A.MCQs: 1. The atmosphere of the earth is attached with the earth due toa. gravitational force b. wind c. cloud d. magnetic field of earth2. Work done on the body is equal to change in it’s a. kinetic energy only b.potential energy only c. mechanical energy only d.energy3. Density of a substance is defined as mass per unit _______a.volume b.force c.time d.all of these4. Water stored in dam possessesa. no energy b. electrical energy c. kinetic energy d. potential energy5. SI unit of power is a. watt b. joule c. Newton d.meterB.Fill in the blanks: 1. The earth and other planets revolve around the __________2. __________ is used to determine the purity of a sample of milk.3. ___________ law is used in designing ships and submarines.4. The ability of an object to do work due to its position or shape is called __________5. Kinetic energy is expressed by _________.C. Very short questions: 1. From where do we get energy for the life processes?2. What is the kinetic energy of an object?3. Define energy?4. Which energy is stored in a stretched rubber band?5. State the law of conservation of energy?6. Define Archimedes principle.7. Who formulated the universal law of gravitation?8. Define density?9. Which force is required to keep a body in uniform circular motion?10. What will happen to the gravitational force between two bodies if the mass of one body is doubled?D. Long Questions: 1. Give two examples from everyday life where work is done?2. Write different forms of energy?3. What is the importance of the universal law of gravitation?4. How is gravitation different from gravity?5. Write three applications of Archimedes principle?​