Work MCQ

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• What is the mass of a unit volume of substance called?
  ক

  Density

  খ

  Pressure

  গ

  Buoyancy

  ঘ

  Force
• Which of the following can not be created nor be destroyed?
  ক

  Power

  খ

  Velocity

  গ

  Energy

  ঘ

  Force
• If a stationary force applied to an object, the object moved in the direction of force, is expressed as a result of force and displacement, it is called_
  ক

  Retardment

  খ

  Work done

  গ

  Impulse

  ঘ

  Acceleration
• An object of mass 50 kg is moving at a fixed velocity of 6 ms^-1. Calculate the momentum of the object.
  ক

  300 kg ms^-2

  খ

  300 kg ms^-1

  গ

  30 kg ms^-1

  ঘ

  30 kg ms^-2
• Energy conservation means
  ক

  Generation and destruction of energy

  খ

  Energy could be created

  গ

  Energy could not be created but destroyed

  ঘ

  Energy can neither be created nor destroyed
• Potential energy is equal to-
  ক

  m(-g)h

  খ

  mgh

  গ

  Fs

  ঘ

  $$\frac{1}{2}m{v^2}$$
• An object has a potential energy of 400J with a mass of 20kg and a gravity of 10 m/s², what is the height of that object?
  ক

  0.5m

  খ

  4m

  গ

  1m

  ঘ

  2m
• In which of the following situations is the work done by negative force?
  ক

  When an object moves in a direction perpendicular to the direction of force

  খ

  When the object moves at an angle in the direction of force

  গ

  When an object moves in the opposite direction of force

  ঘ

  When an object moves in the direction of force
• If a person pulls the trolley up to the distance of 10 m with the force of 50 N, what will be the work done by him?
  ক

  5J

  খ

  500J

  গ

  20J

  ঘ

  0.2J
• An example of pulling is-
  ক

  Hoisting the flag

  খ

  Opening the door

  গ

  Lifting the curtain

  ঘ

  Pushing the boy
• A 4.0 kg object is moving horizontally with a speed of 5.0 m/s. To increase its speed to 10 m/s, the amount of net work required to be done on this object is:
  ক

  150J

  খ

  100J

  গ

  75J

  ঘ

  50J
• Which one among the following happens when a swing rises to a certain height from its rest positions?
  ক

  Its potential energy decreases while kinetic energy increases

  খ

  Its kinetic energy decreases while potential energy increase

  গ

  Both potential and kinetic energy decreases

  ঘ

  Both potential and kinetic energy increases
• In wind power, which form of energy is converted into electrical energy?
  ক

  Kinetic energy

  খ

  Potential energy

  গ

  Solar energy

  ঘ

  Radiant energy
• An object of 20kg mass is moving at speed of 10m/s. What is the kinetic energy obtained by the object?
  ক

  1000Pa

  খ

  1000J

  গ

  1000Nm^-2

  ঘ

  1000N
• The product of mass and velocity is called:
  ক

  buoyancy force

  খ

  momentum

  গ

  pressure

  ঘ

  force
• When an object of 12kg is at a height of 5m from the ground, then the energy contained in it will be? (g = 9.8ms^-2)
  ক

  539J

  খ

  520J

  গ

  528J

  ঘ

  588J
• A bullet of mass 12 g is fired from a rifle. The bullet takes 0.006 second to move through its barrel and leaves it with a velocity of 300 m/s. What is the force exerted on the bullet by the rifle?
  ক

  720 Newton

  খ

  180 Newton

  গ

  900 Newton

  ঘ

  600 Newton
• Which of the following does not affect the value of acceleration due to gravity?
  ক

  Mass

  খ

  Vertically

  গ

  Size of earth

  ঘ

  Depth
• Which physical quantity is represented by the ratio of momentum and velocity of the body?
  ক

  Velocity

  খ

  Acceleration

  গ

  Mass

  ঘ

  Force
• A 40 kg girl quickly climbs up the stairs to 5m height in 4 sec, what will be the power developed by her?
  ক

  500W

  খ

  200W

  গ

  2000W

  ঘ

  100W
• What does the kinetic energy equal?
  ক

  $$\frac{1}{2}m{v^2}$$

  খ

  mgh

  গ

  mv

  ঘ

  Ma
• A constant force acts on an object of mass 5 kg for a period of 2 seconds. This increases the velocity of the object from 4 ms^-1 to 7 ms^-1. Find the amount of force used.
  ক

  5.5 N

  খ

  8.5 N

  গ

  7.5 N

  ঘ

  4.8 N
• If the work done is negative, then what will be the angle between the force and displacement?
  ক

  45°

  খ

  0°

  গ

  90°

  ঘ

  180°
• Capacity of doing work is known as-
  ক

  Power

  খ

  Pressure

  গ

  Energy

  ঘ

  Force
• When a body falls freely under gravity then the work done by gravity is
  ক

  Positive

  খ

  Negative

  গ

  Zero

  ঘ

  Infinity
• What is wrong statement about kinetic energy?
  ক

  During static state the energy contained in the object is called kinetic energy

  খ

  The energy received by an object based on its speed is known as kinetic energy

  গ

  $$K.E. = \frac{1}{2}\left( {m{v^2}} \right)$$

  ঘ

  Moving objects have kinetic energy
• A stone is dropped from the roof of a house towards the ground. The kinetic energy of the stone will be maximum
  ক

  just after it is dropped

  খ

  when it is just on the half-way

  গ

  just before it touches the ground

  ঘ

  when it touches the ground
• . . . . . . . . particles have a greater kinetic energy-
  ক

  Liquid

  খ

  Plasma

  গ

  Solid

  ঘ

  Gas
• A force of 125 N is acting on an object, that object is moved up to 5 m in the direction of the force, what will be the work done by the force.
  ক

  625W

  খ

  625Pa

  গ

  625N

  ঘ

  625J
• An 8 kg iron ball and an 3 kg aluminium ball are dropped from a height of 20 meters. Which of the following quantity amount will be same in them above 10 m height from the ground?
  ক

  Kinetic energy

  খ

  Acceleration

  গ

  Potential energy

  ঘ

  Momentum