What does this rebus riddle means ?

Rebus Puzzle Definition: A rebus is an illusion device that uses pictures to represent words or parts of words.
What does This Rebus Puzzle Identify?

What jumps when it walks and sits when it stands?

In the image below, can you find the value of an angle(y)

There is one four-digit whole number n, such that the last four digits of n2 are the original number n

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

Two brothers were watching a horror film on video late one night. One brother dozed off and dreamed that he was being chased by the crazy man from the movie, who was trying to kill him. In the dream, he hid in a cupboard. There was no sound except his heart pounding, and he had no idea where his crazed captor was. He was terrified! At that moment, the video finished, and his brother put his hand on the shoulder of his sleeping sibling to wake him. The shock at that tense moment was enough that the sleeping brother suffered a massive heart attack and died instantly. True or false?

Can you find the largest Three-digit number whose sum is 14 and whose square is less than 5,00,000?

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

If two's company, and three's a crowd, then whats four and five ?