Doubtly
@Doubtly · Joined Feb 2021
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- If the binary operation * is defind on the set Q+ of all positive rational numbers by a * b (a) 3/160 1
- If f : R → R, g : R → R and h : R → R are such that f(x) = x2, g(x) = tan x and h(x) = log x, Answer is a)0 2
- If f(x) = \(1-\frac{1}{x}\), then f(f(\(\frac{1}{x}\))) (a) \(\frac{1}{x}\) (b) \(\frac{1}{1+x}\) Answer is (c) x/x-1 1
- Let \(f(x)=\frac{x-1}{x+1}\), then f(f(x)) is (a) \(\frac{1}{x}\) (b) \(-\frac{1}{x}\) Answer is (b) -1/x 1
- Let f : N → R : f(x) = \(\frac{(2 x-1)}{2}\) and g : Q → R : g(x) = x + 2 be two functions. Answer is (a) 3 2
- If f : R → R and g : R → R defined by f(x) = 2x + 3 and g(x) = x2 + 7, then the value of x for which Answer is (b) ±2 2
- If f : R → R, g : R → R and h : R → R is such that f(x) = x2, g(x) = tanx and h(x) = logx Answer is a) 0 2
- If f(x) = (ax2 + b)3, then the function g such that f(g(x)) = g(f(x)) is given by Correct option is d) g(x)=(fracx^(1 / 3)-ba)^(1 / 2) 1
- The number of bijective functions from set A to itself when A contains 106 elements is Correct option is c) 106! 2
- The function f : R → R defined by f(x) = 3 – 4x is (a) Onto (b) Not onto (c) None one-one (d) None of these Correct option is a) onto 2
- The smallest integer function f(x) = [x] is (a) One-one (b) Many-one (c) Both (a) & (b) (d) None of these Correct option is (b) Many-one 2
- The function f : A → B defined by f(x) = 4x + 7, x ∈ R is (a) one-one (b) Many-one (c) Odd (d) Even correct option is (a) one-one 2
- Digital signals (i) do not provide a continuous set of values, (ii) represent values as discrete steps, (Hi) (c) is correct because the decimal system is concerned with continuous values (i) to (iii). 1
- Frequencies in the UHF range normally propagate by means of (a) ground waves (b) sky waves correct option is (d) space waves. 2
- At which of the following frequency/frequencies the communication will not be reliable for a receiver situated (b) is correct. Here (c) and (d) frequencies have high penetration power so the earth will absorb them. Radiation (a) of 10 kHz will suffer... 1
- Which of the following salts is the most basic in aqueous solution ? (1) FeCl3 (2) Pb(CH3COO)2 (3) Al(CN)3 (4) CH3COOK (4) CH3COOK is most basic among the given options 2
- Mathematical Reasoning JEE MAIN 2021 PYQ Mathematical Reasoning JEE MAIN 2021 PYQ Summary of the post :: According to our study jee main 2021 feb and march mostly Previous year ques... 1
- Complex number JEE Main 2021 questions PYQ Complex number JEE Main 2021 questions PYQ Q1)Let a complex number be w = 1 – √3i . Let another complex number z be such that |zw| = 1 and a... 1