A paddleboat is typically classified as a type of simple machine known as a wheel and axle. The rotation of the paddles (wheels) attached to the axles propels the boat through the water by transferring energy from the paddler's movement.
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A roof is not a simple machine. It is a structure built to provide shelter and protection from the elements.
A pin is classified as a type of fastener and not a simple machine. It is often used to secure two materials together.
A tack is a type of wedge, which is a simple machine that is used to push things apart or hold things together.
A projector screen is a type of lever simple machine when it is manually pulled down or rolled up. It can also be considered a pulley simple machine if it is motorized to retract or extend the screen.
A bulb is not a simple machine; it is an electrical device that produces light. Simple machines include levers, pulleys, inclined planes, screws, wedges, and wheels and axles.