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Physics -Circular Motion -I (Grade XII)

Quiz by Manju Shekhawat

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50 questions
Show answers
  • Q1

    Keeping the banking angle of the road constant, the maximum safe speed of passing vehicles is to be increased by 10%. The radius of curvature of the road will have to be changed from 20 m to

    18 m

    24.20 m

    30.5 m

    16 m

    30s
  • Q2

    A mass m is attached to a thin wire and whirled in a vertical circle. The wire is most likely to break when

    inclined at an angle of 60° from vertical

    the wire is horizontal

    the mass is at the lowest point

    the mass is at the highest point

    30s
  • Q3

    A car moves on a circular road, describing equal angles about the centre in equal intervals of times. Which of the statements about the velocity of car is true

    both magnitude and direction of velocity change

    velocity is constant

    velocity is directed towards the centre of  circle

    magnitude of velocity is constant but the direction of velocity change

    30s
  • Q4

    An insect trapped in a circular groove of radius 12 cm moves along the groove steadily and completes 7 revolutions in 100 s. What is the linear speed of the motion

    0.44 cm/s 

    2.3 cm/s 

    none of these

    5.3 cm/s

    30s
  • Q5

    A particle moves in a circle of the radius 25 cm at two revolutions per second. The acceleration of the particle in m/sec2 is

    Answer Image
    Answer Image
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    30s
  • Q6

    A particle moves in a circle describing equal angle in equal times, its velocity vector

    change in direction 

     change in magnitude

    changes in magnitude and direction

    remains constant

    30s
  • Q7

    A mass of 2 kg is whirled in  a horizontal circle by means of a string at an initial speed of 5 r.p.m.  Keeping the radius constant the tension in the string is doubled. The new speed is nearly

    10 r.p.m.

    20 r.p.m.

    14 r.p.m.

    7 r.p.m.

    30s
  • Q8

    A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle. The motion of the particle takes place in a plane. It follows, that

    its velocity is constant

    its K.E. is constant

    its acceleration is constant

    its acceleration is constant

    30s
  • Q9

    If the equation for the displacement of a particle moving on a circular path is given by (q) = 2t3 + 0.5, where q is in radians and t in seconds, then the angular velocity of the particle after 2 s from its start is

    8 rad/s

    12 rad/s

    24 rad/s

    36 rad/s

    30s
  • Q10

    A body moves with constant angular velocity on a circle. Magnitude of angular acceleration

    Zero

    None of the above

    Answer Image

    Constant

    30s
  • Q11

    A particle of mass (m) revolving in horizontal circle of radius (R) with uniform speed v. When particle goes from one end to other end of diameter, then

    K.E. change by mv2

    no change in momentum

    change in momentum is 2 mv

    Answer Image
    30s
  • Q12

    A stone is tied to one end of string 50 cm long and is whirled in a horizontal circle with constant speed. If the stone makes 10 revolutions in 20 s, then what is the magnitude of acceleration of the stone

    990 cm/s2

    493 cm/s2

    860 cm/s2

    720 cm/s2

    30s
  • Q13

    For a particle in a non uniform accelerated circular motion 

    velocity is tangential and acceleration is radial only

    velocity is radial and acceleration is tangential only

    velocity is tangential and acceleration has both radial and tangential components

    velocity is radial and acceleration has both radial and tangential components

    30s
  • Q14

    The angular velocity of a particle rotating in a circular orbit 100 times per minute is

    1.66 rad / s

    60 degree / s

    10.47 rad / s

    10.47 degree / s

    30s
  • Q15

    Two particles having mass 'M' and 'm' are moving in a circular path having radius R and r. If their time period are same then the ratio of angular velocity will be

    Answer Image
    Answer Image
    Answer Image

    1

    30s

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