They could be yelling because they are in a competition or trying to get someone's attention. Sometimes, it's just a way for them to express their emotions freely.
Kids in cartoons are typically portrayed in a way that makes them relatable and appealing to the audience. They might have magical powers or go on wild adventures, but at the core, they show the innocence and wonder of childhood.
It seems that 'bichray gay ab kaise novel' is a very mysterious and perhaps not - well - formed description related to a novel. If we assume 'bichray' is a character or a theme, 'gay' might be a quality associated with it like being cheerful. 'Ab kaise' could be something like 'how now'. However, this is all just speculation. To really understand, we would need more information such as the origin of this phrase, the language it comes from originally, and any related cultural or literary context.
Cartoon learning for kids is definitely useful. It catches their interest, and when they're interested, they're more likely to absorb the knowledge. Plus, cartoons often use repetition and colorful visuals to reinforce learning.