Explanation

Alexander Graham Bell invented an early version of the metal detector in 1881.

It was initially designed to locate a bullet inside President James Garfield.

Explanation

X-ray machines at airports scan luggage to identify weapons, explosives, and other banned items.

This helps ensure passenger safety and prevents dangerous objects from being carried onto planes.

Explanation

SpaceX uses giant "chopstick arms" on its launch tower to catch the Super Heavy booster during landing.

This system is part of its Starship program to make rocket recovery more efficient and reusable.

Explanation

Uranium is the most commonly used fuel in nuclear reactors due to its ability to undergo fission.

During fission, uranium atoms split to release a large amount of energy used for electricity generation.

Explanation

• 60-80 is the normal pulse rate of adult.
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• A normal resting heart rate for adults ranges from 60 to 100 beats per minute.
• A normal resting heart rate should be between 60 to 80 beats per minute, but it can vary from minute to minute.
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Explanation

Carrying capacity refers to the maximum number of individuals of a species that an environment can support over the long term without degrading the environment.