1. While loop checks the condition and the loop keeps on running till the condition is true, it stops when the condition becomes false.
a) True
b) False
Answer
Answer: a [Reason:] While condition is true keep on looping.
2. What is the output of the given code?
counter = 1 while counter < 11 puts counter counter = counter + 1 end
a) Prints the number from 1 to 10
b) Prints the number from 1 to 11
c) Prints the number from 2 to 10
d) Infinite loop
Answer
Answer: a [Reason:] Counter value is initialized to 1 and it keeps on looping till the counter is less than 11.
Output: 1 2 3 4 5 6 7 8 9 10
3. What is the output of the given code?
counter = true while counter !=false puts counter end
a) True
b) False
c) Syntax error
d) Infinite loop
Answer
Answer: d [Reason:] Counter value is true in all cases hence true will be printed infinite times.
Output: true true ...Infinite loop
4. What is the output of the given code?
i = 0 while i < 5 puts i i=(i+1)**2 end
a) 1 2 3 4 5
b) 0 1 4
c) 0 1
d) 1 4
Answer
Answer: b [Reason:] (i+1)**2 means i+1 to the power of 2 and hence the loop continues till i<5.
Output: 0 1 4
5. What is the output of the given code?
a=5 b=15 while a&&b puts a+b end
a) 5..15
b) 20
c) Infinite loop
d) 5 15
Answer
Answer: c [Reason:] a && b will always be true so the looping will never come to an end.
Output: 20 20 ....infinite loop
6. What is the output of the given code?
a=5 b=15 while b>a puts a*(b-a) while a>b a+=1 b-=1 end end
a) 5..15
b) 50
c) Infinite loop
d) 5 50
Answer
Answer: c [Reason:] b>a will always be true so the looping will never come to an end and as a>b will always be false it will never enter the other while loop.
Output: 50 50 ....infinite loop
7. What is the output of the given code?
i = 3 while i > 0 do print i i -= 1 end
a) 3
b) 321
c) Infinite loop
d) 3 2 1 0
Answer
Answer: b [Reason:] The do statement here indicates that till the while condition is true execute the instructions.
Output: 321
8. What is the output of the given code?
i = 50 while i > 25 do print 50/i i -= 1 end
a) 50..25
b) 50..1
c) Infinite loop
d) 1111111111111111111111111
Answer
Answer: d [Reason:] The do statement here indicates that till the while condition is true execute the instructions, so here it will print all the integer values of (50/i) which
will always be one.
Output: 1111111111111111111111111
9. What is the output of the given code?
a = 5 b=10 while a<b do puts a*b a+=2 b-=2 end
a) 5 10
b) 50 56
c) Infinite loop
d) 5 6 7 8 9 10
Answer
Answer: b [Reason:] The do statement here indicates that till the while condition is true execute the instructions and will print a*b only till aOutput:
50
56
