Chapter 5 Rotational and Circular motion Mcqs
Federal board/ Punjab board/KPK board
Note: Answers after 10 short questions
1) The angular speed in radians/hours for
daily rotation of our earth is ?_
(a)2π
b)4π
c)
π
/6 d)
π/16
2) Linear acceleration a=rα when ‘ϴ’
is ________________.
(a)0o b)180o c)
360o d) 90o
3) What is moment of inertia of a sphere?
(a)1/6 (MR2 ) b) 1/12 (MR2 ) c) 1/12 M2R d)1/12 M2R
4) Artificial satellite moves around; ________________.
(a)Moon
b) sun
c)stars
d) Earth
5) A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of particle. The motion of the particle takes place in a horizontal plane.It follows.
(a)
Linear momentum is constant b) velocity
is constant
c)It moves in a circular
path d)None of these
6) A body moving in a circle with constant
speed has________________.
(a)constant acceleration b) constant retardation c) variable acceleration d) variable speed and constant velocity
7) Which one is constant for a satellite in
orbit?
(a)Velocity b) KE c)Angular Momentum d)Potential
energy
8) If the earth suddenly stops rotating the
value of ‘g’ at equator would: ________________.
(a)Decrease b) Remain unchanged c)increase
d) become zero
9) If solid sphere and solid cylinder of same
mass and density rotate about their own axis, the moment of inertia will be
greater for________________.
(a)
Solid sphere
b)solid cylinder
c)both d)equal both
(10) Weight of the
object at the centre of the earth is______________________
a)zero b.
Maximum c minimum
d Infinite
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1. d 2.d 3.c 4.d 5. c 6.a 7.c 8.c 9.b
10. a
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11) The ratio of
escape velocity to the critical orbital velocity ____________________.
12. If a body of mass
1kg is lifted upward with an acceleration of 9.8m/s2. Its apparent
weight will become ______________________.
(a)Zero newton b)
9.8newton (c) 19.6 newton
d) 100newton
13. The speed of disc
at the bottom of an inclined plane is ______________________________.
14) Which has no
effect in satellite’s orbiting?
(a)Distance of satellite from earth’s center b) Mass
of satellite c) Mass of earth d) gravitational constant G
15 ) A body of mass
2kg is suspended from the ceiling of an elevator moving up with an acceleration
g, its apparent weight in the elevator will be _____.
a)9.8N b)19.6N c) 39.2N d)zero
16) A man weight is standing on the ascending
elevator with an acceleration of ‘a’ the apparent weight of the man is ________________________.
a) W+ma b)W-ma c)W d)ma
17) If the radius
of earth is doubled then the value of critical velocity becomes __________________.
18 The orbital
velocity near surface of earth is given by:_________________
19 Close orbiting
satellite orbit the earth at a height of about __________________.
a) 400km b) 4000km c)400m d)400cm
20. The time period
of low flying satellite is __________________.
a) 84minutes b) 100 minutes c) 24 hours d) 365 days
Answers
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11.d 12.c 3.d 14.a 15. c 16.a 17.a 18.b 19.a 20.a
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21. The ratio of moment of inertia of disc
and hoop is__________________.
22 The __________________plays the same
role in angular motion as that of mass in linear motion.
a)angular acceleration b) Torque c) Moment of inertia d) Angular momentum
23. Inverse square law is given
by_____________________
a)
Einstein b) Newton c) Pascal d) None of these
24. 20kg
mass when falling freely, its weight becomes___________.
a)
9.8N b) 98N c) 196N d) zero
25. The
linear speed of point on its rim in m/s when a wheel 1m in diameter makes 30
rev min will be_______________________
a) π/2 b) π c) 2π d) 20 π
26.Work
done by centripetal force is ______________________________
a)
maximum b)minimum c) zero d) All of these
27-a The
long jump by the jumper depend upon its
a.mass b. angle
c.height d. all
of these
27-b The
angle between angular and linear velocity will be
a. 0o b.45o c.90o d.180o
28. According
to Einstein , the gravity interaction is possible between __________________
a. nuclear
radiation b. material object c electromagnet d) both b& c
29. The critical velocity of an satellite is _________________________
a) 6.9 b)7.9 c) 8.9 d) approximately 10
30. The
value of disc and hoop can ______________________.
a) same
when both have sane mass and radius b)same different mass and radius c) not be same if only mass
change d) not be same if only radius changes
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21.a 22. C 23. b 24. d 25.
a 26.c 27.-b.c
28. d 29.b 30.d
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31. The disc
and hoop ahave same radius and mass, their rotational K.E are related by an
equation is
a) K.E
hoop=(1/2)K.E disc b) K.E
hoop=K.E disc c. K.E hoop=2K.E disc d. K.E hoop=4K.E disc
32. The
moment of inertia of thin rod is
a)
(1/12 )M2L b) (1/12 )ML2 c) (1/12 )M/L d)(1/12 )ML
33. The
rotational K.E of the body is equal to ________________ .
a) its transnational K.E b) double than its transnational K.E c) half than its transnational KE
d) all of
these
34. The
ratio of the orbital velocity to the escape velocity is
35. The time period of satellite with
critical velocity is __________________.
a) 84minutes b) 100 minutes c) 24 hours d) 365 days
36. The
relation between the speed hope and disc
will be
37. The
linear velocity is of a disc moving down an inclined plane is_______________.
38. The orbital
velocity of a staelltite is directly proportional to ___________________
a) the radius of the
orbit ‘r’ b) The 1/r of the
orbit c) square root of the radius ‘r’
d) inverse square root
of the radius
39.The cloth dryer
machine working principle is based on ____________________.
a)
Contraction b) expansion c) thermostat d) centrifuge
40. The angle between centrifugal
and centripetal force is ___________________.
a) 0o b.45o c.90o d.180o
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31.C 32.b 33. a 34. c 35.
a 36.d 37.b 38. c
39.d 40.d
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41. Where
will be it be profitable to sell 1 kilogram sugar for a shop keeper?
a) At
equator b) at poles c) At 40o latitude d) At 90o lattitude
42. The spherical
shape of rain drops are mainly due to ____________________.
a) viscosity
b)
thrust on water c) surface
tention d) earth gravity
43. Bending
of motorcyclist on turn taking on curve
road is due to _________________.
a) reduction
of speed b) reduction in
friction c) generation of centripetal
force d) all of these.
44.The
weight of an object placed at north pole w.r.t south pole will be how much when
earth’s start rotating with higher speed?
a)
double b) half c) One and half of the actual weight d) No change
45. The
atmosphere around earth is due to ___________________________
a) the
sun b) cloud c) gravity d) the rotation of earth e) both c & d
46. If a
planet has time period of one day is 48 hours.What will be new time period for
its one day when its radius becomes
half?
a) 12
h b) 24 c) 36 d) no change
47. Escape velocity
of the air molecules from the surface of the earth is ______________________.
a) 40km/s b) 7.9km/s c)11.2km/s d)
none of these
48. The gravitational effect producing tides
in sea is due to_________________________.
a) sun b) moon c)both a& b d) earth gravity e) None of these
49.The
orbital velocity of the satellite mainly depends upon
a) the
orbital radius b) the radius of
earth c) the mass of earth d) the mass of satellite
50.
From the communication satellite, the
time taken by radio waves to reach earth station is ______________________.
a) 1s b) ½ s c) ¼ s d) 1/8 s d) None of these
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41.a 42.c 43. c 44. d 45.
e 46.b 47.c 48.b
49.a 50.b
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