Data and Variables: A Comprehensive Guide for Biology Students

Question 1

Which data type is used in Python to represent True or False values?

Accepted Answer

Boolean

Answer

Integer

Answer

Float

Answer

String

Question 2

Which comparison operator is used in Python to check if two values are equal?

Accepted Answer

==

Answer

=

Answer

!=

Answer

>=

Question 3

What does the Python code 'x = 5; y += x;' do?

Accepted Answer

Adds 5 to y

Answer

Assigns 5 to y

Answer

Compares x and y

Answer

Increments x by 5

Question 4

What is the main difference between a variable and a constant in Python?

Accepted Answer

Variables can be reassigned, but constants cannot

Answer

Constants are defined using the 'const' keyword

Answer

Variables store primitive values, while constants store objects

Answer

There is no difference between variables and constants

Question 5

Which of the following is NOT a primitive data type in Python?

Accepted Answer

Dictionary

Answer

Integer

Answer

Float

Answer

Boolean

Question 6

What is the result of the following Python code: print(type(True))?

Accepted Answer

Answer

Answer

Answer

Question 7

Which Python function can be used to convert a string to an integer?

Accepted Answer

int()

Answer

float()

Answer

bool()

Answer

str()

Question 8

In Python, the following code evaluates a compound condition using the AND operator:

```
if (age >= 18) and (gender == 'M'):
    print('Eligible for military service')
```

Under what condition will the code print 'Eligible for military service'?

Accepted Answer

When age is 18 or older and gender is 'M'.

Answer

When age is less than 18 and gender is 'F'.

Answer

When age is any value and gender is 'M'.

Answer

When age is 18 or older and gender is any value.

Question 9

In the code snippet below, what does the variable declaration and initialization accomplish? 
```
int a = 10;
```

Accepted Answer

Declares an integer variable named 'a' and assigns the value 10 to it.

Answer

Declares a floating-point variable named 'a' and initializes it to 10.

Answer

Only declares the variable 'a' without initializing it.

Answer

Initializes the variable 'a' to 10 without declaring it.

Question 10

In Java, which syntax correctly declares a variable named 'num' to store an integer?

Accepted Answer

int num;

Answer

Integer num;

Answer

num : int;

Answer

int num =

Question 11

What is the default value of an uninitialized integer variable in Java?

Accepted Answer

0

Answer

null

Answer

random value

Answer

compile-time error

Question 12

Which of the following operators is used to check if two integers are equal in Java?

Accepted Answer

==

Answer

=

Answer

===

Answer

!=

Question 13

What is the purpose of type casting in Java?

Accepted Answer

To convert a value from one data type to another

Answer

To check the type of a variable at runtime

Answer

To declare a new variable of a different type

Answer

To prevent compiler errors

Question 14

Which Java data type is used to store true or false values?

Accepted Answer

boolean

Answer

int

Answer

char

Answer

String

Question 15

What is the result of executing the following Java code: 'System.out.println(5 % 2);'?

Accepted Answer

1

Answer

0

Answer

2

Answer

5

Question 16

Which data type is most appropriate for representing the number of students in a class?

Accepted Answer

int

Answer

float

Answer

str

Answer

bool

Question 17

Which operator is used in Python to check if two values are not equal?

Accepted Answer

!=

Answer

=

Answer

==

Answer

<>

Question 18

What is the purpose of the 'input()' function in Python?

Accepted Answer

To get user input and store it in a variable

Answer

To convert a value to a specific data type

Answer

To check the data type of a value

Answer

To delete a variable

Question 19

What is the difference between a parameter and an argument in a function definition?

Accepted Answer

Parameters are defined in the function definition, while arguments are passed when the function is called.

Answer

Arguments are defined in the function definition, while parameters are passed when the function is called.

Answer

Parameters and arguments are the same thing.

Answer

Parameters are passed by value, while arguments are passed by reference.

Question 20

Which of the following is a valid identifier name in Java?

Accepted Answer

$value

Answer

10x

Answer

my-name

Answer

true

Question 21

Which data type is appropriate for storing a student's name?

Accepted Answer

String

Answer

Integer

Answer

Float

Answer

Boolean

Question 22

Which operator is used to assign a value to a variable?

Accepted Answer

=

Answer

+

Answer

-

Answer

*

Question 23

What is the output of the following code snippet in C++: int num = 5; num++; cout << num;

Accepted Answer

6

Answer

5

Answer

Error

Answer

Depends on compiler settings

Question 24

Which of the following is a valid variable name in Java?

Accepted Answer

_age

Answer

1age

Answer

age%

Answer

age.name

Question 25

What is the key distinction between a variable and a constant?

Accepted Answer

Variables can be modified, constants cannot.

Answer

Constants can be modified, variables cannot.

Answer

Variables are declared with 'var', constants with 'const'.

Answer

There is no difference.

Question 26

In Python, which syntax correctly declares an array of integers?

Accepted Answer

arr = [1, 2, 3];

Answer

int[] arr = [1, 2, 3];

Answer

int arr[] = {1, 2, 3};

Answer

array arr = [1, 2, 3];

Question 27

What is the primary purpose of a semicolon (;) in JavaScript?

Accepted Answer

To end a statement

Answer

To separate variables

Answer

To start a loop

Answer

To define a function

Question 28

Which operator is used to assign a value to a variable in Java?

Accepted Answer

=

Answer

+

Answer

*

Answer

%

Question 29

Which data type is most appropriate for representing a student's age, which can be expressed as a whole number?

Accepted Answer

int

Answer

char

Answer

float

Answer

bool

Question 30

In Python, what is the default value assigned to an integer variable that has not been explicitly initialized?

Accepted Answer

0

Answer

undefined

Answer

null

Question 31

Which comparison operator tests for equality between two variables?

Accepted Answer

==

Answer

=

Answer

!=

Question 32

Describe the primary distinction between variables and constants in programming.

Accepted Answer

Variables can be modified, whereas constants maintain a fixed value.

Answer

Variables are used to store data, while constants are used for operations.

Answer

Constants can be initialized, but variables cannot.

Question 33

Which data type is suitable for storing a website's URL?

Accepted Answer

string

Answer

boolean

Answer

float

Answer

int

Question 34

What is the primary purpose of type casting in编程?

Accepted Answer

To convert a variable from one data type to another.

Answer

To create a new variable with a different data type.

Answer

To check the data type of a variable.

Question 35

Which of the following is not a fundamental data type in C++?

Accepted Answer

string

Answer

char

Answer

float

Answer

int

Question 36

Which of the following is the correct data type to represent whole numbers with no decimal?

Accepted Answer

int

Answer

string

Answer

double

Answer

char

Question 37

What is the proper syntax to declare a variable named 'age' that can store an integer?

Accepted Answer

int age;

Answer

age = int;

Answer

age int;

Answer

int age

Question 38

Which of these operators is used to assign a value to a variable?

Accepted Answer

=

Answer

-

Answer

/

Answer

+

Question 39

In Java, which of the following is NOT a primitive data type?

Accepted Answer

boolean array

Answer

int

Answer

float

Answer

char

Question 40

What is the default value of an integer variable if it's not explicitly initialized?

Accepted Answer

0

Answer

garbage value

Answer

random number

Answer

null

Question 41

Which data type should be used to represent a decimal number?

Accepted Answer

double

Answer

string

Answer

int

Answer

char

Question 42

Which operator is used to concatenate two strings in programming?

Accepted Answer

+

Answer

-

Answer

*

Answer

/

Question 43

Which of the following data types is suitable for storing whole numbers without decimal points?

Accepted Answer

int

Answer

float

Answer

boolean

Answer

string

Question 44

Consider the following Python code:

def square(num):
    return num * num
What is the data type of the variable `num` in the given code?

Accepted Answer

int or float

Answer

string

Answer

None

Answer

boolean

Question 45

Which operator is used to concatenate strings in Python?

Accepted Answer

+

Answer

%

Answer

*

Answer

/

Question 46

Consider the following Python code:

def average(a, b, c):
    total = a + b + c
    return total / 3
What is the return type of the `average` function?

Accepted Answer

float

Answer

int

Answer

boolean

Answer

string

Question 47

Which of the following Python statements correctly declares a list?

Accepted Answer

my_list = []

Answer

my_list = ()

Answer

my_list = { }

Answer

my_list = {}

Question 48

Consider the following Python code:

my_dict = {"name": "John Doe", "age": 30}
What is the data type of the value associated with the key "age"?

Accepted Answer

int

Answer

string

Answer

float

Answer

boolean

Question 49

Which of the following is NOT a valid variable name in Python?

Accepted Answer

123abc

Answer

MY_VARIABLE

Answer

myVariable

Answer

_my_variable

Question 50

Consider the following Python code:

my_string = "Hello World"
How can you access the third character of the string?

Accepted Answer

my_string[2]

Answer

my_string.get(2)

Answer

my_string(2)

Question 51

Which of the following Python functions is used to convert a string to uppercase?

Accepted Answer

upper()

Answer

lower()

Answer

capitalize()

Answer

title()