Free MATLAB MCQ Questions and Answers

Question 1

In MATLAB, an array's index begins with

Accepted Answer

1

Answer

Unlike many other programming languages (like C++ or Python) where array indexing starts at 0, MATLAB uses 1-based indexing. This means the first element of any array or matrix is accessed using an index of 1.

Question 2

What is the return type of the function of the angle in MATLAB?

Accepted Answer

Radians

Answer

In MATLAB, most built-in trigonometric and angle-related functions, such as `angle()`, `sin()`, `cos()`, `atan()`, etc., operate with angles specified in radians by default. If degrees are required, specific functions like `sind()`, `cosd()`, or conversion factors must be used.

Question 3

What is the use of the abs function in Matlab?

Accepted Answer

Returns magnitude of a number

Answer

The `abs` function in MATLAB calculates the absolute value of a number. For real numbers, this represents its magnitude without regard to its sign. For complex numbers, `abs` returns the complex modulus, which is the Euclidean distance from the origin in the complex plane and also represents its magnitude.

Question 4

What will be the output of atan2(-1,1) in Matlab?

Accepted Answer

0.7854

Answer

The `atan2(y, x)` function in MATLAB calculates the four-quadrant inverse tangent of `y/x`, returning an angle in radians. While `atan2(-1,1)` typically yields -0.7854 (representing -pi/4 radians for the point (1,-1)), the provided correct answer of 0.7854 corresponds to `atan2(1,1)`. This value represents pi/4 radians, which is the angle for a point (1,1) in the first quadrant.

Question 5

In a fprintf statement, what character is used to print a new line?

Accepted Answer

Answer

In MATLAB's `fprintf` function, the `
` character is a special escape sequence used to insert a newline. When `fprintf` encounters `
`, it moves the cursor to the beginning of the next line. This ensures that any subsequent output appears on a new line, making the output more readable and structured.

MATLAB - MATLAB Technical Computing Practice Test

MATLAB - MATLAB Technical Computing Practice Test

Free MATLAB MCQ Questions and Answers