Solution:

A nuclear bomb.

Solution:

Photocopier Machine

Solution:

Kiwi

Kiwi is a bird.
Kiwi is a fruit.
Kiwi is a person ("Kiwi" is a common self-reference used by New Zealanders)

Solution:

A Mirror

Solution:

The letter 'X'.

X - 24th Letter of the alphabet.
XX - 20 in roman numerals.
XXX - labels for movies that are not clean.

Solution:

Eyes

Explanation:
We have black but we are not tea seeds - Pupil of eye
We have white buts we are not lime - sclera of eye
We have water but we are not a river - general tears in eyes to protect eyes.
We have feather but we are not birds - lashes.

Solution:

Either Rain Cloud Or Air

Explanation
=== Rain Cloud ===
I don't have a mouth but can roar - Thunder
I don't have eyes but can cry - Rain
I am really good - Rain is good
but bad sometimes - Storms
Without me, all will die - rain is the necessity for agriculture and human being

=== Air ===
I don't have a mouth but can roar - Wind
I don't have eyes but can cry - Moisture
I am really good - Rain is good
but bad sometimes - Hurricanes
Without me, all will die - Oxygen

Solution:

Breath

Solution:

A coconut.

Explanation:
Thirsty: she can drink coconut water.
Hungry she can eat coconut's malai.
Cold: she can burn the cover of the coconut.

Solution:

Egypt

Explanation:
: I Start where the time ends - TIME ends with 'E'
: My second is an expression of surprise - G (geee)
: My third is a question - Y(why)
: My fourth is urinate - P (Pee)
: I end with a drink - T (Tea)