ANSWER KEY OF BOOK WORK CLASS VII CH Number Sytem BACK ...

? ANSWER KEY OF BOOK WORK

CLASS ? VII CH ? 2

Number Sytem BACK EXERCISES (Pages:- 26-27)

? Part-1

A. Fill in the blanks : (page-26) 1. The base of binary number system is 2. 2. The base of decimal system is 10. 3. Octal number system consist of 8 digits. 4. In binary addition, 1+ 1 equals to 10. 5. Binary number system is understood by the computer

system. 6. Hexadecimal uses 16 symbols to represent numbers. 7. In binary subtraction , 1 ? 1 equals 0.

B. State True / False: (page-26) 1.You cannot perform arithmetical operation on binary numbers. False (can) 2.The decimal number system consists of 10 digits i. e. 0 to 9 . True 3.The method to perform division of two binary numbers is not same as that of decimal numbers. False(is same) 4. 1 multiplied by 0 equals to 0. True 5.Charles Babbage introduced the concept of 0 (Zero). False(Aryabhatta) 6.The numbers used in Octal number system are 1 to 7. False(0 to7)

C. Application based questions: (page-26)

1. Ratika's computer teacher asked her to convert the Octal number to Decimal number. Suggest her the method which she should apply in converting the Octal number.

Ans- 1. Multiply each binary number with 8 having the power 0.

2. Increase the power one by one, keeping the base fixed as 8.

3. Calculate the sum of all products. 2. The teacher has given an assignment to Saurabh on Binary

subtraction. Saurabh is confused how to subtract 1 from 0. Help him in solving the problem.

Ans- He has to take borrow from next digit for subtracting 1 from 0. for eg:- (10-1=1)

D. Multiple choice questions: (page-26) 1.Aryabhat introduced the concept of 0 (Zero).

a. Ada Lovelace b. Aryabhat c. Bill Gates

2.Digital computer converts the decimal format into its Binary equivalent.

a. Digital Computer b. Cell Phone c. Abacus

3.A computer understand only binary language.

a. English

b. French

c. Binary

4.In binary multiplication , 1*1 equals to 1

a. 0

b. 1

c. 2

5.To convert Decimal number into Binary number, divide the number by 2

a. 2

b. 4

c. 8

E. Answer the following: (page-27) Que- 1. Explain number system and its commonly used types.

Ans- A number system is a set of values used to represent different quantities.

Different types of number system are:

1. Decimal number system 2. Binary number system 3. Octal number system 4. Hexadecimal number system

Que-2. What are the rules to convert a Decimal number to Binary number.

Ans- 1. Divide the given decimal number with the base 2.

2. Write down the remainder and divide the quotient again by 2. 3. Repeat the step 2 till the quotient is zero.

Que-3. Write the rules to multiply two Binary numbers.

Que-4. Briefly explain the Octal number system.

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