Physics -Circular Motion -I (Grade XII)
Quiz by Manju Shekhawat
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- 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
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
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
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
1
30s
