Puzzle 1: How many times in a day, the hands of a clock are straight? A. 22 B. 44 C. 24 D. 48 Answer: 44 Explanation: In 12 hours, the hands coincide or are in opposite direction 22 times. In 24 hours, the hands coincide or are in opposite direction 44 times Read more about Clock Puzzle 3 (With Answers)[…]
Crystal structures are studied by x-ray diffraction method. It is due to the interatomic differences and interplanar distances in a crystal are in the range of wavelength of x-rays. Only in the case of x-rays diffraction is possible. Path difference = BC + CD = AC sinθ + AC sinθ = d sinθ + d Read more about Bragg’s Equation[…]
Puzzle 1: How many times in a day, the hands of a clock are straight? A. 22 B. 44 C. 24 D. 48 Puzzle 2: At 3.40, the hour hand and the minute hand of a clock form an angle of? A. 120° B. 130° C. 125° D. Read more about Clock Puzzle 3[…]
There are two main types of thermodynamic processes: the reversible and irreversible. The reversible process is the ideal process which never occurs, while the irreversible process is the natural process that is commonly found in the nature. Introduction: When the system undergoes a change from its initial state to the final state, the system is Read more about Reversible and Irreversible Processes[…]
Teaser 1: If an electric train is going east at 60 miles an hour and there is a strong westerly wind, which way does the smoke from the train drift? Answer: There is no smoke coming from electric trains. Teaser 2: Say Race car backwards. Answer: ‘Race car backwards’ Teaser 3: What do the numbers 11, 69, and 88 all Read more about Brain Teaser 6 [With Answers][…]
Various methods of evaluations of algebraic limits: To evaluate algebraic limits, we have the following methods: i. Direct substitution method ii. Factorization method iii. Rationalisation method iv. Using some standard results v. Method of evaluating limits when variable tends to ∞ or – ∞ Direct substitution method: If by direct substitution of the point in Read more about Evaluation and Algebric of Limits – I[…]
Teaser 1: If an electric train is going east at 60 miles an hour and there is a strong westerly wind, which way does the smoke from the train drift? Teaser 2: Say Race car backwards. Teaser 3: What do the numbers 11, 69, and 88 all have in common? Teaser 4: How can you throw a ball as Read more about Brain Teaser 6[…]
Defects in Non-Stoichiometric Compounds: The compounds in which the ratio between numbers of anions to number of anions is not equal to ratio indicated by the formula. Metal Excess Defect Metal Deficiency Defect. a. Metal Excess Defect: In these compounds there is an excess of cations along with the electrons occurs. 1. Anion Vacancy: ⇒ Read more about Imperfections in Solids – I[…]
Puzzle-1: Where should the hour hand point to on the bottom clock?Answer: Hour hand is pointing to 2. Explanation: Multiply the hour hand value by 2 and add the minute hand value. This total is always 15. Puzzle-2: What time should the bottom clock show?Answer: Five minutes to ten Explanation: Start with the top left clock face, and move around the Read more about Clock Puzzle 2 (With Answers)[…]
We can now resolve a vector A in terms of component vectors that lie along unit vectors î and ĵ. Consider a vector A that lies in x – y plane as shown in figure. We draw lines from the head of A perpendicular to the coordinate axes as in figure and get vectors A1 Read more about Motion in a Plane[…]