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“The Knowledge Library”
Knowledge for All, without Barriers…
An Initiative by: Kausik Chakraborty.
“The Knowledge Library”
Knowledge for All, without Barriers……….
Knowledge for All, without Barriers…
Paper – III (Technology, Economic Development, Bio-diversity, Environment, Security and Disaster Management) Biotechnology is distinguished and developing sciences in modern scientific world. It elucidates the newest pattern of scientific advances which focus at deriving valuable products for human race through …
Paper – III (Technology, Economic Development, Bio-diversity, Environment, Security and Disaster Management) Space is increasingly considered as a catalyst for economic growth, social wellbeing and sustainable development. Space knowledge is a basic tool for technology-based planning and decision making. Space …
Paper – III (Technology, Economic Development, Bio-diversity, Environment, Security and Disaster Management) The field of robotics is the outcome of scientific research and development. Roboticists develop man-made motorized devices that can move by themselves, whose motion must be modelled, planned, …
Suppose point A से एक कार X km/hr के speed से point B की ओर जा रहा है एवं point B से एक कार Y Km/hr की स्पीड से point A की और आ रहा है तो दोनों कार एक- …
(Q1)A train passes two persons walking in the same direction at a speed of 3 km/hour and 5 km/hour respectively in 10 seconds and 11 seconds respectively. The speed of the train is. एक रेलगाड़ी अपनी ही दिशा में क्रमशः …
⇒Suppose A and B are two objects and their speeds are respectively S1 and S2 moving in the same direction ⇒suppose A and B are two objects and their speeds are respectively S1 and S2 moving in opposite direction Time …
(Q1)Aman when increasing his speed from 24 km/hr to 30 km/hr. He takes 1 hour less than the usual time to cover a certain distance. what is distance usually covered by Aman? जब अमन अपनी चाल को 24 km/hr से …
(Q1)A boy goes to his school from his house at a speed of 3 km/hr and returns at a speed of 2 km/hr. if he takes 5 hours in going and coming, then the distance between his house and school …
Important time, speed and distance formula Time And Distance Concepts and shortcut Type-1 (Q1)Sriya with her family travelled from Bolpur to Suri by car at a speed of 40 km/hr and returned to Bolpur at a speed of 50 km/hr.The …
(Q) There are 480 coins in half rupees, quarter rupees and 10 paise coins and their values are proportional to 5:3:1. The number of coins in each case are. 50 पैसे, 25 पैसे और 10 पैसे के कुल 480 सिक्के …
(Q)A can contains a mixture of two liquids A and B in the ratio 7:5. When 9 liters of mixture are drained off and the can is filled with B, the ratio of A and B becomes 7:9. How many …
(Q)A mixture contains milk and water in the ratio 5:2 on adding 22 litres of water, the ratio of milk and water becomes 7:5. The quantity of water in the original mixture is. एक मिश्रण में दूध व पानी का …
(Q1)The product of two positive integers is 1575 and their ratio is 9:7. The smaller integer is. दो संख्याओं का गुणनफल 1575 है और उनका अनुपात 9:7 है तो छोटी संख्या ज्ञात करें| Solution: Let the integers be 9x and …
Ratio And Proportion Concept Ratio – It is a way of comparing two numbers or quantities and showing the relationship between them. It is denoted by → ‘:’ Ex: In a class, there are 60 boys and 40 girls. What is the ratio of …
For Example: (Q1)Successive discounts of 30% and 20% are equivalent to a single discount of. Solution: =44% Ans. (Q2)A single discount equivalent to the successive discounts of 10%, 20%, and 25% is. Solution: =28% Now, =46% Ans. (Q3)The difference between …
(Q) A dealer sells goods at 6% loss but uses 14g instead of 16g. What is his percentage profit or loss? Solution: Let C.P of shopkeeper for 1g=Rs 1 C.P of shopkeeper for 16g=Rs 16 False C.P of shopkeeper for 14g=Rs 14 % …
(Q)Profit earned by selling an article for Rs 1060 is 20% more than the loss incurred by selling the article for Rs 950. At what price should the article be sold to earn 20% profit? Solution: By Concept Let C.P=x Profit=1060-x …
(Q)The total cost price of two watches is Rs 840. One is sold at a profit of 16% and the other at a loss of 12%. There is no loss or gain in the whole transition. Then their cost price …