Solution:

A is a female.

Statement used by A is true only if both parts are true.

Solution:

Twinkle and Rinki start on opposite sides of the river

Solution:

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

(No sun at night)

Solution:

Mark Benson '?' = question MARK, so the note on the door reads 'Question Mark Crimson broke your window.'

Solution:

Sunday

Explanation:
71 days = 10 week + 1 day.
+1 day implies Sunday.

Solution:

The original password for Jasmine's account was 'changed' and the new password is 'distinct'.

Solution:

3 pounds

Explanation:
Since one-quarter of the iron block weighs three-quarter of a pound, the whole the iron block will weigh (3/4 * 4 pounds).

Solution:

Yes, a married person is looking at Sooraj, who is unmarried. If Shaina is unmarried, Pulkit is looking at her who is married.

Solution:

==Solution 1==
Pamela is Michael's daughter. This is because Michael is Shelly's son. Also he is married to one of the Joseph's daughters. Joseph's other daughter is married to Harry and Danny is their son.

==Solution 2==
Michael and Harry are brothers. Shelly is their mother. In this case, 'Harry's wife's sister's husband's mother's son' refers to Harry himself. Thus, Danny is Michale's son and Pamela is Harry's daughter which means that Pamela is Michael's niece.

Solution:

First climb the first rope and carry the end of the second one with you. Now cut the first rope and flush with the ceiling, then swing down on the second. This time, climb up the second and cut that flush with the ceiling as well but only part way till it can withstand your weight. Now slowly climb down till you're just short of the bottom. Now tie a tiny loop at this portion and climb up some two feet. Then secure the loop about your feet and jump to the ground. With a three feet fall, you won't be hurt but the force will snap off the rope at top and you will have the whole rope with you.