1 ) Electric field on unit positive ( + ve ) charge at the centre of sphere is . . . . . . . . , A ) finite , B ) infinite , C ) zero , D ) None of these ,

1 ) Electric field on unit positive ( + ve )  charge at the centre of sphere is . . . . . . . . ,

A ) finite ,                                                                   B ) infinite ,

C ) zero ,                                                                    D ) None of these ,

Correct Answer : -   C ) zero ,

 

2 ) The electric field due to an infinitely long thin wire at a distance R varies as : -  1 / R .

 

3 ) 1 Tesla = . . . . . . . . . . . . ,

A ) weber / m .                                                                      B ) weber / m² ,

C ) m / weber .                                                                      D ) None of these ,

Correct Answer : -   B ) weber / m² ,

 

4 ) Number of beats per second is equal to the magnitude of difference between . . . . . . . . . . . . of turning fork .

A ) frequency ,                                                          B ) amplitude ,

C ) speed ,                                                                 D ) None of these ,

Correct Answer : -  A ) frequency ,

Number of beats per second is equal to the magnitude of difference between frequency of turning fork .

f1 – f2 = n

 

5 ) Fundamental frequency : - f = ( 1 / 2π ) x  √ ( T / M ) .

 

6 )  Law of conservation of energy : -

K.Ei + P.Ei  =  K.Ef + P.Ef  ,

 

7 ) In-elastic collision , which is conserved ?

A ) momentum ,                                                                    B ) kinetic energy ,

C ) both of these ,                                                                D ) None of these ,

Correct Answer : -  A ) momentum ,

 

8 ) Elastic collision is a collision in which . . . . . . . . . . . . . . is conserved .

A ) momentum ,                                                                    B ) kinetic energy ,

C ) both of these ,                                                    D ) None of these ,

Correct Answer : -   C ) both of these ,

 

9 ) A communication satellite of earth which takes 24 hours to complete orbit eventually has to be replaced by another satellite of double mass .  If the new satellite has orbital time period of 24 hours . Then what is the ratio of radius of new orbit to original orbit : -

A ) 1 : 1 ,                                                                    B ) 2 : 1 ,

C ) 1 : 2 ,                                                                    D ) None of these ,

Correct Answer : -   A ) 1 : 1 ,

Solution : -