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Q:

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative 

Assertion(A)    :    Increase in carbon dioxide would melt polar ice. 

Reason (R)      :    Global temperature would rise

A) Both A and R are true and R is the correct explanation of A. B) Both A and R are true but R is NOT the correct explanation of A.
C) A is true but R is false. D) A is false but R is true.

Answer:   A) Both A and R are true and R is the correct explanation of A.



Explanation:

The carbon dioxide envelope in earth's atmosphere traps the heat. With increase in the proportion of carbon dioxide, therefore, the global temperature would rise, thus causing the polar ice to melt 

 

 

Q:

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative

Assertion (A) : An atom is neutral despite the charged particles in it. 

Reason (R) : The neutrons do not have any charge. 

A) Both A and R are true and R is the correct explanation of A. B) Both A and R are true but R is NOT the correct explanation of A.
C) A is true but R is false. D) A is false but R is true.
 
Answer & Explanation Answer: B) Both A and R are true but R is NOT the correct explanation of A.

Explanation:

An atom contains the positively charged protons and an equal number of negatively charged electrons So, it is neutral

 

 

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Q:

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative 

Assertion (A) : Carbon monoxide when inhaled causes death. 

Reason (R) : Carbon monoxide combines with haemoglobin. 

A) Both A and R are true and R is the correct explanation of A. B) Both A and It are true but R is NOT the correct explanation of A.
C) A is true but R is false. D) A is false but R is true.
 
Answer & Explanation Answer: A) Both A and R are true and R is the correct explanation of A.

Explanation:

Carbon monoxide, when inhaled, combines with haemoglobin of blood to form carboxyhaemoglobin which inhibits the transport of oxygen. 

 

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