 # Math Puzzles – 3 [With Answers]

Puzzle – 1: ( ) + ( ) + ( ) + ( ) + ( ) = 30 This is what you have for equation. The following are the numbers that you can use to fill in the brackets: 1, 3, 5, 7, 9, 11, 13 and 15 You can repeat the numbers if Read more about Math Puzzles – 3 [With Answers][…] # Angle between Two Intersecting Lines

Let v = a1 + λb1 and v = a2 + λb2 be the equations of two straight lines. If θ is the angle between them, then cos θ = , Also if θ is the angle between and , Then .Condition of perpendicularity: The lines are perpendicular, if b1 – b2 = 0 or Read more about Angle between Two Intersecting Lines[…] # Methods of Preparation of Acetylene

Preparation methods 1. From calcium carbide: Ethyne is prepared by calcium carbide with water. CaC₂ + 2H₂O → Ca (OH)₂ + C₂H₂ 2. From vicinal dihalides: Vicinal dihalides on treatment with alcoholic potassium hydroxide undergo, dehydrohalogenation one molecule of hydrogen is eliminated to form alkenyl halide which on treatment with sodalime gives alkyne. Some Other General Methods Read more about Methods of Preparation of Acetylene[…] # NEET: NO SEPARATE ENTRANCE FOR MEDICAL COURSE EXCEPT ENGINEERING IN KERALA

The Kerala Government on December 20,2016 decided not to conduct separate entrance examinations by the state for medical and other professional courses except engineering from next academic year. The students would instead be admitted to medical, agricultural, AYUSH, veterinary sciences from the rank list published by National Eligibility cum Entrance Test (NEET), conducted by CBSE. Read more about NEET: NO SEPARATE ENTRANCE FOR MEDICAL COURSE EXCEPT ENGINEERING IN KERALA[…] # Precision, Accuracy & Errors in Measurement

Precision: All measurements, even when carried out with the utmost precision and care, involve errors. These errors may be associated with technical difficulties (the imperfection of the measuring instruments, the limited possibilities of the human eye, which in many cases takes readings of instruments etc.) and with numerous factors that are difficult or impossible to Read more about Precision, Accuracy & Errors in Measurement[…] Q1: Imagine you’re in a room that is filling with water. There are no windows or doors. How do you get out? Answer: Stop imagining. Q2: The more you take, the more you leave behind. What are they? Answer: Footprints. Q3: What two keys can’t open any door? Answer: A monkey and a donkey. Q4: Jimmy’s mother had four children. She named Read more about Riddle 2 (With Answers)[…] # Math Puzzles 2 (With Answers)

Puzzle 1: Which number replaces the question mark?Answer: 6 Puzzle 2: Which number replaces the question mark?Answer: 20 Puzzle 3: Which number replaces the question mark? If 1 =3 2 = 6 3 = 9 4 = 12 Then, 5 = ? Answer: 15 Puzzle 4: Which number replaces the question mark? 11 x 11 = 4 22 x 22 = 16 33 Read more about Math Puzzles 2 (With Answers)[…] # Direction ratios

Let l, m, n be direction cosines of a line and a, b, c be three numbers such that . Then we say that the direction ratios of the line are proportional to a, b, c. If ⅔, – ⅔, ⅓ are direction cosines of a line, then its direction ratios are proportional to 2, Read more about Direction ratios[…] # Math Puzzles 2

Puzzle 1: Which number replaces the question mark?Puzzle 2: Which number replaces the question mark?Puzzle 3: Which number replaces the question mark? If 1 =3 2 = 6 3 = 9 4 = 12 Then, 5 = ? Puzzle 4: Which number replaces the question mark? 11 x 11 = 4 22 x 22 = 16 33 x 33 = Read more about Math Puzzles 2[…]