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 .
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