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Biology Test 42

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Biology Test 42
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Weekly Quiz Competition
  • Question 1
    4 / -1

    According to Newton`s Third Law of Motion, action and reaction are equal and opposite. The resultant force is not zero because

    Solution

    According to Newton`s Third Law of Motion, action and reaction are equal and opposite. The resultant force is not zero because they act on different bodies.

     

  • Question 2
    4 / -1

    A body falling under the action of gravity has

    Solution

    In a free fall, the weight is zero.

     

  • Question 3
    4 / -1

    The energy required in holding a weight of 20 kg at a height of 1m above the ground is:

    Solution

    PE = mgh = 20 x 10 x 1 = 200 J

     

  • Question 4
    4 / -1

    The ratio of SI units and CGS units of energy is

    Solution

    1 Joule = 107 ergs

     

  • Question 5
    4 / -1

    Which of the following units is different from the others?

    Solution

    Joule is the SI unit of energy and erg is the CGS unit of energy.

    1 kWh = 3600000 J = 3.6 x 106 J = 3.6 MJ

    Watt is a unit of power.

     

  • Question 6
    4 / -1

    Directions For Questions

    Directions: The following question has four choices out of which ONLY ONE is correct.

    ...view full instructions

    If the product of muscle and speed equals power, what does muscle stand for?

    Solution

    Power = Force x Speed

    Thus, muscle here stands for force.

     

  • Question 7
    4 / -1

    Which of the following is the commercial unit of energy?

    Solution

    Commercial unit of energy is kWh or Kilowatt hour.

     

  • Question 8
    4 / -1

    Commercial unit of energy is kWh or Kilowatt hour.

    Solution

    SI unit of energy is Joule.

    Commercial unit of energy is kWh.

    1 kWh = 1 kW x 1 h

    = 1000 W x 3600 s

    1 watt - second = 1 joule

    1 kWh = 3600000 J

    1kWh = 3.6 × 106 J = 1 unit

     

  • Question 9
    4 / -1

    A body is moved through a distance of 5 m in the following different ways. Maximum work is done when the body is

    Solution

    Maximum work is done when the body is raised vertically upwards. When the body is lifted upwards, there is a negative force which acts against the object and pulls it downwards, so it takes more force to lift it.

    Another reason is that, Work done = FS cos ϴ and while lifting vertically upwards, the angle between force and displacement is 00 and cos 00 is 1.

     

  • Question 10
    4 / -1

    A body is moved through a distance of 5 m in the following different ways. Minimum work is done when the body is

    Solution

    Minimum work is done when the body is pushed over smooth rollers because the friction will be less on smooth rollers, due to which lesser force will be required to push the body.

     

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