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__Chapter 4__

__Work and Energy__

**Encircle th most appropriate answer among the following options**

*1. Work is the product of choose which one is correct:*

(a) Force and distance

**(b) Force and displacement**

(c) Force and velocity

(d) Force and energy

*2. Work is the product of choose which one is correct: *

**(a) Two vectors **

(b) Two scalars

(c) Vector and scalar

(d) None of these

*3. The product of force and displacement represents choose which one is correct: *

(a) Torque

(b) Momentum

**(c) Work **

(d) Energy

*4. Work done will be maximum when angle between F and d is choose which one is correct:*

(a) 180^{0}

(b) 90^{0}

(c) 60^{0}

**(d) 0 ^{0}**

*5. The work done will be negative when force and displacement are choose which one is correct:*

**(a) In opposite direction **

(b) Same direction

(c) Perpendicular

(d) None of these

*6. The work done will be zero when angle between F and d is choose which one is correct:*

(a) 180^{0}

**(b) 90 ^{0}**

(c) 60^{0}

(d) 0^{0}

*7. The area under force displacement curve gives choose which one is correct:*

(a) Energy

**(b) Work**

(c) Momentum

(d) Torque

*8. The dimensions of work are choose which one is correct:*

(a) [MLT^{-2}]

(b) [ML^{2}T]

**(c) [ML ^{2}T^{-2}] **

(d) [MLT]

*9. The SI units of work is choose which one is correct:*

(a) Newton

(b) N x m^{2}

**(c) Joule **

(d) Kelvin

*10. The unit of work is similar to that of choose which one is correct:*

**(a) Energy **

(b) Power

(c) Force

(d) Weight

*11. The space where gravitational force acts is called choose which one is correct:*

(a) Electric field

**(b) Gravitational field**

(c) Gravity

(d) Conservative field

*12. The work done is independent of choose which one is correct:*

**(a) Path followed by the body **

(b) Force

(c) Direction

(d) None of these

*13. The total work done in a closed path in gravitational field is choose which one is correct:*

(a) Maximum

**(b) Zero **

(c) Constant

(d) None of these

*14. Work is defined as of force and displacement choose which one is correct: *

(a) Vector product

**(b) Scalar product**

(c) Both (a) and (b)

(d) None Of these

** 15. A field in which work done is independent of the path followed is called choose which **one is correct:

(a) Electric field

(b) Gravitational field

(c) Magnetic field

**(d) Conservative field**

*16. When a body is moved through a certain displacement d by a force F then work done is choose which one is correct:*

**(a) F . d**

(b) F x d

(c) F d

(d) None of these

*17. If a force F makes an angle *~~0~~* with the displacement d along the direction of motion, the work done is choose which one is correct:*

(a) Fd tan~~0~~

**(b) Fd cos 0**

(c) Fd sin~~0~~

*18. Work is a choose which one is correct: *

**(a) Scalar quantity **

(b) Vector quantity

(c) Both (a) and (b)

(d) None of these

*19. Which of the following force can do no work on the body when it acts choose which one is correct:*

(a) Elastic force

**(b) Centripetal force**

(c) Frictional force

(d) Gravitational force

*20. If a body of weight w is lifted through a height h then work done will be choose which one is correct:*

(a) wh

(b) Zero

(c) wh sin~~0~~

**(d) — wh**

*21. If a body of mass 5 kg raised vertically through a height of 1 m then indicate work done will be choose which one is correct:*

**(a) 49.0J **

(b) 4.9 J

(c) 490 J

(d) None of these

*22. A force acting at right angle to the displacement perform choose which one is correct:*

(a) Negative work

**(b) No work**

(c) Positive work

(d) Maximum work

*23. The component of the force in the direction of the displacement d is choose which one is correct:*

(a) Fd cos~~0~~

(b) Fd sin~~0~~

**(c) F cos 0 **

(d) Zero

*24. The rate of doing work is called choose which one is correct:*

(a) Work

(b) Force

(c) Momentum

**(d) Power**

*25. Power is the scalar product of choose which one is correct:*

**(a) Force and velocity **

(b) Force and distance

(c) Force and momentum

(d) Force and energy

*26. The S.I unit of power is choose which one is correct:*

(a) Joule

(b) Joule-sec

**(c) Watt **

(d) Newton-m

*27. One horse power is equal to choose which one is correct:*

**(a) 746 watt **

(b) 745 watt

(c) 750 watt

(d) 775 watt

*28. In British engineering system, the unit of power is choose which one is correct:*

(a) Joule

(b) Watt

**(c) Horse power **

(d) Kilowatt horse

*29. One Giga watt (Gw) is equal to choose which one is correct:*

(a) 10^{3 }watt

**(b) 10 ^{9} watt**

(c) 10^{12} watt

(d) 10^{18} watt

*30 I kWh is equal to choose which one is correct:*

**(a) 3.6 x 10 ^{5} J**

(b) 36 x 10^{5} J

(c) 36 x 10^{6} J

(d) 3.5 x 10^{6} J

*31. Dimensions of power are choose which one is correct: *

(a) [MLT^{-3}]

(b) [M^{2}LT^{2}]

(c) [ML^{-2}T]

**(d) [ML ^{2}T^{3}]**

*32. Commercial unit of electrical energy is choose which one is correct: *

(a) Erg-sec

(b) J/s

**(c) kWh **

(d) J-s

*33. Work is always on a body when choose which one is correct: *

(a) It moves through a certain distance

(b) It experiences a force while in motion

**(c) A force is exerted on it **

(d) None of these

*34. The power needed to lift a mass of 5 kg to a height of I m in 2 sec is choose which one is correct:*

**(a) 24.5 watt **

(b) 2.45 watt

(c) 0.245 watt

(d) 245 watt

*35. The average and instantaneous powers become equal if work is done at choose which one is correct:*

**(a) Constant rate **

(b) Variable rate

(c) Any rate

(d) None of these

*36. The power is one kilo-watt if work is done at the rate of choose which one is correct:*

(a) 500 J/s

**(b) 1000 J/s**

(c) 1000 J/min

(d) 1500J/s

*37. What is The relation between horse power and watt is choose which one is correct:*

(a) 1 hp = 546 watts

(b) 1 hp= 846 watts

(c) 1 hp = 1000 watts

**(d) 1 hp= 746 watts**

*38. If an agent consumes a power of I kilo-watt in one hour, the work done is choose which one is correct:*

(a) One watt

(b) One kilo-watt

**(c) One kilo-watt hour **

(d) None of these

*39. The capacity to do work is called choose which one is correct: *

(a) Work

**(b) Energy**

(c) Power

(d) Velocity

*40. The energy possessed by the body due to its motion is choose which one is correct:*

**(a) Kinetic energy **

(b) Potential energy

(c) Chemical energy

(d) None of these

*41. The energy possessed by the body due to its position is choose which one is correct:*

(a) Kinetic energy

**(b) Potential energy**

(c) Chemical energy

(d) None of these

*42. The expression for kinetic energy is choose which one is correct:*

**(a) K.E = mv ^{2}**

(b) K.E = m^{2}v

(c) K.E = mv^{2}

(d) K.E = mv

*43. The expression for potential energy is choose which one is correct:*

(a) P.E = mgh^{2}

(b) P.E = mgh

**(c) P.E = mgh**

(d) P.E = m^{2}gh

*44. The unit of potential energy is same as that choose which one is correct: *

**(a) Work **

(b) Force

(c) Momentum

(d) Power

*45. Work done is equal to choose which one is correct: *

**(a) Change in K.E **

(b) Change in momentum

(c) Change in force

(d) None of these

*46. The SI unit of energy is choose which one is correct: *

(a) Watt

(b) Newton

**(c) Joule **

(d) J-s

*47 Energy stored in the spring of a watch is choose which one is correct:*

(a) Kinetic energy

**(b) Elastic potential energy**

(c) Chemical energy

(d) Magnetic energy

*48. What is the kinetic energy of 50 kg mass moving with a speed of 5 m/s is choose which one is correct:*

**(a) 625 J **

(b) 526 J

(c) 652 J

(d) 256 J

*49. When the speed of the moving body is doubled then its choose which one is correct:*

**(a) Kinetic energy is doubled **

(b) Potential energy is doubled

(c) Both (a) and (b)

(d) None of these

*50. A body of mass 5 kg moving with a velocity of 2 m/s then its K.E is choose which one is correct:*

(a) 20J

(b) 5J

**(c) I0J **

(d) 15J

*51. What is The potential energy of an object on the surface of earth choose which one is correct:*

(a) mv^{2}

(b) mgh

(c) 2mg

**(d) zero**

*52. The work done on a body from earth surface to infinity appears as choose which one is correct:*

(a) Elastic potential energy

**(b) Absolute P.E**

(c) Zero P.E

(d) Maximum P.E

*53. The absolute P.E on the surface of earth is choose which one is correct:*

(a) Zero

**(b)**

(c) Maximum

(d) mgh

*54. Kinetic and potential energies are choose which one is correct:*

**(a) Two forms of energies **

(b) Two forms of torque

(c) Not related with each other

(d) None of these

*55. The velocity of a body with which it goes out of the earth’s gravitational field is called choose which one is correct:*

(a) Average velocity

**(b) Escape velocity**

(c) Instantaneous velocity

(d) Maximum velocity

*56. The expression for escape velocity is choose which one is correct:*

(a)

(b)

(c) 2

**(d)**

*57. The value of escape velocity is choose which one is correct:*

(a) 1.1 km/s

**(b) 11 km/s**

(c) 11 km/h

(d) 1.1 km/h

*58. When a body falls, its velocity increases due to action of choose which one is correct:*

**(a) Gravity **

(b) Force of friction

(c) Momentum

(d) Rotation

*59. The loss of potential energy is equal to gain of kinetic energy, is true only if there is no choose which one is correct:*

(a) Net force

**(b) Friction**

(c) Weight

(d) Gravity

*60. According to conservation of energy, the total amount of energy remains choose which one is correct:*

(a) Change

**(b) Constant**

(c) Increases

(d) Decreases

*61. The absolute potential energy is measured from the choose which one is correct:*

**(a) Centre of earth**

(b) Surface of earth

(c) Near to earth

(d) Infinity

*62. Formula of work-energy principle is of the form choose which one is correct:*

**(a) Work = mv _{f}^{2 }-mv_{1}^{2} **

(b) Work = mv_{f}^{2 }+mv_{1}^{2}

(c) Work = mv_{f}^{2 } mv_{1}^{2}

(d) None of these

*63. Gravitational potential energy by convention is choose which one is correct:*

(a) Positive

**(b) Negative**

(c) Both (a) and (b)

(d) None of these

*64. The formula for escape velocity of a planet Ves = gives only approximate value since choose which one is correct:*

(a) Value of g is not constant

(b) Mass of planet may also affect the escape velocity

(c) Radius of the planet

**(d) All of these**

*65. The value of g at the earths centre is choose which one is correct:*

(a) Minimum

(b) Maximum

**(c) Zero **

(d) None of these

*66. Energy possessed by a body due to its special configuration is called choose which one is correct:*

(a) Electrostatic energy

(b) Gravitational P .E

**(c) Elastic P.E **

(d) None of these

*67. P.E of any form increases only when we get choose which one is correct: *

**(a) Against the force**

(b) In the direction of force

(c) Perpendicular to the force

(d) None of these

*68. Gravitational interaction between the earth and the moon serves as source of choose which one is correct:*

**(a) Tidal energy **

(b) Mechanical energy

(c) Thermal energy

(d) Gravitational energy

*69. The energy of waves can be used to generate choose which one is correct: *

(a) Magnetic effect

**(b) Electricity**

(c) Solar energy

(d) Geothermal energy

*70. The solar cells are also known as choose which one is correct: *

(a) Dry cell

(b) Chemical cell

**(c) Photovoltaic cell **

(d) wet cell

*71. What will be the work done in kilo joules in lifting a man of 10 kg through a vertical height of 10 m choose which one is correct:*

(a) 9.8kJ

(b) 980 kJ

**(c) 0.98 kJ **

(d) 98 kJ

*72. Solar cells are made up from the material called choose which one is correct: *

(a) Steel

(b) Carbon

(c) Iron

**(d) Silicon**

*73. A solar cell is a device which converts solar energy into choose which one is correct:*

(a) Mechanical energy

(b) Heat energy

(c) Chemical energy

**(d) Electrical energy**

*74. The relation which takes place in nuclear reactor is a choose which one is correct:*

**(a) Fission reaction **

(b) Chemical reaction

(c) Fusion reaction

(d) None of these

*75. The tidal energy is due to the gravitational pull of choose which one is correct:*

(a) Sun

(b) Planet

(c) Mars

**(d) Moon**

*76. Absolute potential energy of the body at the earths surface is equal to choose which one is correct:*

(a) U_{m }=

**(b) U _{m }=**

(c) U_{m }=

(d) None of these

*77. The source of geothermal energy is choose which one is correct: *

(a) The fusion in sun

**(b) The radioactive decay in the earths interior**

(c) The rotation of earth around sun

(d) None of these

*78. 25000 watts power is equal to choose which one is correct: *

(a) 2.6 kilowatt

(b) 25 h-p

(c) 50 h-p

**(d) 35.5 hp**

*79. Which one among the following is the biggest unit of energy choose which one is correct: *

(a) Erg

(b) Joule

**(c) Kilowatt hour **

(d) Watt hour

*80. The power of a machine is one kilowatt when work is done by it at the rate choose which one is correct:*

(a) 1000 J/min

(b) 500 J/s

(c) 500 J/min

**(d) 1000 J/s**

*81. If a body of mass 5 kg is raised vertically through a distance of I m then the work done is choose which one is correct:*

**(a) 49.0 J **

(b) 4.9 J

(c) 0.49 J

(d) 490 J

*82. Geyser derives its energy from the choose which one is correct: *

(a) Jupiter

(b) Sun

(c) Snow

**(d) Earth**

*83. Geysers usually occurs in choose which one is correct: *

(a) Hot regions

(b) Cold regions

**(c) Volcanic regions**

(d) None of these

*84. The energy stored in a dam is choose which one is correct: *

(a) Kinetic energy

**(b) Potential energy**

(c) Chemical energy

(d) Electrical energy

*85. Ethanol is the replacement of choose which one is correct:*

(a) Kerosene oil

(b) Gas oil

**(c) Gasoline oil **

(d) Refinery oil

*86. The process of getting energy by direct combustion method from the waste products is commonly known as choose which one is correct:*

(a) Liquid waste

**(b) Solid waste**

(c) Gaseous waste

(d) All of these

*87. Biomass is a potential source of choose which one is correct: *

(a) Non-renewable energy source

**(b) Renewable energy source**

(c) Both (a) and (b)

(d) None of these

*88. Earth receives huge amount of energy directly from choose which one is correct:*

(a) Moon

(b) Wind

(c) Water

**(d) Sun**

*89. Tidal energy and wind energy is used to generate choose which one is correct:*

(a) Electric field

(b) Magnetic field

(c) Friction

**(d) Electricity**

*90. The methods used to convert biomass into fuels are choose which one is correct:*

(a) Direct combustion

(b) Fermentation

**(c) Both (a) and (b) **

(d) None of these

*91. Which of the following is non-renewable source of energy choose which one is correct:*

(a) Wind

(b) Biomass

**(c) Coal **

(d) None of these

*92. Which of the following is renewable source of energy choose which one is correct:*

**(a) Sunlight **

(b) Natural gas

(c) Oil

(d) None of these

*93. One dyne is equal to choose which one is correct: *

(a) 10^{3} N

**(b) 10 ^{5} N**

(c) 10^{-5} N

(d) 10^{-3} N

*94. A body of mass 5 kg, initially at rest, is moved by a force of 2 N on smooth horizontal surface. What will be the work done by the force in 10 s is choose which one is correct:*

(a) 20 J

(b) 30 J

**(c) 40 J **

(d) 60 J

*95. The kinetic energy of a body of mass m is E. Its momentum will be choose which one is correct:*

**(a)**

(b) 2mE

(c)

(d)

*96. The time taken by an engine of power 10 kw to lift a mass of 200 kg to a height of40 m is choose which one is correct:*

(a) 2 sec.

(b) 4 sec.

**(c) 8 sec. **

(d) 16 sec.

*97. The decrease in the potential energy of a ball of mass 20 kg which falls from a height of 50 cm iwill be choose which one is correct:*

(a) 968 J

**(b) 98 J**

(c) 1980 J

(d) None

*98. A body of mass 2 kg is thrown up vertically with a K.E of 490 J. If g = 9.8 ms*^{-2}* the height at which the kinetic energy becomes half its original value.*

(a) 10m

(b) 12.5m

**(c) 25 m **

(d) 50 m

*99. The K.E of a body of mass 2 kg and momentum 2 NS is choose which one is correct:*

**(a) 1 J**

(b) 2 J

(c) 3 J

(d) 4 J

*100. The momentum of particle is numerically equal to its K.E. What is the velocity of the particle choose which one is correct?*

(a) 9 ms^{-1}

(b) 3 ms^{-1}

**(c) 2 ms ^{-1}**

(a) 1 ms^{-1} \