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Q:

Iron and manganese present as pollutants in water cannot be removed by_____

A) oxidation followed by settling and filtration B) chlorination
C) ion exchange process D) lime soda process or manganese zeolite process
 
Answer & Explanation Answer: B) chlorination

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Q:

The common name of lead (II) sulphide is

A) borax B) epsom salt
C) galena D) brimstone
 
Answer & Explanation Answer: C) galena

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Q:

Process of loosing electrons is known as _____.

A) oxidation B) reduction
C) radiation D) both oxidation and reduction
 
Answer & Explanation Answer: A) oxidation

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Q:

______________ is a multibranched polysaccharide of glucose that serves as a form of energy storage in animals and fungi.

A) B) Glycogen
C) Pectin D) Chitin
 
Answer & Explanation Answer: B) Glycogen

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Q:

Which one of the following is a good electrical conductor?

A) Graphite B) Diamond
C) Peat D) Charcoal
 
Answer & Explanation Answer: A) Graphite

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Q:

Which   one   of   the   following   is   not   a semiconductor?

A) Silicon B) Germanium
C) Quartz D) Gallium arsenide
 
Answer & Explanation Answer: C) Quartz

Explanation:

Semiconductors are the basic materials used in the present solid state electronic devices like diode, transistor, ICs, etc. 2. Lattice structure and the atomic structure of constituent elements decide whether a particular material will be insulator, metal or semiconductor. Semiconductors are elemental (Si, Ge) as well as compound (GaAs, CdS, etc.). Silicon, Germanium, Gallium Arsenide are semiconductors, but Quartz is an insulator.

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Q:

Chromite is an ore/mineral of

A) Zinc B) Uranium
C) Chromium D) Titanium
 
Answer & Explanation Answer: C) Chromium

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Q:

What is contained in Chlorophyll ?

A) sodium B) potassium
C) manganese D) magnesium
 
Answer & Explanation Answer: D) magnesium

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