Everyday Science

Sea water freezes last because it contains salt, which lowers its freezing point compared to fresh water sources like rivers, canals, and lakes.

Natural fats and oils are triglycerides composed primarily of carbon, hydrogen, and oxygen atoms. They do not contain nitrogen, so option A is correct.

The World Health Organization recommends a balanced diet with approximately 55-75% carbohydrates, 10-15% proteins, and 15-30% fats. Option A (Carbohydrates 58% + Proteins 12% + Fats 30%) fits within these recommended ranges, making it the correct choice.

Vitamin C is abundantly found in fresh vegetables and fruits, making option C the correct answer. Green leafy vegetables contain some vitamin C but generally less than fruits like oranges and lemons. Seeds and seafood are not significant sources of vitamin C.

Jupiter is known as the 'bodyguard' of Earth because its strong gravitational field attracts or deflects many comets and asteroids, reducing the number that reach Earth.

The Great Red Spot is a giant storm located on the planet Jupiter, making option D the correct answer.

A total solar eclipse occurs when the Moon completely covers the Sun as seen from Earth. The reason total eclipses are rare and sometimes absent is due to the Moon's elliptical orbit around Earth, which causes variations in its apparent size. When the Moon is farther away, it appears smaller and cannot fully cover the Sun, resulting in an annular eclipse instead of a total one.

Dry ice is the solid form of carbon dioxide (CO2). It sublimates directly from solid to gas at -78.5°C without becoming liquid, which is why it is commonly used as a cooling agent.

Injection of heroin involves using needles, which can transmit HIV if needles are shared, making it the drug abuse form with the highest risk of HIV infection among the options.

The common mineral salt present in sweat is sodium chloride, which is essentially table salt. Sweat contains water and dissolved salts, primarily sodium chloride, which helps regulate body temperature and electrolyte balance.