# 3i Infotech Placement: Sample Questions 971 - 973 of 1245

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## Question 971

### Question

MCQ▾

How many squares with sides 1/2 inch long are needed to cover a rectangle that is 4 ft long and 6 ft wide?

Choice (4)

a.

24

b.

13824

c.

3456

d.

96

b.

### Explanation

We already know that, 1 ft = 12 inches

Length of the rectangle is 4 ft. So, length inches

Width of the rectangle is 6 ft. So, width inches

From the area of rectangle we are making some number of squares. Let it be x.

Length of square is inches.

So,

So, we can make 13824 squares from the given rectangle.

## Question 972

Edit

### Write in Short

What are the difference between malloc () and calloc ()

### Explanation

 Malloc () Calloc () Allocates only single block of requested memory Allocate multiple block or requested memory. doesn՚t initialize the allocated memory. Initialize the allocated memory to zero. Contains garbage value Does not contain garbage value. Faster than calloc Longer than malloc Takes one argument that is number of bytes. Take two arguments those are number of blocks and size of each block.

## Question 973

Edit

### Describe in Detail

Essay▾

What is an advantage of executing a process in background?

### Explanation

• The most common reason to put a process in the background is to do something else interactively without waiting for the process to complete.
• This is done by adding a special background symbol, & at end of the command.
• Tells the shell to execute the given command in the background.
• Example:
• cp ⚹ . ⚹ . . / backup& (cp is for copy) .

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