Tag: science & technology

The cheetah is the fastest land animal, capable of reaching speeds up to 60-70 mph in short bursts. Lions are fast but not as quick as cheetahs. Zebras are prey animals and 'none' is incorrect.

White blood cells (leukocytes) are the primary cells of the immune system that protect the body from infection and disease. Red blood cells carry oxygen, nerve cells transmit signals, and platelets help with blood clotting (option D is misspelled).

All elements are composed of atoms, which are the smallest unit of matter that retains the chemical properties of an element. Metals, ions, and compounds are not fundamental building blocks of elements.

The Wright Brothers (Orville and Wilbur Wright) invented and flew the first successful airplane in 1903. They are credited with pioneering controlled, sustained flight.

DC (Direct Current) power supply has zero frequency because the current flows in one direction only and does not alternate periodically like AC (Alternating Current).

DC (Direct Current) power supply has zero frequency because the current flows in one direction only and does not alternate periodically like AC (Alternating Current). This is a duplicate of entry 72364.

DC (Direct Current) power supply has zero frequency because the current flows in one direction only, unlike AC (Alternating Current) which periodically reverses direction. Frequency is the number of cycles per second, and DC has no oscillation or cycles.

DC (Direct Current) power supply has zero frequency because the current flows in one direction only, unlike AC (Alternating Current) which periodically reverses direction. Frequency is the number of cycles per second, and DC has no oscillation or cycles.

DC (Direct Current) power supply has zero frequency because the current flows in one direction only, unlike AC (Alternating Current) which periodically reverses direction. Frequency is the number of cycles per second, and DC has no oscillation or cycles.

DC power supply provides direct current which flows in one direction without changing direction or magnitude periodically. Unlike AC (alternating current) which oscillates and has frequency, DC has zero frequency.