Sample paper 2
Question 1
Force acting on an object is given as
F = Xx
-1
(Where x is the distance by which the body is displaced due to the applied force)
What would be the dimensional formula for X?
A.
MLT
-2
B.
MLT
-1
C.
M
-1
LT
-1
D.
M
-1
L
2
T
-1
E.
ML
2
T
-2
Correct Answer: E
Explanation:
From dimensional analysis we know that dimensional formula of the left hand side of an expression
should be the same as the dimensional formula of the individual quantities on the right hand side.
Force has the SI unit of kgms
-2
. Therefore, the dimensional formula of force becomes MLT
-2
.
Dimensional formula of x is L. Hence, dimensional formula of x
-1
becomes L
-1
. As said earlier, Xx
-
1
should have the same dimensional formula as F. Therefore, it can be written as
MLT
-2
= X * L
-1
X = ML
2
T
-2
Therefore, E is the correct answer option.
Question 2
Consider the figure and the statements given below.
(v is velocity and t is time)
The graph is for a body that is accelerating
The graph is for a body that is falling freely
The graph is for a body that has constant velocity