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 : -
