Fill in the blank with the correct preposition - 
Given below is the sentence in active voice. Choose the correct sentence given in passive voice among the alternatives. Ought you not to reveal the truth now?

In this question a disarranged sentence is given in which words or phrases are retrieved P, Q, R, S. You are to arrange these to form a meaning sentence.
Russia's test firing-
P: to US steps that have sparked an arms race
Q: of an intercontinental ballistic missile on
R: and undermined world security
S: Tuesday was in response

DIRECTIONS: In this question, select the related word/letters/number from the given alternatives.

$36:144:: 49:?$

DIRECTION: In this question, select the related word/letters/number from the given alternatives.

BDGJ: OQTW:: AFIM:?

DIRECTIONS: In the following question, four alternatives are given, out of which three are alike in a certain way while one is different. Choose the odd one. Find the wrong term in the letter-number series given below:

$\mathrm{G}4\mathrm{T}, \mathrm{J}10\mathrm{R}, \mathrm{M}20\mathrm{P}, \mathrm{P}43\mathrm{N}, \mathrm{S}90\mathrm{L}$

DIRECTIONS: In the following question, four alternatives are given, out of which three are alike in a certain way while one is different. Choose the odd one.

Find the missing character in the following figure.