1 ) We can hear sound of a person around the corner
but cannot see because of …………….
A ) Polarization ,
b ) Diffraction ,
C ) Both ,
c ) None ,
Correct Answer : - b ) Diffraction ,
Because the sound waves have much greater
wavelengths as compare to light waves . Sound waves also undergoes bending ,
diffraction , moving , spreading , etc . So that the diffraction of
the sound waves around the corner is noticeable and
we can easily hear the sound around the corners rather we
can't see a person around the corners. But sound waves does not
undergoes polarization . Polarization is a property that applies to transverse
waves which specifies the geometrical orientation of oscillations . Light waves
undergoes the polarization . In the transverse waves , the direction of
oscillation and the direction of motion of the waves are perpendicular to each
other .
2 ) Huygens
wave theory of light cannot explain …….............…………..
A ) Polarization ,
B ) Diffraction ,
C) Photoelectric effect ,
D ) None of these ,
Correct answer : - A
) Photoelectric effect ,
Huygen wave theory of light explains diffraction ,
polarization and also interference but cannot explains the photoelectric effect of light , because
of particle’s nature of the light .
3
) Child paradox is a consequences of ............................ ,
A ) Time dilation , B ) Mass
dilation ,
C ) Length contraction , D ) None of these ,
Correct
Answer : - A ) Time dilation ,
4
) The blue color of sky is seems to be blue
because of …………….. ,
A ) Scattering , B
) Diffraction ,
C ) Both of these , D
) None of these ,
Correct
Answer : - A ) Scattering ,
Because such type of scattering refers to the scattering of electromagnetic radiation of smaller wavelength . And blue light is scattered in all directions by the very small ( tiny ) particles of air in atmosphere . Due to small wavelength blue light scatters more than other colors e.g. red etc .
