Which of the following statement(s) is true in accordance to the given figure?
A.
2
B.
1
C.
3
D.
Both 1 and 2
E.
Both 2 and 3
Correct Answer: A
Explanation:
The graph given in the question is between velocity and time. Slope of the velocity time graph is
linear here. Therefore, velocity increases with each instant but change in velocity per unit time is
constant throughout the travel. Thus, 3 is an incorrect statement and so is option C. Acceleration of
a body is defined as the rate of change of velocity per unit time. As said earlier, for a linear slope
between velocity and time, change in velocity is constant per unit time and thus, acceleration is
constant for the entire travel. Therefore, statement 1 isincorrect and so is option B. A body falls
freely under gravity only. A free falling body always experiences uniform acceleration throughout
the travel. Thus, we can say that acceleration is constant for a free fall and the graph essentially
represents the motion of free fall. Thus, statement 2 is correct and so A is the correct answer option.
In view of the above discussion, options D and E are incorrect as well.
Question 3
If a block of wood weighs 1000 N, what would be its mass?
A.
102.04 kg
B.
10.24 kg
C.
1020.44 kg
D.
1.24 kg
E.
110.24 kg
Correct Answer: A
Explanation:
Weight of a body is given as
W = mg -------------- (1)
Putting the value of W and g in equation 1 we get
1000 = m * 9.8
m = 102.04 kg
Therefore, A is the correct answer option.
