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Option: B
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Option: B
Explanation :A bit (short for binary digit) is the smallest unit of data in a computer. A bit has a single binary value, either 0 or 1. Although computers usually provide instructions that can test and manipulate bits, they generally are designed to store data and execute instructions in bit multiples called bytes. In most computer systems, there are eight bits in a byte. The value of a bit is usually stored as either above or below a designated level of electrical charge in a single capacitor within a memory device.
Half a byte (four bits) is called a nibble. In some systems, the term octet is used for an eight-bit unit instead of byte. In many systems, four eight-bit bytes or octets form a 32-bit word. In such systems, instruction lengths are sometimes expressed as full-word (32 bits in length) or half-word (16 bits in length).

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Option: C
Explanation :A computer is capable of performing any task that can be Reduced to a series of logical steps.
In reality, computers are not very smart on their own. In order to perform all the tasks, humans fed a series of instructions into a computer that tells him how to behave and perform when faced a particular type of problem. Moreover, these series of instructions are known as a computer program or software. The process of feeding or storing instructions into the computer is known as computer programming. The person who knows how to write a computer program correctly is known as a programmer.
Most importantly computer can’t understand English, Urdu or any other common language. Computer have their own special languages, designed by computer scientists. Programmers write computer programs in these special languages called programming languages. Java, C, C++, C#, Python are some of the most commonly used programming languages. Therefore, computer is capable of performing any task that can be Reduced to a series of logical steps.

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Option: D
Explanation :The use of computer for business applications is attractive because computer have reliability, speed, secrete code facility, accuracy, validity, efficiently etc..

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Option: A
Explanation :Modern computer are compared to earlier computers by Faster and Smaller.

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Option: D
Explanation :A computer derives its basic strength from speed, reliability, accuracy, storage, versatility, consistency, communication, recalling, control sequence and cost reductions.

I. Speed:-

Computer processes data at a very high speed. It is much faster than human beings. A computer can perform billions of calculations in a second. Computer speed is measured in Mega Hertz (MHz) or Giga Hertz (GHz).

II. Reliability:-

Computer is very reliable because in modern computer electronic components rarely break or fail.

III. Accuracy:-

Accuracy means that the computer provides results without any errors. Computer can process large amounts of data and produce results accurately. Computer result can be wrong only if the data given is not correct.

IV. Storage/Memory:-

Computer can store a large amount of data permanently or temporarily. People can use permanently stored data at any time. For example a computer can store thousands of books easily.

V. Versatility:-

Computer is a versatile machine so it can perform different types of tasks. That is why it is being used in every field of life. Computer is used in hospital, bank, office, and at home etc.

VI. Consistency:-

Computer works in a consistent way. It does not lose concentration due to heavy work. In other words, computer does not become tired or bored.

VII. Communication:-

Computer have capability to communicate with other computers. Therefore, these computers can share data, instructions, and information.

VIII Recalling:-

A computer can recall the stored data and information as and when required. In addition, computer can recall the required data in a few seconds.

IX Cost Reduction:-

Computer can perform a difficult task in less time and less cost.
In short, a computer derives its basic strength from speed, reliability, accuracy, storage, versatility, consistency, communication, recalling, control sequence and cost reductions.

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Option: B
Explanation :A barometer is a scientific instrument used to measure atmospheric pressure, also called barometric pressure. The atmosphere is the layers of air wrapped around the Earth. That air has a weight and presses against everything it touches as gravity pulls it to Earth. Barometers measure this pressure.

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Option: C
Explanation :Evangelista Torricelli was an Italian physicist and mathematician, best known for his invention of the barometer, but is also known for his advances in optics and work on the method of indivisibles.

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Option: A
Explanation :The man who discovered some of the human blood types that we know today was an Austrian, Karl Landsteiner. His work was influenced by an article on blood typing in goats, which was written by Paul Ehrlich and appeared in the ‘Berliner klinische Wechenschrift’ in 1900.
Landsteiner discovered the common blood types A, B and O (which he referred to as A, B and C) in 1901, and Adriano Sturli and Alfred von Decastello – who were working under Landsteiner – discovered type AB a year later in 1902. Landsteiner was awarded the 1930 Nobel Prize in Physiology or Medicine for his work.

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Option: D
Explanation :Dr. Hans von Ohain and Sir Frank Whittle are both recognized as being the co-inventors of the jet engine as we know it today, even though each worked separately and knew nothing of the other’s work.
While Von Ohain is considered the designer of the first operational turbojet engine, Whittle was first to register a patent for his schematics of a prototype, in 1930. Von Ohain obtained a patent for his prototype in 1936, and his jet was the first to fly in 1939. Whittle’s took off for the first time in 1941. While von Ohain and Whittle may be the acknowledged fathers of modern jet engines,

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