Unit-1 Computational Thinking

Which of the following is a valid reason for giving variables meaningful names in a program?

• A programmer will find it easier to read and understand the code since they will know what the variables represent.

• The compiler will be able to parse the code faster since it will know the purpose of each variable.

• The memory required to store the variables will be reduced as the possible values which can be stored by each variable can be determined from their names.

• The code will run with fewer errors since the CPU can interpret what the variable represents from its name.

Which of the following describes good practice when naming variables in code?

1. Use names which contain as few different characters to aid the compiler and shorten compile times
2. Use names which show in what order the variables were introduced to make it easier to find the value of a variable
3. Use names which describe what each variable represents to make code easier to understand
4. Use concise names to avoid typos and keep code tidier

• All of the above

• 2, 3 & 4 only

• 3 & 4 only

• 2 & 4 only

Q. Which of the 4 computational thinking skills are required to complete the following task?: You and your family are planning a road trip through all of the capitals in the Europe and you have the job of figuring out the shortest route possible to save on the cost of fuel.

• Algorithm Design

• Decomposition

• Pattern Recognition

• Abstraction

Q. What is the minimum number of bits you would need to encode the 26 letters of the alphabet plus a space -- for a total of 27 characters?

• 5 bits

• 10 bits

• 9 bits

• 27 bits

8 bits is enough to represent 256 different numbers. How many total bits do you need to represent 512 (twice as many) numbers?

• 9 bits

• 17 bits

• 10 bits

• 16 bits

• move 10 steps then stop

• broadcast RUN when distance is close

• make sprite run when distace is close

• glitch out

The following incomplete algorithm appears in a Scratch script for a sprite, and is intended to draw a rectangle.

• 
• 
• 
• 

Consider the following code segment, which is attached to a sprite in a Scratch program:

Suppose this Scratch program is run, and the user types 3 in response to the first question, and 5 in response to the second question. What number does the sprite say at the end of this script?

• No answer text provided.

• 8

• 6

• 10

A statistics teacher wishes to create a program on her calculator that generates a random even integer. The command built in the calculator to generate a random positive integer is RANDOM(a,b). This command generates a random integer between integers a and b (and including a and b). Which of the following lines of code will ensure that the random integer generated will be even?

• RANDOM(a,b) - 2

• RANDOM(a,b) + 1

• RANDOM(a,b) + 2

• RANDOM(a,b) * 2

Which of the following should be true of any algorithm?

I. The order in which the steps making up the algorithm are followed is logically determined

II. Following the instructions in the algorithm will always result in the same outputs, regardless of any inputs

III. The instructions in the algorithm contain all necessary information to be implemented

• I, II and III

• II and III only

• I and III only

• I only