1. Which cloud types would indicate convective turbulence? a. Nimbostratus clouds. b. Cirrus clouds. c. Towering cumulus clouds. 2. Which would decrease the stability of an air mass? a. Cooling from below. b. Warming from below. c. Decrease in water vapor. 3 What are the characteristics of stable air? a. Poor visibility; steady precipitation; stratus clouds. b. Poor visibility; intermittent precipitation; cumulus clouds. c. Good visibility; steady precipitation; stratus clouds. 4. A coded transponder equipped with altitude reporting equipment is required for: a. both of the other answers. b. Class A Class B, and Class C airspace areas. c. all airspace of the 48 contiguous U.S. and the District of Columbia at and above 10,000 feet MSL (including airspace at and below 2,500 feet above the surface). 5. The commercial pilot operating as the pilot in command of an aircraft may accept or decline a land and hold short clearance (LAHSO): a. when operating for hire. b. at night. c. any time