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5.work,energy,power and collision — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics5.work,energy,power and collision1 Mark
MCQ
Identify the correct statements from the following:

$(A)$ Work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket is negative.

$(B)$ Work done by gravitational force in lifting a bucket out of a well by a rope tied to the bucket is negative.

$(C)$ Work done by friction on a body sliding down an inclined plane is positive.

$(D)$ Work done by an applied force on a body moving on a rough horizontal plane with uniform velocity in zero.

$(E)$ Work done by the air resistance on an oscillating pendulum in negative.

Choose the correct answer from the options given below:

  • ✓
    $B$ and $E$ only
  • B
    $A$ and $C$ only
  • C
    $B, D$ and $E$ only
  • D
    $B$ and $D$ only
✓

Answer

Correct option: A.
$B$ and $E$ only
a

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