# Number Systems – Exercise – 1

Exercise – 1

1. How many bytes are there in :

1111 1011 0111 0100 1010

(a)  2
(b)  3
(c)  2½
(d)  3½

Explanation
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2. In computers, subtraction is generally carried out by :

(a)  9’s complement
(b)  10’s complement
(c)  1’s complement
(d)  2’s complement

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3. An 8-bit LED display is shown in figure below. A white circle means that a LED in ON (binary 1) and a red circle means a LED is OFF (binary 0). What is the decimal equivalent of the binary number displayed ?

(a)  99
(b)  44
(c)  22
(d)  72
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4. The number of bits needed to encode all letters(26), symbols(10) and all numerals(10) is :

(a)  4
(b)  5
(c)  6
(d)  7

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5. What is the octal equivalent of the binary number :
10111101

(a)  675
(b)  275
(c)  572
(d)  573

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