Question:
Which of the following statement is not correct about the characteristics of
cathode rays?
(i) They start from the cathode and move towards the anode.
(ii) They travel in a straight line in the absence of an external electrical or
magnetic field.
(iii) Characteristics of cathode rays do not depend upon the material of
electrodes in a cathode ray tube.
(iv) Characteristics of cathode rays depend upon the nature of gas present
in the cathode ray tube.
Solution:
Option (iv) Characteristics of cathode rays depend upon the nature of gas present
in the cathode ray tube is the answer.