## Rotational-Motion-Quiz-5

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.

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Q1. A body of moment of inertia of 3 kg-m2 rotating with an angular velocity of 2 rad/sec has the same kinetic energy as a mass of 12 kg moving a velocity of

•  8 m/s
•  0.5 m/s
•  2 m/s
•  1 m/s
Solution

Q2.Two bodies A and B of definite shape (dimensions of bodies are not ignored). A is moving with speed of 10 ms-1 and B is in rest, collide elastically. The

•  Body A comes to rest and B moves with speed of 10ms^(-1)
•  They may move perpendicular to each other
•  A and B come to rest
•  They must move perpendicular to each other
Solution

Q3.  Moment of inertia of a ring of mass M and radius R about an axis passing through the centre and perpendicular to the plane is I. What is the moment of inertia about its diameter
•  I
•  I/2
•  I/√2
•  I+MR2
Solution

Q4. A particle is projected with 200ms-1, at an angle of 60°. At the highest point it explodes into three particles of equal masses. One goes vertically upward with velocity 100ms-1, the second particle goes vertically downward with the same velocity as the first. Then what is the velocity of the third particle?
•  120 ms-1 with 60° angle
•  200 ms-1 with 30° angle
•  50 ms-1 upward
•  500 ms-1Horizontal
Solution

Q5.Two bodies of identical mass m are moving with constant velocity v but in the opposite directions and stick to each other, the velocity of the compound body after collision is
•  v
•  2v
•  0
•  v/2
Solution
(C)

Q6. What remains constant in the field of central force
•  Potential Energy
•  Kinetic Energy
• Angular momentum
•  Linear momentum
Solution
(C)

Q7.A bullet of mass m hits a target of mass M hanging by a string and gets embedded in it. If the block rises to a height h as a result of this collision, the velocity of the bullet before collision is
•  v=√2gh
•  v=√2gh (1+m/M)
•  v=(1+M/m) √2gh
•  v=√2gh (1-m/M)
Solution

Q8.The ratio of the radii of gyration of a circular disc to that of a circular ring, each of same mass and radius, around their respective axes is
•  √2 ∶1
•  √2 ∶√3
•  √3 ∶√2
•  1∶√2
Solution

Q9.(1) Centre of gravity (C. G.) of a body is the point at which the weight of the body acts (2) Centre of mass coincides with the centre of gravity if the earth is assumed to have infinitely large radius (3) To evaluate the gravitational field intensity due to any body at an external point, the centre mass of the body can be considered to be concentrated at its C.G. (4) The radius of gyration of any body rotating about an axis is the length of the perpendicular dropped from the C.G. of the body to the axis Which one of the following pairs of statements is correct
•  (4) and (1)
•  (1) and (2)
•  (2) and (3)
•  (3) and (4)
Solution

Q10. A binary star consists of two stars A (mass 2.2 Ms) and B (mass 11 Ms), where Ms is the mass of the sun. They are separated by distance d and are rotating about their centre of mass, which is stationary. The ratio of the total angular momentum of the binary star to the angular momentum of star B about the centre of mass is
•  7
•  6
•  9
• 10
Solution

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