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Work, Energy and Power Test - 24

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Work, Energy and Power Test - 24
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  • Question 1
    4 / -1
    A ball dropped from a height of 4m rebounds to a height of 2.4m after hitting the ground. Then the percentage of energy lost is
    Solution

  • Question 2
    4 / -1
    A body of mass m1 is moving with a velocity v. It collides with another stationary body of mass m1. They get embeded. At the point of collision, the velocity of the system
  • Question 3
    4 / -1
    Assertion : In the elastic collision between two bodies, the relative speed of the bodies after collision is equal to the relative speed before the collision.
    Reason : In the elastic collision the linear momentum of the system is conserved.
  • Question 4
    4 / -1
    Assertion : When a gas is allowed to expand, work done by gas is positive.
    Reason : Force due to gaseous pressure and displacement (of position) on in the same direction.
  • Question 5
    4 / -1
    Assertion : A light body and heavy body have same momentum. Then they also have same kinetic energy.
    Reason : Kinetic energy does not depend on mass of the body.
  • Question 6
    4 / -1
    Assertion : Mountain roads rarely go straight up the slope.
    Reason : slope of mountains are large, therefore, more chances of vehicle to slip from roads.
  • Question 7
    4 / -1

  • Question 8
    4 / -1
    Assertion : The mass equivalent of 1000 kwh energy is 40 microgram.
    Reason : This follows from E = mc2 where C = 3 × 108 m/s
  • Question 9
    4 / -1
    Assertion : Two bodies of different masses have same momentum. Their kinetic energy are in the inverse ratio of their masses.
    Reason : K.E. = 1/2 mv2
  • Question 10
    4 / -1
    Assertion : Linear momentum is conserved in both, elastic and inelastic collisions.
    Reason : Total energy is conserved in all such collisions.
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