If you set your watch by the sound of a distant siren, will it go fast or slow?

What will you hear if you were to move away from a siren with speed of sound?

Rewrite each of the following statements in the form p if and only if q p: if you watch television then your mind is free and if your mind is free then you watch television.

Which characteristic of the sound help you to identify your friend by this voice while sitting with others in a dark room.

Explain this common observation clearly : If you look out of the window of a fast moving train, the nearby trees, houses etc. seem to move rapidly in a direction opposite to the train’s motion, but the distant objects (hill tops, the Moon, the stars etc.) seem to be stationary. (In fact, since you are aware that you are moving, these distant objects seem to move with you).

Rewrite the following statement in the form"p if and only if q":- p: If you watch television, then your mind is free and if your mind is free, then you watch television.