Question

2. Leaves fall down on the ground due to - a. frictional force b. gravitational force c. muscular force d. electrostatic force 3. State of motion is described by – a. position of rest b. position of motion c. both the above d. none of the above false true false false false false false true false 4. A spring balance is used for measuring – a. speed b. weight c. pressure d. mass 5. Force helps toa. move a stationary body b. change the speed of a body c. change the shape of a body d. all the above 6. Which of the following produces least friction? a. sliding friction b. rolling friction c. static friction d. composite friction 7. To sharpen the blade of a knife by rubbing it against a surface, which of the following will be most suitable? a. stone b. wooden block c. plastic block d. glass block 8. Friction due to fluids is called – a. force b. pressure c. friction d. drag 9. Which of the following is not a smooth surface? a. surface of tyres b. surface of mirror c. glazed tiles d. surface of wet soap 10. Force of friction depends on – a. roughness of surface b. smoothness of surface c. inclination of surface d. all of these

Answer 1

Answer:

b) gravitational force

Answer 2

Explanation:

b) due to gravitational force