NEET 2023 question paper

Let a wire be suspended from the ceiling (rigid support) and stretched by a weight W attached at its free end. The longitudinal stress at any point of cross-sectional area A of the wire is:

The half life of a radioactive substance is 20 minutes. In how much time, the activity of substance drops to (1/16)th of its initial value?

An electric dipole consists of charges −q and +q separated by 6 cm (each 3 cm from the centre O). Point P lies on the axis of the dipole, on the side of +q, at 5 cm from O. The electric potential (in 10² V) at point P due to the dipole is (ε₀ = permittivity of free space and 1/(4πε₀) = K):

Identify the product in the following reaction: Benzenediazonium chloride (C₆H₅N₂⁺Cl⁻) —[(i) Cu₂Br₂/HBr; (ii) Mg/dry ether; (iii) H₂O]→ Product

Identify product (A) in the following reaction: 1-[3-(3-Acetylcyclohexyl)phenyl]ethan-1-one (a cyclohexane ring and a benzene ring joined together, each carrying a –COCH₃ group at the meta/3-position) —(Zn–Hg, conc. HCl)→ (A) + 2H₂O

Which amongst the following will be most readily dehydrated under acidic conditions?

Cellulose does not form blue colour with Iodine because:

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion A: ATP is used at two steps in glycolysis. Reason R: First ATP is used in converting glucose into glucose-6-phosphate and second ATP is used in conversion of fructose-6-phosphate into fructose-1,6-diphosphate. In the light of the above statements, choose the correct answer from the options given below:

Which one of the following common sexually transmitted diseases is completely curable when detected early and treated properly?

Match List-I with List-II. List-I: A. P-wave B. Q-wave C. QRS complex D. T-wave List-II: I. Beginning of systole II. Repolarisation of ventricles III. Depolarisation of atria IV. Depolarisation of ventricles Choose the correct answer from the options given below: