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Uniform Circular Motion Class 9 MCQ Questions With Answers
1.
Earth revolves around the sun, centripetal force required is provided by:
Frictional force
Gravitational force
Coulomb’s force
Magnetic force
2.
The radius of earth in meters is:
6.38×106
6.38×1024
6.0×106
6.0×1024
3.
The angular displacement is measured in:
Degrees
Radian
Both Degrees and Radians
None of these
4.
If the radius of a body moving in a circle with a uniform speed is doubled, its centripetal acceleration becomes:
Twice
Three times
Four times
half
5.
If a stone is tied to the end of a string and whirled in a circle, the tension in a string provides:
Centripetal force
Centrifugal force
Pressure
Reaction
6.
For an object moving in a straight line with decrease in velocity, the angle between velocity and acceleration is:
0o
45o
90o
180o
7.
For an object moving in circular path, the angle between velocity and acceleration is:
0o
45o
90o
180o
8.
The value of “G” was determined experimentally by:
Newton
Coulomb
Cavendish
Faraday
9.
Centripetal acceleration is due to:
Change in direction of velocity
Change in magnitude of velocity
Change in both magnitude and direction of velocity
Change in the path of velocity
10.
The centripetal force is always directed:
Along the direction of motion
Away from center
Towards the center
In a straight line
11.
If the uniform speed of a body moving in a circle with a uniform speed is doubled, its centripetal acceleration becomes:
Twice
Three times
Four times
half
12.
The direction of velocity in a uniform circular motion is-
towards the centre
straight line
cannot be determined
along the tangent to the point on the circle
13.
Velocity in uniform circular motion is
Constant
Variable
Sometimes variable and sometimes constant
Can't be determined
14.
If mass of a body moving in a circle with a uniform speed is doubled, its centripetal force becomes:
Twice
Three times
Four times
half
15.
1 radian =
0.573o
5.73o
57.3o
573.00
16.
Which of the following is a tangent to the point on the circle?
A
A & B
A, B & D
C
17.
Uniform circular motion is a uniform motion
True
False
Don't know
18.
For an object moving in a straight line with increase in velocity, the angle between velocity and acceleration is:
0o
45o
90o
180o
19.
Uniform circular motion is an accelerated motion
True
False
Don't Know
20.
The mass of earth in kilograms is:
6.38×106
6.38×1024
6.0×106
6.0×1024
21.
In a uniform circular motion
velocity is constant
acceleration is constant
speed is constant
All of the above
22.
The value of “G” is:
6.67×10 -6 Nm2/kg2
6.67×10 -9 Nm2/kg2
6.67×10 -10 Nm2/kg2
6.67×10 -11 Nm2/kg2
23.
The gravitational force between two bodies depends upon the product of their masses in addition to:
Square of the distance between them
Shape of bodies
Medium between them
Sum of masses
24.
The centripetal acceleration is always directed:
Along the direction of motion
Away from center
Towards the center
In a straight line
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