Assertion:  When a charged particle moves in a circular

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

181.

Universal time is based on

  • rotational effect of the earth about its axis

  • vibrations of cesium atom

  • orbital motion of the earth around the sun

  • oscillation of quartz crystal


182.

A liquid of density 800 kg/m3 is filled in a cylindrical vessel upto a height of 3 m. This cylindrical vessel stands on a horizontal plane. There is a circular hole on the side of the vessel. What should be the minimum diameter of the hole to move the vessel on the floor, if plug is removed. Take the coefficient of friction between the bottom of the vessel and the plane as 0.5 and total mass of vessel plus vessel as 95 kg.

  • 0.107 m

  • 0.053 m

  • 0.206 m

  • 0.535 m


183.

The figure shows a horizontal force F acting on a block of mass M on an inclined plane (angle θ).  What is the normal reaction N on the block?

     

  • mg sinθ + F cosθ

  • mg sinθ - Fcosθ

  • mg cosθ - F sinθ

  • mg cosθ + F sinθ


184.

Assertion:  Pseudo force is an imaginary force which is recognised only by a non-inertial observer to explain the physical situation according to Newton's laws.

Reason: Pseudo force has no physical origin, i.e., it is not caused by one of the basic interactions in nature. It does not exist in the action-reaction pair.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


Advertisement
Advertisement

185.

Assertion:  When a charged particle moves in a circular path. It produces electromagnetic wave.

Reason:  Charged particle has acceleration

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false


A.

If both assertion and reason are true and reason is the correct explanation of assertion.

Magnetic forces can cause charged particles to move in circular or spiral paths. Particle accelerators keep protons following circular paths and magnetic force. The magnetic force is perpendicular to the velocity and so velocity changes in direction but not in magnitude.

Accelerated charges radiate electromagnetic waves.


Advertisement
186.

The radii of circular paths of two particles of same mass are in ratio 6 : 8 then what will be velocities ratio if they have a constant centripetal force?

  • 3 : 4

  • 4  : 3

  • 2  : 3

  • 3  :  2


187.

Assertion:  Use of ball bearing between two moving parts of a machine is a common practice. 

Reason:  Ball bearing reduces rolling friction and provides good stability.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion. 

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


188.

Assertion:  Centripetal force is always required for motion in curved path. 

Reason:  On a banked curved track, vertical component of normal reaction provides the necessary centripetal force.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


Advertisement
189.

A block of mass 2 kg is placed on the floor. The coefficient of static friction is 0·4. If a force of 2·8 N is applied on the block parallel to the floor, the force of friction between the block and the floor is (g = 10 ms-2 )

  • 2·8 N

  • 2 N

  • 8 N

  • Zero


190.

A cyclist is moving in a circular track of radius 80 m with a velocity of 36 km h-1. He has to lean from the vertical approximately through an angle (Take g = 10 m s-2 )

  • tan-1 (4)

  • tan-1(1/8)

  • tan-1(1/4)

  • tan-1(2)


Advertisement