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1
Q:

In modern periodic table while going from top to bottom in a group ______.

 

A) size of an atom increases B) size of an atom decreases
C) ionisation energy of an atom increases D)  size and ionisation energy of an atom increases

Answer:   D)  size and ionisation energy of an atom increases



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Subject: Chemistry
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When ice cubes are made, the entropy of water

A) does not change B) decreases
C) increases D) may either increase or decrease depending on the process used
 
Answer & Explanation Answer: B) decreases

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Which of the following has pH value 7?

A) Pure Water B) H2SO4
C) Sodium Carbonate D) HCl
 
Answer & Explanation Answer: A) Pure Water

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Q:

Bronze is an alloy of

A) Copper & tin B) Copper & zinc
C) Copper & iron D) Iron & nickel
 
Answer & Explanation Answer: A) Copper & tin

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Q:

Nitrogen fixation is a process of

A) Assimilation of nitrate B) Utilisation of nitrogen gas
C) Conversion of organic nitrogen to proteins D) Conversion of molecular nitrogen to ammonia
 
Answer & Explanation Answer: C) Conversion of organic nitrogen to proteins

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Q:

Absolute Zero is defined as

A) The temperature at which all molecular motion ceases B) At which water boils at 298K
C) At which liquid Helium boils D) At which the volume becomes zero
 
Answer & Explanation Answer: A) The temperature at which all molecular motion ceases

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3 876
Q:

Of the following commonly used materials, the one that is not an alloy is

A) Steel B) Brass
C) Bronze D) Copper
 
Answer & Explanation Answer: D) Copper

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1 1182
Q:

Which method will be employed to test the hardness of water?

A) Boiling B) Distillation
C) Formation of lather with soap D) None of these
 
Answer & Explanation Answer: C) Formation of lather with soap

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2 1009
Q:

Alcohol is more volatile than water because _________ is lower than water

A) its boiling point B) its density
C) its viscosity D) its surface tension
 
Answer & Explanation Answer: A) its boiling point

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