501. The contraction and expansion movement of the walls of the food pipe after entering the slightly digested food is known as Peristaltic movement.
502. A strong-smelling agent added to LPG cylinders to detect leakage is Ethyl Mercaptan.
503. The planet that is called the “red planet” is Mars.
504. The part of the brain that controls thirst and hunger is the Hypothalamus.
505. “Gastric juice” is a secretion of the glands present in the Stomach.
506. Among the following types of elements, Cadmium is not a radioactive element.
507. The type of lenses prescribed by doctors for a patient suffering from astigmatism is Cylindrical Lens.
508. A photometer is used for Measuring light Intensity.
509. The valency of a carbon atom is 4.
510. A ‘breath test’ used by traffic police to check drunken driving uses Potassium dichromate-sulphuric acid.
511. The absolute value of the charge on an electron was determined by Robert Millikan.
512. The temperature at which two conjugate solutions change into one homogeneous solution is called Azeotrope.
513. The gases used in different types of welding would include Oxygen and acetylene.
514. The expected number of RBCs in a single drop of blood is 4.0 to 5.2 million in Women.
515. Phonetics is the Study of speech sounds.
516. The part of the body attacked by “Gingivitis” disease is Gums.
517. In an Annular Solar Eclipse, the Sun’s center is covered by the moon, leaving its edges uncovered.
518. The disease beri beri is because of Lack of green vegetables in the diet.
519. The vector of Kala-azar disease is Sandfly.
520. Fathom is the unit of measurement for Depth.

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