Cisco Placement Paper 2010

1. Implement the NOR gate as an inverter. 2. What is the effect of temperature on the Icb in a transistor 3. What is the bit storage capacity of a ROM with a 512*4 organisation? 4. What is the reason of the refresh operation in dynamic RAM's ? 5. Suppose that the D input of a flip flop changes from low to high in the middle of a clock pulse.Describe what happens if the flip flop is a positive edge triggered type? 6. In a sequential search, what is the average number of comparisons it takes to search through n elements ? Ans: (n+1)/2. 7. What is the size of the array declared as double * X[5] ? Ans. 5 * sizeof ( double * ) 8. A binary search tree with node information as 1,2,3,4,5,6,7,8 is given. Write the result obtained on preorder traversal of the binary search tree ? Ans : 53124768 9. If size of the physical memory is 232-1, then what is the size of the virtual memory ? 10. S -> A0B A-> BB|0 B-> AA|1 How many strings of length 5 are possible with the above productions?  int i=0xaa       char *p;       p=(char *)i;       p=p>>4;       printf("%x",p);       ans:0x000000a;   11.       union       { char *p;       int i;       char b;       }       main()       {       --       p=(char*)malloc(8*sizeof(char));       }       what is the size of union? 12. A triangle ABC is given, a line DE is paralel to base side and that cuts the triangle. The ratio of area of triangle to the area of trapezium .given DE/BC=3/5. 13. Four concentric circles are given. The radius of 1st circle is x.next is 2x,then 3x and 4x. given that area b/w 2nd and 1st is A and 4th and 3rd circles being B.find ratio of A to B 14. main() { int a; printf(?%d?,scanf(%d,&a)); } wats o/p of this pgm. What will b printed ans :0 15. arrays base address is 1000?.array is a[5][4]..then wat is de correct address of a[4][3]? ans:1056 16. main() { int *i; int s=(int *)malloc(10*sizeof(int)); for (i=0;i<10;i++) { printf(?%d?,i*i) } whats the output? 17. What is the size of the array declared as double * X[5] ANS: 5* sizeof (double *)   18. A binary search tree is given and asked to write the preorder traversal result. 19. If size of the physical memory is 2^32-1, then the size of virtual memory...... 20. (3*4096+15*256+3*16+3). How many 1's are there in the binary representation of the result.       ANS: 10

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