Olympiad Test: Odd One Out -1

# Olympiad Test: Odd One Out -1

Test Description

## 20 Questions MCQ Test Science Olympiad Class 7 | Olympiad Test: Odd One Out -1

Olympiad Test: Odd One Out -1 for Class 7 2023 is part of Science Olympiad Class 7 preparation. The Olympiad Test: Odd One Out -1 questions and answers have been prepared according to the Class 7 exam syllabus.The Olympiad Test: Odd One Out -1 MCQs are made for Class 7 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Olympiad Test: Odd One Out -1 below.
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Olympiad Test: Odd One Out -1 - Question 1

### Directions: Find the odd one out. 3, 5, 7, 12, 17, 19

Detailed Solution for Olympiad Test: Odd One Out -1 - Question 1

Each of the numbers is a prime number except 12.

Olympiad Test: Odd One Out -1 - Question 2

### Directions: Find the odd one out. 41, 43, 47, 53, 61, 71, 73, 81

Detailed Solution for Olympiad Test: Odd One Out -1 - Question 2

Each of the numbers except 81 is a prime number.

Olympiad Test: Odd One Out -1 - Question 3

### Directions: Find the odd one out. 835, 734, 642, 751, 853, 981, 532

Detailed Solution for Olympiad Test: Odd One Out -1 - Question 3

In each number except 751, the difference of third and first digit is the middle one.

Olympiad Test: Odd One Out -1 - Question 4

Directions: Find the odd one out.

331, 482, 551, 263, 383, 362, 284

Detailed Solution for Olympiad Test: Odd One Out -1 - Question 4

In each number except 383, the product of first and third digits is the middle one.

Olympiad Test: Odd One Out -1 - Question 5

Directions: Find the odd one out.

16, 25, 36, 72, 144, 196, 225

Detailed Solution for Olympiad Test: Odd One Out -1 - Question 5

Each of the numbers except 72 is a perfect square.

Olympiad Test: Odd One Out -1 - Question 6

Directions: Find the odd one out.

2, 5, 10, 17, 26, 37, 50, 64

Detailed Solution for Olympiad Test: Odd One Out -1 - Question 6

(1 × 1) + 1, (2 × 2) + 1, (3 × 3) +1, (4 × 4) + 1,
(5 × 5) + 1, (6 × 6) + 1, (7 × 7) + 1, (8 × 8) + 1
But, 64 is out of pattern.

Olympiad Test: Odd One Out -1 - Question 7

Directions: Find the odd one out.

582, 605, 588, 611, 634, 617, 600

Detailed Solution for Olympiad Test: Odd One Out -1 - Question 7

Alternatively 23 is added and 17 is subtracted from the terms. So, 634 is wrong.

Olympiad Test: Odd One Out -1 - Question 8

Directions: Find the odd one out.

56, 72, 90, 110, 132, 150

Detailed Solution for Olympiad Test: Odd One Out -1 - Question 8

The numbers are 7 x 8, 8 x 9, 9 x 10, 10 x 11, 11 x 12, 12 x 13.
So, 150 is wrong.

Olympiad Test: Odd One Out -1 - Question 9

Directions: Find the odd one out.

36, 54, 18, 27, 9, 18.5, 4.5

Detailed Solution for Olympiad Test: Odd One Out -1 - Question 9

The terms are alternatively multiplied by 1.5 and divided by 3. However, 18.5 do not satisfy it.

Olympiad Test: Odd One Out -1 - Question 10

Directions: Find the odd one out.

6, 13, 18, 25, 30, 37, 40

Detailed Solution for Olympiad Test: Odd One Out -1 - Question 10

The differences between two successive terms from the beginning are 7, 5, 7, 5, 7, 5.
So, 40 is wrong.

Olympiad Test: Odd One Out -1 - Question 11

Directions: Find the odd one out.

46080, 3840, 384, 48, 24, 2, 1

Detailed Solution for Olympiad Test: Odd One Out -1 - Question 11

The terms are successively divided by 12, 10, 8, 6, ...etc.
So, 24 is wrong, it should be 8 (48/6 = 8).

Olympiad Test: Odd One Out -1 - Question 12

Directions: Find the odd one out.

7, 8, 18, 57, 228, 1165, 6996

Detailed Solution for Olympiad Test: Odd One Out -1 - Question 12

Let the given numbers be A, B, C, D, E, F, G.
Then, A, A x 1 + 1, B x 2 + 2, C x 3 + 3, D x 4 + 4, E x 5 + 5, F x 6 + 6 are the required numbers.
Clearly, 228 is wrong.

Olympiad Test: Odd One Out -1 - Question 13

Directions: Find the odd one out.

190, 166, 145, 128, 112, 100, 91

Detailed Solution for Olympiad Test: Odd One Out -1 - Question 13

Go on subtracting 24, 21, 18, 15, 12, 9 from the numbers to get the next number.
190 – 24 = 166
166 – 21 = 145
145 – 18 = 127 [Here, 128 is placed instead of 127] 127 – 15 = 112
112 – 12 = 100 ... and so on.
Therefore, 128 is wrong.

Olympiad Test: Odd One Out -1 - Question 14

Directions: Find the odd one out.

445, 221, 109, 46, 25, 11, 4

Detailed Solution for Olympiad Test: Odd One Out -1 - Question 14

Go on subtracting 3 and dividing the result by 2 to obtain the next number.
Clearly, 46 is wrong.

Olympiad Test: Odd One Out -1 - Question 15

Directions: Find the odd one out.

196, 169, 144, 121, 100, 80, 64

Detailed Solution for Olympiad Test: Odd One Out -1 - Question 15

Numbers must be (14)2, (13)2, (12)2, (11)2, (10)2, (9)2, (8)2.
So, 80 is wrong.

Olympiad Test: Odd One Out -1 - Question 16

Directions: Find the odd one out.

3, 7, 15, 27, 63, 127, 255

Detailed Solution for Olympiad Test: Odd One Out -1 - Question 16

Go on multiplying the number by 2 and adding 1 to it to get the next number.
So, 27 is wrong.

Olympiad Test: Odd One Out -1 - Question 17

Directions: Find the odd one out.

2880, 480, 92, 24, 8, 4, 4

Detailed Solution for Olympiad Test: Odd One Out -1 - Question 17

Go on dividing by 6, 5, 4, 3, 2, 1 respectively to obtain the next number.
Clearly, 92 is wrong.

Olympiad Test: Odd One Out -1 - Question 18

Directions: Find the odd one out.

10, 26, 74, 218, 654, 1946, 5834

Detailed Solution for Olympiad Test: Odd One Out -1 - Question 18

2nd term = (1st term) × 3 – 4 = 10 × 3 – 4 = 26
3rd term = (2nd term) × 3 – 4 = 26 × 3 – 4 = 74
4th term = (3th term) × 3 – 4 = 74 × 3 – 4 = 218
5th term = (4th term) ×3 – 4 = 218 × 3 – 4 = 650.
5th term must be 650 instead of 654.

Olympiad Test: Odd One Out -1 - Question 19

Directions: Find the odd one out.

15, 16, 34, 105, 424, 2124, 12576

Detailed Solution for Olympiad Test: Odd One Out -1 - Question 19

2nd term = (1st term) x 1 + 1 = 15 x 1 + 1 = 16
3rd term = (2nd term) x 2 + 2 = 16 x 2 + 2 = 34
4th term = (3th term) x 3 + 3 = 34 x 3 + 3 = 105.
5th term = (4th term) x 4 + 4 = 105 x 4 + 4 = 424
6th term = (5th term) x 5 + 5 = 424 x 5 + 5 = 2125
6th term should 2125 instead of 2124.

Olympiad Test: Odd One Out -1 - Question 20

Directions: Find the odd one out.

64, 71, 80, 91, 104, 119, 135, 155

Detailed Solution for Olympiad Test: Odd One Out -1 - Question 20

Go on adding 7, 9, 11, 13, 15, 17, 19 respectively to obtain the next number.
So, 135 is wrong.