The answer to every question is FALSE.

1) An assistant referee (linesman) should signal if he sees a foul.
FALSE. The law says the assistant should signal for offences which occur "out of the view of the referee". So if the assistant thinks the ref may have seen the incident, he should not wave his flag. The ref may decide, for a number of reasons, not to stop play for the incident and if the assistant flags, it will confuse players and undermine the ref's authority.

2) There should be corner flags and flags at the half-way line.
FALSE. The flags at the halfway line (which should be a metre back from the line) are optional but corner flags are compulsory.

3) At the start of a match, the team who win the toss decides which way to kick or can opt to take the kick-off.
FALSE. The team who win the toss choose which way to play. The team who lose the toss always kick off.

4) A player can be offside from his own team's goal-kick.
FALSE. No, he can't.

5) When a corner is taken, the ball must be placed completely inside the arced line.
FALSE. As long as part of the ball is on or behind the line, that's okay.

6) If a player tackles an opponent and makes contact with the ball, it is not a foul.
FALSE. It's a foul if he makes contact with the opponent before the ball. And even if he gets the ball first, it can be an offence if the ref thinks he is playing dangerously.

7) A goalkeeper cannot drop the ball and then pick it up again, but if he parries a shot he can dribble the ball to the edge of the area and then pick it up.
FALSE. If the goalkeeper deliberately parries the ball (rather than it rebounding from him accidentally) he is said to have controlled the ball with his hands and so cannot then use his hands again.

8) A goalkeeper who handles the ball outside his area must be booked or sent off.
FALSE. He should be sent off only if the handball prevented a clear goal-scoring chance. He should be booked if a free-kick is not sufficient punishment. A ref can decide the offence is not serious enough to warrant a card of any colour.

9) You can be booked for spitting.
FALSE. If you spit at someone, you must be sent off. If you spit on the ground, it's not an offence.

10) If you take a direct free-kick and the wind blows the ball into your own goal, it's a goal.
FALSE. No, it's a corner.

11) If a dog runs onto the pitch and stops a penalty, you just play on.
FALSE. If any "outside agency" touches the ball after the penalty has been taken, the kick has to be retaken. (Unless the ball has already hit the goalkeeper or the woodwork before hitting the dog. In that case, it's a drop ball).

12) It's a foul throw if the thrower stands with part of his foot on the pitch.
FALSE. As long as parts of both feet are on or behind the line, it's okay.

13) You're not offside if there is a defender on the goal-line.
FALSE. There must be two opponents between you and the goal-line. One is normally the goalkeeper, but if the goalkeeper has come out of his goal, there must be two other opponents.

14) A player who has a blood wound should leave the field immediately.
FALSE. Any player leaving the field without the referee's knowledge or permission should be booked.

15) A striker runs from an on-side position and takes the ball on his chest with his back to goal. Before he can turn to shoot, the goalkeeper knocks him over from behind. The keeper should be sent off for stopping a goal-scoring chance.
FALSE. The striker has to be moving towards the goal for this to be a red-card offence.