Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

How many words can a pen with half refill write?

John was going on a jungle trip. He asked his wife to pack something to eat, something to drink and something to burn if he feels cold in the jungle. When John opens the backpack he found just one thing in the bag. What was it?

A bomb exploded in a room full of married couples and no one died. How?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

I am eight letters long - "12345678"
My 1234 is an atmospheric condition.
My 34567 supports a plant.
My 4567 is too appropriate.
My 45 is a friendly thank-you.
My 678 is a man's name.

What word am I?

Can you quickly find which two matchstick figures are identical?

Why is the Hole below a Lock?

10+10 and 11+11 can give you the same answer.

Explain how?

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?