Chapter 4 - Motion in Two Dimensions
1. The motion of a body along a straight line is called __________.
(Linear Motion, Angular Motion, Vibratory Motion)
2. The motion of a body along a curved path is called __________.
(Linear Motion, Angular Motion, Vibratory Motion)
3. The example of motion of the body in two dimensions is __________.
(Ball moving along a straight line, Progectile, Train moving along a straight track)
4. In projectile motion the object is purely under the influence of __________.
(Centripetal Force, Force of Gravity, Restoring Force)
5. In projectile motion (freely falling bodies) sign assigned to the acceleration due to gravity (g) will always be __________.
(Positive, Negative, None of these)
6. In considering the projectile motion all the vectors like, velocity and displacement along positive y-axis will be taken as __________.
(Positive, Negative, None of these)
7. During the projectile motion, the vertical component of a velocity __________.
(Changes, remains the same, None of these)
8. During the projectile motion, the horizontal component of the velocity __________.
(Increases, Remains the same, Decreases)
9. The path of the projectile is __________.
(Parabolic, Hyperbolic, Elliptical)
10. During the projectile motion the acceleration along the horizontal direction will __________.
(Decrease, Increase, be Zero)
11. In projectile the acceleration along vertical direction will __________.
(Decrease, Increase, Remain the same)
12. The expression for the time to reach the maximum height of the projectile is __________.
(Vosinq/g, 2Vosinq/g, Vosinq/2g)
13. The expression for the total time of flight of the projectile is __________.
(Vosinq/g, 2Vosinq/g, Vosinq/2g)
14. The expression for maximum height reached by the projectile is __________.
(Vo2sin2q/g, Vosin2q/2g, Vo2sin2q/2g)
15. The expression for the horizontal range of the projectile is __________.
(Vo2sin2q/g, Vosin2q/g, Vo2sin2q/2g
16. The expression for the maximum range of the projectile is __________.
(Vo2/g, Vosin2q/2g, Vosinq/2g)
17. For the maximum range of the projectile the angle of elevation must be __________.
(0°, 45°, 90°)
18. The horizontal range of the projectile is directly proportional to the __________.
(Initial Velocity, Square of the initial velocity, Square root of the initial velocity)
19. The horizontal range of the projectile is directly proportional to the __________.
(sine of the angle of elevation, sine of the twice of the angle of elevation, square of the sine of the angle of elevation)
20. The expression for the trajectory of the projectile is __________.
(ax – ½ bx2, a/x – bx2/2, ax – bx2)
21. In projectile motion the small angle of elevation produces __________.
(Flat Trajectory, High Trajectory, Low trajectory)
22. In projectile motion the large angle of elevation produces __________.
(Flat trajectory, Low Trajectory, High trajectory)
23. If the angle of elevation of the projectile is 90° then its horizontal range will be __________.
(Minimum, Zero, Maximum)
24. For the projectile with high trajectory their time of flight will be __________.
(Short, Long, None of these)
25. For the projectile with low trajectory, their time of flight will be __________.
(Short, Long, None of these)
26. If a projectile has some horizontal range at an angle of elevation of 15° then its range will be the same when the angle of elevation is equal to __________.
(30°, 45°, 75°)
27. At maximum height, the vertical component of the velocity of the projectile is __________.
(Minimum, Zero, Maximum)
28. Horizontal motion with constant velocity and vertical motion with constant acceleration is called __________.
(Rectilinear Motion, Projectile Motion, Circular Motion)
29. A ball is thrown horizontally from a height of 400m with a muzzle velocity of 100m/s. It experiences a horizontal acceleration equal to __________.
(50m/s2, 9.8 m/s2, zero)
30. If a shell is fired with the velocity of 9.8 m/s at an angle of 45° then its horizontal range will be __________.
(Zero, 4.9m, 9.8m)
31. A projectile is fired horizontally with an initial velocity of 20m/s. after 3 seconds its horizontal component of velocity is __________.
(60m/s, 6.67,20 m/s)
32. In projectile motion __________ of the following angle will result the maximum range.
(20°, 45°, 60°)
33. An aeroplane moving horizontally with a velocity of 100m/s, drops a food packet while flying at a height of 490m. The packet will strike the ground from the point just vertically below the point of the projection at a distance of __________.
(980m, 1000, 1960 m)
34. The ball A is dropped from the top of a building simultaneously the ball B is thrown horizontally then __________.
(ball A strikes the ground first, ball B strikes the ground first, both ball A and B will strike the ground simultaneously)
35. If the launch angle of a locust is 55° and its range is 0.8 m then the take off speed of a locust is __________.
(2 m/s, 2.9 m/s, 3.9 m/s)
36. __________ should be the initial velocity of a rocket if it to hit a target 1000 km away.
(3130.5 m/s, 313.5 m/s, 31.35 m/s)
37. If an object is moving with constant speed along a circle then its motion is __________.
(Linear, Vibratory, Uniform Circular)
38. The expression for the time period of an object moving with constant speed v along a circle of radius r is given by __________.
(4pr/v, 2pr/v, pr2/v)
39. The angle subtended by an object with the centre of the circle when its is moving from one point to another on its circumference is called __________.
(Angular Displacement, Angular Speed, Angular Acceleration)
40. The unit of angular displacement in system of measurement is __________.
(Radian, m/s, rad/s)
41. The central angle subtended by an arc whose length is equal to the radius of the circle is equal to one __________.
(Radian, Degree, Gradient)
42. The relation linear (s) and angular (q) displacements is given by __________.
(s = rq, s = r/q, q = sr)
43. In the relation s = rq, q will always be measured in __________.
(Degrees, Radian, None of these)
44. One radian is equal to __________.
(5.73 degrees, 57.3 degrees, 53.7 degree)
45. One degree is equal to __________.
(0.017 rad, 17.45 rad, 1.74 rad)
46. The angular displacement or shift per unit time is called __________.
(Angular Speed, Angular Velocity, Angular Acceleration)
47. One revolution is equal to __________.
(2p rad, p/2 rad, 4p rad)
48. 1 radial is equal to __________.
(2prevolution, p/2 rad, p1/2 revolution)
49. The direction of angular velocity is always along the axis of rotation and it can be determined by __________.
(Head to tail rule, Right hand rule, None of these)
50. If an object is rotating in the counter-clockwise direction then the direction then the direction of angular velocity is __________.
(Into the plane, Out of the plane, None of these)
51. If a particle with instantaneous linear velocity ‘v’ is rotating along the circumference of circle of radius ‘r’ then the relation between angular velocity (w) and its linear velocity (v) is given by __________.
(v = w/r, v = rw, w = vr)
52. If a particle covers equal angular displacement in equal interval of time then its angular velocity is __________.
(Variable, Uniform, Average)
53. The rate of change of angular velocity is called __________.
(Angular Displacement, Angular Acceleration, None of these)
54. The unit of angular acceleration in SI system is __________.
(deg/s2, m/s2, rad/s2)
55. The relation between linear acceleration (a) and angular acceleration (a) of a particle is given by __________.
(a = ra, a = a/r, a = ar)
56. The velocity of the particle tangent to its circular path is called __________.
(Angular Velocity, Uniform Angular Velocity, Tangential Velocity)
57. In circular motion the time period and angular velocity of a particle are __________.
(Directly proportional to each other, Inversely proportional to each, none of these)
58. If a particle is moving with constant speed along the circumference of a circle then the acceleration possessed by the particle is __________.
(Linear Acceleration, Centripetal Acceleration, None of these)
59. The direction of centripetal acceleration will always be __________.
(Towards the centre of the circle, Aways from the centre of the circle)
60. The force, which produces the centripetal acceleration, is called __________.
(Centrifugal Force, Gravitational Force, Centripetal Force)
61. The expression for centripetal acceleration is given as __________.
(v/r, v2/r, r2w)
62. The expression for centripetal acceleration in terms of time period (T) is given as __________.
(4pr2/T, 4pr/T, 4p2r/T2)
63. The force, which keeps the body in circular motion and always directed towards the centre of the circle is called __________.
(Force of Gravity, Centripetal Force, Centrifugal Force)
64. The acceleration of the body or particle tangent to the circular path is called __________.
(Centripetal Acceleration, Tangential Acceleration, None of these)
65. In circular motion the tangential component of acceleration arises when __________.
(speed of the object is changed, speed of object is constant, direction of motion of the object is changed)
66. In circular motion the centripetal component of acceleration arises when __________.
(speed of the object is changed, speed of the object is constant, direction of motion of object is changed)
67. Centripetal acceleration and tangential acceleration are always __________.
(Parallel to Each other, Perpendicular to each other, None of thse)
68. A car is travelling at a constant speed of 20m/s rounds a curve of radius 100m. What is its acceleration.
(2m/s2, 3m/s2, 4m/s2)
69. If the speed of the object moving in a circle is doubled then centripetal force __________.
(Remains the same, Becomes half of its initial value, Becomes from times than its initial value)
70. When an object moves round the circular track, the centripetal force is provided by __________.
(Force of Gravity, Fictious Force, Frictional Force)
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