NEET 2017 | Rotational Motion Question 21 | Physics

NEET 2017

MCQ (Single Correct Answer)

-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?

0.25 rad s^$$-$$2

25 rad s^$$-$$2

5 m s^$$-$$2

25 m s^$$-$$2

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

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

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

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

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

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

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