Question : The actinide series is a group of ______ metallic chemical elements.

Option 1: 12

Option 2: 15

Option 3: 9

Option 4: 18

Question : Directions: Which of the following numbers will replace the question mark (?) in the given series?
–15, –9, –3, 3, 9, 15, ?

Option 1: 24

Option 2: 30

Option 3: 21

Option 4: 18

Question : What is the total number of periods and groups in the Modern Periodic Table?

Option 1: Period:9 Group:7

Option 2: Period:18 Group:7

Option 3: Period:7 Group:9

Option 4: Period:7 Group:18

Question : Directions: Which two numbers should be interchanged to make the given equation correct?
9 + 30 × 15 – 18 ÷ 6 = 274

Option 1: 18 and 9

Option 2: 30 and 18

Option 3: 15 and 18

Option 4: 9 and 30

Question : If x : y : z = 2 : 3 : 4, then what is the value of 7x : 3y : 2z?

Option 1: $14:9:8$

Option 2: $18:7:12$

Option 3: $12:6:11$

Option 4: $16:9:8$

Question : Directions: In the following question a series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.
56, 42, 30, 20, ?, 6

Option 1: 15

Option 2: 12

Option 3: 18

Option 4: 14