## Rotational Motion Quiz-4

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. If there is change of angular momentum from J to 5 J in 5 s, then the torque is
•  3J/5
•  4J/5
•  5J/4
•  None of These
Solution

Q2.A tennis ball bounces down flight of stairs striking each step in turn and rebounding to the height of the step above. The coefficient of restitution has a value
•  1/2
•  1
•  1/√2
•  1/2√2
Solution

Q3.  Two solid discs of radii r and 2r roll from the top of an inclined plane without slipping. Then
•  The bigger disc will reach the horizontal level first
•  The smaller disc will reach the horizontal level first
•  The time difference of reaching of the discs at the horizontal level will depend on the inclination of the plane
•  Both the discs will reach at the same time
Solution

Q4. A thin circular ring of mass m and radius R is rotating about its axis with a constant angular velocity Ï‰. Two objects each of mass M are attached gently to the opposite ends of a diameter of the ring the ring. The ring now rotates with an angular velocity Ï‰' is equal to
•  Ï‰(m+2M)/m
•  Ï‰(m-2M)/((m+2M))
•  Ï‰m/((m+M))
•  Ï‰m/((m+2M))
Solution

Q5.Three bricks each of length L and mass M are arranged as shown from the wall. The distance of the centre of mass of the system from the wall is

•  L/4
•  L/2
•  (3/2)L
•  (11/12)L
Solution

Q6. A 2 kg body and a 3 kg body are moving along the x-axis. At a particular instant the 2 kg body has a velocity of 3 ms-1and the 3 kg body has the velocity of 2 ms-1. The velocity of the centre of mass at that instant is
•  5ms-1
•  1ms-1
• Zero
•  None of These
Solution

Q7.A thin rod of length L and mass M is bent at the middle point O at an angle of 60°. The moment of inertia of the rod about an axis passing through O and perpendicular to the plane of the rod will be
•  (ML2)/6
•  (ML2)/12
•  (ML2)/24
•  (ML2)/3
Solution

Q8.A circular platform is free to rotate in a horizontal plane about a vertical axis passing through its centre. A tortoise is sitting at the edge of the platform. Now, the platform is given an angular velocity Ï‰00. When the tortoise moves along a chord of the platform with a constant velocity (with respect to the platform), the angular velocity of the platform Ï‰(t) will vary with time t as
•

•

•

•

Solution

Q9.Moment of inertia of a disc about an axis which is tangent and parallel to its plane is I. Then the moment of inertia of disc about a tangent, but perpendicular to its plane will be
•  3I/4
•  5I/6
•  3I/2
•  6I/5
Solution

Q10. Four particles of mass 1 kg, 2 kg, 3 kg and 4 kg are placed at the corners A,B,C and D respectively of a square ABCD of edge X-axis and edge AD is taken along Y-axis, the co-ordinates of centre of mass in SI is
•  (1,1)
•  (5,7)
•  (0.5,0.7)
• None of these
Solution

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