Practice Questions

Q48.Which of the following polymer is used in the manufacture of wood laminates ? (1) cis-poly isoprene (2) Melamine formaldehyde resin (3) Urea formaldehyde resin (4) Phenol and formaldehyde resin

Q49.Match the list −I with list −II List −I List −II (Class of Drug) (Example) (a) Antacid (i) Novestrol (b) Artificial sweetener (ii) Cimetidine (c) Antifertility (iii) Valium (d) Tranquilizers (iv) Alitame (1) a −ii, b −iv, c −i, d −iii (2) a −iv, b −i, c −ii, d −iii (3) a −iv, b −iii, c −i, d −ii (4) a −ii, b −iv, c −iii, d −i

Q49.Bakelite is a cross-linked polymer of formaldehyde and: (1) PHBV (2) Buna-S (3) Novolac (4) Dacron

Q49.Carbylamine test is used to detect the presence of primary amino group in an organic compound. Which of the following compound is formed when this test is performed with aniline? (1) (2) (3) (4)

Q49.The structure of Neoprene is : (1) (2) (3) (4)

Q49. A B C D The correct statement about (A), (B), (C) and (D) is: JEE Main 2021 (27 Aug Shift 1) JEE Main Previous Year Paper (1) (B) and (C) are tranquillizers (2) (B), (C) and (D) are tranquillizers (3) (A) and (D) are tranquillizers (4) (A), (B) and (C) are narcotic analgesics

Q49.The functions of antihistamine are : (1) Antiallergic and Analgesic (2) Antacid and Antiallergic (3) Analgesic and antacid (4) Antiallergic and antidepressant

Q49.Which among the following is not a polyester ? (1) Glyptal (2) PHBV (3) Novolac (4) Dacron

Q49.In polymer Buna- S :′S′ stands for: (1) Strength (2) Sulphur (3) Sulphonation (4) Styrene

Q49.Match List-I with List-II : List - I List - II (a) Chloroprene (i) (b) Neoprene (ii) (c) Acrylonitrile (iii) (d) Isoprene (iv) Choose the correct answer from the options given below: (1) (a) - (iii), (b)-(iv), (c) -(ii), (d) -(i) (2) (a) - (ii), (b)-(iii), (c)-(iv), (d) -(i) (3) (a) - (ii), (b)-(i), (c) -(iv), (d) -(iii) (4) (a) - (iii), (b)-(i), (c) -(iv), (d) -(ii)

Q49.Fructose is an example of :- (1) Pyranose (2) Ketohexose (3) Aldohexose (4) Heptose

Q50.Deficiency of vitamin K causes : (1) Increase in blood clotting time (2) Increase in fragility of RBC 's (3) Cheilosis (4) Decrease in blood clotting time

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

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.Which among the following pairs of Vitamins is stored in our body relatively for longer duration? (1) Thiamine and Vitamin A (2) Vitamin A and D (3) Thiamine and Ascorbic acid (4) Ascorbic acid and Vitamin D

Q50.The secondary structure of protein is stabilised by: (1) Peptide bond (2) glycosidic bond (3) Hydrogen bonding (4) van der Waals forces

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.A non-reducing sugar A hydrolyses to give two reducing mono saccharides. Sugar A is (1) Fructose (2) Galactose (3) Glucose (4) Sucrose Q51.______grams of 3−Hydroxy propanal (MW = 74) must be dehydrated to produce 7. 8 g of acrolein (MW = 56)(C3H4O) if the percentage yield is 64. (Round off to the Nearest Integer). [Given: Atomic masses : C : 12. 0u, H : 1. 0u, O : 16. 0u]

Q50.Which one of the following statements is not true about enzymes? (1) Enzymes are non-specific for a reaction and substrate. (2) Almost all enzymes are proteins. (3) Enzymes work as catalysts by lowering the activation energy of a biochemical reaction. (4) The action of enzymes is temperature and pH specific JEE Main 2021 (20 Jul Shift 2) JEE Main Previous Year Paper

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.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.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.The water soluble protein is: (1) Fibrin (2) Albumin (3) Myosin (4) Collagen

Q50.Which one of the following is correct structure for cytosine ? JEE Main 2021 (25 Jul Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

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