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Sunday, August 3, 2014

MOTHERBOARD

What is motherboard ? 
Or
Short Note on motherboard.

Answer:-

1)Motherboard specifically refers to a printed circuit board(PCB) with expansion capability and as the name suggests, this board is the "mother" of all components attached to it, which often include sound cards, video cards, network cards, hard drives, or other forms of persistent storage; TV tuner cards, cards providing extra USB or FireWire slots and a variety of other custom components .

2)It is the main circuit board in a computer.

3)A motherboard provides a way for hardware in a computer to communicate with each other.

4)The term mainboard is applied to devices with a single board and no additional expansions or capability, such as controlling boards in televisions, washing machines and other embedded systems.

5)An important component of a motherboard is the microprocessor's supporting chipset, which provides the supporting interfaces between the CPU and the various buses and external components. This chipset determines, to an extent, the features and capabilities of the motherboard.

6)It holds many of the crucial electronic components of the system, such as the central processing unit (CPU) and memory, and provides connectors for other peripherals.

7)Motherboards contain some non-volatile memory to initialize the system and load some start up software, usually an operating system, from some external peripheral device.






                                                           Figure :- Motherboard

Saturday, August 2, 2014

Solve sums of arithmetic



1. Find the smallest number which when diminished by 3,is exactly divisible by 21,28,36 and 45.

  Answer:-   1263  


2.If we multiply a fraction by itself and divide the product by its reciprocal , we get 1826/27. Find the original fraction.

Answer :-   2  2   
                       3



3. By what least number must 21,600 be multiplied to make it a perfect cube?

Answer :-  10


4.Solve
  0.5 * 0.05 * 0.005 * 50

Answer:-  0.006250


5. The value of a machine depreciates at the rate 10% every year. It was purchased 3 years ago.If its present value is Rs 8,748 , find its purchase price.

Answer :-  Rs 12,000



6. On a journey across Delhi , a taxi averages 30 kmph for 60% of the distance,20kmph for 20% of it and 10 kmph for the remainder. Find the average speed for the whole journey.

Answer:-  20 km per hr


7. A mixture contains alcohol and water in the ratio of 4:3 .If  7 litres of water is added to the mixture, the ratio of alcohol and water becomes 3:4 . Find the quantity of alcohol in the mixture.

Answer:-  12 litres


8. A and B can do a piece of work in 12 days, B and C in 15 days,C and A in 20 days.In how many days A alone will do the work?

Answer:-  30 days


9. At a certain rate of simple interest, a certain sum doubles itself on 10 years,it will treble itself?

Answer:-  20 years



10. If the ratio of the areas of two squares is 9:1 ,then what will be the ratio of their parameters?

Answer:-  3:1


11. If a commission of 10% is given on the written price of an article ,the gain is 20 % .Find the gain percent if the commission is increased to 20 %.

Answer:-  6  2 %
                     3



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