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GATE Questions

A) TRUE | B) FALSE |

Explanation:

True, **Air is a Mixture**.

Air is considered as mixture for the following reasons ;

**1.** Air can be separated into its components like N2, O2 , Argon and CO2 by the process of fractional distillation of liquid air.

**2.** Air shows the properties of all the gases present in the atmosphere.

For example : Oxygen is good Supporter of combustion. Hence air also is good supporter of combustion.

**3.** Air does not have a fixed formula.

**4.** Air has a variable composition because air at different places contains different amount of gases.

**5.** Heat or Light energy is neither absorbed nor released when air is prepared physical by mixing required amount of gases .

**6.** Mixture does have fixed boiling Point. It holds good in case of liquid air.

A) Light | B) Sound |

C) Both are same | D) Can't be determined |

Explanation:

**Light** travels **Faster** than **Sound**.

**Light :**

**1.** Light doesn't require a medium to travel.

**2.** It travels in the vaccum with the speed of 1,86,000 miles per second.

**Sound:**

**1.** Sound rquire a medium.

**2.** It travels in the Air with the speed of 340 meters per second.

**3.** It travels Faster in Water than in Air.

**4.** It travels Faster in Steel than in Water.

A) The conference was only supposed to be an hour; however, it ran for nearly two and half hours. | B) The conference was only supposed to be an hour, however; it ran for nearly two and half hours. |

C) The conference was only supposed to be an hour. however, it ran for nearly two and half hours. | D) The conference was only supposed to be an hour; however it ran for nearly two and half hours. |

Explanation:

The correct punctuated sentence is **A**

The conference was only supposed to be an hour; however, it ran for nearly two and half hours.

A) 12.5% | B) 18.75% |

C) 16.55% | D) 17.80% |

Explanation:

Given that to find 15 of 80

=> What % of 80 is 15

Let it be 'p'

=> p% of 80 = 15

=> $\frac{\mathbf{p}\mathbf{}\mathbf{x}\mathbf{}\mathbf{80}}{\mathbf{100}}\mathbf{}\mathbf{=}\mathbf{}\mathbf{15}\phantom{\rule{0ex}{0ex}}\mathbf{\Rightarrow}\mathbf{p}\mathbf{}\mathbf{=}\mathbf{}\frac{\mathbf{15}\mathbf{}\mathbf{x}\mathbf{}\mathbf{100}}{\mathbf{80}}\phantom{\rule{0ex}{0ex}}\mathbf{\Rightarrow}\mathbf{p}\mathbf{}\mathbf{=}\mathbf{}\frac{\mathbf{1500}}{\mathbf{80}}\mathbf{}\mathbf{=}\mathbf{}\mathbf{18}\mathbf{.}\mathbf{75}$

Therefore, 15 is 18.75% of 80 => **18.75% of 80 = 15**

**Example::**

**Now, **in the similar way we can find** 15% of 80 =?**

**=> 15x80/100 = p**

**=> p = 4 x 3 = 12**

Therefore,** 15% of 80 = 12**

A) 429@6 | B) 4962@ |

C) 4692@ | D) 4926@ |

Explanation:

Pour - 4156 => P = 4, r = 6

Sware - 78269 => a = 2, e = 9

Clear - 3@926 => l = @

**=> Pearl = 4926@**

A) History | B) Leader |

C) Story | D) Nationalism |

Explanation:

Detailed description of a man's life is **Biography.**

Similarly, detailed description of a Nations is called **History.**

A) +6 | B) +2 |

C) -6 | D) -2 |

Explanation:

In ${\mathit{H}}_{\mathbf{2}}\mathit{S}{\mathit{O}}_{\mathbf{4}}$,

Hydrogen has a charge of **+2**, with each hydrogen has **+1**.

Oxygen has a charge of **-8,** with each oxugen has **-2.**

Total charge **= (2 - 8)** = **-6**

Therefore, the Oxidation number of Sulphur S is **'+6'** because to make the compound stable.