PMS Physics

Class 8 Friction Important Questions  What is friction? Given an examples of frictions? What are uses of frictions ? What is lubricant?                                         Explain sliding friction is less than static friction ? Explain about the why objects moving in fluids must have special shapes ? What is rolling frictions ? What is sliding frictions ? Given an examples of sliding in frictions ? Given an examples of rolling frictions ? How can you reduce the frictions ? Is it  speed affect of  frictions ? What are they 4 ways increase the frictions  What are factors affecting frictions ? Is the  frictions the same for all the surface ? why is it difficult to walk on a smooth and wet floor ? when  you strike a match stick against the rough surface , it catches fire why ? what is reason ?

      Class 9 Motion Important Questions with answer   The numerical ratio of displacement to distance for a moving object is (a) always less than 1 (b) always equal to 1 (c) always more than 1 (d) equal or less than 1 if the displacement of an object is proportional to square of time, then the object moves with (a) uniform velocity (b) uniform acceleration (c) increasing acceleration (d) decreasing acceleration Which of the following situations is possible? (a) An object can have acceleration, but constant velocity. (b) The velocity of an object may be zero but acceleration is not zero. (c) Distance and the magnitude of displacement are equal in circular motion. (d) Average speed and the magnitude of average velocity are always equal in circular motion. The ratio of speed to the magnitude of velocity when the body is moving in one direction is (a) Less than one (b) Greater than one (c) Equal to one (d) Greater than or equal to one From the given υ – t graph, it can be in

    Class 9 Motion Important Questions  1. The numerical ratio of displacement to distance for a moving              object is           a) always less than 1                             b) always equal to 1           c) always more than 1                            d) equal or less than 1 2.  if the displacement of an object is proportional to square of time,         then the object moves with             a) uniform velocity                                 b) uniform acceleration           c) increasing acceleration                       d) decreasing acceleration 3.  Which of the following situations is possible?           a) An object can have acceleration, but constant velocity.           b) The velocity of an object may be zero but acceleration is not zero.           c) Distance and the magnitude of displacement are equal in      circular motion.           d) Average speed and the magnitude of average velocity are   always equal in circular motion 4. The ratio of speed