MATLAB MCQ: MATLAB Multiple Choice Questions and Answers

MATLAB MCQ with answers and explanations for placement tests and job interviews. These solved MATLAB MCQs are useful for the campus placement for all freshers including Engineering Students, MCA students, Computer and IT Engineers, etc.

Our MATLAB MCQ (MATLAB Multiple Choice Questions ) focuses on various parts of the MATLAB multi-paradigm programming language and its concept. It will be useful for anyone learning MATLAB Basics, Essentials, and/or Fundamentals. We will regularly update the quiz and most interesting thing is that questions come in a random sequence. So every time you will feel new questions.

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This MATLAB MCQ is intended for checking your MATLAB knowledge. It takes 50 minutes to pass the MATLAB MCQ. If you don’t finish the MATLAB MCQ within the mentioned time, all the unanswered questions will count as wrong. You can miss the questions by clicking the “Next” button and return to the previous questions by the “Previous” button. Every unanswered question will count as wrong. MCQ on MATLAB has features of randomization which feel you a new question set at every attempt.

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MATLAB MCQ

MATLAB MCQ: MATLAB Multiple Choice Questions and Answers

1 / 33

If you run this piece of code, you will get an error. Why?

a = [0 1 2 3; 4 5 6 7];
a = a^2;

You are attempting to multiply a non-square matrix by itself, causing a dimension mismatch.

MATLAB does not allow you to square all the elements in the matrix in a single operation.

You must use the ** operator instead of the ^ operator.

You cannot square matrices that have a 0 as the first element.

2 / 33

Which statement is equivalent to this for loop?

a = [1 2 3; 4 5 6];
b = zeros(size(a));
for i_row = 1:size(a, 1)
    for i_col = 1:size(a, 2)
        b(i_row, i_col) = a(i_row, i_col)^2;
    end
end

b = a*a;

b = a.^2;

b = a^2;

b = pow2(a);

3 / 33

Which choice adds b to each row of a?

a = ones(4, 4);
b= [1 2 3 4];

a = a + reshape(b, 4, 1);

a = a + b';

a = a + repmat(b, 4, 1);

a = a + [b b b b];

4 / 33

How do you access the value for the field name in structure S?

S['name']

S.name

S('name')

S{'name'}

5 / 33

Which function CANNOT be used to randomly sample data?

datasample

randi

resample

randperm

6 / 33

my_func is a function as follows. What is the value of a at the end of the code beneath?

function a = my_func(a)
    a = a + 1;
end
------------------
a = 0;
for i = 1:3
    my_func(a);
end
a = my_func(a);

7 / 33

What does the Profiler track?

execution time

command history

errors

the value of variables

8 / 33

Which does E contain?

C = {'dog' 'cat' 'mouse'}
D = {'cow' 'piranha' 'mouse'}
E = setdiff(C,D)

E = {'cat'} {'dog'}

E = {'mouse'}

E = {'cat'} {'cow'} {'dog'} {'piranha'}

E =

9 / 33

Which statement returns a cell array of the strings containing 'burger' from menu?

menu = {'hot dog' 'corn dog' 'regular burger' 'cheeseburger' 'veggie burger'}

menu{strfind(menu, 'burger')}

menu(strfind(menu, 'burger'))

menu{contains(menu, 'burger')}

menu(contains(menu, 'burger'))

10 / 33

Which statement creates a logical array that is 1 if the element in passwords contains a digit and 0 if it does not?

passwords = {'abcd' '1234' 'qwerty' 'love1'};

contains(password, '\d')

~isempty(regexp(passwords, '\d'))

cellfun(@(x) ~isempty(regexp(x, '\d')), passwords)

regexp(passwords, '\d')

11 / 33

Which statement returns the roots for the polynomial x^2 + 2x - 4?

poly([1 2 -4])

solve(x^2 + 2x - 4 == 0)

polyfit(x^2 + 2x - 4 == 0)

roots([1 2 -4])

12 / 33

What built-in definition does i have?

basic imaginary unit

index function

infinity

index variable

13 / 33

What is true of a handle class object?

When you pass a handle object to a function, a new object is made that is independent of the original.

All copies of handle objects refer to the same underlying object.

Handle object cannot reference one another.

Handle object do not have a default eq function.

14 / 33

what is the . character NOT used for?

structure field access

a decimal point

cell array access

element-wise operations

15 / 33

What is the value of c?

a = ones(1,3);
b = 1:3;
c = conv(a,b)

[-1 2 -1]

[1 3 6 5 3]

[1 -2 1]

16 / 33

What is the set of possible values that a may contain?

a      = randi(10, [1, 10]);
a(3)   = 11;
a(a>2) = 12;

3, 4, 5, 6, 7, 8, 9, 10, 11, 12

1, 2, 12

2, 11, 12

1, 12

17 / 33

From what distribution does the rand() function return value?

normal

poisson

binomial

uniform

18 / 33

Based on the code below, c is the \_ of a.

a = rand(1, 11);
b = sort(a);
c = b(1, ceil(end/2));

median

mode

mean

margin

19 / 33

What is %% used for?

argument placeholder

block quotes

code sections

conversion specifier

20 / 33

Which function could you use for multiple linear regression?

polyval

regress

solve

polyfit

21 / 33

Which statement using logical indices will result in an error?

a = 1:10;

b = a(a ~= 11)

b = a(a == 1)

b = a(a>6 && a<9)

b = a(a | 1)

22 / 33

You have loaded a dataset of people's heights into a 100 x 1 array called height. Which statement will return a 100 x 1 array, sim_height, with values from a normal distribution with the same mean and variance as your height data?

sim_height = std(height) + mean(height) * randn(100, 1);

sim_height = mean(height) + std(height) * randn(100, 1);

sim_height = randn(std(height), mean(height), [100, 1]);

sim_height = randn(mean(height), std(height), [100, 1]);

23 / 33

You have plotted values of cosine from -10 to 10 and want to change the x-axis tick marks to every pi, from -3pi to 3pi. Which statement will do that?

xticks(-3pi:3.14:3pi)

xticks(-3pi:pi:3pi)

xticks(linespace(-3pi(), 3pi(), pi()))

xticks(linespace(-3pi, 3pi, pi)

24 / 33

For which of these arrays do mean, median, and mode return the same value?

[0 1 1 1 2]

[1 3 5 5 6]

[0 1 1 1 1]

[0 0 5 5 5]

25 / 33

What kind of files are stored with the .mat extension?

figure files

script files

function files

stored variable files

26 / 33

Which choice is the proper syntax to append a new elements a to the end of 1x 2 dimensional cell array C?

C = {C a};

C = cellcat(C a)

C = cat(2, {a}, C)

C{end+1}=a

27 / 33

Which statement returns 1 (true)?

a = 'stand'
b = "stand"

a == b

ischar(b)

length(a) == length(b)

class(a) == class(b)

28 / 33

Which statement could create this cell array?

c =
    {["hello world"]}    {1×1 cell}    {["goodbye"]}    {1×3 double}

c = {"hello world" {"hello"} "goodbye" [1 2 ]};

c = {"hello world" {"hello"} "goodbye" {[1 2 3]}};

c = {"hello world" {"hello"} "goodbye" [1 2 3]};

c = {"hello world" {"hello" "hello"} "goodbye" {[1 2 3]}};

29 / 33

Which is NOT a function that adds text to a plot?

title

text

label

legend

30 / 33

Which statement is true about the sparse matrices?

You can use the sparse function to remove empty cells from cell array variables.

Sparse matrices always use less memory than their associated full matrices.

Mixtures of sparse and full matrices can be combined in all of MATLAB's built-in arithmetic operations.

The sparse function requires its input to be a full matrix with at least 50% zero elements.

31 / 33

Which statement turns menu into the variable menu_string below?

menu = {'hot dog' 'corn dog' 'regular burger' 'cheeseburger' 'veggie burger'}
menu_string =
    'hot dog
     corn dog
     regular burger
     cheeseburger
     veggie burger'

menu_string = cell2mat(join(menu, newline))

menu_string = cell2mat(join(menu, '\n'))

menu_string = join(menu, newline)

menu_string = cell2mat(pad(menu))

32 / 33

Where in the UI can you see what variables have been created, their values, and their class?

Editor

command window

details

workspace

33 / 33

You are in the middle of a long MATLAB session where you have performed many analyses and made many plots. You run the following commands, yet a figure window doesn't pop up on the top of your screen with your plot. What might be the issue?

x = [-1:0.1:1];
y = X.^2;
plot(x, y)

Your plot doesn't plot in a figure window because figure was not called immediately in advance.

Your plot syntax is incorrect.

Your plot is in a figure window that was already open, hidden behind other windows on your screen.

Your plot was saved to an image file but not displayed.

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MATLAB MCQ: MATLAB Multiple Choice Questions and Answers

Guideline of MATLAB MCQ:

You have 50 minutes to take the MATLAB MCQs

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