Solution:

The watchman had been sleeping on the job. Otherwise, he would not have been dreaming.

Solution:

I am a Postbox

Remove as many letters as possible, still postbox remains the same.

Solution:

I have written 'your exact weight' on the paper.

Solution:

Each word rhymes with its numeric position in the list. (e.g. 'gun' rhymes with 'one'
etc.)

Solution:

Bookkeeper (00 kk ee)

Solution:

Twinkle and Rinki start on opposite sides of the river

Solution:

1st person : Colin
2nd person : Rooney

They both lied.(I said at-least)
(If only one lied they would both be boys or both be girls)

Solution:

Throw the ball straight up in the air.

Solution:

A lion, king of the jungle! (the head of a Lamb, the middle of a pIg, the hind of a buffalO and the tail of a dragoN)

Solution:

Velma waits until night time and then goes through the second door.

(No sun at night)