List of top Questions asked in NEET (UG)- 2008

Unisexuality of flowers prevents

Senescence as an active developmental cellular process in the growth and functioning of a flowering plant, is indicated in

Which one of the following is not observed in biodiversity hotspots ?

Endosperm is consumed by developing embryo in the seed of ....

Two radioactive materials $X_1$, and $X_2$ have decay constants 5$\lambda$ and $\lambda$ respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of X$_1$ to that X$_2$ will be 1/e after a time

A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of $3 \times 10^6 \, ms^{-1}. $ The velocity of the particle is (mass of electron=$9.1 \times 10^{-31} \, kg) $

Two simple harmonic motions of angular frequency 100 and 1000 rad $s^1$ have the same displacement amplitude. The ratio of their maximum acceleration is

Which one of the-following proved effective for biological control of nematodal diseases in plants ?

Which one of the following is the correct difference between rod cells and cone cells of our retina ?

A transgenic food crop which may help in solving the problem of night blindness in developing countries is

Bacterial leaf blight of rice is caused by a species

Darwin's finches are a good example of

Cry endotoxins obtained from Bacillus thuringiensis are effective against

Which one of the following items gives its correct total number?

How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g of HCl?

Base strength of (i) $h_3C \, {C} ^{\ominus} H_2$ (ii) $H_2 C= {C}^{\ominus} H$ (iii) $H-C \equiv C^{\ominus} $ is in the order of

A particle of mass m is projected with velocity v making an angle of $45^\circ$ with the horizontal. When the particle lands on the level ground the magnitude of the change in its momentum will be

A $p-n$ photodiode is made of a material with a band gap of $2\, eV$. The minimum frequency of the radiation that can be absorbed by the material is nearly (he = 1240 eV nm)

Two nuclei have their mass numbers in the ratio of 1 : 3. The ratio of their nuclear densities would be

On a new scale of temperature (which is linear) and called the W scale, the freezing and boiling points of water are 39$^{\circ}$W and 239$^{\circ}$W respectively. What will be the temperature on the new scale, corresponding to a temperature of 39$^{\circ}$C on the Celsius scale?

On the basis of the following $E^0 $ values, the strongest oxidising agent is $[Fe(CN)_6]^{4-} \rightarrow [Fe(CN)_6]^{3-}+e^-; $ $\hspace15mm E^0=-0.35 V $ $Fe^{2+} \rightarrow Fe^{3+} + e^-;E^0=-0.77 V $

A thin conducting ring of radius R is given a charge + The electric field at the center O of the ring due to the charge on the part AKB of the ring is E. The electric field at the center due to the charge on the part ACDB of the ring is

The rate constants $k_1$ and $k_2$ for two different reactions are $10^{16} .e^{-2000/T}$ and $10^{15} .e^{-1000/T}$,respectively. The temperature at which $k_1= k_2$ is

In which of the following coordination entities the magnitude of $\Delta_0$ (CFSE in octahedral field) will be maximum? (At. no. of Co = 27)

-The stability of carbanions in the following (i) $RC \equiv {C}^{\ominus}$ (iii) $R_2C = {CH}^{\ominus}$ (iv) $R_3C = {CH_2}^{\ominus}$ , is in the order of