# Number Systems – 1 – 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

Explanation
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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

Explanation
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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

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

(a) 675
(b) 275
(c) 572
(d) 573