Synonyms

Exchange fundamentally means to give one thing and receive another in return. Transplant means to remove and move something to another place, which involves the core concept of exchange - taking something from one place and putting it in another. While typically used in medical contexts, transplant captures the essence of exchange.

To test something means to verify or check if it works correctly. 'Verify' is the closest synonym among the options. 'Proof' is a noun (not a verb like test), 'Attempt' means to try but not necessarily verify, and 'Correct' means to fix rather than check.

'Rely on' and 'depend on' are perfect synonyms meaning to trust or count on someone or something. 'Carry on' means to continue, 'Attempt' means to try, and 'None of these' is incorrect since B matches.

'Unfaithful' means not trustworthy or loyal. 'Unreliable' is the closest match as it also means not dependable. 'Trip' is unrelated, 'Truth' is the opposite concept, and 'None of these' is incorrect.

'Autocracy' is a system of government by one person with absolute power. 'Dictatorship' is the correct synonym - both mean rule by a single leader. 'Anarchy' means no government (opposite), 'Converse' means opposite, and 'None of these' is incorrect.

'Rotation' involves circular movement or turning around an axis. 'Circulation' is the closest synonym as it also involves movement in a circular pattern. 'Repetition' means doing again, 'Strive' means to struggle, and 'Neglect' means to ignore.

'Indomitable' means impossible to defeat or subdue. 'Insurmountable' is the correct synonym meaning impossible to overcome. The other options are unrelated: 'Trade' (exchange), 'Agree' (concur), 'Tall' (height).

'Questionable' means open to doubt or suspicion. 'Doubtful' is the perfect synonym with the same meaning. 'Steady' and 'Regular' mean stable/consistent (opposites), and 'None of these' is incorrect.

'Infallible' means never wrong or incapable of failure. 'Unfailing' is the correct synonym meaning always reliable. 'Careful' means cautious (related but different), 'Soft' is texture, and 'Bully' means intimidator.

'Unquiet' means not calm or peaceful, often agitated. 'Disturbed' is the closest synonym meaning upset or troubled. 'Refuse' means to decline, 'Neutral' means unbiased, and 'None of these' is incorrect.

'Disinclined' means unwilling or lacking enthusiasm to do something. 'Reluctant' is the correct synonym with the same meaning. 'Rare' means uncommon, 'Warn' means to caution, and 'Loss' means deprivation.

'Beneficial' means producing good results or helpful. 'Helpful' is the correct synonym meaning providing assistance. 'Misuse' and 'Abuse' mean to use wrongly (opposites), and 'Dumping' means discarding.

'Pressing' means urgent or requiring immediate attention. 'Important' is the closest synonym among the options. 'Warn' means to caution, 'Force' means compel, and 'None of these' is incorrect.

Treasure means something valuable or precious. Prize is the closest synonym among the options, as it also refers to something of great worth or value.

Unchangeable means something that cannot be altered or modified. Invariable is the correct synonym, meaning constant, steady, or unchanging.