100+ Assertion and Reason Questions with Answers Pdf - 1
Question: 1
Assertion (A) : Passengers in a boat are not allowed to stand.
Reason (R) : This may raise the centre of gravity of the boat .
(A) A is true but R is false.
(B) A is false but R is true.
(C) Both A and R are false.
(D) Both A and R are true but R is not the correct explanation of A.
(E) Both A and R are true and R is the correct explanation of A.
Ans: E
R fully explains A.
Question: 2
Assertion (A) : Graphite is slippery and used as a lubricant.
Reason (R) : Graphite has free electrons.
(A) Both A and R are true but R is not the correct explanation of A.
(B) Both A and R are true and R is the correct explanation of A.
(C) A is false but R is true.
(D) A is true but R is false.
(E) Both A and R are false.
Ans: A
Graphite possesses a layer structure with two successive layers held by weak forces and able to slide over one another.
So, graphite is slippery and this property finds its use as a lubricant.
In graphite, each carbon atom is linked to three carbon atoms while one electron in the carbon atom is delocalized. So, graphite has free electrons.
Question: 3
Assertion (A) : Telephone wires sag more in summer.
Reason (R) : They expand due to summer heat.
(A) A is true but R is false.
(B) A is false but R is true.
(C) Both A and R are false.
(D) Both A and R are true and R is the correct explanation of A.
(E) Both A and R are true but R is not the correct explanation of A.
Ans: E
The metal of telephone wires expands in summer and the wires become loose. So, they sag.
Question: 4
Assertion (A) : There is no vaccine for AIDS.
Reason (R) : The AIDS virus changes its genetic code.
(A) A is true but R is false.
(B) A is false but R is true.
(C) Both A and R are false.
(D) Both A and R are true and R is the correct explanation of A.
(E) Both A and R are true but R is not the correct explanation of A.
Ans: D
A vaccine contains the inactivated germs of the disease.
But the AIDS virus changes its genetic code and so on vaccine has been invented for it.
Question: 5
Assertion (A) : Bronze is used for making statues.
Reason (R) :Bronze is an alloy of copper and tin.
(A) Both A and R are true but R is not the correct explanation of A.
(B) Both A and R are true and R is the correct explanation of A.
(C) A is true but R is false.
(D) A is false but R is true.
(E) Both A and R are false.
Ans: A
Bronze is an alloy of copper and tin. It is resistant to corrosion and so it is used to make statues.
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