Engineering Physics by Amal Chakraborty. We covered all the Engineering Physics by Amal Chakraborty in this post for free so that you can practice well for the exam.
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Mock Test on Engineering Physics for Students
In which of the following bodies rotational K.E. is equal to translational K.E. :
(A) Ring
(B) Disc
(C) Sphere
(D) All of these
Option a – Ring
A flywheel has a moment of inertia of 4 kg m² and a K.E. of 200 J. Calculate the number of revolutions it makes before coming to rest. If opposing couple 5 Nm is applied to it :
(A) 12.8 rev
(B) 24 rev
(C) 6.4 rev
(D) 16 rev
Option c – 6.4 rev
A flywheel of the moment of inertia 0.32 kg m² is rotated steadily at 120 rad/s by a 50 W electric motor. The K.E. of the flywheel is :
(A) 4608 J
(B) 1152 J
(C) 2304 J
(D) 6952 J
Option c – 2304 J
A body of moment of inertia 3 kg m² rotating with an angular velocity of 2 rad/s has the same kinetic and mass of 12 kg moving with velocity energy of
(A) 1 m/s
(B) 2 m/s
(C) 4 m/s
(D) 8 m/s
Option a – 1 m/s
A thin uniform ring of mass 10 kg and radius 0.5 m is rotating about an axis through its center and perpendicular to the plane with 600 rpm then the kinetic energy of the rotating ring :
(A) 9860 J
(B) 4930 J
(C) 493 J
(D) 9.86 J
Option b – 4930 J
The moment of inertia of a body about a given axis is 1.2 kg m² and it is at rest. An angular acceleration of 25 rad/s² is applied to generate a K.E. of 1500 J in the body. The duration for which acceleration is applied is :
(A) 4 s
(B) 2 s
(C) 8 s
(D) 10 s
Option b – 2 s
A particle performs circular motion, and the direction of its linear momentum is :
(A) Tangential
(B) Radial
(C) Centripetal
(D) Makes an angle of 45° with tangent
Option a – Tangential
The moment of inertia of the wheel about an axis of rotation is 3 in the Sl unit. Its K.E. will be 600 J if the period of rotation is :
(A) 0.05 s
(B) 0.314 s
(C) 3.18 s
(D) 20 s
Option b – 0.314 s
A spherical solid ball of mass 1 kg and radius 3 cm is rotating about an axis passing through its center with an angular velocity of 50 rad/s. The kinetic energy of rotation is :
(A) 4500 J
(B) 90 J
(C) 9/8 J
(D) 9/20 J
Option d – 9/20 J
A sphere rotating about its diameter has a rotational kinetic energy of 360 J. If its angular speed is 30 rad/s its moment of inertia is :
(A) 0.4 kg m²
(B) 0.6 kg m²
(C) 0.8 kg m²
(D) 1.2 kg m²
Option c – 0.8 kg m²
A flywheel is in the form of a uniform circular disc of radius 1 m and mass 2 kg. The work which must be done on it to increase its frequency of rotation from 5 to 10 rev/s is approximate:
(A) 1.5×10² J
(B) 3.0×10² J
(C) 1.5×10³ J
(D) 3.0×10³ J
Option c – 1.5×10³ J
A wheel of mass 2 kg, having practically all the mass concentrated along the circumference of a circle of radius 20 cm is rotating on its axis with an angular velocity of 100 rad/s. The rotational K.E. of the wheel is :
(A) 4 J
(B) 70 J
(C) 400 J
(D) 800 J
Option c – 400 J
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