Doubtly
@Doubtly · Joined Feb 2021
- Answers
- 3,792
- Questions
- 4,033
- Upvotes received
- 424
- What is disproportionate ? in chemistry A disproportionation reaction is one in which a species has been both oxidised and reduced (that is, the oxidation state of the related spec... 1
- In △ABC , cos B= 3/5 , AB=5 and R=5 . find the area of △ABC correct answer is 6+8√3 2
- find the coefficient of x^256 in [1-x]^101 x (x^2+x+1)^100 Correct answer is ¹⁰⁰C₈₅ or ¹⁰⁰C₁₅ 1
- tangent and normal are drawn to y^2=2x at A(2,2). tangent cuts x-axix at T and normal cuts parabola again at P Ans is : 25/2 {area of ▵ ATP } 2
- Bird is flying in northeast direction with v 4rt^2 wind from north to south with 1m/s find the Ans: 15 m {displacement of bird} 2
- With increase of temperature, which of these changes? JEE Option C is correct molarity Temperature has no effect on mass but it has significant effect on volumes. Hence molality, mole fraction, mass... 1
- If both FeX2 & FeY3 are found to exist, X & Y can be : (1) X = F, Cl, Br, I Y = F, Cl, Br (2) X = Cl, Br, (1) X = F, Cl, Br, I :: Y = F, Cl, Br is the correct option Explaination:: FeI₃ does not exist as I^(–) reduces Fe³⁺ to Fe²⁺. 2Fe³⁺ + 2I – →... 1
- WAP in C++ that first initializes an array of given 10- sorted real numbers. The program must verify whether a given Output:: Below code is executed on gdb turbo c++ compiler , it takes 10 input of given number then sort by binary search technique #include<... 2
- write html code for following Faculty Arts Science Commerce Code :: <!DOCTYPE html> <table border="1" cellspacing="10px"> <tr> <th rowspan="2" colspan="2" > </th> <th colspan="3"> Faculty</th> </tr> <... 1
- If the equation a|z|^2 + bar (bar α z + α bar z) + d = 0 represents a circle Have a look in image for answer 2
- Let a complex number be w = 1 – √3i . Let another complex number z be such that |zw| = 1 and arg(z) – arg(w) Correct Answer is (2) 1/2 Explaination:: Image:: 1
- The statement among the following that is a tautology is : (1) A ∧ (A ∧ B) (2) A ∧(A ∧ B) (3) B → [A ∧(A → B)] (4) [A ∧ (A → B)] → B Correct Answer is (4) [A ∧ (A → B)] → B 2
- The negation of the statement ∼p∧(p∨q) is : A ) p∨∼q B) ∼p∨q C) ∼ p ∧ q D) p ∧ ∼ q Option (A) is correct A ) p∨∼q 2
- The statement A → (B → A) is equivalent to : (1) A → (A ∧ B) (2) A →(A → B) (3) A → Option 4) is correct (4) A → (A V B) 2
- The contrapositive of the statement "If you will work, you will earn money" is : (1) You will earn money, Correct answer is (3) If you will not earn money, you will not work Contrapositive of p → q is ~q → ~p p : you will work q : you will earn m... 1
- Let F1(A,B,C) = (A∧~B) ∨ [~C ∧ (A ∨ B)] ∨~A and F2(A, B) = (A ∨ B) ∨ (B →~A) be two logical expressions. Correct option is (3) (3) F₁ is not tautology but F₂ is a tautology F₁ : (A ∧~B) ∨[~C ∧ (A ∨ B)] ∨~A F₂ : (A ∨ B) ∨ (B →~A) F₁ : (A ∧~B) ∨~A... 1
- Which of the following Boolean expression is a tautology? (1) (p ∧ q) ∨ (p ∨ q) Correct Answer is 4) (p ∧ q) → (p → q) 1
- If the Boolean expression (p ⇒ q) ⇔ (q * ( ∼ q) is a tautology, then the boolean expression p * ( ∼ q) is equivalent to : Answer: (a) (p → q) ⇔ (q * ~ P) p q p → q q * ~ P ~ q ~ q ∧ p ~ (~ q ∧ p) T T T T F F T T F F F T T F F T T T F F T F F T T T F T ∴ ~ (~ q ∧... 1