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CHAPTER 3

DYNAMICS

Encircle the most appropriate answer from the following options

1.        Laws of motion was presented by:

(a) Einstein

(b) Newton

(c) Galileo

(d) Archimedes


2.     Isaac Newton described the laws of motion in his  which famous book:

(a) Qanoon-ul-Masoodi

(b) Principia Mathematica

(c) Kitab-ul-Astralab

(d) Al-Manazir


3.       laws of motion established a relationship between motion and–

(a) Force

(b) Torque

(c) Acceleration

(d) Momentum


4.       The First Law of motion is also called as law of–

(a) Torque

(b) Acceleration

(c) Inertia

None of these


5.        The direct measure of inertia of  body is:

(a) Mass

(b) Energy

(c) Momentum

(d) All of above


6.       The characteristic of a body by which it tends to retain its state of rest or of uniform motion is called as

(a) Weight

(b) Force

(c) Inertia

(d) Momentum


7.      Which is the agency which changes or tends to change the state of rest or of

uniform motion of a body:

(a) Weight

(b) Force

(c) Inertia

(d) Momentum


8.         Law of inertia is actually the __ law of motion:

(a) First

(b) Second

(c) Third

(d) Fourth


9.         When a force is applied on the body, _ is produced in the body:

(a) Weight

(b) Acceleration

(c) Energy

(d) None of these


10.       The acceleration produced in a moving body is always in which direction of applied —

(a) velocity

(b) Force

(c) speed

(d) momentum


11.       When mass of the body is doubled while keeping the force constant, then what will be acceleration

(a) One half

(c) One fourth

(b) doubled

(d) Four times


12.    If force applied on the body is doubled while keeping the mass constant, then acceleration will be:

(a) One half

(b) One fourth

(c) doubled

(d) Four times


13.      SI unit of force is

(a) kilograms

(b) Dynes

(c) newton

(d) pounds


14.       When a force of 8 newton is applied on a body of mass 2 kg, then the acceleration

(a) 16 ms-2

(b) 4 ms-2

(c) 0.4 ms-2

(d) 160 ms-2


15.      1 N =

(a) Kgms-2

(b) Kgms-1

(c) Kgm2s -1

(d) Kg2ms 2


16.      Action and reaction are equal in magnitude but opposite in direction is known as

(a) First

(b) Second

(c) third

(d) Fourth


17.       Walking on road is an example of   law of motion:

(a) First

(b) Second

(c) third

(d) Fourth


18.      If a block is lying on a smooth surface, it’s weight is balanced by:

(a) Mass

(b) Momentum

(c) Inertia

(d) Normal Reaction


19.      What will be the weight of a body of mass 10 kg on earth :

(a) 10N

(b) 1N

(c) 100N

(d) 1000N


20.        The ————- of a body always acting towards the center of the earth:

(a) Force

(d) Weight

(b) Force

(d) Weight


21.         Quantity of matter in a body known as :

(a) Force

(d) Weight

(b) Force

(d) Weight


22.        The Force with which earth attracts a body towards its centre is known as:

(a) Mass

(b) Force

(c) Weight

(d) Inertia


23.       The characteristic of a body which determines the magnitude of acceleration produced when a certain force acts upon it:

(a) Mass

(b) Force

(c) Inertia

(d) weight


24.      Mass of the body is measured by:

(a) Free Fall Apparatus          

(b) Physical balance

(c) Spring balance

(d) All of above


25.       Weight of the body is measured by:

(a) Free Fall Apparatus   

(b) Physical balance

(c) Spring balance

(d) All of above


26.        Unit of weight will be

(a) kg

(b) ms-1

(c) Nm

(d) N


27.      __ of a body remains same everywhere:

(a) weight

(b) Acceleration

(c) velocity

(d) Mass


28.      __of a body does not remain same everywhere:

(a) weight

(b) Inertia

(c) Mass

(d) All of above


29.      The value of weight of a body of constant mass depends on:

(a) Inertia        

(b) Momentum

(c) Force

(d) ‘g’


30.       Mass is a   quantity:

(a) Scalar       

(b) Vector

(c) Derived     

(d) Negative


31.       Weight is a        quantity:

(a) Scalar       

(b) Vector

(c) Unitless     

(d) Negative


32.       If a block is hanging with the help of a rope then weight of the body is balanced by:

(a) Acceleration         

(b) Inertia

(c) Displacement       

(d) Tension


33.       There are   cases of motion of the body hanging with the help of rope:

(a) 1

(b) 2

(c) 3

(d) 4


34.       The tension produced when one body moves vertically and the other moves horizontally is   as compared to the tension produced when both bodies move vertically:

(a) Half           

(b) One fourth

(c) Double      

(d) Four times


35.       Quantity of motion in a body is called as:

(a) Mass         

(b) Momentum

(c) Velocity     

(d) Acceleration


36.       Product of mass and velocity is known as:

(a) Force        

(b) Speed

(c) Momentum          

(d) Acceleration


37.       SI unit of Momentum is:        

(a) Kgms2

(b) Ns

(c) Kgms1

(d) Both b & c


38.       Kgms

(a) N

(b) J

(c) Ns

(d) W


 39.        The Rate of change of momentum is equal to:

(a) Force        

(b) Velocity

(c) Acceleration        

(d) Impulse


40.       Direction of the rate of change of momentum will be  in the direction of:

(a) Acceleration         

(b) Momentum

(c) Velocity     

(d) Force


41.       The force which resists the motion of one surface on another surface is known as:

(a) Gravity      

(b) Friction

(c) Weight      

(d) Repulsion


42.       If the object is at rest, the force of friction is called as __  friction:

(a) Static        

(b) Limiting

(c) Kinetic       

(d) Dynamics


43.       The maximum value of static friction is known as ————- friction:

(a) Static        

(b) Limiting

(c) Kinetic       

(d) Dynamics


44.       When an object is in motion then the force of friction is known as —–friction:

(a) Static        

(b) Limiting

(c) Kinetic     

(d) Dynamics


45. Static friction is   than kinetic friction:

(a) Less          

(b) Quartered

(c) Greater    

(d) Equal


46.       Rolling friction is _  than Sliding friction:

(a) Less

(b) Quartered

(c) Greater

(d) Equal


47.         The coefficient of friction has ————– unit:

(a) Newton

(b) Dynes

(c) No

(d) Kilogram


48.          Friction of liquid __ than friction of solids:.

(a) less

(b) Quartered

(c) Greater

(d) Equal


49.        The Coefficient of friction does not depend upon the _ between two surfaces:

(a) Area of contact

(b) Normal Reaction

(c) weight

(d) Roughness


50.          The rolling friction is about  times smaller than sliding friction:

(a) 10

(b) 50

(c) 100

(d) 1000


51.       Friction in the human joints is much reduced due to the presence of:

(a) Bones       

(b) Muscles

(c) Fluid         

(d) Gas


52.       Value of coefficient of friction (11k) depends upon:

(a) Nature of the surfaces   

(b) Area of contact

(c) Force        

(d) All of above


53.       The Rotation of water sprinkler is an example of law of motion:

(a) First           

(b) Second

(c) Third        

(d) Fourth


54.       A spider web remains intact due to:

(a) Weight      

(b) Momentum

(c) Tension   

(d) None of these


55.       Momentum of a moving body depends upon its:

(a) Mass         

(b) Velocity

(c) Weight      

(d) Both a & b


56.       Motion of the rocket is an example of:

(a) First law of motion

(b) Law of conservation of Momentum

(c) Law of conservation of Energy    

(d) Weight


57.       Value of coefficient of static friction (Its) is typically __  than coefficient of kl friction (Pk):

(a) Less          

(b) Quartered

(c) Greater    

(d) Equal


58.       When air is released from an inflated balloon, it shoots off is an example of:

(a) First law of motion

(b) Law of conservation of Energy

(c) Weight      

(d) Law of conservation of Momentum


59.       Sliding friction is normally converted into Rolling friction by the use of:

(a) Ball bearing         

(b) Oil

(c) Grease      

(d) Polish


60.       The front sides of high speed vehicles, aeroplanes and ships are shaped wedge like to reduce:

(a) Weight      

(b) Pressure

(c) Speed       

(d) Friction