Physics - Force & Motion

Physics - Force & Motion

1. Rate of change of momentum of body is equal to:

a) Acceleration
b) Work done
c) Force
d) Velocity
2. The limiting friction also increases with the increase in:

a) Pressure
b) Acceleration
c) None of these
d) Normal force
3. Kinetic friction is usually less than static friction:

a) False
b) True
4. Law of conservation of momentum is true not only for bigger bodies but also for atoms and molecules:

a) False
b) True
5. The value of Coefficient of kinetic friction depends on the nature of surfaces and:

a) Uniform velocity
b) Variable velocity
c) Average velocity
d) Relative velocity
6. The weight is a scalar quantity:

a) False
b) True
7. Force applied on a body produces:

a) Acceleration
b) Momentum
c) Force
d) Friction
8. The maximum value of static friction is also known as:

a) All of these
b) Limiting friction
c) Kinetic friction
d) Rolling friction
9. The mass of a body is a measure of its inertia:

a) True
b) False
10. The quantity that can be measured by a spring balance:

a) Weight
b) Mass
c) Force
d) Tension
11. The change in momentum is in the direction of :

a) Velocity
b) magnitude
c) Applied Force
d) Speed
12. The direction of weight is towards the:

a) Pole of earth
b) None of these
c) Center of the Earth
d) All directions
13. The value of co-efficient of static friction depends on the nature of the surfaces sliding against each other and:

a) Force
b) Motion
c) Time
d) Normal Reaction
14. Mass is a scalar quantity:

a) False
b) True
15. A body with wheels faces less friction as compared to a body of:

a) Same size
b) All of the above
c) Large size
d) Small size
16. In equation v2= - m1/m2 x v1 the negative sign indicates that the gun moves in the direction opposite to that of the bullet

a) True
b) False
17. A glass of water placed on a table remains there unless a force is applied to remove it

a) False
b) True
18. Action and reaction reacts in:

a) Same direction
b) Opposite directions
c) In all directions
d) Vertical direction
19. Weight of a body remains same every where

a) False
b) True
20. Newton's first law of motion is also known as law of:

a) Volume
b) Inertia
c) Weight
d) Mass
21. The rolling friction is always:

a) Less than sliding friction
b) More than sliding friction
c) None of these
d) Equal to sliding friction
22. If an object is slides against one another surface then:

a) Acceleration produces
b) Speed of the object increases
c) Friction produces
d) Velocity increases
23. The value of k is usually less than that of s.

a) True
b) False
24. The greatest disadvantage of friction is that we can walk on the ground:

a) False
b) True
25. Newton established the relationship between force and:

a) Time
b) Motion
c) Speed
d) Velocity
26. A truck has a momentum of 30,000 Kg . m/s and moving with a velocity of 10 m / s, its mass will be:

a) 3000 Kg
b) 30000 gm
c) 300 Kg
d) 30000 Kg
27. If a wooden black of mass 1.5 kg is pushed along a smooth surface of a table with a force of 5 6N, the acceleration of the block is:

a) - 4ms-2
b) 4ms-2
c) 4ms2
d) - 4s-4
28. Total momentum of the two balls will not be the same as the total momentum before collision:

a) False
b) True
29. Inertia is that characteristic of a body due to which it resist any change in its state of rest or of:

a) Force
b) Uniform motion
c) Acceleration
d) Weight
30. Mass is measured by an ordinary balance:

a) True
b) False
31. Tension in the string acts downward:

a) False
b) True
32. If no external force acts the body retains its state of rest or of:

a) Rotatory Motion
b) Uniform Motion
c) Translatory motion
d) Vibratory Motion
33. In rolling friction the surface of a body moves by sliding against the surface of another body:

a) True
b) False
34. Rocket or Jet engine works on the Principle of :

a) Uniform velocity
b) Momentum
c) None of these
d) Motion
35. When a bullet is fired from a gun the bullet moves in the forward direction while the gun recoil in the backward direction. The forward motion of the bullet is reaction:

a) False
b) True
36. When a body slides over the surface of another body then an opposite force resists the motion of the body which is called as:

a) Linear Momentum
b) Torque
c) Friction
d) Momentum
37. Rate of change in momentum is equal to:

a) M ( Vf - Vi ) / t
b) V ( Vf - Vi ) / t
c) m Vi .m Vf  t
d) Vf - Vi / t
38. The magnitude of force is directly proportional to the:

a) Weight
b) Velocity
c) Mass
d) Acceleration
39. A lead shot of mass 5 gm is fired with an air gun. If the velocity of the shot is 60 m/s, its momentum will be:

a) 30 Kg . m / s
b) 0.3 kg . m / s
c) 3 Kg . m / s
d) None of these
40. According to Newton's first law of motion a body continues its motion with:

a) Relative velocity
b) Velocity velvety
c) Average velocity
d) Uniform velocity
41. Momentum is a vector quantity:

a) True
b) False
42. The product of mass and velocity is called as:

a) Force
b) Acceleration
c) Momentum
d) Velocity
43. For a moving object greater is the mass the greater will be the quantity of motion and greater is the velocity:

a) False
b) True
44. The value of gravitational acceleration g does not remain:

a) Same
b) Un-equal
c) Changed
d) Modified
45. When two bodies connected by a string move vertically then the value of acceleration a of the bodes will be:

a) m1g / (m1+m2)
b) m1m2 g / (m1+m2)
c) 2m1m2 g / (m1+m2)
d) (m1-m2) g / (m1+m2)
46. If the applied force F on the block is increased gradually by adding more weights, friction also:

a) Finishes
b) Remains the same
c) Increases
d) Decreases
47. fs(max) remains inversely proportional to fn.

a) False
b) True
48. A bullet of mass 10 gm is fired with a velocity of 60 m/s the momentum of the bullet will be:

a) 600 Kg . m/s
b) 0.6 Kg. m/s
c) 60 Kg. m/s
d) None of these
49. A body of mass 10 Kg is moving with a velocity of 10 m / s . a constant force acts upon it for 4 seconds and reduces its velocity to 2 m / s the momentum after the application of force will be:

a) None of these
b) 20 Kg . m/s
c) 100 kg. m/s
d) 1000 Kg . m/s
50. Forces Fn and W act in opposite directions but their values are always:

a) Less
b) Greater
c) Equal
d) Varies
51. A moving body on wheels having friction which is known as:

a) Rolling friction
b) None of these
c) Double friction
d) Static friction
52. Weight and mass are same quantities:

a) False
b) True
53. The friction between the two surfaces depends upon the normal force therefore the area of contact between the two surfaces affect its value.

a) True
b) False
54. Friction can be:

a) Reduced
b) None of these
c) Eliminated
d) Totally eliminated
55. The unit of coefficient of friction is:

a) Newton
b) Kilogram
c) Meter
d) No Unit
56. If the force acting on a body is doubled , then the acceleration produces is:

a) Four times
b) Doubled
c) Thrice
d) Remains same
57. Motion can not be produced in a body with out the application of:

a) Mass
b) Velocity
c) Acceleration
d) Force
58. The quantity of matter in a body is called:

a) Weight
b) Force
c) Mass
d) Torque
59. Is this statement is true that mass is the measure of inertia:

a) False
b) True
c) Both are applicable some times
d) None of these
60. The mass of an object is 20 kg if it starts from rest and attains a velocity of 20 m/s in 2 sec then the force acting on it will be:

a) 300 N
b) 2240 N
c) 105 N
d) 200 N
 
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