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Q:

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

Assertion (A) : a Vaccines prevent diseases. 

Reason (R)    : Vaccines must be given to children. 

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



Explanation:

Vaccines prevent diseases by developing immunity inside the body and vaccines must be given to children to build in them a resistance against diseases. 

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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