PG TRB COMPUTER INSTRUCTOR GRADE 1 STUDY MATERIAL - 06

1.The decimal equivalent of (1100)2 is

A.  12

B.  16

C.  18

D.  20

2. The binary equivalent of (FA)16 is

A.  1010 1111

B.  1111 1010

C.  10110011

D.  None of these

3. The output of SR flip flop when S=1, R=0 is

A.  1

B.  0

C.  No change

D.  High impedance

4. The number of flip flops contained in IC 7490 is

A.  2.

B.  3.

C.  4.

D.  10.

5. The number of control lines for 32 to 1 multiplexer is

A.  4.

B.  5.

C.  16.

D.  6.

6. How many two-input AND and OR gates are required to realize Y=CD+EF+G

A.  2,2.

B.  2,3.

C.  3,3.

 D.  None of these.

7. Which of following can not be accessed randomly

A.  DRAM.

 B.  SRAM.

C.  ROM.

D.  Magnetic tape.

8. The excess-3 code of decimal 7 is represented by

A.  1100.

B.  1001.

C.  1011.

D.  1010.

9.When an input signal A=11001 is applied to a NOT gate serially, its output signal is

A.  00111.

B.  00110.

C.  10101.

D.  11001.

10. The result of adding hexadecimal number A6 to 3A is

A.  DD.

B.  E0.

C.  F0.

D.  EF.