List of top Questions asked in NEET (UG)

The measured value of length of a simple pendulum is $20 \,cm$ known with $2 \,mm$ accuracy. The time for $50$ oscillations was measured to be $40 \,s$ with Is resolution. Calculate, the percentage accuracy in the determination of acceleration due to gravity $g$ from the above measurements.
Identity Z in the sequence of reactions, $CH_3 CH_2 CH=CH_2 \xrightarrow{HBr/H_2 O_2}Y \xrightarrow{C_2H_5 ON_a}Z$
The angle of a prism is A. One of its refracting surfaces is silvered. Light rays falling at an angle of incidence 2A on the first surface returns back through the same path after suffering reflection at the silvered surface. The refractive index p, of the prism is
Tracheids differ from other tracheary elements in
In vitro clonal propagation in plants is characterized by
For a given exothermic reaction, $K_p$ and $K_p'$ are the equilibrium constants at temperatures $T_1$ and $T_2$, respectively. Assuming that heat of reaction is constant in temperature range between $T_1$ and $T_2$, it is readily observed that :-
In the Kjeldahl's method for estimation of nitrogen present in a soil sample, ammonia evolved from $0.75\, g$ of sample neutralized $10\, mL$ of ${1 \, M \, H_2SO_4}$. The percentage of nitrogen in the soil is :
$Be^{2+}$ is isoelectronic with which of the following ions?
A certain number of spherical drops of a liquid of radius $r$ coalesce to form a single drop of radius $R$ and volume $V$. If $T$ is the surface tension of the liquid, then
Certain quantity of water cools from 70$^{\circ}$C to 60$^{\circ}$C in the first 5 minutes and to 54$^{\circ}$C in the next 5 minutes. The temperature of the surroundings is
The pair of compounds that can exist together is
The main function of mammalian corpus luteum is to produce
Anoxygenic photosynthesis is characteristic of
The barrier potential of a $p-n$ junction depends on (1) type of semiconductor material (2) amount of doping (3) temperature Which one of the following is correct?
Which of the following hormones is produced under the condition of stress which stimulates glycogenolysis in the liver of human beings?
The hormone releasing IUD is
Geitonogamy involves
The ratio of the accelerations for a solid sphere (mass m and radius R) rolling down an incline of angle $ \theta $ without slipping and slipping down the incline without rolling is
The reaction of aqueous $KMnO_4$ with $ H_2O_2 $ in acidic conditions gives
Reason of lanthanoid contraction is
A human female with Turner's syndrome
Among the following complexes, the one which shows zero crystal field stabilisation energy (CFSE) is
In which one of the following processes CO2 is not released?
To obtain virus - free healthy plants from a diseased one by tissue culture technique, which part/parts of the diseased plant will be taken?
The motile bacteria are able to move by