Monarchy = the rule by a king or queen.

Autocracy = a system of government in which a person or party has uncontrolled power.

Anarchy = the lack of government control or rule or law.

Dictatorship = a system of government in which a person or small groups of people has absolute power.

Hence, option C is the correct answer.

• The error is in the usage of verb.

• Advice is an uncountable noun.

• So, the use of 'an' is uncalled for in this case.

• Thus, remove the article "an" to make the sentence grammatically correct.

Let’s first see the meanings of the words:

Authenticated= prove or show (something) to be true, genuine, or valid.

True= in accordance with fact or reality.

Certified= officially recognized as possessing certain qualifications or meeting certain standards.

Unauthenticated= not proven or validated.

• “Fall prey to someone/something” means to be influenced by someone or something.
  
  
• We need a negative adjective here.
  
  
• Hence, "unauthenticated" is the appropriate word for the blank. 

Pattern is:

B+5=G

G+3=J

J+5=O

O+3=R

R+5=W

W+3=Z

Z+5=E

E+3=H

H+5=M

Hence, option C is the correct answer.

The pattern is:

Similarly,

Hence, option A is correct answer.

A is opposite F and third to the right of B.

G is between F and D.

E is between C and A.

H is to the left of D. so, final arrangement is:

so, B is sitting opposite H.

Hence, option A is the correct answer.

Cumulative discount of 20% and 20%

Difference

N₁ × d₁ = N₂ × d₂

N × 15 = (N-2) × 25

10N = 50

N = 5

* Total internal reflection is the optical phenomenon in which waves arriving at the interface from one medium to another are not refracted into the second medium, but completely reflected back into the first medium.

* Some examples of total internal reflection in daily life are the formation of a mirage, shining of empty test-tube in water, shining of crack in a glass-vessel, sparkling of a diamond, transmission of light rays in an optical fibre, etc.

* The phenomenon of total internal reflection of light is used in many optical instruments like telescopes, microscopes, binoculars, spectroscopes, periscopes etc. The brilliance of a diamond is due to total internal reflection.

Hence, option C is the correct answer.

● Indian Opinion newspaper was founded by Mahatma Gandhi in South Africa in 1903.

● It was an important tool for the political movement and It existed between 1904 and 1915.

● It was a means of bringing news about Indians in the colonies before the public in India.

● Young India was a weekly paper or journal in English started by Mahatma Gandhi.

● Swaraj Hind is a book written by Mohandas K. Gandhi in 1909.

● Navjivan India is an Indian newspaper published by The Associated Journals Ltd.