REASONING-QUIZ-7

MATHEMATICS REASONING QUIZ-7

Dear Readers,

As per analysis for previous years, it has been observed that students preparing for JEE MAINS find Mathematics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Mathematics due to their ENGINEERING background. 

Furthermore, sections such as Mathematics are dominantly based on theories, laws, numerical in comparison to a section of Engineering which is more of fact-based, Physics, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced. 

Q1. ~[p↔q] is

•  Tautology
•  Contradiction
•  neither (a) nor (b)
•  either (a) or (b)

Solution

Q2.The proposition (p→~p)∧(∼p→p) is a :

•  Tautology
•  Contradiction
•  Neither a tautology nor a contradiction
•  Tautology and contradiction

Solution
We have, p→∼p≅∼p∨∼p≅∼p and ∼p→p≅p∨p≅p ∴(p→∼p)∧(∼p→p)≅∼p∧p≅c

Q3.  Which of the following statement is a tautology

•   (∼q∧p)∧q
•  (∼q∧p)∧(p∧∼p)
•  (∼q∧p)∨(p∧∼p)
•  (p∧q)∧(∼(p∧q))

Solution

Q4. The contrapositive of (p∨q)→r is

•  ~r→(p∨q)
•  r→(p∨q)
•  ~r→(~p∧~q)
•  p→(q∨r)

Solution
Contrapositive of (p∨q)→r is ∼r→∼(p∨q)≡∼r→(∼p∧∼q)

Q5.p→q is logically equivalent to

•  p∧∼q
•  ∼p→∼q
•  ∼q→∼p
•  None of these

Solution
  We have p→q≅∼p∨q and,∼q→∼p≅∼(∼q)∨∼p≅q∨∼p≅∼p∨q≅p→q

Q6. Let p be the proposition Mathematics is interesting and let q be the proposition that Mathematics is difficult, then the symbol p∧q means

•  Mathematics is interesting implies that Mathematics is difficult
•  Mathematics is interesting implies and is implied by Mathematics is difficult
•  Mathematics is intersecting and Mathematics is difficult
•  Mathematics is intersecting or Mathematics is difficult

Solution
p∧q means Mathematics is interesting and Mathematics is difficult

Q7.∼[∼p∧(p⇔q)]≡

•  p∨q
•  q∧p
•  T
•  F

Q8.Let p and q be two statement, then (p∨q)∨~p is

•  Tautology
•  Contradiction
•  Both (a) and (b)
•  None of these

Solution

Q9.Some triangles are not isosceles. Identify the Venn diagram

•  
• 
  
  
•  
• 
  
  
•  
• 
  
  
•  
• 
  
  

Solution

Q10. Which of the following not a statement in logic? 

 1. Earth is planet. 

 2. Plants are living objects. 

 3. √(-3)is a rational number. 

 4. x²-5x+6<0 when x∈-R

•  1
•  3
•  2
•  4

Solution
Plants are living objects is not a statement.