1
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
The vectors $$\overrightarrow A $$ and $$\overrightarrow B $$ are such that $$\left| {\overrightarrow A + \overrightarrow B } \right| = \left| {\overrightarrow A - \overrightarrow B } \right|.$$ The angle between the two vectors is
A
45o
B
90o
C
60o
D
75o
2
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
A 0.5 kg ball moving with a speed of 12 m/s strikes a hand wall at an angle of 30o with the wall. It is reflected with the same speed at the same angle. If the ball is in contact with the wall for 0.25 seconds, the average force acting on the wall is :
A
96 N
B
48 N
C
24 N
D
12 N
3
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
For angles of projection of a projectile at angle (45o $$-$$ $$\theta $$) and (45o + $$\theta $$), the horizontal range described by the projectile are in the ratio of
A
2 : 1
B
1 : 1
C
2 : 3
D
1 : 2.
4
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
A uniform rod AB of length $$l$$ and mass m is free to rotate about point A. The rod is released from rest in the horizontal position. Given that the moment of inertia of the rod about A is ml2/3, the initial angular acceleration of the rod will be

A
$${{mgl} \over 2}$$
B
$${3 \over 2}gl$$
C
$${{3g} \over {2l}}$$
D
$${{2g} \over {3l}}$$