Question

17..Which of the following are not correct?
(i) The basic unit of time is second.
(ii) Every object moves with a constant speed.
(iii) Distances between two cities are measured in kilometers.
(iv) The time period of a given pendulum is not constant.(v) The speed of a train is expressed in m/h

Ans....

a. (ii),(iv),(v)
b. (i), (ii), (iii)
c. (v) and (iv)
d. (iii), (iv), (v)​

Answer 1

Answer:

option A is right

Explanation:

the explanation to this question is for iind it's not neccessary. for iv it's a completely wrong statement ...pendulum moves constantly and for vth not necessarily..

hope it helps

Answer 2

Answer:

(a) (ii), (iv), (v) are not correct