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Logic Building - Phase 4: Basic Arrays

Practice array operations, searching, counting, and transformation logic

50 questions•5 pages•~75 min

Progress: 0 / 500%

Page 1 of 5 • Questions 1-10 of 50

Q1easy

What will be the output? arr = [10, 20, 30] print(arr[1])

A)10

B)20

C)30

D)Error

Q2easy

What does this code do? arr = [5, 2, 8, 1, 9] max_val = arr[0] for num in arr: if num > max_val: max_val = num

A)Finds minimum

B)Finds maximum

C)Sorts array

D)Reverses array

Q3medium

What will be the result? arr = [1, 2, 3, 4, 5] sum = 0 for i in range(len(arr)): if i % 2 == 0: sum += arr[i]

A)9

B)6

C)15

D)12

Q4easy

What is the output?

arr = [1, 2, 3]
arr.append(4)
print(len(arr))

A)3

B)4

C)5

D)Error

Q5medium

What does this code check? arr = [1, 2, 3, 2, 4] for i in range(len(arr)): if arr[i] == 2: print(i) break

A)Finds all occurrences of 2

B)Finds first occurrence of 2

C)Counts occurrences of 2

D)Removes all 2s

Q6easy

What will be printed? arr = [1, 2, 3, 4, 5] print(arr[-1])

A)1

B)5

C)4

D)Error

Q7easy

What is the output?

arr = [10, 20, 30]
arr[1] = 25
print(arr)

A)[10, 20, 30]

B)[10, 25, 30]

C)[25, 20, 30]

D)Error

Q8easy

What will be printed? arr = [5, 2, 8, 1, 9] min_val = min(arr) print(min_val)

A)1

B)2

C)5

D)9

Q9medium

What does this code do? arr = [1, 2, 3, 4, 5] result = [x * 2 for x in arr]

A)Doubles each element

B)Squares each element

C)Reverses array

D)Sorts array

Q10medium

What is the output?

arr = [1, 2, 3]
arr.append(4)
arr.insert(0, 0)
print(arr)

A)[0, 1, 2, 3, 4]

B)[1, 2, 3, 4, 0]

C)[4, 0, 1, 2, 3]

D)[0, 4, 1, 2, 3]

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