1. Which among the following is an appropriate binary conversion for the number 421 (which is of base 10)?
10101010
11010100
10011001
110100101
010101010
Solution:
Given number 421 is of base 10 which means it is a decimal number. For decimal to binary conversion divide 421 by 2.
Since we are dividing by 2, when the dividend is even the binary remainder will be 0, and when the dividend is odd the binary remainder will be 1.

2. If A and B are two input ends of AND logic gate and AB is the only output. What will be the output if the input is A=1 and B=0?
1
0
101
01
10
Solution:

3. If ∆ represents ‘1’ and ○ represents ‘0’. What will be the one’s complement of - ○∆∆○○∆?
011001
100110
101010
000000
111111
Solution:
○∆∆○○∆ represents 011001. For finding one’s complement we change each 1 to 0 and each 0 to 1. Hence One’s complement of 011001 will be 100110. (Note: this is not the same question as the one asked in SBI mains.)

4. Following diagram depicts which logic gate?

NOR gate
NOT gate
OR gate
NAND gate
None of the above

5. Which of the following is a correctset of hexadecimal digits?
102n
a19fk
ZOLO12
FACE
0101xx
Solution:
hexadecimal digits are written using symbols from 0-9 or A-F

6. Which of the following is a Logical Conjunction?
AND gate
OR gate
NOT gate
both(a) and (b)
All of the above
Solution:
When two statements are combined with an 'and,' then it is a conjunction. For conjunctions, both statements must be true for the compound (result) statement to be true. When your two statements are combined with an 'or,' it is a disjunction.

7. If Ó¢ represents ‘1’ and á¹ˆ represents ‘0’. A and B are two input ends of OR logic gate and C is the only output. What will be the output if the input is A=Ó¢ and B=Ó¢?
á¹ˆÓ¢
á¹ˆ
Ó¢
Ó¢á¹ˆ
Ó¢á¹ˆÓ¢
Solution:
.

8. Which of the following is not a valid binary number?
00000
11111
FFFFF
101010
010101

9. Which of the following symbol represents decisional or conditional statement in a flow chart?

a
b
c
d
e

10. What are the permitted digits that can be used in Octal Number system?
0-10
1-9
0-8
0-7
1-8