PG TRB COMPUTER INSTRUCTOR GRADE 1 STUDY MATERIAL - 09

1. 2’s complement of binary number 0101 is ...........

 A.  1011

B.  1111

C.  1101

 D.  1110

2. An OR gate has 4 inputs. One input is high and the other three are low. The output is .......

A.  Low

B.  High

C.  alternately high and low

D.  may be high or low depending on relative magnitude of inputs

3. Decimal number 10 is equal to binary number ...............

A.  1110

B.  1010

C.  1001

D.  1000

4. Both OR and AND gates can have only two in

A.  True

B.  False

C.  else other

D.  None of these

5. A device which converts BCD to seven segments is called ........

A.  Encoder

B.  Decoder

C.  Multiplexer

D.  None of these

6. In 2’s complement representation the number 11100101 represents the decimal number ............

A.  +37

B.  -31

C.  +27

D.  -27

7. A decade counter skips ...........

A.  binary states 1000 to 1111

B.  binary states 0000 to 0011

C.  binary states 1010 to 1111

D.  binary states 1111 to higher

8. BCD input 1000 is fed to a 7 segment display through a BCD to 7 segment decoder/driver. The segments which will lit up are .............

A.  a, b, d

B.  a, b, c

C.  all

D.  a, b, g, c, d

9. A ring counter with 5 flip flops will have .......... states.

A.  5

B.  10

C.  32

D.  Infinite

10. In the expression A + BC, the total number of minterms will be .........

A.  2

B.  3

C.  4

D.  5

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