MCQ - CBSE Class 9 Science Can any object have momentum even if its mechanical energy is zero? Explain. 10/03/2023 Ajit kumar 96 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Can any object have mechanical energy even if its momentum is zero? Explain. 10/03/2023 Ajit kumar 90 Views 0 Comments Read more
MCQ - CBSE Class 9 Science A boy pushes the wall in the class for five minutes but the wall does not move. Another boy pushes the chair from front to the back side of the class. In which case, more work is done. 10/03/2023 Ajit kumar 66 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Why the water at the bottom of waterfall warmer than the water on the top ? 10/03/2023 Ajit kumar 98 Views 0 Comments Read more
MCQ - CBSE Class 9 Science A spring which has been kept compressed by tying its ends together is allowed to be dissolved in an acid. What happens to the potential energy of the spring ? 10/03/2023 Ajit kumar 73 Views 0 Comments Read more
MCQ - CBSE Class 9 Science A person is climbing a palm tree : 10/03/2023 Ajit kumar 113 Views 0 Comments Read more
MCQ - CBSE Class 9 Science When a ball is lifted to a height of h when it is dropped just before touching the ground, what would the kinetic energy acting on the ball ? 10/03/2023 Ajit kumar 105 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Define work done by a constant force on an object. Write an expression also for the work done. 10/03/2023 Ajit kumar 95 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Define: (a) power (b) work done (c) kinetic energy. Give SI unit of each. 10/03/2023 Ajit kumar 69 Views 0 Comments Read more
MCQ - CBSE Class 9 Science A boy throws a rubber ball vertically upwards. What type of work is done; (a) by the force applied by the boy (b) by the gravitational force ? Support your answer with reason. 10/03/2023 Ajit kumar 65 Views 0 Comments Read more