Everyday Science

Mount Everest, the world's highest mountain, is located in Nepal. It is part of the Himalayas and is the tallest peak on Earth.

Alexander Graham Bell is credited with inventing the telephone in 1876, making option B the correct answer. Samuel F. B. Morse invented the telegraph, Thomas Savery invented an early steam pump, and 'None of these' is incorrect.

Oxygen is the most abundant element in the Earth's crust, making up about 46% by weight. Nitrogen and hydrogen are not major components of the crust, so option C is correct.

Vitamin D deficiency leads to rickets, a condition characterized by soft and weak bones in children due to impaired calcium absorption. Smallpox and measles are viral infections unrelated to vitamin D levels.

Vitamin A deficiency primarily causes night blindness because it impairs the retina's ability to function in low light conditions. This is a well-established fact in nutrition and health science.

The unit of electric current is the Ampere, which measures the flow of electric charge per second. Joule is a unit of energy, and Watt is a unit of power, so they are incorrect in this context.

Physiology is the branch of biology that studies the normal functions and processes of living organisms and their parts. Therefore, option B correctly describes physiology as the study of normal functions in living creatures.

Long-sightedness (hypermetropia) is corrected using convex lenses because they converge light rays before they enter the eye, helping focus images correctly on the retina.

On average, a human breathes about 11,000 liters of air per day, considering normal respiratory rates and tidal volumes. This makes option A the correct choice.

Dry ice is the solid form of carbon dioxide (CO2). It sublimates directly from solid to gas at atmospheric pressure without becoming liquid.