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Work, Energy and Power Test - 6

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Work, Energy and Power Test - 6
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  • Question 1
    1 / -0
    If force is applied on a body and it undergoes displacement, what is said about this event?
    Solution
    The product of force and displacement in the direction of force is known as the work done.
    So, work = force x distance.
    Therefore, we say that work is said to be done when force acting on it moves it.
  • Question 2
    1 / -0
    Which of the following options represents a unit of work?
    Solution
    Joule is a unit of work. One joule is defined as the amount of energy exerted when a force of one newton is applied over a displacement of one metre, which is known as work done. The joule is a derived unit of energy in the International System of Units.
  • Question 3
    1 / -0
    Which of the following represents work done against gravity?
    Solution
    Assume that an object is displaced from the surface of the earth to a certain height h. Gravitational force is acting downwards and the displacement is in the upward direction. So, the angle between them is 180° and the work done by gravitiy is negative.
  • Question 4
    1 / -0
    If a force of 1 newton acting on a body displaces it by 1 metre in the dirction of force, what is the resulting unit called?
    Solution
    Work done is said to be1 joule if a force of 1 Newton acting on a body displaces it by 1 meter in the direction of force.
    It has unit N-m.
  • Question 5
    1 / -0
    Which of the given options represents the formula for work done?
    Solution
    The product of force and displacement in the direction of force is known as the work done.
    So, work = force x distance.
  • Question 6
    1 / -0
    What expression is used for finding the total mechanical energy of a body?
    Solution
    Total energy possessed by a body is called its mechanical energy.
    It is the sum of potential and kinetic energy of the body.
  • Question 7
    1 / -0
    A man carrying a suitcase is walking on a plane surface. What is the work done by the man on the suitcase?
    Solution
    A man is walking on a plane surface with a suitcase. Here, force and displacement are perpendicular to each other. when force and displacement are perpendicular, so cos 90° = 0. Hence, the work done is zero.
  • Question 8
    1 / -0
    What is the formula for finding the kinetic energy of a moving object?
    Solution
    mv2 is the formula for kinetic energy where m is the mass of the body and v is the velocity with which body/object is moving.
  • Question 9
    1 / -0
    Photography, photosynthesis and photoelectric effect are related to which of the following forms of energy?
    Solution
    Photography, photosynthesis and photoelectric effect are related to light energy.
  • Question 10
    1 / -0
    What is the frequency range of audible sound?
    Solution
    Standard range of audible frequencies is 20 to 20,000 Hz, although the range of frequencies the individuals hear is greatly influenced by environmental factors.
  • Question 11
    1 / -0
    What is the term used for conversion of energy from one form to another?
    Solution
    Transformation of energy is used for conversion of energy from one form to another.
  • Question 12
    1 / -0
    If the speed of a moving body is doubled, what will be the change in the kinetic energy of the given body?
    Solution
    Kinetic energy = mv2 where, 'm' is the mass of the body and 'v' is the velocity with which body is moving.
    When v is changed to 2v then value of new kinetic energy becomes 4 times the original kinetic energy as square of velocity is present in the formula.
  • Question 13
    1 / -0
    If the speed of a body is halved, what is the change in its kinetic energy?
    Solution
    mv2 is the formula for kinetic energy where m is the mass of the body and V is the velocity with which body is moving. When v is changed to , then the new value of kinetic energy becomes th of the original kinetic energy.
  • Question 14
    1 / -0
    A ball of mass 200 gm falls from a height of 5 m. What is its kinetic energy when it just reaches the ground?
    Solution
  • Question 15
    1 / -0
    What is the kinetic energy of a body of 1 kg moving at the speed of 2 m/s?
    Solution
    mv2 is the formula for kinetic energy
    where 'm' is the mass of the body and 'V' is the velocity with which body is moving.

    Here, m = 1 kg and v = 2 m/s.
    So, kinetic energy = (1) (2)2
    = 2 J
  • Question 16
    1 / -0
    What s the SI unit of power?
    Solution
    SI unit of power is watt which is equal to the time rate of doing one joule of work.
  • Question 17
    1 / -0
    What is equivalent value of 1 horse power in watts?
    Solution
    One horsepower is equal to 745.69 watts.
    Or 1 hp (I) = 746 W
  • Question 18
    1 / -0
    What is the value of 1 kilo watt numerically equivalent to?
    Solution
    1 kilo watt (1 kW) = 1000 watt or 103 watt
  • Question 19
    1 / -0
    Two bodies A and B of equal masses are kept at heights of h units and 2h units respectively. What is the ratio of their potential energies?
    Solution
    Potential energy of the body placed at a height h units = mgh.
    Potential energy of the body which is placed at a height 2h units = 2 mgh.
    So, the ratio of potential energies of given two bodies = 1 : 2
    Therefore, 1st option is the correct answer.
  • Question 20
    1 / -0
    A boy weighing 45 kg jumps vertically upwards from the ground. What will be his kinetic energy at the highest point?
    Solution
    mv2 is the formula for kinetic energy.
    where, m is the mass of the body and v is the velocity with which body is moving.

    Since, velocity at the highest point = 0

    Therefore, kinetic energy at the highest point = 0 J
  • Question 21
    1 / -0
    What is the mathematical expression of Momentum?
    Solution
    The product of mass and linear velocity of a body is called linear momentum of the given body.
    Momentum is a vector quantity.
  • Question 22
    1 / -0
    On what parameter does the escape velocity of a body does not depend?
    Solution
    The value of escape velocity does not depend upon the mass of the projected body.
    It depends on the mass and radius of the earth from which it is being projected.
  • Question 23
    1 / -0
    What is the value of escape velocity for all the objects projected from earth's surface?
    Solution
    The value of escape velocity does not depend upon the mass of the projected body, instead it depends on the mass and radius of the planet from which it is being projected.
    The value of escape velocity for objects projected from the earth's surface = 11.2 km/s
  • Question 24
    1 / -0
    What is the value of work done when an object of mass 2 kg is raised upto a vertical height of 1 m?
    Solution
    Work done = mgh
    Work done = (2)(9.8)(1)
    Work done = 19.6 J
    Therefore, 19.6 J is the value of work done for lifting the given object vertically through a distance of 1 metre.
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