Question Discussion & Solution

Concept:

In magnetic compass, a magnetic needle which always directs the North-South direction.

• The compass is an instrument used for navigation and orientation that indicates position relative to the geographical directions (or points).
• Typically, a diagram called a compass rose displays the directions to the north, south, east, and west on the compass face.

Elements of Earth's Magnetic Field:

• The magnitude and direction of the magnetic field of the earth at a place are completely given by certain quantities known as magnetic elements.

Explanation:

Earth has its own magnetic field whose poles are

• Magnetic North is in Geographical South pole.
• Magnetic South is in Geographical North Pole.
• A compass needle is a bar magnet with a pointed north pole. It is attracted to the magnetic south pole.
• Hence magnetic needle points in North Direction (Magnetic South). 

Concept:

• Electric current is the rate of flow electric charge or free Electrons in a definite direction through any section of wire. Its SI unit is ampere(A).
• The direction of the conventional current corresponds to the direction of positive charge which is from higher potential(positive) to lower potential(negative).

I = Q / t

I is current, Q is charge, t is time

Explanation:

Q = I t

So Charge is the product of current and time.

Unit of current is Ampere, and unit of time is an hour. 

So, Amount of charge or Quantity of electricity is Ampere-hour 

• In 1837, Charles Babbage proposed the first general mechanical computer, the Analytical Engine; The Analytical Engine contained an ALU (Arithmetic Logic Unit), basic flow control, punch cards, and integrated memory
• Charles Babbage is credited with inventing the first mechanical computer that eventually led to more complex electronic designs, though all the essential ideas of modern computers are to be found in Babbage's analytical engine; Hence regarded as the father of computer science
• Blaise Pascal (1623 – 1662) was a French mathematician, physicist, inventor, writer and Catholic theologian
• John Napier (1550 – 1617) was a Scottish landowner known as a mathematician, physicist, and astronomer; He is best known as the discoverer of logarithms

The correct answer is EEPROM.

Key Points

• Flash memory is a non-volatile computer storage chip,
• It is made up of EEPROM.
• EEPROM is the acronym of electrically erasable programmable read-only memory,
• EEPROM is a Programmable ROM that can be erased and reprogrammed using an electrical charge.
• It was first was developed by George Perlegos.
• It allows the user to update the computer BIOS without having to open the computer or remove any chips.
• It organized as arrays of floating-gate transistors.
• USB flash drive, Memory cards are the examples of flash memory storage.
• BIOS is stored in Flash memory chip.

Additional Information

• RDRAM is the acronym of Rambus Dynamic Random Access Memory.
  • It is a video RAM.
• MROM is the acronym of Mask ROM.
  • It is produced by arranging transistors before the semiconductor manufacturing process actually begins.
• SRAM is the acronym of Static random-access memory
  • It uses latching circuitry (flip-flop) to store each bit.
• PROM is the acronym of Programmable Read-Only Memory.
  • It can be modified only once by a user.