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

Escherichia coli is used as an indicator organism to determine pollution of water with:
Following diagram performs the logic function of:
logic function
Which of the following pairs of compounds are enantiomers:
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 : 
HCN/KCN
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
A man throws balls with the same speed vertically upwards one after the other at an interval of $2s$. What should be the speed of the throw so that more than two balls are in the sly at any time? (Given $g = 9.8\, m/s^2$)
Christmas disease is another name for
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
In which one of the following do the two names refer to one and the same thing ?
Viruses are no more 'alive' than isolated chromosomes because
Bartholin's are situated
Cellular totipotency is demonstrated by
The cells of the quiescent centre are characterised by
Sycon belongs to a group of animals, which are best described as
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:

Maximum application of animal cell culture technology today is in the production of