Get the 1st Year Physics Chapter 5 Circular Motion MCQs with Answers here online. In this chapter, the Circular or Angular motion of a body is described. The motions are in the form of Angular Displacement, Angular Velocity, Angular Acceleration. What is the relation b/w Angular and Linear Velocities is also described. The force needed to move a body in a circular path is the Centripetal Force. Moment of Inertia, Angular Momentum, Artificial Satellite, Real and Apparent Weight, and Orbital Velocity also works on the principle of Circular motion. It also includes Artificial Gravity, Geostationary Orbits, and Communication Satellite. Newton and Einstein gave different views about Gravitation. So, this is the information about this chapter. Get the important MCQs below.

## 1st Year Physics Chapter 5 Circular Motion MCQs with Answers

### KEY POINTS

- Angular Displacement, Velocity, and Acceleration
- Relation b/w Angular and Linear Velocities
- Centripetal Force
- Moment of Inertia
- Angular Momentum
- Rotational Kinetic Energy
- Artificial Satellite
- Real and Apparent Weight
- Orbital Velocity
- Artificial Gravity
- Geostationary Orbits
- Communication Satellite
- Newton’s and Einstein’s views of Gravitation

**Question#1. The rotational K.E of the hoop is?**

- Equal to its translational K.E
- Half than its translational K.E
- Double than its translational K.E
- Four times than its translational K.E

### Answer

### Answer

**Equal to its translational K.E**

**Question#2. A hoop and disc have the same mass and radius. Their rotational K.E is related by an equation?**

- K.E
_{hoop}= K.E_{disc} - K.E
_{hoop}= 2K.E_{disc} - K.E
_{hoop}= 1/2K.E_{disc} - K.E
_{hoop}= 4K.E_{disc}

### Answer

### Answer

**K.E**

_{hoop}= 2K.E_{disc}**Question#3. The angular velocity of a minute hand of a clock is?**

- 2 π/60 rads
^{-1} - π/24 rads
^{-1} - 2 π/3600 rads
^{-1} - π/3600 rads
^{-1}

### Answer

### Answer

**2**

**π/3600 rads**

^{-1}**Question#4. The angular K.E of a body is independent of?**

- Speed
- Moment of inertia
- Angular momentum
- None of these

### Answer

### Answer

**None of these**

**Question#5. A body suddenly comes and sits on the circular rotating table. What will remain conserved?**

- Angular momentum
- Linear velocity
- Kinetic energy
- None of these

### Answer

### Answer

**Angular momentum**

**Question#6. According to Einstein, the gravitational interaction is possible between?**

- Material objects only
- Material objects and electromagnetic radiation only
- Electromagnetic radiations
- None of the above

### Answer

### Answer

**Material objects and electromagnetic radiation only**

**Question#7. The number of revolutions in 3π radians?**

- 2
- 3/2
- 6
- 1/60

### Answer

### Answer

**3/**2

**Question#8. The period of circular motion is given by:**

- T = rV
- T = ωw
- T = 2πω
- T = 2π/ω

### Answer

### Answer

**T = 2π/ω**

**Question#9. The direction of linear velocity of a body moving in a circle is?**

- Along the axis of rotation
- Along the tangent
- Directed towards the center
- Directed away from the center

### Answer

### Answer

**Along the tangent**

**Question#10. When a body moves in a circle, the angle between its linear velocity and angular velocity is always?**

- 180°
- 0°
- 90°
- 45°

### Answer

### Answer

**90°**

**Question#11. An arc of length equal to the circumference of a circle subtends an angle?**

- π radian
- 2π radian
- π/2 radian
- 4π radian

### Answer

### Answer

**2π radian**

**Question#12. The relation between linear and angular acceleration is:**

- α = axrv
- a = rxα
- a = α x r
- r = αxa

### Answer

### Answer

**a = α x r**

**Question#13. When a body is whirled in a horizontal circle by means of a string the centripetal force is supplied by?**

- Mass of body
- Velocity of body
- Tension in the string
- Centripetal acceleration

### Answer

### Answer

**Tension in the string**

**Question#14. What remains constant when the earth revolves around the sun?**

- Linear momentum
- Linear K.E
- Angular K.E
- Angular momentum

### Answer

### Answer

**Angular momentum**

**Question#15. The angular momentum of a body is conserved if?**

- Force acting on its constant
- Force acting on it is zero
- The torque acting on it is zero
- All of these

### Answer

### Answer

**The torque acting on it is zero**

**Question#16. A stone is whirled in a vertical circle at the end of the string. When the stone is at the highest position the tension in the string is?**

- Maximum
- Zero
- Equal to the weight of the stone
- Less than the weight of the stone

### Answer

### Answer

**Equal to the weight of the stone**

**Question#17. The “clutch” of a car works by using which type of collision?**

- Torsional collision
- Rotational collision
- Scattering of piston
- None of these

### Answer

### Answer

**Rotational collision**

**Question#18. In the case of planets, the necessary acceleration is provided?**

- Gravitational force
- Frictional force
- Coulomb force
- Centripetal force

### Answer

### Answer

**Gravitational force**

**Question#19. If a car moves with a uniform speed of 2ms ^{-1} in a circle of radius 0.4. Its angular speed is?**

- 4 rad. S
^{-1} - 5 rad. S
^{-1} - 1.6 rad. S
^{-1} - 2.8 rad. S
^{-1}

### Answer

### Answer

**5 rad. S**

^{-1}**Question#20. A body can have constant velocity when it follows an:**

- Elliptical path
- Circular path
- Parabolic path
- Rectilinear path

### Answer

### Answer

**Rectilinear path**

**Question#21. A body moving along the circumference of a circle, completes two revolutions. If the radius of the circular path is R, the total angular displacement covered is?**

- πR
- 2Πr
- Zero
- 4π

### Answer

### Answer

**4π**

**Question#22. The angular speed for the daily rotation of Earth in rad s ^{-1} is?**

- 2π
- π
- 4π
- 7.3 x 10
^{-5}rads^{-1}

### Answer

### Answer

**7.3 x 10**

^{-5}rads^{-1}**Question#23. Time taken by geostationary satellite to complete one rotation around Earth is?**

- 1 year
- 1 day
- 1 hour
- 84 min

### Answer

### Answer

**1 day**

**Question#24. The direction of angular momentum is along?**

- Tangent to the circle
- Inward the radius
- Axis of rotation
- Outward of the radius

### Answer

### Answer

**Axis of rotation**

**Question#25. If a wheel of radius r turns through an angle of 30°, then the distance through which any point on its rim moves is?**

- π/3 r
- π/6 r
- π/30 r
- π/180 r

### Answer

### Answer

**π/6 r**

**Question#26. In angular motion, Newton’s second law of motion is:**

- F = ma
- F = ∆p/∆t
- t = 1α

- All of the above

### Answer

### Answer

**t = 1α**

**Question#27. The angular speed of the second’s hand of a watch in rads ^{-1} is?**

- π
- π/2
- π/30
- π/180

### Answer

### Answer

**π/30**

**Question#28. The shaft of a motor rotates at a constant angular speed of 360rev/min. Angle turned through in 1 sec in radian is?**

- π
- 3π
- 6π
- 12π

### Answer

### Answer

**12π**

**Question#29. What is an outward force acting on a mass of 10kg when rotating at one end of an inelastic string 10m long at speed of 1m/s?**

- 1N

- 10N
- 2N
- 100N

### Answer

### Answer

**1N**

**Question#30. If we whirl a stone at the end of a string in the vertical circle, it is likely to break when the stone is?**

- At the highest point
- At the lowest point
- At any point during motion
- At the point where gravity is not acting

### Answer

### Answer

**At the lowest point**

**Question#31. The global positioning system consists of how many satellites?**

- 24 Natural satellites
- 24 artificial satellites
- 3 synchronous satellites
- Both b and c

### Answer

### Answer

**24 artificial satellites**

**Question#32. A man of weight W is standing on an elevator which is ascending with an acceleration a. The apparent weight of the man is?**

- mg
- mg – ma
- mg + ma

- ma – mg

### Answer

### Answer

**mg + ma**

**Question#33. Who discovered the inverse square law of gravity?**

- Einstein
- Galileo
- Newton
- Plank

### Answer

### Answer

**Newton**

**Question#34. Bruce Mc. Candles stepped into space from a space shuttle in 1984 at a speed of?**

- 2900 km h
^{-1} - 29000 km h
^{-1} - 29000 ms
^{-1} - 2900 ms
^{-1}

### Answer

### Answer

**29000 kmh**

^{-1}**Question#35. A satellite moving round the earth constitutes?
**

- An inertial frame of reference
- Non-inertial frame
- Neither inertial nor non-inertial
- Both inertial and non-inertial

### Answer

### Answer

**Non inertial frame**

**Question#36. A body of mass 10kg is rotating in a circular path of radius ‘r’ m with constant speed. The work done in one complete revolution is?**

- 10.3 rads
^{-1} - Zero
- 100 rads
^{-1} - 0.5 rads
^{-1}

### Answer

### Answer

**Zero**

**Question#37. A body of 2kg is suspended from the ceiling of an elevator moving up with an acceleration g. Its apparent weight in the elevator will be?**

- 9.8N
- 19.6N
- 129.4N
- 39.2N

### Answer

### Answer

**39.2N**

**Question#38. Moment of inertia of which body about its perpendicular axis is greater, (all have the same mass and radius)?**

- Sphere
- Hoop

- Disc
- All have the same movement of inertia

### Answer

### Answer

**Hoop**

**Question#39. If θ _{E} is the angle of bending of light predicted by Einstein’s theory of gravity and θ_{N} that by Newton’s then?**

- θ
_{E}= θ_{N} - θ
_{E}= 1/2 θ_{N} - θ
_{E}= 2θ_{N} - No relation exists between θ
_{E}and θ_{N}

### Answer

### Answer

**θ**

_{E}= 2θ_{N}**Question#40. In the solar eclipse of 1919 A.D., bending of straight light was measured to be?**

- 1.745 degree
- 1.745 minute
- 1.745 seconds
- 1.745 radian

### Answer

### Answer

**1.745 seconds**