Which of the following statements are incorrect?
(i) A bag placed below the seat of a moving bus is in motion with respect to the floor of the bus.
(ii) While measuring length of an object using a metre scale, use the zero-mark even if the ends are worn out.
(iii) Blinking of eyes is an example of periodic motion.
(iv) If a body as a whole moves around in a circular path, the motion is known as revolution.

Options

A. (i), (ii) and (iv) only
B. (i), (ii) and (iii) only
C. (ii), (iii) and (iv) only
D. (i), (iii) and (iv) only

Answer

B

Explanation

(i) A bag placed below the seat of a moving bus is in rest with respect to the floor of the bus.
(ii) If ends of scale are worn out, we cannot measure the length of the object because it gives wrong measurement
(iii) Blinking of eyes is an example of random motion.