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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:   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.

Subject: Chemistry
Q:

A ‘breath test’ used by traffic police to check drunken driving uses ____?

A) Turmeric on filter paper B) Silica gel coated with silver nitrate
C) potassium permanganate-sulphuric acid D) Potassium dichromatic-sulphuric acid
 
Answer & Explanation Answer: D) Potassium dichromatic-sulphuric acid

Explanation:
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Q:

The enzyme that converts glucose to ethyl alcohol is 

A) Maltase B) Zymase
C) Diastase D) Invertase
 
Answer & Explanation Answer: B) Zymase

Explanation:
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1 3
Q:

The presence or absence of hydroxy group on which carbon atom of sugar differentiates RNA and DNA ?

A) 4th B) 2nd
C) 3rd D) 1st
 
Answer & Explanation Answer: B) 2nd

Explanation:

RNA has hydroxy group attached at the 2nd C-atom while DNA does not.

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Q:

'Minamata' disease was caused by ?

A) Lead B) Mercury
C) Cadmium D) Zinc
 
Answer & Explanation Answer: B) Mercury

Explanation:
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3 38
Q:

Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides?

(1) 

(2) 

(3) 

(4) 

A) Option 1 B) Option 2
C) Option 3 D) Option 4
 
Answer & Explanation Answer: B) Option 2

Explanation:

While moving from left to right in periodic table basic character of oxide of elements will decrease.

and while descending in the group basic character of corresponding oxides increases.

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