NEET 2018 Question Paper with Solutions

If the mass of the Sun were ten times smaller and the universal gravitational constant were ten times larger in magnitude which of the following is not correct? Raindrops will fall faster. Walking on the ground would become more difficult. Time period of a simple pendulum on the Earth would decrease. g on the Earth will not change.

The volume (V) of a monatomic gas varies with its temperature (T) as shown in the graph. The ratio of work done by the gas to the heat absorbed by it when it undergoes a change from state A to state B is 2/5 2/3 1/3 2/7

A solid sphere is rotating freely about its symmetry axis in free space. The radius of the sphere is increased keeping its mass same. Which of the following physical quantities would remain constant for the sphere? Angular velocity Moment of inertia Rotational kinetic energy Angular momentum

The power radiated by a black body is P and it radiates maximum energy at wavelength \(\lambda_0\). If the temperature of the black body is now changed so that it radiates maximum energy at wavelength \(\frac{3}{4}\lambda_0\) the power radiated by it becomes nP. The value of n is 4/3 3/4 81/256 256/81

A pendulum is hung from the roof of a sufficiently high building and is moving freely to and fro like a simple harmonic oscillator. The acceleration of the bob of the pendulum is \(20\ \text{m s}^{-2}\) at a distance of 5 m from the mean position. The time period of oscillation is \(2\pi\ \text{s}\) \(\pi\ \text{s}\) 2 s 1 s

The correction factor 'a' to the ideal gas equation corresponds to density of the gas molecules volume of the gas molecules electric field present between the gas molecules forces of attraction between the gas molecules.

Which one is a wrong statement? Total orbital angular momentum of electron in s-orbital is equal to zero. An orbital is designated by three quantum numbers while an electron in an atom is designated by four quantum numbers The electronic configuration of N atom is The value of m for \(d_{z^2}\) is zero.

The correct order of atomic radii in group 13 elements is B < Al < In < Ga < Tl B < Al < Ga < In < Tl B < Ga < Al < Tl < In B < Ga < Al < In < Tl

The bond dissociation energies of \(X_2\) \(Y_2\) and XY are in the ratio of 1:0.5:1. \(\Delta H\) for the formation of XY is -200 kJ \(mol^{-1}\). The bond dissociation energy of \(X_2\) will be 800 kJ \(mol^{-1}\) 200 kJ \(mol^{-1}\) 400 kJ \(mol^{-1}\) 100 kJ \(mol^{-1}\)

Which of the following is correct with respect to -I effect of the substituents? (R = alkyl) \(-NH_2 -OR > -F\) \(-NR_2 > -OR > -F\)

A metallic rod of mass per unit length \(0.5\ \text{kg m}^{-1}\) is lying horizontally on a smooth inclined plane which makes an angle of \(30^\circ\) with the horizontal. The rod is not allowed to slide down by flowing a current through it when a magnetic field of induction 0.25 T is acting on it in the vertical direction. The current flowing in the rod to keep it stationary is 7.14 A 5.98 A 14.76 A 11.32 A

The electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A is Independent of the distance between the plates Linearly proportional to the distance between the plates Proportional to the square root of the distance between the plates Inversely proportional to the distance between the plates

The magnetic potential energy stored in a certain inductor is 25 mJ when the current in the inductor is 60 mA. This inductor is of inductance 0.138 H 138.88 H 1.389 H 13.89 H

An object is placed at a distance of 40 cm from a concave mirror of focal length 15 cm. If the object is displaced through a distance of 20 cm towards the mirror the displacement of the image will be 30 cm away from the mirror 36 cm away from the mirror 30 cm towards the mirror 36 cm towards the mirror

When the light of frequency \(2\nu_0\) (where \(\nu_0\) is threshold frequency) is incident on a metal plate the maximum velocity of electrons emitted is \(v_1\). When the frequency of the incident radiation is increased to \(5\nu_0\) the maximum velocity of electrons emitted from the same plate is \(v_2\). The ratio of \(v_1\) to \(v_2\) is 1:2 1:4 4:1 2:1

Nitration of aniline in strong acidic medium also gives m-nitroaniline because inspite of substituents nitro group always goes to only m-position in electrophilic substitution reactions amino group is meta directive in absence of substituents nitro group always goes to m-position in acidic (strong) medium aniline is present as anilinium ion.

When initial concentration of the reactant is doubled the half-life period of a zero order reaction is halved is doubled is tripled remains unchanged.

Considering Ellingham diagram which of the following metals can be used to reduce alumina? Fe Zn Mg Cu

The correct difference between first and second order reactions is that the rate of a first-order reaction does not depend on reactant concentrations; the rate of a second-order reaction does depend on reactant concentrations the half-life of a first-order reaction does not depend on \([A]_0\); the half-life of a second order reaction does depend on \([A]_0\) a first-order reaction can be catalysed; a second-order reaction cannot be catalysed the rate of a first-order reaction does depend on reactant concentrations; the rate of a second-order reaction does not depend on reactant concentrations

On which of the following properties does the coagulating power of an ion depend? The magnitude of the charge on the ion alone Size of the ion alone Both magnitude and sign of the charge on the ion The sign of charge on the ion alone