1
Q:

With reference to mental and matai with reference to metals and their ores, which of the following pairs is INCORRECT?

 

A) Aluminium (Al) - Cryolite B) Mercury (Hg) - Greenockite
C) Cobalt (Co) - Smelite D) Gold (Au) - Calaverite

Answer:   B) Mercury (Hg) - Greenockite



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Subject: Chemistry
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Q:

_______ are stable, negatively charged particles found in all atoms.

 

A) Neutrons B) Photons
C) Electrons D) Protons
 
Answer & Explanation Answer: C) Electrons

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0 132
Q:

Rusting of iron is an example of _______.

 

A) corrosion B) combustion
C) evaporation D) condensation
 
Answer & Explanation Answer: A) corrosion

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0 375
Q:

_______ gas gives an orange glow when electricity is passed through it. It is generally used in fluorescent lighting.

 

A) Hydrogen B) Oxygen
C) Nitrogen D) Neon
 
Answer & Explanation Answer: D) Neon

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0 170
Q:

What is the chemical name of slaked lime?

 

A) Madhya Pradesh B) Rajasthan
C) Jammu and Kashmir D) Punjab
 
Answer & Explanation Answer: C) Jammu and Kashmir

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Q:

________ is the process by which water vapor in the air is changed into liquid water.

 

A) Decantation B) Condensation
C) Evaporation D) Precipitation
 
Answer & Explanation Answer: B) Condensation

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0 900
Q:

Flower colours of red, pink, blue and purple come mainly from pigments called _______.

 

A) Anthocyanins B) Carotenoids
C) Chlorophyll D) Lycopene
 
Answer & Explanation Answer: A) Anthocyanins

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Q:

_______ is one of the liquids commonly used in liquid-in-glass thermometers.

 

A) Liquid nitrogen B) Water
C) Alcohol D) Liquid hydrogen
 
Answer & Explanation Answer: C) Alcohol

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Q:

Which of the following is not a natural greenhouse gas?

 

A) Carbon dioxide B) Nitrogen
C) Methane D) Water vapour
 
Answer & Explanation Answer: B) Nitrogen

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