List of top Questions asked in NEET (UG)- 2003

Two 220-volt, 100-watt bulbs are connected first in series and then in parallel. Each time the combination is connected to a 220-volt a.c. supply line. The power drawn by the combination in each case respectively will be:

In a Wheatstone's bridge all the four arms have equal resistance R. If the resistance of the galvanometer arm is also R,the equivalent resistance of the combination as seen by the battery is:

Three capacitors each of capacity 4µF are to be connected in such a way that the effective capacitance of 6µF. This can be done by

A nuclear reaction is given by,
_ZX^A → _Z+1Y^A +_–1e⁰+$\bar v$ represents

The radioisotope, tritium 13(H) has a half-life of 12.3 years. If the initial amount of tritium is 32 mg, how many milligrams of it would remain after 49.2 years:

Which one of the following is a free-radical substitution reaction:

The final product C, obtained in this reaction, would be:

When m-chlorobenzaldehyde is treated with 50% KOH solution, the product(s) obtained is (are)

Escherichia coli is used as an indicator organism to determine pollution of water with:

Following diagram performs the logic function of:

In a set of the given reactions, acetic acid yielded a product C.
CH₃COOH+PCl₅$\rightarrow$ A $\xrightarrow[Anh.\,AlCl_3]{C_6H_6}$ B $\xrightarrow[ether]{C2H5MgBr}$ ‘C’, product C would be

Acrolein is a hard,horny and a high melting point material. Which of the following represent its structure:

A and B in the following reactions are :

Which one of the following monomers gives the polymer neoprene on polymerization :

A sample of radioactive element has a mass of $10\, g$ at an instant $t = 0.$ The approximate mass of this element in the sample after two mean lives is

Consider a compound slab consisting of two different materials having equal thicknesses and thermal conductivities $K$ and $2\, K,$ respectively. The equivalent thermal conductivity of the slab is

A charged particle moves through a magnetic field in a direction perpendicular to it. Then the

Two spheres of masses m and M are situated in the air and the gravitational force between them is F. The space around the masses in now filled with a liquid of specific density 3. The gravitational force will now be:

A bar magnet is oscillating in the Earth's magnetic field with a period T. What happens to this period and motion if this mass is quadrupled:

A particle of mass m oscillates with simple harmonic motion between points x₁ and x₂, the equilibrium position being O. Its potential energy is plotted. It will be as given below in the graph:

The potential energy of a simple harmonic oscillator when the particle is half way to its end point is:

A charge q is located at the centre of a cube. The electric flux through any face is:

The compound on reaction with NaIO₄ in the presence of KMnO₄ given:

Chromosomes in a bacterial cell can be 1–3 in number and:

Two crosses between the same pair of genotypes or phenotypes in which the sources of the gametes are reversed in one cross, is known as: