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Q:

Which of the following is essential for the synthesis of thyroxin?

A) Potassium B) Calcium
C) Iodine D) Sodium
 
Answer & Explanation Answer: C) Iodine

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Q:

The strongest interactions between molecules of hydrogen chloride are

A) dipole-dipole interactions B) hydrogen bonds
C) covalent bonds D) ionic bonds
 
Answer & Explanation Answer: A) dipole-dipole interactions

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Q:

Epidermal cells of which part of plant often secrete a waxy water resistant layer on their outer surface

 

A) Aerial parts only B) Roots only
C) Both aerial parts and roots D) Neither aerial parts nor root
 
Answer & Explanation Answer: A) Aerial parts only

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Q:

A section of DNA that provides information for one protein is called the ___.

A) lysosome B) gene
C) chromosome D) nucleus
 
Answer & Explanation Answer: B) gene

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Q:

Nitrification is the biological process of converting

A) N2 into nitrate B) N2 into nitrite
C) Ammonia into nitrite D) Ammonia into N2
 
Answer & Explanation Answer: C) Ammonia into nitrite

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Q:

Why is Carbon Monoxide a pollutant ?

A) Reacts with haemoglobin B) Makes nervous system inactive
C) It reacts with Oxygen D) It inhibits glycolysis
 
Answer & Explanation Answer: A) Reacts with haemoglobin

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Q:

Glass is also called ________.

A) Supercooled liquid B) Super liquid
C) Ideal liquid D) Distilled liquid
 
Answer & Explanation Answer: A) Supercooled liquid

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Q:

Which of the following elements has the lowest melting point?

A) Platinum B) Carbon
C) Cobalt D) Krypton
 
Answer & Explanation Answer: D) Krypton

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