1 ) If we consider same wavelength ( λ = h / mv ) of electrons and protons , then they will have ………… momentum .
A ) Same , B ) Different ,
C ) Can be same or different , D ) None of these ,
Correct Answer : - A ) Same ,
2 ) Diameter of atom is in range of about ………….. ( 0.1 to 0.5 nm ) .
3 ) In full wave rectifier with input frequency 50 Hz , the ripple in the output is mainly of frequency in Hz ?
A ) 50 Hz , B ) 100 Hz ,
C ) 150 Hz , D ) None of these ,
Correct Answer : - B ) 100 Hz ,
Solution : -
The input A.C will be :-
In full wave rectifier , the output will be like this : -
So , output frequency will be double because in full wave rectifier ( - ve ) part will changed into ( + ve ) part . So that frequency will become 100 Hz .
4 ) K.E of photoelectrons depends on ....................... but independent of Intensity of light .
A ) frequency , B ) Intensity ,
C ) Both , D ) None of these ,
Correct Answer : - A ) frequency ,
5 ) For fluid , pressure is ………………… related to velocity .
A ) Directly , B ) Inversely ,
C ) Equally , D ) None of these ,
Correct Answer : - B ) Inversely ,
6 ) The wave front due to a point source at a finite distance from the source is …………………. ,
A ) Spherical , B ) Non – spherical ,
C ) Can be both , D ) None of these ,
Correct Answer : - A ) Spherical ,
7 ) The tip of needle does not give a sharp image . it is due to ……………… ,
A ) Diffraction , B ) Polarization ,
C ) Interference , D ) None of these ,
Correct Answer : - A ) Diffraction ,
Because In this case , size of object is equall to order of wavelength . So light ray bends .
Now go to online quiz section and check your preparation by this link : -
 of electrons and protons , then they will have ………… momentum .){kind=link}
0 Comments