Q5. A particle of mass m is moving with speed u in a direction which makes 60° with
respect to x axis. It undergoes elastic collision with the wall. What is the
change in momentum in x and y direction?
Answer : Option AExplaination / Solution: No Explaination.
Q6.The position of an object moving in a straight line can be specified with reference to
Answer : Option AExplaination / Solution:
To describe motion along a straight line, we can choose an axis, say X-axis, so that it coincides with the path of the object. We then measure the position of the object with reference to a conveniently chosen origin, say O, Positions to the right of O are taken as positive and to the left of O, as negative.
Q8.A plane glass is placed over a various coloured letters (violet, green, yellow, red) The letter which appears to be raised more is,
Answer : Option DExplaination / Solution:
The refractive index (n) of the glass is different for different colours. For violet n is high.
∴ Violet travel with low speed, so deviation is high.
Answer : Option CExplaination / Solution:
because in wave propagation particles only moves in perodic motion, particles get collide with their neighbouring particles then transfer energy to them and comes back to their normal stage. Now next particle which gain energy get into excited state and starts moving periodically and get collide to next adjacent particle and so on. Thus in wave propagation particles only transfer their kinetic energy and momentum. Hence particles does not move therefore there is no flow of matter but there is movement of disturbance.