Questions

Q:

Isobars are atoms of different chemical elements that have ______.

 

A) Same atomic number but different mass number B) Same mass number but different atomic number
C) Same mass number and same atomic number D) Different mass number and different atomic number  
 
Answer & Explanation Answer: B) Same mass number but different atomic number

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Q:

Which type of reaction occurs when carbon burns in oxygen to give carbo dioxide?

 

A) Addition reaction B) Substition reaction
C) Combustion reaction D) Decomposition reaction
 
Answer & Explanation Answer: C) Combustion reaction

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Q:

Which among the following statements are TRUE regarding synthetic fibre?

 

I. They melt after catching fire.

II. They are more durable.

III. They are prepared by a number of processes using petrochemicals.

 

A) Only I and II B) Only I and III
C) Only II and III D) All I, II and III
 
Answer & Explanation Answer: D) All I, II and III

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Q:

The movement of water molecules through the plasma membrane is called ______.

 

A) Osmosis B) Sedimentation
C) Precipitation D) Transpiration
 
Answer & Explanation Answer: A) Osmosis

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Q:

Generally covalently bonded molecules ______.

 

I. have high boiling and melting point as compare to ionically bonded molecules

II. poor conductors of electricity

III. have weak intermolecular force

 

A) Only I and II B) Only I and III
C) Only II and III D) All I, II and III
 
Answer & Explanation Answer: C) Only II and III

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Q:

If V/I is a constant, it is called:

 

A) Potential difference B) Current
C) Coulomb D) Resistance
 
Answer & Explanation Answer: D) Resistance

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Q:

Who first discovered the every eighth element had properties similar to that of the first?

 

A) Newlands B) Moseley
C) Dobereiner D) Mendeleev
 
Answer & Explanation Answer: A) Newlands

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Q:

The gravitational force of attraction between two bodies is ____________________ the distance between the two bodies.

 

A) inversely proportional to the B) directly proportional to the square of  
C) inversely proportional to the square of   D) directly proportional to the
 
Answer & Explanation Answer: C) inversely proportional to the square of  

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