1
NEET 2018
MCQ (Single Correct Answer)
+4
-1
The moment of the force, $$\overrightarrow F = 4\widehat i + 5\widehat j - 6\widehat k$$ at
(2, 0, –3), about the point (2, –2, –2), is given by
A
$$ - 8\widehat i - 4\widehat j - 7\widehat k$$
B
$$ - 4\widehat i - \widehat j - 8\widehat k$$
C
$$ - 7\widehat i - 8\widehat j - 4\widehat k$$
D
$$ - 7\widehat i - 4\widehat j - 8\widehat k$$
2
NEET 2017
MCQ (Single Correct Answer)
+4
-1
Two discs of same moment of inertia rotating about their regular axis passing through centre and perpendicular to the plane of disc with angular velocities $${\omega _1}$$ and $${\omega _2}$$. They are brought into contact face to face coinciding the axis of rotation. The expression for loss of energy during this process is
A
$${1 \over 4}I{\left( {{\omega _1} - {\omega _2}} \right)^2}$$
B
$$I{\left( {{\omega _1} - {\omega _2}} \right)^2}$$
C
$${1 \over 8}I{\left( {{\omega _1} - {\omega _2}} \right)^2}$$
D
$${1 \over 2}I{\left( {{\omega _1} + {\omega _2}} \right)^2}$$
3
NEET 2017
MCQ (Single Correct Answer)
+4
-1
A rope is wound around a hollow cylinder of mass 3 kg and radius 40 cm. What is the angular acceleration of the cylinder if the rope is pulled with a force of 30 N?
A
0.25 rad s$$-$$2
B
25 rad s$$-$$2
C
5 m s$$-$$2
D
25 m s$$-$$2
4
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
Two rotating bodies A and B of masses m and 2m with moments of inertia $${I_A}$$ and $${I_B}$$ ($${I_B}$$ > $${I_A}$$) have equal kinetic energy of rotation. If LA and LB be their angular momenta respectively, then
A
$${L_A} = {{{L_B}} \over 2}$$
B
$${L_A} = 2{L_B}$$
C
$${L_B} > {L_A}$$
D
$${L_A} > {L_B}$$
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