1 ) Two identical conducting spheres A and B carry identical charges . They are separated by a distance much longer then their diameters . Third identical conducting sphere C is uncharged , first touch to A and then B and then removed , then the force between A and B will ?
A ) 1/8 times , B ) 3/8 times ,
C ) 7/8 times , D ) no change ,
Correct Answer : - B ) 3/8 times ,
Solution : -
2 ) if two bodies of different masses initially at rest , acted upon by same force and same time , then bodies will have same …………. ,
A ) acceleration , B ) momentum ,
C ) torque , D ) None of these ,
Correct Answer : - B ) momentum ,
Because ∆P = F x t .
3 ) Compton wave shift = (h/mv)(1-cosθ)
4 ) An electron is placed in a box about size of an atom that is about 1 x 10^(-10) m . What is velocity of electron ?
A ) 7.29 x 10^6 , B ) 7.29 x 10^8 ,
C ) 7.29 x 10^11 , D ) None of these ,
Correct Answer : - A ) 7.29 x 10^6 ,
Solution : -
Size of an electron = ∆x = 1 x 10^(-10) m .
Velocity of an electron = ∆v = ?
Formula : -
As we know the mass of electron = 9.11 x 10^(-31) kg .
Planks constant = 6.63 x 10^(-34) Js .
So , using uncertainty principle : -
Ø ∆P . ∆x = h ,
Ø ( m . ∆v ) . ∆x = h ,
Ø ∆v = h / (m.∆x) ,
Ø ∆v = {6.63 x 10^(-34)} / {9.11 x 10^(-31) x 1 x 10^(-10)} ,
Ø ∆v = 7.29 x 10^6 m/s Answer .
5 ) In pure capacitive circuit , current is ………… the voltage .
A ) lagging , B ) leading ,
C ) None of these ,
Correct Answer : - B ) leading ,
Voltage lags current by 90 degree .
Now go to online quiz section and Physics Quiz 6 is uploaded related to these mcqs , so check your preparation by this link : -
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