11th Physics MCQs Preparation 2022 and Onwards (Unit: Rotational and Circular Motion: Set-1 (31 MCQs)) for National MDCAT, ECAT, FPSC, PPSC, JOB Exam, Physics Lecturer, SSC, HSSC (F.Sc.), BS, MS Exams NTS, ETS ETc..



1. 85.95° degree in terms of a radian is




... Answer is C. `\1 frac {1}{2}`radian
57.3° = 1 rad or 1° = 0.01745 rad


2. What is the circumference of a circle, having a radius of 50 cm?




... Answer is B. 3.14 m
Circumference of circle = 2ㄫr


3. What is the angular velocity of a particle when its frequency is 50 Hz?




... Answer is C. 314 rad s⁻¹
ധ = 2ㄫf


4. The direction of angular velocity is along;




... Answer is B. Axis of rotation
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5.  Angular speed for annual rotation of Earth in radians per day.




... Answer is C. 2ㄫ radian/day
ധ = `\frac {Δθ}{Δt}`= `\frac {2ㄫ rad}{day}` (as Earth completes one rotation in a day)


6. A body moves with constant angular velocity in a circle. The magnitude of angular acceleration is




... Answer is C. Zero
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7. Banking angle does not depend upon :




... Answer is A. Mass
tanθ = `\frac {v^2}{Rg}`


8. What will happen if the height of an orbit of a satellite from the surface of the earth is increased,




... Answer is B. Angular velocity increases
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9. What is the ratio of translational and rotational kinetic energies of a solid sphere.




... Answer is A. `\frac {1}{2}`
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10. Angular momentum in terms of the moment of inertia is




... Answer is A. Iധ
 L = Iധ


11. Which one of the following rolling bodies has 50% translational K.E and 50% rotational K.E.




... Answer is B. Ring
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12. A solid cylinder of mass 20 kg rotates about its axis with an angular velocity of 10 m s⁻¹, and a radius of 0.2m. The moment of inertia of the cylinder is




... Answer is D. 0.8 kg m²
I = mr²


13. The condition of weightlessness is (N=Normal Reaction and W is weight)

... Answer is D. N=0
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14.  A sphere is rolling without slipping on a horizontal plane. The ratio of its rotational kinetic energy and translational kinetic energy is




... Answer is B. 2:5
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15. The frequency of artificial gravity is




... Answer is C. `\frac {1}{2ㄫ}` `\sqrt frac {R}{g}`
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16.. A particle of mass 100 g starts its motion from rest along a circular path of radius 10 cm. If its velocity becomes 10 m s⁻¹ then its centripetal force is;




... Answer is D. 100 N
Fc = `\frac {mv^2}{r}`


17. Which one of the following is conserved when the torque acting on a system is zero? :




... Answer is B. Angular momentum
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18. Orbital velocity of earth's satellite near the surface is 7 km/s. If the radius of the orbit is 4 times that of Earth's radius, what will be the orbital velocity in that orbit?




... Answer is D. 14 km s⁻¹
v = `\sqrt {gR}`


19. When a parachutist is moving downward with uniform motion then its weight is:




... Answer is C. Remain same
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20. An object of mass 1.5 kg is suspended by a string having tension T = 5 N in a lift. When the lift is moving upward with an acceleration of 2 m s⁻¹ then its apparent weight is:




... Answer is C. 2 N
For downward motion F = T - W or W = T - ma {where F = ma}


21. The angular speed in radians/hours for the daily rotation of our earth is?




... Answer is D. 𝝿/12
Angular Speed equation ω = θ/t 👉 Since Earth takes t = 24 hours for to complete 1 revolution, angle θ = 2π rad 👉 ω=(2π rad)/(24 hour) = π/12 rad/hour


22. Linear acceleration a = r𝛂 when '𝞱' is 




... Answer is D. 90°
`\vec a` = `\vec r` x `\vec ∝` = r∝ sin𝞱 👉 when 𝞱 = 90° 👉 a = r∝ sin 90° 👉 sin 90° = 1 👉 a = r∝


23. What is a moment of inertia of a sphere




... Answer is C. `\frac {2}{5}`MR²
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24. 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 horizontal plane. It follows




... Answer is C. It moves in a circular path
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25. A body moving in a circular path with constant speed has




... Answer is A. Constant acceleration
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26. Astronauts appear weightless in space because




... Answer is C. satellite is freely falling
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27. Which one is constant for a satellite in orbit? 




... Answer is C. Angular Momentum
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28. If the earth suddenly stops rotating the value of 'g' at the equator would:




... Answer is C. Increase
Given: Equation for Value of g at equator g' = g - ѠR² 👉 when Ѡ = 0 (angular rotation stop) 👉 g' = g - 0 = g


29. If a solid sphere and solid cylinder of the same mass and density rotate about their own axis, the moment of inertia will be greater for




... Answer is B. Solid cylinder
Moment of inertia of sphere Is = 2/5 mr² 👉 Moment of inertia of cylinder Ic= = 1/2 mr² 👉 1/2 ＞ 2/5 👉 Ic ＞ Is


30. The gravitational force exerted on an astronaut on Earth's surface 600 N down. When she is in the International Space Station, the gravitational force on her is





... Answer is B. smaller,
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31. A solid cylinder of mass M and radius R rolls down an incline without slipping. Its moment of inertia is about an axis through its center of mass MR²/2. At any instant while in motion, its rotational kinetic energy about its center of mass is what fraction of its total kinetic energy?




... Answer is C. 1/3
👉 K.E (Rotational) = K.E (T)= 1/2 mѠ² 👉 K.E (Translational) K.E (T) = 1/2 mv² = 1/2 mr²Ѡ² = IѠ² 👉 K.E (Total) = K.E (R) + K.E (T) 👉 [K.E (R)]/[K.E (Total)] = [1/2 mѠ²] / [K.E (R) + K.E (T)] = [1/2 mѠ²] / [1/2 mѠ² + IѠ²] 👉 by solving we get [K.E (R)]/[K.E (Total)] = 1/3



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Or 

Select from the below Links for HSSC-I (Class-11) :  Physics MCQS Preparation


1. Unit:  Measurements: Set-1 (32 MCQs), Set-2 (50 MCQs), Set-3 (50 MCQs),                                   Set-4 (50 MCQs),   Set-5 (50 MCQs),  

2. Unit:  Vectors and Equilibrium: Set-1 (34 MCQs), 

3. Unit:  Force and Motion: Set-1 (34 MCQs), 

4. Unit:  Work and Energy: Set-1 (29 MCQs), 

5. Unit:  Rotational and Circular Motion: Set-1 (31 MCQs), 

6. Unit:  Fluid Mechanics or Dynamics: Set-1 (31 MCQs), 

7. Unit:  Oscillations : Set-1 (27 MCQs), 

8. Unit:  Waves : Set-1 (27 MCQs), 

9. Unit:  Physical Optics : Set-1 (27 MCQs), 

10. Unit:  Thermodynamics: Set-1 (34 MCQs),  

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