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Q:

What is the Greenhouse Effect?

A) The fall in population of plants due to human activity B) It is the warming of earth's surface due to its atmosphere
C) The polluting effect of burning fossil fuels D) The heating of the atmosphere due to depletion of the ozone layer
 
Answer & Explanation Answer: B) It is the warming of earth's surface due to its atmosphere

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Q:

Which of the following meals is NOT obtained by reduction using carbon?

A) Copper B) Sodium
C) Iron D) Zinc
 
Answer & Explanation Answer: B) Sodium

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Q:

Which one of the following elements has the lowest atomic mass?

A) Lithium B) Nitrogen
C) Hydrogen D) Helium
 
Answer & Explanation Answer: C) Hydrogen

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Q:

What is the number of atoms constituting a molecule known as?

A) Atomicity B) Atomic mass
C) Atomic number D) Isotopes
 
Answer & Explanation Answer: A) Atomicity

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Q:

The number of valence electrons in an atom of Phosphorous is

A) 4 B) 3
C) 2 D) 5
 
Answer & Explanation Answer: D) 5

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Q:

Which of the following causes damage to bridges, iron railings and all objects made of metals?

A) Reduction B) Rancidity
C) Acidity D) Corrosion
 
Answer & Explanation Answer: D) Corrosion

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Q:

Which of the following is false?

A) Hydrogen atom is roughly a third of the mass of tritium B) Deuterium is called heavy hydrogen
C) Deuterium atom has 1 neutron D) Protium is the rarest isotope of hydrogen
 
Answer & Explanation Answer: D) Protium is the rarest isotope of hydrogen

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Q:

The state of matter can be changed into another state by changing the

A) Volume B) Density
C) Shape D) Temperature
 
Answer & Explanation Answer: D) Temperature

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