Practice Questions

Q50. The compound ′A′ is a complementary base of .......... in DNA strands. JEE Main 2021 (27 Jul Shift 1) JEE Main Previous Year Paper (1) Uracil (2) Guanine (3) Adenine (4) Cytosine

Q50.Compound A gives D-Galactose and D-Glucose on hydrolysis. The compound A is : (1) Amylose (2) Sucrose (3) Maltose (4) Lactose Q51. 2 SO2( g) + O2( g) →2 SO3( g) JEE Main 2021 (27 Jul Shift 2) JEE Main Previous Year Paper The above reaction is carried out in a vessel starting with partial pressure PSO2 = 250 m bar, PO2 = 750 m bar and PSO3 = 0 bar . When the reaction is complete, the total pressure in the reaction vessel is _____ m bar . (Round off of the nearest integer).

Q50.Hydrolysis of sucrose gives: JEE Main 2021 (27 Aug Shift 2) JEE Main Previous Year Paper (1) α −D −(+)− Glucose and α −D −(−)- (2) α −D −(+)− Glucose and β −D −(−)− Fructose Fructose (3) α −D −(−)-Glucose and β −D −(−)- (4) α −D −(−) −Glucose and α −D −(+)- Fructose Fructose Q51. 100 g of propane is completely reacted with 1000 g of oxygen. The mole fraction of carbon dioxide in the resulting mixture is x × 10−2 . The value of x is (Nearest integer)

Q50.Which of the following is correct structure of tyrosine? JEE Main 2021 (17 Mar Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q50.Thiamine and pyridoxine are also known respectively as: (1) Vitamin B2 and Vitamin E (2) Vitamin E and Vitamin B2 (3) Vitamin B6 and Vitamin B2 (4) Vitamin B1 and Vitamin B6

Q50.Which of the following vitamin is helpful in the blood clotting? (1) Vitamin C (2) Vitamin E (3) Vitamin K (4) Vitamin B

Q50.Monomer units of Dacron polymer are : (1) glycerol and phthalic acid (2) ethylene glycol and phthalic acid (3) ethylene glycol and terephthalic acid (4) glycerol and terephthalic acid

Q50.Match List - I with List - II. List-I List-II (a) Valium (i) Antifertility drug (b) Morphine (ii) Pernicious anaemia (c) Norethindrone (iii) Analgesic (d) Vitamin B12 (iv) Tranquilizer JEE Main 2021 (24 Feb Shift 2) JEE Main Previous Year Paper (1) (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i) (2) (a)-(ii), (b)-(iv), (c)-(iii), (d)-(i) (3) (a)-(i), (b)-(iii), (c)-(iv), (d)-(ii) (4) (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)

Q50.Out of the following, which type of interaction is responsible for the stabilisation of 𝛼- helix structure of proteins? (1) Covalent bonding (2) Ionic bonding (3) Hydrogen bonding (4) vander Waals forces Q51.4 . 5 g of compound AM . W . = 90 was used to make 250 mL of its aqueous solution. The molarity of the solution in M is x × 10-1 . The value of x is_____ (Rounded off to the nearest integer)

Q50.Which of the following is NOT an example of fibrous protein ? (1) Keratin (2) Albumin (3) Myosin (4) Collagen

Q50.The polymer formed on heating Novolac with formaldehyde is: (1) Polyester (2) Bakelite (3) Nylon- 6, 6 (4) Melamine

Q51.The NaNO3 weighed out to make 50 mL of an aqueous solution containing 70. 0 mg Na+ per mL is_ g . (Rounded off to the nearest integer) [Given : Atomic weight in gmol−1 −Na : 23; N : 14; O : 16 ]

Q61.Let n denote the number of solutions of the equation z2 + 3z = 0, where z is a complex number. Then the value of ∑∞k=0 nk1 is equal to (1) 1 (2) 34 (3) 32 (4) 2

Q62.If α, β ∈R are such that 1 −2i (here i2 = −1) is a root of z2 + αz + β = 0, then (α −β) is equal to: (1) −7 (2) 7 (3) −3 (4) 3

Q63.The value of ∑6r=0(6Cr ⋅6C6−r) is equal to : (1) 1124 (2) 1324 (3) 1024 (4) 924

Q64.The negation of the statement ~p ∧(p ∨q) is: (1) ~p ∨q (2) ~p ∧q (3) p ∨~q (4) p ∧~q

Q64.If two tangents drawn from a point P to the parabola y2 = 16(x −3) are at right angles, then the locus of point P is: (1) x + 4 = 0 (2) x + 2 = 0 (3) x + 3 = 0 (4) x + 1 = 0 = b, then the ordered pair (a, b) is: lim −x + 1 −ax)

Q65.If nP r = nP r+1 and nCr = nCr−1, then the value of r is equal to: (1) 1 (2) 4 (3) 2 (4) 3

Q65.The length of the latus rectum of a parabola, whose vertex and focus are on the positive x-axis at a distance R and S(> R) respectively from the origin, is : (1) 2( S −R) (2) 2(S + R) (3) 4(S −R) (4) 4(S + R)

Q66.The Boolean expression (p ∧~q) ⇒(q ∨~p) is equivalent to: (1) q ⇒p (2) p ⇒q (3) ~q ⇒p (4) p ⇒~q

Q66.Consider the following three statements: (A) If 3 + 3 = 7 then 4 + 3 = 8 (B) If 5 + 3 = 8 then earth is flat. (C) If both (A) and (B) are true then 5 + 6 = 17. Then, which of the following statements is correct? (1) (A) is false, but (B) and (C) are true (2) (A) and (C) are true while (B) is false (3) (A) is true while (B) and (C) are false (4) (A) and (B) are false while (C) is true

Q67.The Boolean expression ( 𝑝⇒𝑞) ∧( 𝑞⇒~𝑝) is equivalent to : (1) ~𝑞 (2) 𝑞 (3) 𝑝 (4) ~𝑝

Q67.The statement among the following that is a tautology is: JEE Main 2021 (24 Feb Shift 1) JEE Main Previous Year Paper (1) 𝐴∨𝐴∧𝐵 (2) 𝐴∧𝐴∨𝐵 (3) 𝐵→𝐴∧𝐴→𝐵 (4) 𝐴∧𝐴→𝐵→𝐵

Q67.The contrapositive of the statement "If you will work, you will earn money" is: (1) If you will not earn money, you will not work (2) To earn money, you need to work (3) You will earn money, if you will not work (4) If you will earn money, you will work AAT = I2 , then the value of α4 + β4 is :

Q68.Let R = {(P, Q)|P and Q are at the same distance from the origin } be a relation, then the equivalence class of (1, −1) is the set JEE Main 2021 (26 Feb Shift 1) JEE Main Previous Year Paper (1) S = {(x, y) x2 + y2 = 1} (2) S = {(x, y) x2 + y2 = 2} (3) S = {(x, y) x2 + y2 = √2} (4) S = {(x, y) x2 + y2 = 4}