MCQ - CBSE Class 9 Science Two friends on roller-skates are standing 5 m apart facing each other. One of them throws a ball of 2 kg towards the other, who catches it. How will this activity affect the position of the two? Explain your answer. 10/01/2023 Ajit kumar 112 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Suppose a ball of mass m is thrown vertically upward with an initial speed v, its speed decreases continuously till it becomes zero. Thereafter, the ball begins to fall downward and attains the speed v again before striking the ground. It implies that the magnitude of initial and final momentums of the ball are same. Yet, it is not an example of conservation of momentum. Explain why? 10/01/2023 Ajit kumar 74 Views 0 Comments Read more
MCQ - CBSE Class 9 Science A horse continues to apply a force in order to move a cart with a constant speed. Explain why? 10/01/2023 Ajit kumar 84 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Two identical bullets are fired one by a light rifle and another by a heavy rifle with the same force. Which rifle will hurt the shoulder more and why? 10/01/2023 Ajit kumar 107 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Two balls of the same size but of different materials, rubber and iron are kept on the smooth floor of a moving train. The brakes are applied suddenly to stop the train. Will the balls start rolling? If so, in which direction? Will they move with the same speed? Give reasons for your answer. 10/01/2023 Ajit kumar 89 Views 0 Comments Read more
MCQ - CBSE Class 9 Science There are three solids made up of aluminium, steel and wood, of the same shape and same volume. Which of them would have highest inertia? 10/01/2023 Ajit kumar 92 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Give the magnitude and direction of the net force acting on : 10/01/2023 Ajit kumar 106 Views 0 Comments Read more
MCQ - CBSE Class 9 Science According to Newton’s third law, every force is accompanied by equal and opposite force how then can anything move? 10/01/2023 Ajit kumar 63 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Air is thrown on a sail attached to a boat from an electric fan placed on the boat. Will the boat start moving? 10/01/2023 Ajit kumar 63 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Newton’s first law of motion is also called law of inertia. Why? 10/01/2023 Ajit kumar 51 Views 0 Comments Read more