NEET 2017 | Rotational Motion Question 25 | Physics

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

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 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

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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Human Health and Diseases Body Fluids and Its Circulation Locomotion and Movement Neural Control and Coordination Reproduction in Organisms Reproductive Health Structural Organisation in Animals Digestion and Absorption Excretory Products and Their Elimination Chemical Coordination and Integration Human Reproduction Animal Kingdom Breathing and Exchange of Gases Evolution