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Rotational Motion Quiz-1

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 uniform rod AB of length l and mass m is free to rotate about point A. The rod is released from rest in horizontal position. Given that the moment of inertia of the rod about A is (ml2)/3 the initial angular acceleration of the rod will be
•  2g/3l
•  mg l/2
•  3/2 gl
•  3g/2l
Solution

Q2.Two boys of masses 10 kg and 8 kg are moving along a vertical rope, the former climbing up with acceleration of 2 ms-1. 2 while later coming down with uniform velocity of 2 ms-1. Then tension in rope at fixed support will be
•  200 N
•  120 N
•  180 N
•  160 N
Solution

Q3.  Four spheres of diameter 2 a and mass M are placed with their centres on the four corners of a square of side b. Then the moment of inertia of the system about an axis along one of the sides of the square is
•  4/5 M a2+2M b2
•  8/5 M a2+2M b2
•  8/5 M a2
•  4/5 M a2+M b2
Solution

(b)

We calculate moment of inertia of the system about

Q4. From a circular ring of mass M and R, an arc corresponding to a 900sector is removed. The moment of inertia of the remaining part of the ring about an axis passing through the ring and perpendicular to the plane of ring is k times MR2. Then the value of k is
•  3/4
•  7/8
•  1/4
•  1
Solution

Q5.The ratio of rotational and translatory kinetic energies of a sphere is
•  2/9
•  2/7
•  2/5
•  7/2
Solution

Q6. Angular momentum is conserved
•  Always
•  Never
• When external force is absent
•  When external torque is absent
Solution
(D)

Q7.When a ceiling fan is switched off, its angular velocity falls to half while it makes 36 rotations. How many rotations will it make before coming to rest?
•  24
•  36
•  18
•  12
Solution

Q8.A circular disc X of radius R is made from an iron plate of thickness t, and another disc Y of radius 4R is made from an iron plate of thickness t/4. Then the relation between the moment of inertia Ixand Iy is
•  Iy=32 Ix
•  Iy=16 Ix
•  Iy= Ix
•  IY= 64 Ix
Solution

Q9.A circular disc rolls down an inclined plane. The ration of rotational kinetic energy to total kinetic energy is
•  1/2
•  1/3
•  2/3
•  3/4
Solution

Q10. The angular momentum of a particle describing uniform circular motion in L. If its kinetic energy is halved and angular velocity doubled, its new angular momentum is
•  4L
•  L/4
•  L/2
• 2L
Solution
(B)

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