List of top Questions asked in NEET (UG)- 2007

Which of the following will give a pair of enantiomers? (en $= NH_2CH_2CH_2NH_2$)

If $60\%$ of a first order reaction was completed in $60\, min$, $50\%$ of the same reaction would be completed in approximately ($log\, 4 = 0.60 \,log\, 5 = 0.69$)

The reaction of hydrogen an iodine monochloride is given as $H _{2( g )}+2 ICl _{( g )} \rightarrow 2 HCl _{( g )}+ I _{2( g )}$ This reaction is of first order with respect to $H _{2( g )}$ and $ICl _{( g )}$, following mechanisms were proposed Mechanism $A$: $H _{2( g )}+2 ICl _{( g )} \rightarrow 2 HCl _{( g )}+ I _{2( g )}$ Mechanism $B$ : $H _{2( g )}+ ICl _{( g )} \rightarrow HCl _{( g )}+ HI _{( g )} ;$ Slow $HI _{( g )}+ ICl _{( g )} \rightarrow HCl _{( g )}+ I _{2( g )} ;$ Fast Which of the above mechanism $(s)$ can be consistent with the given information about the reaction:

If there is no rotation of plane polarised light by a compound in a specific solvent, though to be chiral, it may mean that

$A$ vertical spring with force constant $k$ is fixed on a table. $A$ ball of mass m at a height h above the free upper end of the spring falls vertically on the spring so that the spring is compressed by a distance $d$ . The net work done in the process is

Dimensions of resistance in an electrical circuit, in terms of dimension of mass $M$, of length $L$, of time $T$ and of current $I$, would be

An element, $X$ has the following isotopic composition; ${ }^{200} X : 90 \%$ ${ }^{199} X : 8.0 \%$ ${ }^{202} X : 2.0 \%$ The weighted average atomic mass of the naturally-occurring element $X$ is closest to:

With which of the following electronic configuration of an atom has the lowest ionisation enthalpy?

In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow and green seeded plants would you expect in $F_1$ generation ?

In the hexaploid wheat, the haploid $(n)$ and basic $(X)$ numbers of chromosomes are

Which part of ovary in mammals acts as an endocrine gland after ovulation?

Inheriatance of skin colour in human is an example of

Identify the correct order of the size of the following.

Which of the following oxidation states are the most characteristics for lead and tin respectively?

Two condensers, one of capacity \(C\) and the other capacity \(\frac{C}{2}\) are connected to a \(V\) -volt battery, as shown in the figure. 

The work done in charging fully both the condensers is

Two satellites of earth, $ S_1 $ and $ S_2 $ , are moving in the same orbit. The mass of $ S_1 $ is four times the mass of $ S_2 $ . Which one of the following statements is true ?

Select the wrong statement from the following :

What is common to whale, seal and shark ?

Industrial melanism as observed in peppered moth proves that:-

Which one of the following is a slime mould?

Which pair of the following belongs to basidiomycetes ?

Which one of the following statements about mycoplasma is wrong?

What is true about Nereis, scorpion, cockroach and silver fish?

What is common between parrot, platypus and kangaroo?

A small coin is resting on the bottom of a beaker filled with liquid. A ray of light from the coin travels upto the surface of the liquid and moves along its surface. How fast is the light travelling in the liquid?