Circular motion MCQs
Multiple choice questions
1.)The relation between arc of length of the circle and radian is
a)s= r/θ.
b) s = rθ
c) s= r²θ.
d) s = √r /θ
Ans : b) s= rθ
2.) 1 revolution in terms of radian is
a)π rad. b) 2π rad
c) π/2 rad. d) 3π/2 rad
Ans : b) 2π rad
3.) 1 radian in terms of degree is
a)55.3°. b) 56.2°
c) 57.3°. d) 58.8°
Ans : c) 57.3°
4.) The SI unit of angular velocity is
a) Metre / radian
b) Radian / second
c) Radian second
d) Radian / second ²
Ans : b) radian / second
5.) The unit of angular velocity can be written as
a) Revolution / second
b) Revolution / radian
c) Revolution / minute
d) Minute / radian
Ans : c) Revolution / minute
6.) The average angular velocity can be defined as, ωav = _________
a)∆θ/t. b) ∆v/t
c) ∆θ/∆t. d) θ/∆t
Ans : c) ∆θ/∆t
7.) The average angular acceleration can be defined as, αav = ______
a)∆ω/∆θ. b) ∆ω/∆t
c) ∆θ/∆t. d) ∆θ/∆ω
Ans : b) ∆ω/∆t
8.) The unit of angular acceleration is
a)rad.s-2 b) rad-1.s-2
c)rad.s-2 d) rad.s
Ans : c) rad.s-2
9.) The force needed to bend the normally straight path of the particle into circular path is called,
a) Gravitational force
b) Centripetal force
c) Tangential force
d) Centrifugal force
Ans : b) Centripetal force
10.) The instantaneous acceleration of an object traveling with uniform speed in a circular is directed towards the centre of the circle and is called
a) Centripetal acceleration
b) Centripetal velocity
c) Centripetal displacement
d) Centripetal force
Ans : a) Centripetal acceleration
11.) Centripetal can be expressed as , Fc = ________
a)mv²/r. b) m²v/r
c) mv/r². d) m²v²/r
Ans : a) mv²/r
12.) The relation between centripetal force and centripetal acceleration is
a)Fc = mac. b) Fc = m/ac
c) Fc = ma²c d) Fc = m²/ac
Ans : a) Fc = mac
13.) The moment of inertia can be defined as, I = _______
a)rm². b) mr²
c) r/m². d) m/r²
Ans : b) mr²
14.) The SI unit of angular momentum can be written as,
a)kgm-2s-1 b) kgm-1s-1
c) kgm2s-1 d) kgm-2s-2
Ans : c) kgm2s-1
15.) Fill in the blank.
The axis of rotation of an object will not change its orientation unless an external _________ causes it to do so,
a) force. b) torque
c) velocity. d) field
Ans : b) torque
16). Orbital velocity can be written as, v = _________
a)√(GM/r). b)√(GM)/r
c) √G×(M/r). d) GM/√r
Ans : √(GM/r)
17.) The rate of change of angular velocity is called,
a) Angular displacement
b) Angular acceleration
c) Angular force
d) Motion of torque
Ans : b) Angular acceleration
18.) The rotation analogue of mass in linear motion is called,
a) Angular velocity. b) Moment of inertia
c) torque. d) Centripetal force
Ans : b) Moment of inertia
19.) The analogue of linear momentum and is defined as the product of moment of inertia and angular velocity, is called
a) Angular velocity. b) Moment of inertia
c) Angular momentum. d) Centripetal force
Ans : c) Angular momentum
20). Fill in the blank.
In the absence of an external torque, total angular momentum of all bodies in a system remains _______
a)zero. b) Infinite
c) constant. d) equal
Ans : c) constant
21). Artificial satellites are the object that orbit around the Earth due to ______
a)law of motion. b) gravity
c) velocity. d) torque
Ans : b) gravity
22.) The tangential velocity to put a satellite in orbit around the Earth, is called
a) Orbital b) Angular velocity
c) Motion of torque. d) Angular momentum
Ans : a) Orbital velocity
23.) An gravity like effect produced in an orbiting spaceship to overcome weightlessness by spinning the spaceship about its own axis, is called
a) Acceleration due to gravity
b) Artificial gravity
c) Motion of a gravity
d) Gravitational force
Ans : b) Artificial gravity
24.) An satellite whose orbital motion is synchronised with the rotation of the Earth, is called,
a) Moment of satellite
b) Geo- stationary satellite
c) Gravity of satellite
d) Stationary orbital satellite
Ans : b) Geo-stationary satellite
25.) The relation between frequency an artificial gravity is, f = ( 1/2π )(_____)
a)g/√R. b) √(g/R)
c) √g/R. d) 2√(g/R)
Ans : b) √(g/R)
26.) Complete the formula of orbital radiaus of Geostationary orbits, r = [ GMT²/4π²]__
a) 2. b) ½
c) ⅓. d) ¼
Ans : c) ⅓
27.) The artificial satellites launched by men is adopt nearly circular course around the Earth, this type of motion is called
a) Orbital motion
b) Gravitational motion
c) Artificial gravity
d) Orbital velocity
Ans : a) Orbital motion
28.) No force is required to hold an object falling in the frame of reference of the space craft or satellite, sach system is called,
a) Velocity free system
b) Orbital free system
c) Motion free system
d) Gravity free system
Ans : d) Gravity free system