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 ,
Now go to online quiz section and Physics Quiz 13 is uploaded related to these mcqs , so check your preparation by this link : -
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