ISRO CS 2015

Question 61

Which of the following compression algorithms is used to generate a .png file?

• LZ78
• Deflate
• LZW
• Huffman

Question 62

Dirty bit for a page in a page table

• helps avoid unnecessary writes on a paging device
• helps maintain LRU information
• allows only read on a page
• None of the above

Question 63

Which of the following is not an image type used in MPEG?

• A frame
• B frame
• D frame
• P frame

Question 64

Consider an uncompressed stereo audio signal of CD quality which is sampled at 44.1 kHz and quantized using 16 bits. What is required storage space if a compression ratio of 0.5 is achieved for 10 seconds of this audio?

• 172 KB
• 430 KB
• 860 KB
• 1720 KB

Question 65

What is compression ratio in a typical mp3 audio files?

• 4:1
• 6:1
• 8:1
• 10:1

Question 66

Consider the following program fragment

if(a > b)
if(b > c)
s1;
else s2;

s2 will be executed if

• a <= b
• b > c
• b >= c and a <= b
• a > b and b <= c

Question 67

The following program

main()
{
inc(); inc(); inc();
}
inc()
{
static int x;
printf("%d", ++x);
}

• prints 012
• prints 123
• prints 3 consecutive, but unpredictable numbers
• prints 111

Question 68

Consider the following program fragment i=6720; j=4; while (i%j)==0 { i=i/j; j=j+1; } On termination j will have the value

• 4
• 8
• 9
• 6720

Question 69

Consider the following declaration:

int a, *b=&a, **c=&b;

The following program fragment

a=4;
**c=5;

• does not change the value of a
• assigns address of c to a
• assigns the value of b to a
• assigns 5 to a

Question 70

The output of the following program is

main()
{
static int x[] = {1,2,3,4,5,6,7,8}
int i;
for (i=2; i<6; ++i)
x[x[i]]=x[i];
for (i=0; i<8; ++i)
printf("%d", x[i]);
} 

• 1 2 3 3 5 5 7 8
• 1 2 3 4 5 6 7 8
• 8 7 6 5 4 3 2 1
• 1 2 3 5 4 6 7 8