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/sec

^{2}is30s - 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) = 2t

^{3}+ 0.5, where q is in radians and t in seconds, then the angular velocity of the particle after 2 s from its start is8 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 mv

^{2}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/s

^{2}493 cm/s

^{2}860 cm/s

^{2}720 cm/s

^{2}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