Which of the following is a correct SQL syntax for creating an index on multiple columns?

The correct answer is D: Both A and B are correct. Both syntaxes are valid in SQL. The first creates a composite index, while the second creates a unique composite index.

What will be the output of: int a = 10; int b = 20; int c = a + b; printf("%d", c);?

The correct answer is B: 30. Variable 'a' is initialized to 10, 'b' is initialized to 20. When c = a + b, c becomes 10 + 20 = 30. Therefore, printf outputs 30.

What is the difference between declaration and definition in C?

The correct answer is B: Declaration informs compiler about type, definition allocates memory. Declaration tells the compiler about a variable's name and type (e.g., 'extern int x;'). Definition actually allocates memory (e.g., 'int x = 5;'). A variable can be declared multiple times but defined only once.

What is the purpose of the return statement in a C function?

The correct answer is B: To return a value to the caller and exit the function. The return statement is used to exit a function and return a value (if any) to the calling function. If the function has return type void, no value is returned.

In AI/ML, what does a neural network's activation function do?

The correct answer is A: Introduce non-linearity to enable learning complex patterns. Activation functions (ReLU, Sigmoid, Tanh) add non-linearity, allowing neural networks to learn non-linear relationships. Without them, networks become linear classifiers.

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Q.61 Medium C Programming

What will be the output of: int x = 5, y = 10; if (x < y) printf("yes"); else printf("no");

A yes

B no

C Compilation error

D No output

Correct Answer: A. yes

Explanation:

The condition x < y evaluates to true (5 < 10), so the if block executes, printing 'yes'. The else block is skipped.

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Q.62 Medium C Programming

Which of the following is NOT a valid way to pass arguments to a function in C?

A Pass by value

B Pass by reference

C Pass by pointer

D All are valid

Correct Answer: B. Pass by reference

Explanation:

C supports pass by value and pass by pointer/address. 'Pass by reference' as a concept exists in C++, not in C. In C, to achieve reference-like behavior, we use pointers.

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Q.63 Medium C Programming

What will be the result of: int a = 10, b = 3; int c = a % b; printf("%d", c);

A 3

B 1

C 13

D 30

Correct Answer: B. 1

Explanation:

The modulus operator % returns the remainder of division. 10 % 3 = 1 (since 10 = 3 × 3 + 1). Therefore, c = 1 and the output is 1.

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Q.64 Medium C Programming

What will be the output of: char ch = 'A'; printf("%d", ch);

A A

B 65

C Error

D 65.0

Correct Answer: B. 65

Explanation:

When a character is printed using %d format specifier, its ASCII value is printed. The ASCII value of 'A' is 65.

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Q.65 Medium C Programming

What is the output of: int x = 5; int y = ++x + x++; printf("%d %d", x, y);

A 7 12

B 6 11

C 7 13

D 6 12

Correct Answer: A. 7 12

Explanation:

Step 1: x=5. Step 2: ++x makes x=6 (pre-increment, used immediately). Step 3: y = 6 + x++ = 6 + 6 = 12. Step 4: x++ increments x to 7 after use. Final: x=7, y=12.

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Q.66 Medium C Programming

What is the output of: int a = 10, b = 20; a = a ^ b; b = a ^ b; a = a ^ b; printf("%d %d", a, b);

A 10 20

B 20 10

C 0 0

D 20 20

Correct Answer: B. 20 10

Explanation:

This is XOR swap algorithm. Step 1: a = 10^20. Step 2: b = (10^20)^20 = 10. Step 3: a = (10^20)^10 = 20. Result: a=20, b=10 (values are swapped).

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Q.67 Medium C Programming

In C, which function is used to read a string from input with space handling?

A scanf("%s", str);

B fgets(str, sizeof(str), stdin);

C gets(str);

D getline(str);

Correct Answer: B. fgets(str, sizeof(str), stdin);

Explanation:

fgets() is the safe way to read strings including spaces. scanf("%s") stops at whitespace, gets() is deprecated and unsafe due to buffer overflow risks.

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Q.68 Medium C Programming

What is the purpose of the 'static' keyword when used with a variable inside a function?

A To make the variable global

B To preserve the variable's value between function calls

C To prevent the variable from being modified

D To allocate memory on the stack

Correct Answer: B. To preserve the variable's value between function calls

Explanation:

A static variable inside a function is initialized only once and retains its value between successive function calls. It has memory allocated in the data segment, not the stack.

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Q.69 Medium C Programming

Which of the following correctly represents a structure declaration in C?

A struct {int a; char b;} s;

B struct Name {int a; char b;};

C Both A and B are correct

D Neither A nor B is correct

Correct Answer: C. Both A and B are correct

Explanation:

Both are valid syntax. Option A declares an anonymous structure with immediate variable instantiation. Option B declares a named structure type that can be used later to create variables.

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Q.70 Medium C Programming

What will be the final value of x: int x = 5; x += 3 * 2; printf("%d", x);

A 16

B 11

C 13

D 36

Correct Answer: A. 16

Explanation:

Step 1: x = 5. Step 2: 3 * 2 = 6 (multiplication has higher precedence). Step 3: x += 6 means x = x + 6 = 5 + 6 = 11. Wait, let me recalculate: x = 5; x += 6 gives x = 11. The answer should be B (11), not A. Correction: The correct answer is B.

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