Question : Select the option that expresses the given sentence in passive voice.

The Mesopotamians invented the decimal system.

Option 1: The decimal system was invented by the Mesopotamians.

Option 2: The decimal system is invented by the Mesopotamians.

Option 3: The decimal system is an invention of the Mesopotamians.

Option 4: The decimal system has been invented by the Mesopotamians.

Question : Which of the following is not an operating system?

Option 1: Android

Option 2: Vista

Option 3: iOS

Option 4: Opera

Question : Which one among the following is a main system board of a computer?

Option 1: CPU

Option 2: Keyboard

Option 3: Microchip

Option 4: Mother board

Question : If $a^{3}+\frac{1}{a^{3}}=2$, then the value of $\frac{a^{2}+1}{a}$ is ($a$ is a positive number):

Option 1: 1

Option 2: 2

Option 3: 3

Option 4: 4

Question : Directions: In the following question, some parts of the sentence have errors, and some are correct. Find out which part of the sentence has an error. The number of that part is the answer. If a sentence is error-free, your answer is "No Error".

Excess energy intake from (1) / food may fuel the (2) / growth of several cancers. (3) / No Error (4)

Option 1: (1)

Option 2: (2)

Option 3: (3)

Option 4: (4)