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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MATLAB MCQ

MATLAB MCQ: MATLAB Multiple Choice Questions and Answers

1 / 33

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

title

text

label

legend

2 / 33

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

S['name']

S.name

S('name')

S{'name'}

3 / 33

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

normal

poisson

binomial

uniform

4 / 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.

5 / 33

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

Editor

command window

details

workspace

6 / 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))

7 / 33

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

figure files

script files

function files

stored variable files

8 / 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]);

9 / 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)

10 / 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

11 / 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];

12 / 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]

13 / 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 =

14 / 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

15 / 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])

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

What does the Profiler track?

execution time

command history

errors

the value of variables

18 / 33

What built-in definition does i have?

basic imaginary unit

index function

infinity

index variable

19 / 33

what is the . character NOT used for?

structure field access

a decimal point

cell array access

element-wise operations

20 / 33

Which function could you use for multiple linear regression?

polyval

regress

solve

polyfit

21 / 33

Which statement returns 1 (true)?

a = 'stand'
b = "stand"

a == b

ischar(b)

length(a) == length(b)

class(a) == class(b)

22 / 33

What is %% used for?

argument placeholder

block quotes

code sections

conversion specifier

23 / 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'))

24 / 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]}};

25 / 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.

26 / 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')

27 / 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)

28 / 33

Which function CANNOT be used to randomly sample data?

datasample

randi

resample

randperm

29 / 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);

30 / 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.

31 / 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]

32 / 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);

33 / 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.

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MATLAB MCQ: MATLAB Multiple Choice Questions and Answers

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