List of top Questions asked in NEET (UG)

Two planets \(P_1\) and \(P_2\) with equal mass have radii \(R_1\) and \(R_2\), respectively, where \[ R_2=\frac{R_1}{2} \] The escape speeds of \(P_1\) and \(P_2\) are \(v_1\) and \(v_2\), respectively. Then the value of \[ \frac{v_2}{v_1} \] is:

The compound that CANNOT be obtained from the aldol condensation reaction shown below, is

Mitochondrial inner membrane encloses____________.

A thin horizontal disc is rotating about a vertical axis passing through its fixed centre \(O\). Its angular momentum is \(L_A\) and \(L_B\) computed about points \(A\) and \(B\), respectively, where \(OB=2\times OA\). The value of \[ \frac{L_A}{L_B} \] is:

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: In recombinant DNA technology, lysozyme is used for disrupting bacterial cells while cellulase is used for plant cells.
Reason R: Isolation of genetic material needs disruption of cells.
In the light of the above statements, choose the most appropriate answer from the options given below:

A cylindrical cork of uniform density \(\rho_1\) floats in a liquid of density \(\rho_1\). If the cork is depressed slightly and released, it oscillates harmonically with time period \(T\). If the same cork floats in another liquid of density \(\rho_2\), then the similar oscillation has time period \(2T\). The value of \(\dfrac{\rho_2}{\rho_1}\) is:

An AC voltage \[ V=220\sin(2\times10^{3}t)\ \text{Volt} \] is applied to a series LCR circuit. Then the current amplitude in the circuit is: Given: \[ L=10\,\text{mH},\quad C=25\,\mu\text{F},\quad R=100\,\Omega \]

If the diploid chromosome number of typical angiosperm is 36, what would be the chromosome number in its endosperm ?

For a salt XY, which is a strong electrolyte, the plot of \(\Lambda_m\) versus \(\sqrt{c}\) has a slope of \(-90.0\text{ S cm}^2\text{ mol}^{-3/2}\text{ L}^{1/2}\) at \(298\text{ K}\). At \(0.01\text{ M}\) concentration of XY, the value of \(\Lambda_m\) is \(145.0\text{ S cm}^2\text{ mol}^{-1}\). The limiting molar conductivity of \(\text{Y}^-\) ion (\(\lambda^\circ_{\text{Y}^-}\), in \(\text{S cm}^2\text{ mol}^{-1}\)) at \(298\text{ K}\) will be (Given: \(\lambda^\circ_{\text{X}^+} = 74.0\text{ S cm}^2\text{ mol}^{-1}\))

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: In an experiment, Mendel observed that the \(F_1\) progeny plants are all tall and none are dwarf.
Reason R: Stem height is a contrasting trait, with tall being dominant and dwarf being recessive.
In the light of the above statements, choose the most appropriate answer from the options given below:

Water flows in a streamline motion through a horizontal pipe of circular cross-section as shown in the figure. The pressure difference of water between \(P\) and \(Q\) is \(15\,\text{N m}^{-2}\). The area of cross-section at \(P\) and \(Q\) are \(40\,\text{cm}^2\) and \(20\,\text{cm}^2\), respectively. The rate of flow of water through the pipe, in \(\text{cm}^3\text{s}^{-1}\), is:

Which of the following plant growth regulators promotes internode elongation prior to flowering in cabbage ?

A solid sphere \(A\) of radius \(R\) and mass \(M\) is attached to a smaller solid sphere \(B\) of radius \(r\) (\(r\lt R\)) and mass \(m\) (\(m\lt M\)). The centres lie on the same horizontal line. The moments of inertia about the vertical axes passing through the centres of \(A\) and \(B\) are \(I_A\) and \(I_B\), respectively. The value of \(I_A-I_B\) is:

Arrange the following in descending order of number of species in the Amazonian rain forest.
(a) Plants
(b) Birds
(c) Fishes
(d) Invertebrates
(e) Mammals
Choose the correct answer from the options given below:

Identify the reactions which give aniline as the major product.

Among the species given below, the spin-only magnetic moment is highest for
(Given: Atomic number of Ti = 22, Mn = 25, Fe = 26 and Co = 27)

Mad cow disease is caused by ____________.

Which of the following are secondary lymphoid organs?
(a) Bone marrow
(b) Tonsils
(c) Spleen
(d) Thymus
Choose the correct answer from the options given below :

Colostrum, secreted by mother during initial days of lactation, is abundant in

Which of the following statements is incorrect?

The pigment responsible for the red colour of ripe tomato is

Which of the following statements are correct?
(a) Energy flow from producers to consumers is unidirectional
(b) Energy pyramid can never be inverted
(c) Transfer of energy follows the 1% law
Choose the correct answer from the options given below :

A current \(I_0\) flows through a metallic circular loop of radius \(r\) as shown. The resistance of arc \(ABC\) is half that of arc \(ADC\). Find the magnetic field at the centre \(O\).

The following table presents the part of the electromagnetic spectrum and their corresponding major applications. Match the following and choose the correct option. \[ \begin{array}{|c|c|c|c|} \hline \text{Part of Spectrum} & & \text{Applications} & \\ \hline P & \text{Microwave} & I & \text{For purifying water} \\ \hline Q & \text{UV rays} & II & \text{For warming food} \\ \hline R & \text{Gamma rays} & III & \text{For AM and FM communication systems} \\ \hline S & \text{Radio waves} & IV & \text{Cancer cells treatment} \\ \hline \end{array} \]