Class 8 Computer Science Notes, Unit 4: Programing -- Exercise Short Response and Miscellaneous (within the chapter) Questions and Answers.

Class 8 Computer Science Notes

Unit-4 

"Programing"

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Class 8 Computer Science MCQs (All Units Exercise) 

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Exercise Short Response Questions and Answers:

Q1. For the following code block sprite will turn to 30 degrees. How many clicks are required for the sprite to complete a full cycle?

Ans:

In a complete full cycle, there are 360 degrees, and 360/30 = 12. Thus 12 clicks are required for a sprite to complete a full cycle.

Q2. What is the difference in outputs of the following code blocks, having 4 backdrops?

Ans:

In this case, the sprite moves forward 10 steps delaying 0.5 seconds, and code to execute a task that is to be achieved multiple times can iteratively be embedded in a simple loop. 

In this case, the sprite moves forward 10 steps and each step delaying time 0.5 seconds, and the coder to execute a task that is to be achieved multiple times can iteratively be embedded in a simple loop.

Q3. For the maze game, duplicate the 'maze map' and rename it 'maze- map2'. Next, change the color of the line in the new map from blue to red. Add scripts such that the games become a multi-level game with the 2 distinct images.

Ans:

Follow the instruction given in the question and perform the activity by using scratch programming on your computer.

What to do:

Open the Scratch program to duplicate the map maze and remain its manemap2, next, change the color of lines in the new map from blue to red. Add scripts such that the games become a multi-level game with 2 distinct images.

Q4. Take a 4-digit number as input for a year and check if the year is a leap year or not. Display your output as: the year 1979 is not a leap year or the year 2020 is a leap year.

Ans:

program:

# Python program to check if the year is a leap year or not 
Year = 1979 and 2020

# To get the year (integer input) from the user
# year = int (input (“Enter a year: “))

# Divided by 100 means century year (ending with 00)
# Century year divided by 400 is a leap year 
If (year % 400 == 0) and (year % 100 == 0) : 
        Print (“{0} is a leap year”. Format(year))

# Not divided by 100 means, not a century year
# year divided by 4 is a leap year 
elif (year % 4 == 0) and (year % 100 != 0) :
        Print (“{0} is a leap year”. Format(year))

# if not divided by both 400 (century year) and 4 (not century year)
# Year is not leap year 

Else: 
        Print (“{0} is not a leap year”. Format (year))

Output:
1979 is not a leap year
2020 is a leap year

Q5. Take length and width as input from the user for a quadrilateral and check if it is a square or rectangle.

Ans:

1    class Rectangle():

2        def __init__(self, l, w):

3            self.length = l

4            self.width  = w

5

6        def rectangle_area(self):

7            return self.length*self.width

8

9        newRectangle = Rectangle(12, 10)

10    print(newRectangle.rectangle_area())

Output:
Rectangle area 120

Q6. Write a program in python for the following output [print a star triangle].

Ans:

# Python 3.x code to demonstrate star pattern

 

# Function to demonstrate printing pattern triangle

def triangle(n):

     

    # number of spaces

    k = n - 1

 

    # outer loop to handle number of rows

    for i in range(0, n):

     

        # inner loop to handle number spaces

        # values changing acc. to requirement

        for j in range(0, k):

            print(end=" ")

     

        # decrementing k after each loop

        k = k - 1

     

        # inner loop to handle number of columns

        # values changing acc. to outer loop

        for j in range(0, i+1):

         

            # printing stars

            print("* ", end="")

     

        # ending line after each row

        print("\r")

 

# Driver Code

n = 5

triangle(n)

output:

             * 

           *  * 

         *  *  * 

       *  *  *  * 

     *  *  *  *  *

Q7. Write a program in python that display squares of the numbers and print in the form of a triangle.

Ans:

Program:

# Python 3.x code to demonstrate number pattern
# Function to demonstrate printing pattern of numbers
        def countnum(n):

       #initializing starting number
       Num = 1

# Outer loop to handle number of rows for i in range (0, n):
        # note re assigning num
        # num = 1

# inner loop to handle number of columns
       # values changing according to outer loop for j in range (0, i*i):
       #printing number
       Print(num, end=” “)

# Incrementing number at each column
       num=num*num

# ending line after each row
        Print(“\r”) n=5

# sending 5 as argument
        # calling function
        Countnum(n)

Output:
         1
      4    9
  16  25  36
49 64 81 100

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