Correct Answer : aspect ratio, sweep angle, taper ratio
Explanation : Wing planform is shape of the wing when viewed from top. Aspect ratio will affect span and area. Overall planform will be affected by aspect ratio, taper ratio, sweep etc.
Correct Answer : Option (A) : Aileron
Explanation : Aileron is part of the wing. Rudder is part of vertical tail. Elevator is part of the horizontal tail. Horizontal tail is also called Horizontal stabilizer.
Correct Answer : Option (A) : to reduce adverse yaw-roll
Explanation : Inverted V tail arrangement is used to prevent the adverse yaw roll motion. Lift can be increased by flaps. Thrust is increased by an engine.
Correct Answer : Option (C) : To reduce wetted area
Explanation : V tail arrangement is used to combine horizontal and vertical tail. It combines in such way that the wetted area reduces. However, it generates adverse yaw roll motion. To prevent such effect inverted V tail can be used.