NEET 2017 | Rotational Motion Question 27 | Physics

NEET 2017

MCQ (Single Correct Answer)

-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

$${1 \over 4}I{\left( {{\omega _1} - {\omega _2}} \right)^2}$$

$$I{\left( {{\omega _1} - {\omega _2}} \right)^2}$$

$${1 \over 8}I{\left( {{\omega _1} - {\omega _2}} \right)^2}$$

$${1 \over 2}I{\left( {{\omega _1} + {\omega _2}} \right)^2}$$

NEET 2016 Phase 2

MCQ (Single Correct Answer)

-1

A light rod of length $$l$$ has two masses m₁ and m₂ attached to its two ends. The moment of inertia of the system about an axis perpendicular to the rod and passing through the centre of mass is

$${{{m_1}{m_2}} \over {{m_1} + {m_2}}}{l^2}$$

$${{{m_1} + {m_2}} \over {{m_1}{m_2}}}{l^2}$$

$$\left( {{m_1} + {m_2}} \right){l^2}$$

$$\sqrt {{m_1}{m_2}} \,{l^2}$$

NEET 2016 Phase 2

MCQ (Single Correct Answer)

-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 L_A and L_B be their angular momenta respectively, then

$${L_A} = {{{L_B}} \over 2}$$

$${L_A} = 2{L_B}$$

$${L_B} > {L_A}$$

$${L_A} > {L_B}$$

NEET 2016 Phase 2

MCQ (Single Correct Answer)

-1

A solid sphere of mass m and radius R is rotating about its diameter. A solid cylinder of same mass and same radius is also rotating about its geometrical axis with an angular speed twice that of the sphere. The ratio of their kinetic energies of rotation (E_sphere / E_cylinder) will be

2 : 3

1 : 5

1 : 4

3 : 1

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