Chapter 7 Circular Motion _ Test 2

1. Centripetal force varies directly to the radius of circular path

1) False
2) True
2. Centripetal acceleration varies directly to the square of velocity

1) False
2) True
3. The formula for orbital velocity is Vorb= GM/R

1) True
2) False
4. Cream Separator is an application of circular motion

1) True
2) False
5. Three Geostationary Satellites when placed at 120o with each other will cover the whole world.

1) False
2) True
6. A 2 kg object is moving in a circle with a speed of 4 m/s. If the radius of the circle is 1m, what will be the value of the centripetal force acting on the object?

1) 32N
2) 8N
3) 16N
4) 64N
7. How many time centripetal forces will increase if the mass of a body moving with a uniform speed in a circle is doubled?

1) Two times
2) Six times
3) Four times
4) Eight times
8. The S:I unit of Gravitational constant is .

1) Nm2 kg-2
2) Nm2 g-2
3) Dynes m2 g-2
4) Ncm2 g-2
9. Value of acceleration due to gravity is.

1) 9.8 cm/s2
2) 9.8 km/hr
3) 9.8m/s2
4) 9.8. cm/hr
10. Velocity of an object moving with constant speed in circular path changes because:

1) Direction of motion changes
2) Speed changes
3) Force changes
4) Acceleration changes
11. We can feel the gravitational force between the objects if they have.

1) Large mass.
2) High velocity
3) Large distance between them
4) High volume
12. If radius of circle in which object is moving is doubled then centripetal acceleration becomes.

1) Three times
2) Double
3) Four times
4) Half
13. Value of g at a height 'h' from the surface of the earth i.e. gh is

1) gM/R2
2) GM/R2
3) GM/(R+h)2
4) gM/(R+h)
14. If the object is placed at a height equal to radius of earth from the surface of earth then value of g becomes .

1) one fourth
2) six times
3) Twice
4) Four times
15. A satellite is revolving around the earth in a circular orbit .If the radius of arbit is increased from R to 2R what will be its velocity?

1) v/2
2) v2
3) v/vÖ2
4) 2v
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