Questions

Q:

Dry ice is an example of which process

A) Condensation B) Evaporation
C) Sublimation D) Freezing
 
Answer & Explanation Answer: C) Sublimation

Explanation:

Sublimation is a process when a solid changes directly into gas instead changing into liquid first. Dry ice is an example of Sublimation process because it doesn't change into liquid CO2 and directly change into gaseous CO2 when heated.

 

Hence, Dry ice is an example of Sublimation process. 

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Q:

When a piece of pure silicon is doped with aluminium, then

A) the conductivity of the doped silicon piece will remain the same B) the doped silicon piece will become n-type
C) the doped silicon piece will become p-type D) the resistivity of the doped silicon piece will increase
 
Answer & Explanation Answer: C) the doped silicon piece will become p-type

Explanation:

p type of semiconductor is obtained when Silicon is doped with a trivalent impurity like Aluminium. Aluminium is a p-type dopant, which means that when a semiconductor i.e. silicon is doped with aluminium, it creates a hole (positively charged carrier) by accepting an electron from the silicon atom. Electrical conductivity of semiconductors increasesand resistivity remains the same

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Q:

Which is Largest railway route in India ?

Answer



Dibrugarh in Assam to Kannyakumari in Tamil Nadu.


 

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Q:

Water is an excellent solvent because

Answer

Water is capable of dissolving a variety of different substances, which is why it is such a good solvent.

And, water is called the "universal solvent" because it dissolves more substances than any other liquid

It means that wherever water goes, either through the ground or through our bodies, it takes along valuable chemicals, minerals, and nutrients

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Q:

Red data book contains data of which of the following?

A) All plant species B) All animal species
C) All endangered species D) All extinct species
 
Answer & Explanation Answer: C) All endangered species

Explanation:
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Q:

City with most Bridges in the world is _________

Answer

Hamburg, Germany, is located on the river Elbe at the point where it meets the Bille and Alster rivers. The canals, rivers and streams within the city are crossed by a total of 2,302 bridges-more than the cities of Vanice and Amsterdam combined.

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Q:

World's oldest living man 2018?

A) Masazo Nonaka B) Francisco Nunez Olivera
C) Juan Pablo Villalos D) Les Colley
 
Answer & Explanation Answer: A) Masazo Nonaka

Explanation:

According to Guiness World Records, the world's oldest living man Masazo Nonaka has turned 113 years on 25 July of 2018 in Japan's Hokkaido.

world_oldest_man1532609412.jpg image 

 

Francisco Nunez Olivera was the former oldest person who died on 29th of January 2018 at the age of 112 years.

 

Les Colley (1898 - 1998, Australia), is the oldest ever man to father a child. He had his ninth child a son named Oswald to his third wife at the age of 92 years 10 months.

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Q:

Which of the following is not an aerobic outdoor sport?

A) Hiking B) Swimming
C) Skydiving D) Cycling
 
Answer & Explanation Answer: C) Skydiving

Explanation:

Except skydiving all other given options swimming, hiking and cycling are aerobic outdoor sports.

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