PHYSICS FOR NEET

EXERCISE-1
CIRCULAR MOTION
Q. 1 The angle between velocity vector and acceleration vector in uniform circular motion is
(1) 
(2) 
(3) 
(4) 

Q. 2 Two cyclists cycle along circular tracks of radii  and  at uniform rates. If both of then take same time to complete one revolution, then their angular speeds are in the ratio
(1) 
(2) 
(3) 
(4) 

Q. 3 Angular speed of a uniformly circulating body with time period is
(1) 
(2) 
(3) 
(4) 

Q. 4 An object moving in a circular path at constant speed has constant
(1) Energy
(2) Velocity
(3) Acceleration
(4) Displacement

Q. 5 Speed of an object moving in circular path of radius  with angular speed  is
(1) 
(2) 
(3) 
(4) 

Q. 6 A wheel is at rest. Its angular velocity increases uniformly and becomes 160 radian per second after 5 second. The total angular displacement is :
(1) 
(2) 
(3) 
(4) 

Q. 7 Two wheels having radii in the ratio  are connected by a common belt. If the smaller wheel is accelerated from rest at a rate  for . The velocity of bigger wheel is
(1) 
(2) 
(3) 
(4) None of these
.
Q. 8 A car wheel is rotated to uniform angular acceleration about its axis. Initially its angular velocity is zero. It rotates through an angle  in the first , in the next , it rotates through an additional angle , the ratio of is
(1) 1
(2) 2
(3) 3
(4) 5

Q. 9 When a particle moves in a circle with a uniform speed
(1) its velocity and acceleration are both constant
(2) its velocity is constant but the acceleration changes
(3) its acceleration is constant but the velocity changes
(4) its velocity and acceleration both change

Q. 10 The relation between an angular velocity, the position vector and linear velocity of a particle moving in a circular path is.
(1) 
(2) 
(3) 
(4) 



Q. 12 The angular speed of a fly wheel making 120 revolutions/minute is.
(1) 
(2) 
(3) 
(4) 

 Q. 13 The angular velocity of the second's needle in watch is-
(1) 
(2) 
(3) 
(4) 

Q. 14 The average acceleration vector in one revolution for a particle having a uniform circular motion is-
(1) A constant vector of magnitude 
(2) A vector of magnitude  directed normal to the plane of the given uniform circular motion.
(3) Equal to the instantaneous acceleration vector at the start of the motion.
(4) Anull vector.

Q. 15 A body performing uniform circular motion completed 140 revolution in a second. Its angular speed is
(1) 
(2) 
(3) 
(4) 

Q. 16 Centripetal acceleration of a cyclist completing 7 rounds in a minute along a circular track of radius  with a constant speed, is
(1) 
(2) 
(3) 
(4) 

Q. 17 An aircraft executes a horizontal loop of radius  with a speed of . Ratio of centripetal acceleration to acceleration due to gravity is
(1) 12.3
(2) 3.3
(3) 6.4
(4) None of these

Q. 18 If the frequency of an object in uniform circular motion is doubled, its acceleration becomes
(1) Two times
(2) Four times
(3) Half
(4) One fourth

Q. 19 A body is moving on a circle of radius  with a seed  which is decreasing at the rate  at an instant. The angle made by its acceleration with its velocity is
(1) 
(2) 
(3) 
(4) 

Q. 20 The distance of a particle moving on a circle of radius  measured from a fixed point on the circle and measured along the circle is given by  (in meters). The ratio of its tangential to centripetal acceleration at  is
(1) 
(2) 
(3) 
(4) 

Q. 21 A solid body rotates about a stationary axis so that its angular velocity depends on the rotational angle  as , where  and  are positive constants. At the moment , the time dependence of rotation angle is
(1) 
(2) 
(3) 
(4) 
.
Q. 22 Two particles  and  are located at distances  and  respectively from the axis of a rotating disc such that  :
(1) Both  and  have the same acceleration
(2) Both  and  do not have any acceleration
(3) P has greater acceleration than 
(4)  has greater acceleration than 

Q. 23 Let  and  represent radial and tangential acceleration. The motion of a particle may be circular if:
(1) 
(2) 
(3) 
(4) none of these

Q. 24 Astring breaks if its tension exceeds 10 newtons. A stone of mass 250 gm tied to this string of length 10  is rotated in a horizontal circle. The maximum angular velocity of rotation can be.
(1) 
(2) 
(3) 
(4) 

Q. 25 A particle moving along a circular path due to a centripetal force having constant magnitude is an example of motion with:
(1) constant speed and velocity
(2) variable speed and velocity
(3) variable speed and constant velocity
(4) constant speed and variable velocity.

Q. 26 The formula for centripetal acceleration in a circular motion is.
(1) 
(2) 
(3) 
(4) 

Q. 27 A stone is moved round a horizontal circle with a  long string tied to it. If centripetal acceleration is , then its angular velocity will be
(1) 
(2) 
(3) 
(4) 

Q. 28 A particle moves in a circular orbit under the action of a central attractive force inversely proportional to the distance '  '. The speed of the particle is.
(1) Proportional to 
(2) Independent of 
(3) Proportional to 
(4) Proportional to 

Q. 29 A particle of mass  is moving in a horizontal circle of radius  under a centripetal force equal to . The total kinetic energy of the particle is-
(1) 
(2) 
(3) 
(4) 

Q. 30 A particle of mass  is moving with constant velocity  on smooth horizontal surface. A constant force starts acting on particle perpendicular to velocity . Radius of curvature after force  start acting is :
(1) 
(2) 
(3) 
(4) none of these

Q. 31 If the radii of circular paths of two particles of same masses are in the ratio of , then in order to have same centripetal force, their speeds should be in the ratio of:
(1) 
(2) 
(3) 
(4) 

Q. 32 A particle is moving in a horizontal circle with constant speed. It has constant
(1) Velocity
(2) Acceleration
(3) Kinetic energy
(4) Displacement

Q. 33 The tension in the string revolving in a vertical circle with a mass  at the end when it is at the lowest position.
(1) 
(2) 
(3) 
(4) 

Q. 34 A motorcycle is going on an overbridge of radius R. The driver maintains a constant speed. As the motorcycle is ascending on the overbridge, the normal force on it :
(1) increase
(2) decreases