With reference to Unmanned Aerial Vehicles (UAVs), consider the following statements:

How many of the statements given above are correct?

(a) Only one

(b) Only two

(c) All the three

(d) None

Answer: (d) None

Explanation:

• Statement I is incorrect – All types of UAVs cannot do vertical landing.

  • Only VTOL UAVs (Vertical Take-Off and Landing) such as quadcopters and some hybrid drones can land vertically.

  • Fixed-wing UAVs require runways or catapult systems and cannot perform vertical landing.

• Statement II is incorrect – All types of UAVs cannot do automated hovering.

  • Hovering is possible only in rotary-wing UAVs like quadcopters or helicopters.

  • Fixed-wing UAVs cannot hover because they require continuous forward motion to generate lift.

• Statement III is incorrect – All UAVs do not use batteries as their only power source.

  • UAVs may use internal combustion engines, hybrid fuel systems, solar power, or hydrogen fuel cells, in addition to batteries.

  • Large military UAVs like MQ-9 Reaper use fuel-based engines, not batteries.

• Conclusion:

  • Since all three statements are incorrect, the correct answer is (d) None.