# TRB

### ஓரெழுத்து ஒரு மொழி சொற்கள்

ஒரெழுத்து ஒரு மொழி என்பது ஒரே ஒரு எழுத்தானது ஒரு சொல்லாக வந்து பொருள் தருவது ஆகும். ஒரே ஒரு எழுத்து மட்டும் தனித்து வந்து ஒரு பொருளைக் குறிக்குமானால் அதற்கு ஓரெழுத்து ஒரு மொழிச் சொல் என்று பெயர். உதாரணம்: தை.. இந்த “தை” என்ற எழுத்தானது தமிழ்மாதங்களில் ஒன்றான மாதத்தின் பெயரைக் குறிக்கும் எழுத்தாகும். இதே எழுத்து “தைத்தல்” “பொருத்துதல்” என்ற பொருளிலும் வரும். இவ்வாறு ஒரே […]

### First Freedom Struggle -History-TNPSC,TNTET,RRB,SSC,GOVT JOBS EXAM

The 1857 Revolt • According to P.E. Roberts, “The Revolt of 1857 was just a sepoy mutiny and it arose due to cartridges with fats.” • According to V.D. Savarkar, “The Revolt of 1857 was the first war of India’s independence, the great rebellion, the Indian mutiny. • The Revolt […]

### SIMPLE INTEREST -IMPORTANT FORMULA

Principal: The money borrowed or lent out for a certain period is called the principal of the sum. Interest: Extra money paid for using other’s money is called interest. Simple Interest (S.I.): If the interest on a sum borrowed for a certain period is reckoned uniformly, then it is called […]

### PROBLEMS ON TRAINS ->IMPORTANT FORMULA

a km/hr = [a * 5/18]m/s. a m/s = [a * 18/5] km/hr. Time taken by a train of length l metres to pass a pole or a standing man or a signal post is equal to the time taken by the train to cover l metres. Time taken by […]

### PARTNERSHIP -> IMPORTANT FACTS AND FORMULA

I. Partnership: When two or more than two persons run a business jointly, they are called partners and the deal is known as partnership. II. Ratio of Division of Gains: (i) When investments of all the partners are for the same time, the gain or loss is distributed among the […]

### BOATS AND STREAMS -> IMPORTANT FACTS AND FORMULA

I. In water, the direction along the stream is called downstream. And, the direction against the stream is called upstream. II. If the speed of a boat in still water is u km/hr and the speed of the stream is v km/hr, then: Speed downstream = (u + v) km/hr […]

### VOLUME AND SURFACE AREA -IMPORTANT FACTS AND FORMULA

I. CUBIOD Let length = l, breadth = b and height = h units. Then, Volume = (l x b x h) cubic units. Surface area = 2 (lb + bh + lh) II. CUBE Let each edge of a cube be of length a. Then, Volume = a³ cubic […]

### PROFIT AND LOSS -IMPORTANT FACTS AND FORMULA

Cost Price: The price, at which an article is purchased, is called its cost price, abbreviated as C.P. Selling Price: The price at which an article is sold, is called its Selling Price, abbreviated as S.P. Profit or Gain: If S.P. is greater than C.P., the seller is said to […]