Puzzle 1: Which number replaces the question mark?Puzzle 2: Which symbol replaces the question mark?Puzzle 3: Which grid replaces the question mark?Puzzle 4: Which grid replaces the question mark?Puzzle 5: Which grid replaces the question mark? Share Tweet View Email Print Follow
Quantitative analysis is the determination of the absolute or relative abundance (often expressed as a concentration) of one, several or all particular substance(s) present in a sample. 1. Carbon and Hydrogen: Liebig’s combustion method: A known weight of organic compound is heated with pure and dry cupric oxide in a steam of pure and dry oxygen, Read more about Quantitative Analysis[…]
Gravitational Filed: The space surrounding a material body in which its gravitational force of attraction can be experienced is called its gravitational field. Gravitational Filed Intensity: Gravitational filed intensity at any point is defined as the gravitational force experienced by any test mass divided by the magnitude of test mass when placed at desired point. Read more about Gravitational Filed and Potential[…]
Answers for the previous puzzles Puzzle – 1: How many triangles and quadrilaterals are there in this diagram?Answer: 64 Triangles 36 Quadrilaterals Total: 100 shapes. Puzzle – 2: Eight squares of paper, all exactly the same size, have been placed on top of each other so that they overlap as shown:In what order were the Read more about Riddles – 2 [With Answers][…]
Puzzle – 1: How many triangles and quadrilaterals are there in this diagram?Puzzle – 2: Eight squares of paper, all exactly the same size, have been placed on top of each other so that they overlap as shown:In what order were the sheets placed? Puzzle – 3: Several people of different ages brought things for Read more about Riddles – 2[…]
Equation of the Bisectors: The bisectors of the angle between two straight lines a1x + b1y + c1 = 0 and a2x + b2y + c2 = 0 are the locus of a point which is equidistant from the two lines. So let P (h, k) be a point equidistant from the two lines. Then, Read more about Equations of the Bisectors of the Angle between Lines[…]
• Acid rains occur due to presence of oxides of nitrogen & Sulphur in rain water. • Nitric acid & sulphuric acid in the atmosphere dissolve in rain water and come down to earth as acid rain. • The rain water which contains nitric acid and sulphuric acid is called acid rain. • Acid rain Read more about Acid rains[…]
The satellite which appears stationary relative to earth is called geostationary or geosynchronous satellite, communication satellite. A geostationary satellite always stays over the same place above the earth such a satellite is never at rest. Such a satellite appears stationary due to its zero relative velocity w.r.t. that place on earth.The orbit of a geostationary Read more about Geostationary Satellite[…]
The length of the perpendicular from a point (x₁, y₁) to a line ax + by + c = 0 is . The length of the perpendicular from the origin to the line ax + by + c = 0 is . Example: If P is the length of the perpendicular from the origin to Read more about Distance of a Point from a Line[…]
Green House effect: The trapping of the sun’s warmth in a planet’s lower atmosphere, due to the greater transparency of the atmosphere to visible radiation from the sun than to infrared radiation emitted from the planet’s surface. Global warming: Global Warming is the increase of Earth’s average surface temperature due to effect of greenhouse gases, such Read more about Green House Effect & Global Warming[…]