MTH643 Quiz 1

Q1. What does ans refer to in MATLAB?

1. A reserved keyword
2. The output of the last executed command
3. Any assigned variable
4. An answer function

Correct answer: The output of the last executed command

Q2. Which of the following MATLAB command clears all data and variables stored in memory?

1. clear
2. clc
3. delete
4. None of these

Correct answer: clear

Q3. In MATLAB, : operator in a vector creation, such as 2:5, indicates:

1. A range from 2 to 5
2. A loop
3. A multiplication factor
4. None of these

Correct answer: A range from 2 to 5

Q4. Which operator is used to check if two elements are equal in MATLAB?

1. !=
2. Isequal
3. ==
4. =

Correct answer: ==

Q5. The output of the code syms x y ; (x-y)*(x-y)^2 in MATLAB is ________.

1. (x-y)^3
2. (x-y)^2
3. (x-y)*(x-y)*(x-y)
4. X^3-3*x^2*y+3*x*y^2-y^3

Correct answer: (x-y)^3

Q6. Which of the following will be the output of the command a = [1 0 2]; b = [3 0 7]; c=a*b

1. [4 0 9]
2. this command will give the error message
3. None of these
4. [3 0 14]

Correct answer: this command will give the error message

Q7. MATLAB stands for ____________.

1. Multiplication, Addition, Table, Linear Algebra, Basis
2. Matrix Laboratory
3. Matrix Linear Algebra
4. Master Laboratory

Correct answer: Matrix Laboratory

Q8. What does a line starting with % signify in a script file?

1. A function
2. An error
3. A command
4. A comment

Correct answer: A comment

Q9. What is the function of format long in MATLAB?

1. Rounds off numbers
2. Formats text output
3. Displays results to 15 decimal places
4. Clears the Workspace

Correct answer: Displays results to 15 decimal places

Q10. How can you extract the third entry from a vector Y?

1. get(Y,3)
2. extract(Y,3)
3. Y(3)
4. Y{3}

Correct answer: Y(3)