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CHAPTER 6

WORK AND ENERGY

Encircle the most appropriate answer from the following options


1.         Product of force and distance covered in the direction of force is:

(a) Acceleration         

(b) Resistance

(c) Work        

(d) Specific heat


2.         For work   conditions should be fulfilled:

(a) 1

(b) 2

(c) 3

(d) 4


3.         Work is   quantity:

(a) Scalar       

(b) Vector

(c) Base         

(d) None of above


4.         Unit of work is:

(a) N

(b) Nm

(c) J

(d) Both b & c          


                                      

5.         Work done will be   if no force act on the body:

(a) Maximum 

(b) Minimum

(c) Zero          

(d) All of above


6.         if displacement is   to force then the Work done will be maximum

(a) Parallel     

(b) Perpendicular       

(c) Tangent    

(d) Normal


7.         Work done will be zero if displacement is   to force:             

(a) Parallel      

(b) Perpendicular

(c) Tangent    

(d) Normal


8.           if a force of one Newton acts on the body and it covers the distance of 1 meter in the direction of force then the Work done will be one ___

(a) Watt          

(b) Joule

(c) Newton     

(d) Coulomb


9.         One Mega joule is equal to:   

(a) 106 J         

(b) 103 J

(c) 109 J         

(d) 102 J


10.       What will be the magnitude of work if a force of 25 N pulls a stone through a distance of 5 m in its direction:

(a) 25 J           

(b) 50 J

(c) 75 J           

(d) 125 J


11.       Which unit is equal to kgm2s 2 in the units given below:

(a) Joule        

(b) Newton

(c) Watt          

(d) Meter


12.       Rate of doing work with respect to time is known as:           

(a) Energy      

(b) Power

(c) Momentum           

(d) None of above


13.       Unit of power is:

(a) Watt          

(b) Joule

(c) Newton     

(d) Coulomb


14.       How much power is used by a 40 kg athlete by climbing 10m high ladder in 10 s:

(a) 4 W

(b) 40 W

(c) 400 W

(d) 4000 W


15.       What will be the power of a machine doing 10 J work in 5 seconds?

(a) 2 W

(b) 10 W

(c) 25 W         

(d) 50 W


16.       Ability of a body to do work is known as:      

(a) Force        

(b) Momentum

(c) Power       

(d) Energy


17.       There are   basic kinds of energy:

(a) 1

(b) 2

(c) 3

(d) 4


18.       Energy is ——— quantity:

(a) Vector       

(b) Scalar

(c) Base         

(d) None of above


19.       Unit of Energy in System International is:

(a) Watt          

(b) Joule

(c) Newton     

(d) Coulomb


20.       Energy possessed by a body due to its motion is called   energy:

(a) Kinetic     

(b) Potential

(c) Mechanical

(d) All of above


21.       A bowler during playing cricket throws a ball of mass 200 g with a velocity of 20 ms1 .Its kinetic energy will be:

(a) 4 J

(b) 40 J

(c) 400 J         

(d) 4000 J


22.       If the velocity of a body is doubled then What will be the kinetic energy of a body?

(a) Doubled    

(b) Four times

(c) Eight times

(d) Half


23.       What will be the kinetic energy of a body if its mass is doubled?

(a) Doubled   

(b) Four times

(c) Eight times

(d) Half


24.       What will be the kinetic of a car of mass 1000 kg moving with a velocity of 20 ms-1 ?

(a) 2 x 102 J   

(b) 2 x 107 J

(c) 2 x 105 J   

(d) 2 x 107 J


25.       Ability of a body to do work due to its position is called —– —- energy:

(a) Kinetic       

(b) Potential

(c) Mechanical

(d) All of above


26.       Ability of a body to do work due to its height from the surface of earth is called  energy:

(a) Gravitational Potential   

(b) Elastic Potential

(c) Chemical Potential

(d) Attraction


27.       When a ball is lifted to a height ‘h’ from the ground, it will posses ——energy:

(a) Kinetic

(b) Gravitational potential

(c) Elastic potential

(d) Mechanical


28.       Total energy of the system:

(a) Increases  

(b) Decreases

(c) Remains same    

(d) All of above


29.       For movement of our body   energy is used:

(a) Heat          

(b) Electrical

(c) Chemical  

(d) Mechanical


30.       1 hp =

(a) 726 W       

(b) 736 W

(c) 746 W       

(d) 756 W


31.       For the propagation of signals in our body   energy is used:

(a) Heat          

(b) Electrical

(c) Chemical  

(d) Mechanical


32.        Which energy is used For maintaining the body temperature  :

(a) Heat          

(b) Electrical

(c) Chemical  

(d) Mechanical


33.       Increase in K.E is equal to:

(a) Increase in P.E     

(b) Decrease in P.E

(c) No effect  

(d) Both a & b


34.       Increase in P.E is equal to:

(a) Increase in K.E     

(b) Decrease in K.E

(c) No effect  

(d) Both a & b


35.       Decrease in K.E is equal to:

(a) Increase in P.E    

(b) Decrease in P.E

(c) No effect  

(d) Both a & b


36.       Decrease in P.E is equal to:

(a) Increase in K.E   

(b) Decrease in K.E

(c) No effect  

(d) Both a & b


37.       What will be the power of the motor if a motor lifts a weight of 5N up to the height of 2m in 4s.?

(a) 2.5 W

(b) 5 W

(c) 20 W         

(d) 10 W


38.       Energy of the water stored in the dam is:

(a) Elastic potential energy

(b) Gravitational potential energy

(c) Kinetic energy

(d) Mechanical energy


39.       How many types of mechanical energy are there?

(a) 1

(b) 2

(c) 3

(d) 4