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Q:

Dust particles in the air of large industrial cities are removed by 

A) Sedimentation B) Electrophoresis
C) Tyndall effect D) Brownian movement
 
Answer & Explanation Answer: B) Electrophoresis

Explanation:

Dust particles such as coal dust(smoke) are fine particle of a solid (carbon in the case of smoke) dispersed in air. They are colloidal systems and the particles are charged either positive or negative. In an applied electrical field, they are attracted towards the opposite electrodes. Movement of the particles towards the electrodes is known as 'electrophoresis'. Hence electrophoresis is applied to remove smoke within the chimeny itself without allowing it to escape into the air and cause nuisance.

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Filed Under: Chemistry

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Q:

"Kargil Vijay Diwas" was observed on _____.

A) 26 July B) 27 July
C) 25 July D) 29 July
 
Answer & Explanation Answer: A) 26 July

Explanation:
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Filed Under: Important Days and Years
Exam Prep: AIEEE , Bank Exams , CAT
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Q:

A container contains 165 litres of milk. Some quantity of milk is taken out and half of that quantity of milk, water is added in the container. Now ratio of milk to water in the container becomes 5:3. What is the quantity of water added in it?

A) 40 litre B) 45 litre
C) 60 litre D) 30 litre
 
Answer & Explanation Answer: B) 45 litre

Explanation:

Let amount of milk removed = 2x litre
So, amount of water added = x litre
Now → (165 − 2x)/x = 5/3
x = 45 lit

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Filed Under: Quantitative Aptitude - Arithmetic Ability
Exam Prep: Bank Exams , GATE

8 3666
Q:

The capital of Colombia is ?

A) Caracas B) Santiago
C) Lima D) Bogota
 
Answer & Explanation Answer: D) Bogota

Explanation:
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Filed Under: World Geography
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Q:

Generally speaking, novels have

A) multiple settings B) limited characters
C) no resolutions D) single themes
 
Answer & Explanation Answer: A) multiple settings

Explanation:
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Filed Under: English
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3 3665
Q:

Which one of the following is not true for minerals?

A) they can be a liquid, solid, or glass B) they can be identified by characteristic physical properties
C) they have a specific, internal, crystalline structure D) they have a specific, predictable chemical composition
 
Answer & Explanation Answer: A) they can be a liquid, solid, or glass

Explanation:

A mineral is a naturally occurring, inorganic solid, with a definite chemical composition. They cannot be in liquid or gas state. They exists only in solid state.

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Filed Under: Chemistry
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3 3664
Q:

Great Mosque of Cordoba is located in which country?

A) Colombia B) Spain
C) Argentina D) Chile
 
Answer & Explanation Answer: B) Spain

Explanation:
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Filed Under: Famous Places

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Q:

The black flag signifies

the_black_flag_signifies1553164164.png image

A) protest B) danger
C) peace D) troop
 
Answer & Explanation Answer: A) protest

Explanation:

The black flag signifies a protest.

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Filed Under: General Awareness
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