman effect

b) Tyndal effect

c) Rayleigh scattering

d) phosphorescence

CHOOSE THE CORRECT ANSWER

19. According to corpuscular theory, light

energy is the kinetic energy of the -------------

a) waves

b) light source

c) photons

d) corpuscles

CHOOSE THE CORRECT ANSWER

20. Huygens assumed that light waves are

-------------- in nature.

a) longitudinal

b) transverse

c) mechanical

d) stationary

CHOOSE THE CORRECT ANSWER

21. The energy of each photon is given by the

equation --------------

a) E = mc2

b) E = h γ

c) E = ma

d) E = mv

CHOOSE THE CORRECT ANSWER

22. The scattering of sunlight by the molecules

of the earth’s atmosphere is called ---------

scattering.

a) Raman

b) Tyndal

c) Rayleigh

d) Einstein

CHOOSE THE CORRECT ANSWER

23. The scattering of light by the colloidal

particles is called --------------- effect.

a) Raman

b) Tyndal

c) Rayleigh

d) Einstein

CHOOSE THE CORRECT ANSWER

24. In industry, ---------------- spectroscopy is

applied to study the properties of the

materials.

a) Raman

b) Tyndal

c) Rayleigh

d) Einstein

CHOOSE THE CORRECT ANSWER

25. The locus of the particles having the same

state of vibration is called as ---------------

a) wave

b) corpuscle

c) wavefront

d) photon

CHOOSE THE CORRECT ANSWER

26. A linear source of light will give rise to

---------------- wavefront.

a) spherical

b) plane

c) cylindrical

d) elliptical

CHOOSE THE CORRECT ANSWER

27. -------------- principle helps us to locate the

position and the shape of the wavefront.

a) Raman

b) Tyndal

c) Rayleigh

d) Huygen

CHOOSE THE CORRECT ANSWER

28. In reflection of light, the angle of incidence

= the angle of ------------

a) refraction

b) polarisation

c) reflection

d) diffraction

CHOOSE THE CORRECT ANSWER

29. For total internal ----------- to take place,

light must travel from denser medium to rarer

medium.

a) refraction

b) polarisation

c) reflection

d) diffraction

CHOOSE THE CORRECT ANSWER

30. The equation of bandwidth of interference

fringes is β = ---------------

a) λD / d

b) λD d

c) λ /D d

d) λd / D

CHOOSE THE CORRECT ANSWER

31. An important application of interference in

thin films is the formation of -------------- rings.

a) Raman’s

b) Tyndal’s

c) Rayleigh’s

d) Newton’s

CHOOSE THE CORRECT ANSWER

32. The radius of the nth dark ring equation is

------------.

a) r n2 = ( n R λ )2

b) r n = n2 R λ

c) r n = ( n R λ ) ½

d) r n = n R2 λ

CHOOSE THE CORRECT ANSWER

33. The amount of bending in diffraction

depends on the ----------------

a) size of the obstacle

b) volume of the obstacle

c) size of the obstacle

d) wavelength of the incident wave.

CHOOSE THE CORRECT ANSWER

34. In Fresnel diffraction, the incident

wavefront is either -------------------

a) spherical or ellipse

b) plane or ellipsoid

c) spherical or cylindrical

d) elliptical

CHOOSE THE CORRECT ANSWER

35. Using spectrometer, ------------------

diffraction can be observed.

a) Fraunhofer

b) Raman

c) Tyndal

d) Rayleigh

CHOOSE THE CORRECT ANSWER

36. The combined width of a slit and a ruling is

called -----------------

a) grating element

b) prism element

c) polaroid element

d) element

CHOOSE THE CORRECT ANSWER

37. In a plane diffraction grating, λ = -------------

a) nm / Sin θ

b) Sin θ / nm

c) nm / Sin θ

d) ( nm Sin θ )1/2

CHOOSE THE CORRECT ANSWER

38. The phenomenon of ---------------- proves

that light waves are transverse.

a) refraction

b) polarisation

c) reflection

d) diffraction

CHOOSE THE CORRECT ANSWER

39. The plane perpendicular to the plane of

vibration is called plane of ------------------

a) refraction

b) polarisation

c) reflection

d) diffraction

CHOOSE THE CORRECT ANSWER

40. A device that produces a plane -------------

light is called polariser.

a) polarized

b) reflected

c) refracted

d) diffracted

CHOOSE THE CORRECT ANSWER

41. The angle of incidence at which the

reflected beam is completely plane polarised

is called angle of -----------------

a) refraction

b) diffraction

c) reflection

d) polarisation

CHOOSE THE CORRECT ANSWER

42. The equation for Brewster’s law is μ = ------

a) sin i p

b) cot i p

c) tan i p

d) cos i p

CHOOSE THE CORRECT ANSWER

43. The polarising angle for glass is

-------------------

a) 57. 5

b) 56. 5

c) 32. 5

d) 50. 7

CHOOSE THE CORRECT ANSWER

44. The pile of plates uses the polarisation by

---------------------- phenomenon.

a) refraction

b) polarisation

c) reflection

d) diffraction

CHOOSE THE CORRECT ANSWER

45. The double refraction phenomenon was

discovered by ------------------

a) Bartholinus

b) Malus

c) Nicol

d) Young

CHOOSE THE CORRECT ANSWER

46. Crystals like mica, topaz etc. having two

optic axes are called ------------------

a) uni-axial crystals

b) multi-axial crystals

c) biaxial crystals

d) none of the above

CHOOSE THE CORRECT ANSWER

47. The refractive index for Canada balsam

cement is -------------- for both the rays.

a) 1.486

b) 1.658

c) 1.550

d) 1.333

CHOOSE THE CORRECT ANSWER

48. H polaroids use a thin film of -------------------

a) herapathite crystals

b) polyvinyl alcohol

c) Canada balsam

d) Na Cl

CHOOSE THE CORRECT ANSWER

49. Polaroids are used as -----------------------

glasses.

a) moon

b) star

c) planet

d) sun

CHOOSE THE CORRECT ANSWER

50. In an EM wave, the electric and the

magnetic field vectors are at ----------- to each

other and to the direction of propagation.

a) 45

b) 90

c) 180

d) 145

CHOOSE THE CORRECT ANSWER

51. In an electromagnetic wave

(a) power is equally transferred along the

electric and magnetic fields

(b) power is transmitted in a direction

perpendicular to both the fields

(c) power is transmitted along electric field

(d) power is transmitted along magnetic field

CHOOSE THE CORRECT ANSWER

52. Electromagnetic waves are

(a) transverse

(b) longitudinal

(c) may be longitudinal or transverse

(d) neither longitudinal nor transverse

CHOOSE THE CORRECT ANSWER

53. Refractive index of glass is 1.5. Time taken

for light to pass through a glass plate of

thickness 10 cm is

(a) 2 × 10–8 s (b) 2 × 10–10 s

(c) 5 × 10–8 s (d) 5 × 10–10 s

CHOOSE THE CORRECT ANSWER

54. In an electromagnetic wave the phase

difference between electric field and

magnetic field is

(a) π/4

(b) π/2

(c) π

(d) zero

CHOOSE THE CORRECT ANSWER

E

B

55. Atomic spectrum should be

(a) pure line spectrum

(b) emission band spectrum

(c) absorption line spectrum

(d) absorption band spectrum.

CHOOSE THE CORRECT ANSWER

56. When a drop of water is introduced between

the glass plate and plano convex lens in

Newton’s rings system, the ring system

(a) contracts

(b) expands

(c) remains same

(d) first expands, then contracts

CHOOSE THE CORRECT ANSWER

57. A beam of monochromatic light enters from vacuum into a medium of refractive index μ. The ratio of the wavelengths of the incident and refracted waves is

(a) μ : 1 (b) 1 : μ

(c) μ2 : 1 (d) 1 : μ2

CHOOSE THE CORRECT ANSWER

58. If the wavelength of the light is reduced to

one fourth, then the amount of scattering is

(a) increased by 16 times

(b) decreased by 16 times

(c) increased by 256 times

(d) decreased by 256 times

CHOOSE THE CORRECT ANSWER

59. In Newton’s ring experiment the radii of the mth and (m + 4)th dark rings are respectively 5 mm and 7 mm. What is the value of m?

(a) 2 (b) 4

(c) 8 (d) 10

CHOOSE THE CORRECT ANSWER

60. The path difference between two monochromatic light waves of wavelength 4000 Å is 2 × 10−7 m. The phase difference between them is

(a) π (b) 2π

(c) 3/2π (d) π/2

CHOOSE THE CORRECT ANSWER

61. In Young’s experiment, the third bright band for wavelength of light 6000 Å coincides with the fourth bright band for another source in the same arrangement. The wave length of the another source is

(a) 4500 Å (b) 6000 Å

(c) 5000 Å (d) 4000 Å

CHOOSE THE CORRECT ANSWER

62. A light of wavelength 6000 Å is incident normally on a grating 0.005 m wide with 2500 lines. Then the maximum order is

(a) 3 (b) 2

(c) 1 (d) 4

CHOOSE THE CORRECT ANSWER

63. A diffraction pattern is obtained using a beam of red light. What happens if the red light is replaced by blue light?(a) bands disappear(b) no change(c) diffraction pattern becomes narrower and crowded together(d) diffraction pattern becomes broader and farther apart

CHOOSE THE CORRECT ANSWER

64. The refractive index of the medium, for the

polarising angle 60 is

(a) 1.732 (b) 1.414

(c) 1.5 (d) 1.468

CHOOSE THE CORRECT ANSWER

THE END