There are 3 bulbs of 600 W , 200 W , 300 W . Which bulb has thickest filament ? A ) 200 W , B ) 300 W , C ) 600 W , D ) None of these ,

 1 )  There are 3 bulbs of 600 W , 200 W , 300 W . Which bulb has thickest filament ?

A ) 200 W ,                                                          B ) 300 W ,

C ) 600 W ,                                                          D ) None of these ,

Correct Answer : -  A ) 200 W ,  

Because power is inversely proportional to thickness of a bulb .  So less power , more thickness .  And 200 W bulb has less power and more thickness .

 

2 )  The Earth rotates at a moderate angular velocity of  ………… ( 7.29211 x 10^(-5)  red/sec ) .

 

3 )  Maximum velocity of mass spring system is  ………. ( v˳ = x˳ * √(k/m) ) .

 

4 )  Kinetic energy if electron in Coolidge tube is proportional to ………..

(Accelerating potential ) .    K.E = ev   .

 

5 )  The period of satellite in an orbit of radius R is T . So what will be time period , if radius is 4R ?

A ) increase by 2 times ,                          B ) increase by 4 times ,

C ) increase by 8 times ,                          D ) increase by 10 times ,

Correct Answer : -  C ) increase by 8 times ,

Solution : -

 

6 )  If the tensile force is suddenly removed from a wire , then its temperature will …………. ?

A ) increased ,                                                    B ) decrease ,

C ) no change ,                                                  D ) None of these ,

Correct Answer : -   A ) increased ,

 

7 )  Angle between the coil of 3 phase is ………. ?

A ) 0 degree ,                                                      B ) 90 degree ,

C ) 120 degree ,                                                 D ) 180 degree ,

Correct Answer : -  C ) 120 degree ,   

 

8 ) Real and virtual mass of a photon is zero .

 

9) The far point for normal eye is ……….. ( 25 cm ) .

Our eye can see 25 cm to infinity .

 

10 ) A particle executing SHM have maximum velocity at …….. ,

A ) mean position ,                                   B ) extreme position ,

C ) same at everywhere ,                        D ) None of these ,

Correct Answer : -  A ) mean position ,

 

11 ) Equation of continuity : -    ρAV = ρʹAʹVʹ  .

So  ,   A/Aʹ = Vʹ/V  ,

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