25th December 2025

Explanation: A speed gun operates on the principle of the Doppler effect. It emits radio waves at a specific frequency towards a moving object. When these waves are reflected back, their frequency changes based on the object's speed. If the object is approaching, the reflected waves have a higher frequency, and if it's moving away, the frequency is lower. The speed gun's internal computer calculates the object's speed by measuring this frequency shift. This method allows for accurate speed measurement over various distances and velocities without being affected by factors like air resistance

Explanation: Statements 1 and 2 are correct, while statement 3 is incorrect.
Statement 1 is correct. The Ethiopian wolf is a specialized rodent hunter in Afroalpine ecosystems, which are unique African high-altitude regions
Statement 2 is correct. Recent research has highlighted that the Ethiopian wolf feeds on the nectar of the red and yellow Ethiopian red hot poker flower, potentially contributing to pollination
Statement 3 is incorrect. While the Ethiopian wolf is indeed Africa's most endangered carnivore, its population is fewer than 500 individuals, not over 1000

Explanation: Both statements are correct.
Statement 1 is correct. Cephalopods are characterized by a completely merged head and foot, with a ring of arms and/or tentacles surrounding the head. The arms, tentacles, and funnel are all derivatives of the foot
Statement 2 is correct. Locomotion in cephalopods is accomplished mainly by jet propulsion

Explanation: Dark patterns are deceptive design patterns using user interface/user experience interactions on any platform, designed to mislead or trick users to do something they originally did not intend or want to do. This definition aligns with option (b), which describes it as a deceptive user interface design that misleads consumers.

Explanation: All three statements are correct. The Panama Canal connects the Pacific Ocean to the Caribbean Sea (which is part of the Atlantic Ocean). It uses a sophisticated lock system that acts as water elevators to raise and lower ships. The United States had sole control of the canal from its opening in 1914 until December 31, 1999, when it was transferred to Panama.