To convert an octal number to its binary equivalent, each octal digit is expressed as

1. 3 bits form
2. 4 bits form
3. 8 bits form
4. All of them

Sixteen raised to the power zero (16⁰) is equivalent to

1. 0
2. 1
3. 0 and 1
4. None

The base of a hexa-decimal number is represented by

1. H16
2. 16
3. 15
4. None

In a hexa-decimal number system, 'B' represents the digit

1. 11
2. 12
3. 14
4. 13