Transcript PHYSICS 5x - rajendranmaster

12TH STANDARD
PHYSICS
Prepared by:
R.RAJENDRAN,M.A., M.Sc.,M.Ed.,
N.INGARAN,M.Sc.,M.Phil.,M.Ed.,
Electromagnetic waves
and wave optics
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1. Electromagnetic waves are discovered by -----------------
a) Planck
b) J.C.Maxwell
c) Newton
d) Huygens
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2. An accelerated charge is a source of ---------a) electromagnetic radiation
b) heat radiation
c) mechanical waves
d) longitudinal waves
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3. Electromagnetic waves are ----------------- in
nature.
a) mechanical waves
b) longitudinal waves
c) transverse
d) none of the above
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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
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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
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6. Electromagnetic waves cover a wide range
of ----------------
a) directions
b) waves
c) frequencies
d) none of the above
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7. Atoms and molecules in an electric
discharge tube give -------------- rays.
a) infra-red
b) visible light
c) UV
d) X
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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
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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
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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
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11. In Physiotherapy, ------------- lamps are
used.
a) infra-red
b) ordinary
c) UVray
d) X ray
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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
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13. The ----------- spectrum is used to identify
the gas.
a) continuous
b) band
c) line
d) none of the above
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14. Incandescent solids, carbon arc lamp etc.
give ------------- spectrum.
a) continuous
b) band
c) line
d) none of the above
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15. Using ------------- spectra, the molecular
structure of the substance can be studied.
a) continuous
b) band
c) line
d) none of the above
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16. The example of line absorption spectrum is
------------ spectrum.
a) solar
b) band
c) line
d) none of the above
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17. The sun’s outer layer is called ---------------a) photosphere
b) ionosphere
c) thermosphere
d) chromosphere.
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18. The type of delayed fluorescence is called ------------
a) Raman effect
b) Tyndal effect
c) Rayleigh scattering
d) phosphorescence
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19. According to corpuscular theory, light
energy is the kinetic energy of the -------------
a) waves
b) light source
c) photons
d) corpuscles
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20. Huygens assumed that light waves are ------------- in nature.
a) longitudinal
b) transverse
c) mechanical
d) stationary
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21. The energy of each photon is given by the
equation --------------
a) E = mc2
b) E = h γ
c) E = ma
d) E = mv
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22. The scattering of sunlight by the molecules
of the earth’s atmosphere is called --------scattering.
a) Raman
b) Tyndal
c) Rayleigh
d) Einstein
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23. The scattering of light by the colloidal
particles is called --------------- effect.
a) Raman
b) Tyndal
c) Rayleigh
d) Einstein
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24. In industry, ---------------- spectroscopy is
applied to study the properties of the
materials.
a) Raman
b) Tyndal
c) Rayleigh
d) Einstein
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25. The locus of the particles having the same
state of vibration is called as ---------------
a) wave
b) corpuscle
c) wavefront
d) photon
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26. A linear source of light will give rise to --------------- wavefront.
a) spherical
b) plane
c) cylindrical
d) elliptical
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27. -------------- principle helps us to locate the
position and the shape of the wavefront.
a) Raman
b) Tyndal
c) Rayleigh
d) Huygen
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28. In reflection of light, the angle of incidence
= the angle of ------------
a) refraction
b) polarisation
c) reflection
d) diffraction
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29. For total internal ----------- to take place,
light must travel from denser medium to rarer
medium.
a) refraction
b) polarisation
c) reflection
d) diffraction
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30. The equation of bandwidth of interference
fringes is β = ---------------
a) λD / d
b) λD d
c) λ /D d
d) λd / D
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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
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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
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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.
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34. In Fresnel diffraction, the incident
wavefront is either -------------------
a) spherical or ellipse
b) plane or ellipsoid
c) spherical or cylindrical
d) elliptical
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35. Using spectrometer, -----------------diffraction can be observed.
a) Fraunhofer
b) Raman
c) Tyndal
d) Rayleigh
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36. The combined width of a slit and a ruling is
called -----------------
a) grating element
b) prism element
c) polaroid element
d) element
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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
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38. The phenomenon of ---------------- proves
that light waves are transverse.
a) refraction
b) polarisation
c) reflection
d) diffraction
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39. The plane perpendicular to the plane of
vibration is called plane of ------------------
a) refraction
b) polarisation
c) reflection
d) diffraction
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40. A device that produces a plane ------------light is called polariser.
a) polarized
b) reflected
c) refracted
d) diffracted
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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
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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
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43. The polarising angle for glass is ------------------
a) 57. 5
b) 56. 5
c) 32. 5
d) 50. 7
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44. The pile of plates uses the polarisation by --------------------- phenomenon.
a) refraction
b) polarisation
c) reflection
d) diffraction
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45. The double refraction phenomenon was
discovered by ------------------
a) Bartholinus
b) Malus
c) Nicol
d) Young
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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
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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
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48. H polaroids use a thin film of ------------------a) herapathite crystals
b) polyvinyl alcohol
c) Canada balsam
d) Na Cl
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49. Polaroids are used as ----------------------glasses.
a) moon
b) star
c) planet
d) sun
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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
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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
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52. Electromagnetic waves are
(a) transverse
(b) longitudinal
(c) may be longitudinal or transverse
(d) neither longitudinal nor transverse
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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
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54. In an electromagnetic wave the phase

difference between electric field E and

magnetic field B is
(a) π/4
(b) π/2
(c) π
(d) zero
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55. Atomic spectrum should be
(a) pure line spectrum
(b) emission band spectrum
(c) absorption line spectrum
(d) absorption band spectrum.
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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
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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
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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
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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
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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
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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
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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
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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
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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
THE END