OPERATING SYSTEM MCQS PART 15

OPERATING SYSTEM MCQS PART 15

1. The hexadecimal number (3E8)16 is equal to decimal number ………
1. 1000         
2. 982           
3. 768      
4. 323
Answer : 1
Explanation:  3 x 162 + 14 x 161 + 8 = 1000

2. The number of distinct Boolean expression of 4 variables is …….
1. 16            
2. 256          
3. 1024          
4. 65536
Answer : 4

 
3. A memory system of size 16 k bytes is to be designed using memory chips which have 12 address lines and 4 data lines each. The number of such chips required to design the memory system is ……….
1. 2               
2. 4              
3. 8    
4. 18
Answer : 3
Explanation:
(16×1024×8)/(4096×4) = 8

4. In a 7 segment display, LEDs b and c lit up. The decimal number displayed is ……….
1. 9                
2. 7               
3. 3            
4. 1
Answer : 1

5. In a BCD to 7 segment decoder the minimum and maximum number of outputs active at any time is ….
1. 2 and 7   
2. 3 and 7            
3. 1 and 6   
4. 3 and 6
Answer: 1
Explanation:
Minimum number of outputs when input is decimal 1 and maximum number of outputs when input is decimal 8.

6. A three state switch has three outputs. These are …….. , …….. , ……….
1. low, low and high             
2. low, high, high
3. low. floating, low             
4. low, high, floating
Answer: 4

7. Maxterm designation for A + B + C is ……….
1. M0            
2. M1              
3. M3         
4. M4
Answer: 1
Explanation: A + B + C = 000 = M0

8. 1’s complement of 11100110 is ……………….
1. 00011001      
2. 10000001  
3. 00011010  
4. 00000000
Answer: 1