1 ) The frequency of X rays , gamma rays , ultraviolet rays are respectively n1 , n2 , n3 . Then : -
A ) n2 > n1
> n3 , B ) n2 < n1 > n3 ,
C ) n2 < n1 < n3
, D
) None of these ,
Correct
Answer : - A ) n2 > n1 > n3 ,
Because
the wavelength and frequency order for electromagnetic waves is : -
2 )
Frequency of seconds pendulum is ?
A ) 0.5 hz , B
) 1.0 hz ,
C ) 2.5 hz , D
) None of these ,
Correct
Answer : - A ) 0.5 hz ,
t =
2 seconds ,
So
frequency = f = 1 / t = 1 / 2 = 0.5 hz .
3 )
Which have longest wavelength : -
A ) radio waves , B ) r - rays ,
C ) X – rays , D ) Cosmic rays ,
Correct
Answer : - A ) radio waves ,
4 )
The scattering angle for which the Compton shift in wavelength is equal to the
Compton wavelength ?
A ) 0 degree , B
) 90 degree ,
C ) 120 degree , D
) 180 degree , ,
Correct
Answer : - B ) 90 degree ,
Solution
: -
Formula
: -
Compton wavelength : -
∆λ = h/mv ,
Compton shift :
- ∆λ = ( h/mv )( 1 – cosθ ) ,
So here we put θ
= 90 degree , because
( cos90 = 0 )
So ,
∆λ = ( h/mv )( 1 – 0 )
,
∆λ =
( h/mv ) So , Compton wavelength and
Compton shift becomes equal .
5 )
Critical angle of light passing from glass to air is minimum for . . . . . . .
. . . . . . . . . ( blue ) .
6
) Torque acting on a body determines
..........
A ) angular momentum , B
) linear momentum ,
C ) both of these , D
) None of these ,
Correct
Answer : - A ) angular momentum ,
Now go to online quiz section and Physics Quiz 8 is uploaded related to these mcqs , so check your preparation by this link : -
