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Class 11 Physics Objective Chapter – 4 Motion in a Plane
1. Which among the following is a scalar quantity
( a ) Force
( b ) Mass
( c ) Momentum
( d ) Velocity
Ans:- (b)
2. The path followed by a projectile is called its?
( a ) Territory
( b ) Treasury
( c ) Tractor
( d ) Trajectory
Ans:- (d)
3. A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle. The motion takes place in a plane. It follows that
( a ) its acceleration is constant
( b ) its motion is circular
( c ) its velocity is constant
( d ) its motion is linear
Ans:- (b)
4. The total flight requires a time that is?
( a ) four times the time necessary to reach the maximum height.
( b ) thrice the time necessary to reach the maximum height
( c ) equal to the time necessary to reach the maximum height.
( d ) twice the time necessary to reach the maximum height
Ans:- (d)
5. A stone is tied to one end of a string. Holding the other end, the string is whirled in a horizontal plane with progressively increasing speed. It breaks at some speed because
( a ) Gravitational forces of the earth are greater than the tension in the string.
( b ) The required centripetal force is greater than the tension sustained by the string.
( c ) The required centripetal force is less than the tension in the string.
( d ) The centripetal force is greater than the weight of the stone.
Ans:- (b)
6. Vectors lying in the same or parallel to the same plane are called ————–
( a ) Coplanar vectors
( b ) Equal vector
( c ) Unit Vector
( d ) Displacement vector
Ans:- (a)
7. A body makes a displacement of 4 m due East from a point O and then makes displacement of 3 m due North. Its resultant displacement from O
( a ) 7 m
( b ) 1 m
( c ) 5 m
( d ) 1 . 2 m
Ans:- (c)
8. A body is moving along a circular path with variable speed, it has
( a ) A radical acceleration
( b ) A tangential acceleration
( c ) Zero acceleration
( d ) Both radical and tangential acceleration
Ans:- (d)
9. Circular motion is a ———–
( a ) Motion in one dimension
( b ) Motion in two dimensions
( c ) Motion in three dimensions
( d ) Motion in four dimensions
Ans:- (b)
10. A body of mass 500 gram is rotating in a vertical circle of radius 1 m. What is the difference in its kinetic energies at the top and the bottom of the circle?
( a ) 4.9 J
( b ) 19.8 J
( c ) 2.8 J
( d ) 9.8 J
Ans:- (d)
11. For a particle performing a U.C.M. the acceleration is
( a ) constant in direction
( b ) constant in magnitude but not in the direction
( c ) constant in magnitude and direction
( d ) constant in neither magnitude nor in direction
Ans:- (b)
12. The angle between centripetal acceleration and tangential acceleration is?
( a ) 180°
( b ) 0°
( c ) 90°
( d ) 45°
Ans:- (c)
13. Which theorem states that “If a particle under the simultaneous action of three forces is in equilibrium, then each force has a constant ratio with the sine of the angle between the other two forces”?
( a ) Lay’s theorem
( b ) Lami’s Theorem
( c ) Newton’s law
( d ) Faraday’s theorem
Ans:- (b)
14. He dimensional formula for normal acceleration is
( a ) LT-1
( b ) L2T2
( c ) L3T-2
( d ) LT-2
Ans:- (a)
15. Which is the vector that gives the position of a point with reference to a point other than the origin of the coordinate system?
( a ) Coplanar Vectors
( b ) Equal vector
( c ) Unit Vector
( d ) Displacement vector
Ans:- (d)
16. A body is traveling in a circle at constant speed. It
( a ) has an inward acceleration
( b ) has constant velocity.
( c ) has no acceleration
( d ) has an outward radial acceleration
Ans:- (a)
17. A book is pushed with an initial horizontal velocity of 5.0 meters per second off the top of a desk. What is the initial 1 vertical velocity of the book?
( a ) 10. m/s
( b ) 0 m/s
( c ) 50 m/s
( d ) 2.5 m/s
Ans:- (b)
18. One radian is defined to be the angle subtended where the arc length S is exactly equal to the?
( a ) radius of the circle.
( b ) diameter of the circle.
( c ) circumference of the circle.
( d ) half of radius of the circle.
Ans:- (a)
19. Motion in a plane is called ———–
( a ) Motion in one dimension
( b ) Motion in two dimensions
( c ) Motion in three dimensions
( d ) Motion in four dimensions
Ans:- (b)
20. A body travels along the circumference of a circle of radius 2 m with a linear velocity of 6 m/s. Then its angular velocity is
( a ) 6 rad /s
( b ) 3 rad /s
( c ) 2 rad / s
( d ) 4 rad / s
Ans:- (b)
21. A car sometimes overturns while taking a turn. When it overturns, it is
( a ) The inner wheel which leaves the ground first
( b ) The outer wheel which leaves the ground first
( c ) both the wheel leave the ground simultaneously
( d ) Either inner wheel or the outer wheel leaves the ground
Ans:- (a)
22. One° (1°) is equal to?
( a ) 0.1745 rad
( b ) 0.01745 rad
( c ) 0.001745 rad
( d ) 7.1745 rad
Ans:- (b)
23. Dot product is distributive, it is given as
( a ) A.(B-C) = A.B*A.C
( b ) A.(B+C) = A.B-A.C
( c ) A.(B+C) = A.B+A.C
( d ) A.(B*C) = A.B/A.C
Ans:- (c)
24. One radian is equal to?
( a ) 57.7°
( b ) 53.7°
( c ) 59.3°
( d ) 57.3°
Ans:- (d)
25. Acceleration due to gravity
( a ) polar vector
( b ) a scalar
( c ) a vector
( d ) None of these
Ans:- (a)
26. A small body attached at the end of an inextensible string completes a vertical circle, then its
( a ) angular momentum remains constant
( b ) linear momentum remains constant
( c ) angular velocity remains constant
( d ) total mechanical energy remains constant
Ans:- (d)
27. A body goes round the circumference of a circle of radius 2 m with an angular velocity of 2 rad/s. Its centripetal acceleration is
( a ) 3 m/s²
( b ) 1 . 5 m/s²
( c ) 6 m/s²
( d ) 12 m/s²
Ans:- (b)
28. When particle revolves with uniform speed on a circular path
( a ) no force acts on it
( b ) no acceleration acts on it
( c ) no work is done by it
( d ) its velocity is constant
Ans:- (c)
29. A body travels along the circumference of a circle of radius 2 m with a linear velocity of 4 m/s. Its centripetal acceleration is
( a ) 8 m/s²
( b ) 16 m/s²
( c ) 10 m/s²
( d ) 4 m/s²
Ans:- (a)
30. The angular velocity depends upon the rate of change of the?
( a ) Angular acceleration
( b ) Angular Distance.
( c ) Angular Displacement.
( d ) torque
Ans :- (c)
31. A cyclist goes round a circular path of circumference 343 m in s. The angle made by him, with the vertical is
( a ) 440
( b ) 420
( c ) 430
( d ) 450
Ans:- (d)
32. When a body P moves on a circular path, the centripetal acceleration is
( a ) directed inwards from P, to the centre of the circle
( b ) directed tangential to the circumference of the circle, at P
( c ) directed perpendicular to the plane of the circle, at P
( d ) directed outward, perpendicular to the circumference of the circle
Ans:- (a)
33. How many minimum number of vectors in different planes can be added to give zero resultant?
( a ) 4
( b ) 5
( c ) 3
( d ) 2
Ans:- (a)
34. In a vertical circle of radius r at what point in its path, a particle has a tension equal to zero?
( a ) Highest point
( b ) Lowest point
( c ) Any point
( d ) A horizontal point
Ans:- (a)
35. A body is traveling in a circle at a constant speed. It
( a ) has a constant velocity
( b ) has no acceleration
( c ) has an inward acceleration
( d ) has an outward radial acceleration
Ans:- (c)
36. A book is pushed with an initial horizontal velocity of 5.0 meters per second off the top of a desk. What is the initial vertical velocity of the book?
( a ) 10. m/s
( b ) 0 m/s
( c ) 50 m/s
( d ) 2.5 m/s
Ans:- (b)
37. Which of the following conditions are sufficient and essential for a quantity to be a vector?
( a ) Magnitude, direction, and addition, subtraction multiplication and division by vector laws
( b ) Magnitude, direction and combination of vectors by ordinary rules of algebra
( c ) Magnitude and addition, subtraction, multiplication by ordinary rules of algebra
( d ) Magnitude and direction
Ans:- (a)
38. A particle is performing a U.C.M. Which is the wrong statement regarding its motion?
( a ) The velocity vector is tangential to the circle
( b ) The acceleration vector is tangential to the circle
( c ) The acceleration vector is directed towards the center of the circle
( d ) The velocity and acceleration vectors are perpendicular to each othe
Ans:- (b)
39. A particle has a displacement of 2 units along the x – axis, 1 unit along the y – axis and 2 units along the z – axis. Then the resultant displacement of the particle is
( a ) 3 units
( b ) 5 units
( c ) 4 units
( d ) 1 units
Ans:- (a)
40. A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle? The motion takes place in a plane. It follows that
( a ) its velocity is constant
( b ) its acceleration is constant
( c ) its motion is linear
( d ) its motion is circular
Ans:- (d)
41. A car is moving on a circular path and takes a turn. If R1 and R² are the reactions on the inner and outer wheels respectively, then
( a ) R1 = >R²
( b ) R1 = R²
( c ) R1 < R²
( d ) R1 > R²
Ans:- (c)
42. An airplane is taking a turn in a horizontal plane
( a ) its remains horizontal
( b ) it inclines inward
( c ) it inclines outward
( d ) its wings become vertical
Ans:- (b)
43. The tangential component and centripetal component of acceleration are?
( a ) Similar to each other
( b ) Parallel to each other.
( c ) Equal to each other.
( d ) Perpendicular to each other.
Ans:- (d)
44. When angular velocity changes with respect to time then?
( a ) an angular acceleration is produced
( b ) a linear acceleration is produced
( c ) it constitute a couple
( d ) a linear velocity is produced
Ans:- (a)
45. A can filled with water is revolved in a vertical circle of radius 4 metre and the water does not fall down. The time period of revolution will be
( a ) 4 sec
( b ) 10 sec
( c ) 8 sec
( d ) 1 sec
Ans:- (a)
46. Which is a constant for a freely falling object?
( a ) displacement
( b ) velocity
( c ) acceleration
( d ) speed
Ans:- (c)
47. Give an example of motion in two dimensions ———–
( a ) Motion along a straight line in any direction
( b ) Bird flying
( c ) A flying kite
( d ) Projectile motion
Ans:- (d)
48. Energy dissipated usually appears as
( a ) P.E.
( b ) Heat Energy
( c ) Chemical energy
( d ) Nuclear Energy
Ans:-(b)
49. The SI unit of work is
( a ) Newton
( b ) Joule
( c ) Mol
( d ) Calorie
Ans:-(b)
50. The value of solar constant.
( a ) 1.4 kW m-2
( b ) kW m-2
( c ) 1.6 kW m-2
( d ) 2 kw m-2
Ans:-(a)
51. The commercial unit of electric energy is
( a ) Kilo watt hour
( b ) watt
( c ) Watt hour
( d ) Kilo Watt
Ans:-(a)
52. The SI unit of power is
( a ) Joule
( b ) Newton
( c ) Watt
( d ) Kilowatt
Ans:-(c)