9th Class Computer Chapter 2 Binary System Short Questions Answer
9th Class Computer Chapter 2 Binary System Short Questions Answer
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A set of values used to represent different quantities is known as number system. For example, a number system can be used to represent the number of students in a class.
A computer understands the language of 1s and 0s only called machine language.
The digital computer represents all types of data in binary numbers. It includes audio, graphics, video, text and numbers.
The number of digits used in any number system defines its base or radix. For example, base of decimal systems is 10 because it uses digits 0 to 9. Similarly the base of binary system is 2 because it uses digits 0 and 1.
Three types of number systems are decimal number system, binary number system and hexadecimal number system.
Decimal number system is commonly used in our daily life. Its base is 10 and it consists of ten digits from O to 9. These digits can be used to represent any numeric value.
Binary number system consists of two digits 0 and 1 and its base is 2. Each digit or bit in binary number system can be 0 or 1. The position of each digit in binary number system represents a power of base 2.
Hexadecimal number system consists of 16 digits from 0 to 9 and A to F. The alphabets A to F represent decimal numbers from 10 to 15. The base of this number system is 16.
Computer memory is a physical device that can store data. The two types of computer memory are volatile memory and non-volatile memory.
Volatile memory is a device that can store data as long as the power supply is connected to it. The contents of volatile memory are lost as the power supply is disconnected. Random Access Memory (RAM) is an example of volatile memory.
Non-volatile memory is a device that stores data even if the power supply is not connected to it. Hard drive, flash drive and memory cards are examples of non-volatile memory. It is also known as secondary storage.
Memory stores data temporarily but storage stores it permanently. Memory has high speed than storage. The capacity of memory is typically smaller than storage.
The digital computers store data in binary form. Different types of data such as text, picture, video or applications are stored in the form of Os and Is. All characters on the keyboard as associated with the codes known as ASCII code. It is a standard used to represent data in computer memory.
ASCII stands for American Standard Code for Information Interchange. It is a standard used to represent data in computer memory.
The ASCII code for 1 is 49. The ASCII code for + is 43. The ASCII code for @ is 64.
Storage devices are used to store data and programs permanently. These devices are non-volatile and retain the contents even if the power is turned off.
Some examples of commonly used secondary storage devices are hard disks, optical discs (CDs/DVDs). USB flash drives and memory cards.
Boolean algebra is the algebra of logic. It uses binary values so it is also known as binary algebra or logical · algebra. Boolean algebra is used in the designing of logic circuits in computer. These circuits perform different logical operations.
A Boolean proposition is a sentence that can be true or false. For example, the sentence “Are you a student?” is a proposition because its result, is true or false. However, the sentence “What is your address?” is not a proposition because its result is not in the form of true or false.
The AND operator is used to connect two or more propositions. The compound Boolean proposition is true if all connected propositions are true. Its result is false result if any proposition is false. It can be denoted by a dot (.).
The OR operator is used to connect two or more propositions. The compound Boolean proposition is true if any connected proposition is true. Its result is false result if all propositions are false. It can be denoted by a plus (+).
A truth table is used to check whether a proposition is true or false. It is typically used to check the truth value of a proposition in which logical operators are used.
The commutative law states that the order of application of two separate propositions is not important. It means that the order is which two variables in a Boolean expression are calculated does not change its result.
The distributive law is the most important law in Boolean algebra. It involves in two operators AND and OR.
The identity law works with two operators AND and OR. It states that a variable OR’ed with O (False) is always equal to that variable. Similarly, a variable AND’ed with 1 (True) is always equal to that.
