 # Clock Puzzles 1

Puzzle – 1: What time should the last watch show?Puzzle – 2: Where should the hour hand point to on the bottom clock?Puzzle – 3: Where should the missing hour hand point to?Puzzle – 4: Where should the minute hand point to on the bottom clock?Puzzle – 5: Where should the minute hand point to on the bottom clock? Share Read more about Clock Puzzles 1[…] # Nomenclature of organic compounds: Naming Alkanes

These are saturated hydrocarbons i.e., contain all single C – C bonds and only C and H atoms. 1. Naming straight chain hydrocarbons: Prefix: indicates the number of carbons Suffix: ‘-ane’ 2. Branched chain alkanes: Identify the longest carbon chain Number the carbons in the parent carbon chain such that the substituents get minimum numbers If two Read more about Nomenclature of organic compounds: Naming Alkanes[…]

# Combination or Propagation of Errors

Generally, the result of an experiment is obtained by doing mathematical operations on several measurements. Obviously, the final error depends not only upon the errors in individual measurements but also on the nature of mathematical operations. Following are the rules for combination of errors. (a) Errors in a Sum or Difference: Let there be two Read more about Combination or Propagation of Errors[…] Riddle 1: What invention lets you look right through a wall? Answer: A window Riddle 2: What can you catch but not throw? Answer:  A cold Riddle 3: What is at the end of a rainbow? Answer:  ‘w’ Riddle 4: What is always coming but never arrives? Answer:  Tomorrow Riddle 5: Which weighs more, a pound of feathers or a pound of bricks? Answer:  Neither, they both weigh one pound Read more about Riddles 3 [With Answers][…] # Riddles 3

Riddle 1: What invention lets you look right through a wall? Riddle 2: What can you catch but not throw? Riddle 3: What is at the end of a rainbow? Riddle 4: What is always coming but never arrives? Riddle 5: Which weighs more, a pound of feathers or a pound of bricks? Share +1 Tweet View Email Print Follow # Centroid of Triangle & Centroid of Tetrahedron

Centroid of Triangle: The coordinates of the centroid of the triangle with vertices A (x1, y1, z1) B (x2, y2, z2) and C (x3, y3, z3) Proof: Let D be the mid-point of AC then coordinates of D are Let G be the centroid of ΔABCThen, G divides AD in the ratio 2:1 So, coordinate Read more about Centroid of Triangle & Centroid of Tetrahedron[…] # Math Puzzle 4 [With Answers]

Puzzle 1: Which number replaces the question mark?Answer: 45 Consider diagonally 15 + 15 = 30    35 + 5 = 40 30 + 15 = 45    40 + 5 = 45 60 + 15 = 75    50 + 5 = 55 Puzzle 2: Which number replaces the question mark? 3, 5, 13, 43, 177, ?, 5353 Answer: 891 3 Read more about Math Puzzle 4 [With Answers][…] # Nomenclature of organic compounds

Method of naming organic compounds developed by IUPAC (International Union of Pure and Applied Chemistry). It’s called IUPAC system of nomenclature. Naming the organic compounds: Identify the parent chain Identify the functional group Accordingly add prefixes or suffixes. So IUPAC name of any organic compounds essentially consists of two or three parts. (i)   Root Read more about Nomenclature of organic compounds[…]

# Absolute Error, Mean Absolute Error, Relative Error (Or Percentage Error)

a) Absolute error: Let a physical quantity A be measured n times and let A₁, A₂, … An be the results of these measurements. If Am is the arithmetic mean of these measurements, then Or … (1) Since the true value of the quantity is now known, we usually take Am to be the true Read more about Absolute Error, Mean Absolute Error, Relative Error (Or Percentage Error)[…] # Math Puzzle 4

Puzzle 1: Which number replaces the question mark?Puzzle 2: Which number replaces the question mark? 3, 5, 13, 43, 177, ?, 5353 Puzzle 3: Which number replaces the question mark?Puzzle 4: Which number replaces the question mark? If 2 + 3 = 8 3 + 7 = 27 4 + 5 = 32 5 + 8 = 60 6 Read more about Math Puzzle 4[…]