1
JEE Main 2014 (Offline)
MCQ (Single Correct Answer)
+4
-1
A bob of mass $$m$$ attached to an inextensible string of length $$l$$ is suspended from a vertical support. The bob rotates in a horizontal circle with an angular speed $$\omega \,rad/s$$ about the vertical. About the point of suspension:
A
angular momentum is conserved
B
angular momentum changes in magnitude but not in direction.
C
angular momentum changes in direction but not in magnitude.
D
angular momentum changes both in direction and magnitude.
2
JEE Main 2014 (Offline)
MCQ (Single Correct Answer)
+4
-1
When a rubber-band is stretched by a distance $$x$$, it exerts restoring force of magnitude $$F = ax + b{x^2}$$ where $$a$$ and $$b$$ are constants. The work done in stretching the unstretched rubber-band by $$L$$ is :
A
$$a{L^2} + b{L^3}$$
B
$${1 \over 2}\left( {a{L^2} + b{L^3}} \right)$$
C
$${{a{L^2}} \over 2} + {{b{L^3}} \over 3}$$
D
$${1 \over 2}\left( {{{a{L^2}} \over 2} + {{b{L^3}} \over 3}} \right)$$
3
JEE Main 2014 (Offline)
MCQ (Single Correct Answer)
+4
-1
A block of mass $$m$$ is placed on a surface with a vertical cross section given by $$y = {{{x^3}} \over 6}.$$ If the coefficient of friction is $$0.5,$$ the maximum height above the ground at which the block can be placed without slipping is:
A
$${1 \over 6}m$$
B
$${2 \over 3}m$$
C
$${1 \over 3}m$$
D
$${1 \over 2}m$$
4
JEE Main 2014 (Offline)
MCQ (Single Correct Answer)
+4
-1
From a tower of height H, a particle is thrown vertically upwards with a speed u. The time taken by the particle, to hit the ground, is n times that taken by it to reach the highest point of its path. The relation between H, u and n is:
A
2gH = n2u2
B
gH = (n - 2)2u2
C
2gH = nu2(n - 2)
D
gH = (n - 2)u2
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