Answer: D) Ar Explanation: Argon is most the most abundant Rare Gas in the atmosphere. Its elemental symbol is Ar.

Answer: A) liquid dispersed in gas Explanation: Fog is an example of a colloidal system liquid dispersed in gas.

Answer: A) Insects Explanation: Entomology is the science branch of Zoology that studies Insects.

Answer: C) Seed Explanation: Lightning produces thunder just as a seed will eventually produce a grape.

Answer: B) 3 Explanation: Nitrogen (N2) forms Three Covalent Bonds to become stable.   Here the Atmomic Number of Nitrogen is 7. Because there are 2 electrons in the first orbital and 5 in the second and you still have space for 3 more. So it shares, 3 to get the stable octet. Therefore, there are 3 covalent bonds in N2.

Answer: D) 41 Explanation: We can get this by any of two explanations.   Answer 1: 41 7 = 3 + 4  = 34 Similarly, 5 = 4 + 1  = 41   Answer 2 :  41 7 - 3 = 4  => 34 Similarly, 5 - 4 = 1  => 41

Answer: D) Both B & C Explanation: Galileo Galilei (1564-1642) was an Italian Astronomer who        1) Discovered 4 satellites of Jupiter 2) Developed Telescope   3) Discovered that the movement of pendulum produces a regular time measurement He is Physicist, Mathematician, inventor, and philosopher Too.

Answer: A) 36 Explanation:   LCD is nothing but Lowest or Least Common Denominator   Here LCD of 12 and 18 means LCD of two fractions with denominators 12 and 18 respectively.   Therefore, LCM of 12 & 18 = 6 x 3 x 2 = 36     How to calculate LCD :: The lowest common denominator or least common denominator (LCD) is the least common multiple (LCM) of the denominators of a set of fractions.