7th- TN(state board)-chapter-Force and Motion Choose the best answer. 1. A particle is moving in a circular path of radius r . The displacement after half a circle would be a. Zero   b. R c. 2 r d. r / 2 Explanation: Ans: c Displacement at half path is the shortest distance between the initial and final point. So, it's equal to twice the radius of the circle = 2 r. 2. From the given v-t graph it can be inferred that the object is a. in uniform motion b. at rest c. in non uniform motion d. moving with uniform acceleration Explanation: Ans: d An object undergoes uniform acceleration when the change (increase or decrease) in its velocity for every unit of time is the same. 3. Which of the following figures represent uniform motion of a moving object correctly? Explanation: Ans: d 4. Suppose a boy is enjoying a ride on a marry go round which is moving with a constant speed of 10 m