Answer: B) 21st September Explanation: "National Volunteer Day" & "International Peace Day" are observed on 21st september every year.

Answer: B) Sunil Arora Explanation:

Answer: B) Mass Explanation: Mass means the amount of matter in an object. Anything that has Mass and takes up Space is called Matter.   The Study of Matter and and how matter changes is called Chemistry.   Matter has some mass and occupies some space. Space occupied by an object is called its Volume.

Answer: B) Father & Daughter Explanation:

Answer: A) Retinol Explanation: Vitamin A is a group of unsaturated nutritional organic compounds that includes retinol, retinal, retinoic acid, and several provitamin A carotenoids. IUPAC Name :: (2E,4E,6E,8E)-3,7-dimethyl-9-(2,6,6-trimethylcyclohexen-1-yl)nona-2,4,6,8-tetraen-1-ol   Vitamin Name - Chemical Name Vitamin A   -     Retinol Vitamin B1  -    Thiamine Vitamin B2  -    Riboflavin Vitamin B3  -    Niacin Vitamin B5  -    Pantothenic acid Vitamin B6  -    Pyridoxin Vitamin B7  -    Biotin Vitamin B9  -    Folic acid Vitamin B12  -   Cyanocobalamin Vitamin C     -   Ascorbic acid Vitamin D     -   Calciferol Vitamin E      -   Tocoferol Vitamin K      -   Phylloquinone and Menaquinones

It has been said that the creation of NASA was due to the space exploration race between the US and the Soviet Union. One of the drives to the creation of NASA is the launching of Sputnik on October 4, 1957.   Since then, further explorations have been made by the agency.

Answer: C) Reproductive glands Explanation: Endocrine glands are glands of the endocrine system that secrete their products, hormones, directly into the blood rather than through a duct.   The major glands of the endocrine system include: pineal gland, pituitary gland, pancreas, ovaries, testes, thyroid gland, parathyroid gland, hypothalamus and adrenal glands.

Answer: C) 2.5 Explanation: Bond Order  = 1/2[ Nb - Na] where Nb = Number of electrons in bonding molecular orbitals. Na = Number of Electrons in antibonding molecular orbitals   Bond Order of N2⁺: Total number of electrons: 13 Electronic Configuration= :σ1s² σ*1s² σ2s² σ*2s² π 2py² [π2pz² σ2px1 ] Bond Order = [9-4]/2 = 5/2 = 2.5.