Verbal Reasoning - Mental Ability Questions

Find the missing number ?

In a certain code language, “MOTOR” is written as “ORXTX”. How is “GUARD” written in that code language?

MATHEMATICS is related to NUMBERS in the same way HISTORY is related to

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?

12 x 6 ÷ 5 + 4 = ?

In a certain code language, 'x' represents '+', '÷' represents 'x', '-' represents '÷' and '+' represents '-'. Find out the answer to the following question.

18 - 2 + 20 x 10 ÷ 4 = ?

If A = 1 and OAR = 34, then ROAR =

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.

Troposphere, Stratosphere, Mesosphere, ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
Asia, Africa, North America, ?