class 9 sainik school maths ch 1 number system extra questions

To judge the preparation of students of class IX on topic (Number system) Mathematics teachers write two numbers on blackboard and ask some questions about the two numbers, which are following, the answer the questions.Write the   form of

Which of the following is not a positional number system?*

(A B C D E F) ARE FOUND IN WHICH TYPE OF NUMBER SYSTEM

In decimal system there are 10 digits 0, 1, 2, 3, . . . till 9. Similarly, there is a system which has only 3 digits 0, 1 and 2. Numbers represented in such systems are called base 3 or trinary numbers. A = 389 + 1  is a number in the decimal system. B is the trinaryequivalent of this number. How many zeros are there in B ?

5.  The following are elements of a mathematical system EXCEPT?