681. One of the following is a water-soluble vitamin, Vitamin C.
682. Fuse wire is made of 63% tin and 37% lead.
683. The alpha particles are compact clusters of two protons and two neutrons.
684. Secretin is not an enzyme.
685. The human brain uses about 20 percent of the total oxygen and blood in the body.
686. The SI unit of time is second.
687. The main function of the kidney is to remove waste from blood.
688. Sound cannot travel through a vacuum.
689. An iron pipe feels colder than a wooden window because iron is a better conductor.
690. The human brain uses approximately 20 percent of the total oxygen and blood in the body.
691. The longest bone in the human body is the femur.
692. Carbon dioxide gas is used in the preparation of soft drinks.
693. When our sun reaches the end of its red giant phase, it will turn into a white dwarf.
694. The sun is made up of 99.9% hydrogen and helium.
695. The closest length to a yard is 1 meter.
696. The increasing vapor pressure caused by heating a liquid is due to increasing kinetic energy of molecules.
697. Molality is one of the ways of expressing the concentration of a solution that does not depend on temperature.
698. Equinox refers to equal duration of day and night.
699. A wind that reverses seasonally is known as the monsoon.
700. Gulf streams are caused by differences in water level.