Python Class 7 Practice Questions SET 1 Answer Key – If Condition, Loops, Range & Programming Exercises

MULTIPLE CHOICE QUESTIONS

1. b. It executes code only if the condition is True
2. c. for
3. a. [2, 4, 6, 8]
4. b. break
5. c. while loop

FILL IN THE BLANKS

1. continue
2. Boolean (True/False)
3. 0
4. backwards / in reverse
5. single-pass (or one-time) loop

DESCRIPTIVE QUESTIONS

1. Break vs Continue
   • break → exits the loop completely.
   • continue → skips the current iteration and moves to the next.
   for i in range(1, 6): if i == 3: continue # skip 3 if i == 5: break # stop at 5 print(i) # Output: 1 2 4
2. Entry-controlled vs Exit-controlled
   • Entry-controlled: condition checked first, then body executes (e.g., Python’s while, for).
   • Exit-controlled: body executes at least once, then condition is checked (e.g., do-while in other languages).
   • Python’s while → entry-controlled loop.
3. If loop variable not updated
   • The condition may never change, causing an infinite loop.
   i = 1 while i < 5: # infinite loop because i never increments print(i)
4. Difference in range()
   • range(stop) → counts from 0 to stop-1.
   • range(start, stop, step) → more control with start, stop, and step.
     Example:
   range(5) → [0,1,2,3,4] range(2,10,2) → [2,4,6,8]
5. Indentation importance
   • Python uses indentation to define blocks. Incorrect indentation → error.
   if True: print("Hello") # ❌ Error: indentation required

PROGRAMMING QUESTIONS

1. Even numbers 1–50
   • for i in range(2, 51, 2):
   • print(i)
2. Sum until 0 entered
   • total = 0
   • while True:
   • num = int(input(“Enter a number (0 to stop): “))
   • if num == 0:
   • break
   • total += num
   • print(“Sum is:”, total)
3. Check prime number
   • num = int(input(“Enter a number: “))
   • if num > 1:
   • for i in range(2, num):
   • if num % i == 0:
   • print(“Not Prime”)
   • break
   • else:
   • print(“Prime”)
   • else:
   • print(“Not Prime”)
4. Count vowels in string
   • text = input(“Enter a string: “)
   • vowels = “aeiouAEIOU”
   • count = 0
   • for ch in text:
   • if ch in vowels:
   • count += 1
   • print(“Number of vowels:”, count)
5. Multiplication table
   • num = int(input(“Enter a number: “))
   • for i in range(1, 11):
   • print(num, “x”, i, “=”, num * i)