Which pair of following forces will never give a resultant force of 2 newtons ? (N stands for newton) A ) 2 N and 2 N , B ) 1 N and 1 N , C ) 1 N and 3 N , D ) 1 N and 4 N ,

1 ) Which pair of following forces will never give a resultant force of 2 newtons ? (N stands for newton)

A )  2 N and 2 N ,                            B )  1 N and 1 N ,

C )  1 N and 3 N ,                            D )  1 N and 4 N ,

Correct Answer : -  D )  1 N and 4 N ,

Solution : -

We have a simple trick to check whether a number is resultant or not : -

| A – B |  <=  R  <=  | A + B |  ,

So , first we put the values of option A ,

| 2 – 2 |  <=  R  <=  | 2 + 2 |  ,

0  <=  R  <=  4 ,

So all the values in between 0 and 4 , also including 0 and 4 are resultants .  So 2 is resultant . This option is incorrect .

Now , we put the values of option D ,

| 1 – 4 |  <=  R  <=  | 1 + 4 |  ,

| – 3 |  <=  R  <=  | 5 |  ,

Now values are under mode , so – ve sign will change into + ve .

3  <=  R  <=  5 ,

So all the values in between 3 and 5 , also including 3 and 5 are resultants .  So 2 is not resultant .  So , D option is correct .

 

2 ) If A = 8 N  and B = 5 N , which is not resultant of these forces ?

A )     2 ,                                            B ) 5 ,

C )     9 ,                                            D ) None of these ,

Correct Answer : -  A )        2 ,

Solution : -

We have a simple trick to check whether a number is resultant or not : -

| A – B |  <=  R  <=  | A + B |  ,

So , put the values ,

| 8 – 5 |  <=  R  <=  | 8 + 5 |  ,

3  <=  R  <=  13 ,

So all the values in between 3 and 13 , also including 3 and 13 are resultants .  So 2 in not a resultant .

 

3 ) Force – time graph represents . . . . . . . . . : -

A ) momentum ,                                                  B ) impulse ,

C ) Both of these ,                                              D ) None of these ,

Correct Answer : -  C ) Both of these ,

 

4 ) The ratio of volumetric stress to volumetric strain is called Bulk modulus .

 

5 ) Force acting upon a charged particle kept between plates of charged capacitor is f .  If one of plate of capacitor is removed . Force acting on Same particle will become : -

A )  f / 2 ,                                           B ) 2 f ,

C ) f / 4 ,                                          D ) None of these ,

Correct Answer : -   A )  f / 2 ,

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