91. Assertion (A): A man standing on a completely frictionless surface can propel himself by whistling.
Reason (R): If no external force acts on a system, its momentum cannot change.
Reason (R): If no external force acts on a system, its momentum cannot change.
92. Which of the following objects will have potential energy?
93. What will be the value of the kinetic energy of an object moving along the mass of 'm' if its speed is changed from 'v' to '2v' ?
94. If force (F) and acceleration (a) are given, then the formula for finding the mass (m) of an object is . . . . . . . .
95. A moving car faces the wind in the opposite direction. What will be the work done by the wind on the car?
96. What is the change in the total energy of a body falling freely towards the earth?
97. Work can only be done when . . . . . . . . is present.
98. The kinetic energy of an object of mass 10kg moving at a speed of 6ms-1 is-
99. When you stretched a rubber band, the energy stored in it?
100. A boy raises a box with a weight of 120 N through a height of 2 m. The work done by the boy is-
Read More Section(Work, Energy and Power)
Each Section contains maximum 100 MCQs question on Work, Energy and Power. To get more questions visit other sections.