Please wait...

Physics Test 186
Menu grid icon
Result Result point icon
Physics Test 186
  • Goals icon

    /

    Score
  • Trophy icon

    -

    Rank
White alarm icon Time Taken: -
Result frame illustration
  • Question 1/10
    4 / -1

    A circular disc A of radius r is made from an iron plate of thickness t, and another circular disc B of radius 4r is made from an iron plate of thickness t/4. The relation between the moments of inertia IA and IB is

    Solutions

    First of all, we will find the mass of the disc which can be found by the fornula

    mass = density * volume

    Volume = R2  (t = thickness)

    density = ρ

     

  • Question 2/10
    4 / -1

    A solid homogeneous sphere is moving on a rough horizontal surface, partly rolling and partly sliding. During this kind of motion of the sphere

    Solutions

    Angular momentum about point of contact is conserved because torque due to friction about point of contact will be zero.

     

  • Question 3/10
    4 / -1

    A sphere of mass m and radius r rolls on a horizontal plane without slipping with the speed u. Now, if it rolls up vertically, the maximum height it would attain will be

    Solutions

    The rolling sphere has rotational as well as translational kinetic energy.

     

  • Question 4/10
    4 / -1

    The wheels on the old-time bicycle shown in the diagram have radii of 60.0 cm. and 10.0 cm. If the larger wheel is rotating at 12.0 rad s-1, what is the angular speed of the smaller wheel?

    Solutions

    The linear velocity of both wheels will be the same

    60 × 12 = 10×ω

    ω = 72 rad s−1

     

  • Question 5/10
    4 / -1

    Angular momentum is conserved

    Solutions

    According to the law of conservation of angular momentum, if there is no external torque on the system, then the angular momentum remains constant.

     

  • Question 6/10
    4 / -1

    If the earth shrinks such that its mass does not change but radius decreases to one-quarter of its original value then one complete day will take

    Solutions

     

  • Question 7/10
    4 / -1

    A solid sphere rolls down two different inclined planes of same height, but of different inclinations. In both cases,

    Solutions

    In pure rolling, mechanical energy remains conserved. Therefore, when heights of inclines are equal, speed of sphere will be same in both the cases. But as acceleration down the plane, a ∝ sinθ therefore, acceleration and time of descent will be different

     

  • Question 8/10
    4 / -1

    The angular speed of rotating rigid body is increased from 4ω to 5ω keeping moment of inertia constant. The percentage increase in its K.E is -

    Solutions

     

  • Question 9/10
    4 / -1

    The radius of a solid sphere is R and its density D. When it is made to rotate about an axis passing through any diameter of sphere, expression for its moment of inertia is

    Solutions

     

  • Question 10/10
    4 / -1

    The equation τ = Iα is valid about which of the following?

    Solutions

    The equation τ = Iα is valid about COM or axis of rotation but not about any other point.

     

Close button icon
User Profile
-

Correct (-)

Wrong (-)

Skipped (-)

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
Mockers logo Get latest Exam Updates
& Study Material Alerts!
No, Thanks
Arrow pointer icon
Click on Allow to receive notifications
Notification bell icon ×
Open Now