Rotational Motion-Quiz-8

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background.

Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced.

Q1. A small block of mass M moves with velocity 5 ms-1 towards n another block of same mass M placed at a distance of 2 m on a rough horizontal surface. Coefficient of friction between the block and ground is 0.25. Collision between the two blocks is elastic, the separation between the blocks, when both of them come to rest, is
•  3m
•  4m
•  2m
•  1.5m
Solution

Q2.A horizontal platform is rotating with uniform angular velocity around the vertical axis passing through its centre. At some instant of time a viscous fluid of mass ‘m’ is dropped at the centre and is allowed to spread out and finally fall. The angular velocity during this period
•  Decreases continuously
•  Decreases initially and increases again
•  Remains unaltered
•  Increases continuously
Solution

Q3.  Two blocks m1 and m2 (m2>m1) are connected with a spring of force constant k and are inclined at a angel Î¸ with horizontal. If the system is released from rest, which one of the following statements is/are correct?

•  Maximum compression in the spring ((m1+m2)g sin Î¸)/k if there is no friction anywhere
•  There will be no compression or elongation in the spring if there is no friction any where
•  If m1 is smooth and m2 is rough there will be compression in the spring
•  Maximum elongation in the spring is ((m1-m2 )g sinÎ¸)/k if all the surfaces are smooth
Solution

Q4. A cylinder rolls up an inclined plane, reaches some height, and then rolls down (without slipping throughout these motions). The directions of the frictional force acting on the cylinder are
•  Up the incline while ascending and down the incline while descending
•  Up the incline while ascending as well as descending
•  Down the incline while ascending and up the incline while descending
•  Down the incline while ascending as well as descending
Solution

Q5.If the moment of inertia of a disc about an axis tangential and parallel to its surface be I, then what will be the moment of inertia about the axis tangential but perpendicular to the surface?
•  6/5 I
•  3/4 I
•  3/2 I
•  5/4 I
Solution

Q6. A ring of radius r and mass m rotates about an axis passing through its centre and perpendicular to its plane with angular velocity Ï‰. Its kinetic energy is
•  mrÏ‰2
•  mrÏ‰2/2
• mr2 Ï‰2
•  (mr2 Ï‰2)/2
Solution

Q7.The moment of inertia of wheel about the axis of rotation is 3.0 MKS units. Its kinetic energy will be 600 J if period of rotation is
•  0.05 s
•  0.314 s
•  3.18 s
•  20 s
Solution

Q8.A spherical shell has mass M and radius R. Moment of inertia about its diameter will be
•  2/5 MR2
•  2/3 MR2
•  1/2 MR2
•  MR2
Solution

Q9.

A ‘T’ shaped object with dimensions shown in the figure, is lying on a smooth floor. A force ‘F’ is applied at the point P parallel to AB, such that the object has only the translational motion without rotation. Find the location of P with respect to C
•  4/3 l
•  l
•  2/3 l
•  3/2 l
Solution

Q10. 80. Moment of inertia of a thin rod of mass M and length L about an axis passing through its centre is (ML2)/M. Its moment of inertia about a parallel axis at a distance of L/4 from this axis is given by
•  (ML2)/48
•  (ML3)/48
•  (ML2)/12
• (7ML2)/48
Solution

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