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# NEET Physics  Circular Motion  Practice Q & A

1. A body is allowed to slide on a frictionless track from rest under–gravity. The track ends in a circular loop of diameter D. What should be the minimum height of the body in terms of D, so that it may successfully complete the loop?

 $\dfrac{4}{5}$ D $\dfrac{5}{4}$ D D 2D

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2. An electron revolve around the nucleolus the radius of the circular orbit is r to double the kinetic energy of electron its orbit radius of

 $\sqrt{2}$r –$\sqrt{2}$r $\sqrt{3}$r –$\sqrt{3}$r

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3. A body is traveling in a circle at constant speed. It

 has constant velocity. has no acceleration has an inward acceleration has an outward radial acceleration

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4. A body of mass 100 gram, tied at the end of a string of length 3 m rotates in a vertical circle and is just able to complete the circle. If the tension in the string at its lowest point is 3.7 N, then its angular velocity will be ______ (g = 10 m/s2)

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5. A particle P is moving in a circle of radius ‘a’ with uniform speed v. C is the centre of the circle and AP is diameter. The angular velocity of P about A and C are in the ratio
angular velocity of particle moving in circle.gif" alt="angular velocity of particle moving in circle" style="margin:0 auto;" />

 1 : 1 1 : 2 2 : 1 4 : 1

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6. A body of mass 500 gram is rotating in a vertical circle of radius 1 m. What is the difference in its kinetic energies at the top and the bottom of the circle?

 4.9 J 19.8 J 2.8 J 9.8 J

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7. The maximum velocity with which a driver must drive his car on a flat curved road of radius of curvature 150 m and coefficient of friction 0.6, to avoid the skidding of his car is (take g = 10 m/s2)

 60 m/s 50 m/s 40 m/s 30 m/s

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8. The driver of a car traveling at velocity v suddenly sees a broad wall in front of him at a distance a. He should

 break sharply turn sharply both a and b none of the above

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9. A body of mass m is suspended from a string of length l. What is the minimum horizontal velocity that should be given to the body in its lowest position so that it may complete full revolution in the vertical plane with the point of suspension at the center of circle?

 $\sqrt{2gl}$ $\sqrt{3gl}$ $\sqrt{4gl}$ $\sqrt{5gl}$

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10. A cyclist is moving in a circular track of radius 80 m, with a velocity of 36 km/hour. In order to keep his balance, he has to lean inwards from the vertical through an angle q. If g = 10 m/s2, then q is given by

 tan–1 (2) tan–1 (4) tan–1 $\dfrac{1}{4}$ tan–1 $\dfrac{1}{8}$

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