NEET 2012 Question Paper with Solutions

The dimensions of \((\mu_0\epsilon_0)^{-1/2}\) are \([L^{1/2}T^{-1/2}]\) \([L^{-1}T]\) \([LT^{-1}]\) \([L^{1/2}T^{1/2}]\)

A car of mass m starts from rest and accelerates so that the instantaneous power delivered to the car has a constant magnitude \(P_0\). The instantaneous velocity of this car is proportional to \(t^2P_0\) \(t^{1/2}\) \(t^{-1/2}\) \(t/\sqrt{m}\)

Three masses are placed on the x-axis: 300 g at origin 500 g at x = 40 cm and 400 g at x = 70 cm. The distance of the centre of mass from the origin is: 40 cm 45 cm 50 cm 30 cm

If \(v_e\) is escape velocity and \(v_o\) is orbital velocity of a satellite for orbit close to the earth's surface then these are related by \(v_o = \sqrt{2v_e}\) \(v_o = v_e\) \(v_e = \sqrt{2v_o}\) \(v_e = 2v_o\)

A stone is dropped from a height h. It hits the ground with a certain momentum P. If the same stone is dropped from a height 100% more than the previous height the momentum when it hits the ground will change by 68% 41% 200% 100%

Which of the following reagents will be able to distinguish between 1-butyne and 2-butyne? \(NaNH_2\) HCl \(O_2\) \(Br_2\)

A certain gas takes three times as long to effuse out as helium. Its molecular mass will be 27 u 36 u 64 u 9 u

During change of \(O_2\) to \(O_2^-\) ion the electron adds on which one of the following orbitals? \(\pi^*\) orbital \(\pi\) orbital \(\sigma^*\) orbital \(\sigma\) orbital

Four diatomic species are listed below. Identify the correct order in which the bond order is increasing in them \(NO < O_2^- < C_2^{2-} < He_2^+\) \(O_2^- < NO < C_2^{2-} < He_2^+\) \(C_2^{2-} < He_2^+ < O_2^- < NO\) \(He_2^+ < O_2^- < NO < C_2^{2-}\)

Given that the equilibrium constant for the reaction \(2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g)\) has a value of 278 at a particular temperature. What is the value of the equilibrium constant for the following reaction at the same temperature? \(SO_3(g) \rightleftharpoons SO_2(g) + \frac{1}{2}O_2(g)\) \(1.8 \times 10^{-3}\) \(3.6 \times 10^{-3}\) \(6.0 \times 10^{-2}\) \(1.3 \times 10^{-5}\)

The transition from the state n = 3 to n = 1 in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from \(2 \rightarrow 1\) \(3 \rightarrow 2\) \(4 \rightarrow 2\) \(4 \rightarrow 3\)

A magnetic needle suspended parallel to a magnetic field requires \(\sqrt{3}\ \text{J}\) of work to turn it through \(60^\circ\). The torque needed to maintain the needle in this position will be \(2\sqrt{3}\ \text{J}\) 3 J \(\sqrt{3}\ \text{J}\) \(2\sqrt{3}\ \text{J}\)

A proton carrying 1 MeV kinetic energy is moving in a circular path of radius R in uniform magnetic field. What should be the energy of an \(\alpha\)-particle to describe a circle of same radius in the same field? 2 MeV 1 MeV 0.5 MeV 4 MeV

To get an output Y = 1 in given circuit which of the following input will be correct? A = 1 B = 0 C = 0 A = 1 B = 0 C = 1 A = 1 B = 1 C = 0 A = 0 B = 1 C = 0

A parallel plate capacitor has a uniform electric field E in the space between the plates. If the distance between the plates is d and area of each plate is A the energy stored in the capacitor is \(\frac{1}{2}\epsilon_0 E^2\) \(\frac{\epsilon_0 E^2 Ad}{2}\) \(\frac{1}{2}\epsilon_0 E^2 Ad\) \(\epsilon_0 EAd\)

Consider the reaction: \(RCHO + NH_2NH_2 \rightarrow RCH=N-NH_2\) What sort of reaction is it? Electrophilic addition-elimination reaction Free radical addition-elimination reaction Electrophilic substitution-elimination reaction Nucleophilic addition-elimination reaction

Which one of the following does not correctly represent the correct order of the property indicated against it? Ti < V < Cr < Mn; increasing number of oxidation states \(Ti^{3+} < V^{3+} < Cr^{3+} < Mn^{3+}\): increasing magnetic moment Ti < V < Cr < Mn: increasing melting points Ti < V < Mn < Cr: increasing 2nd ionization enthalpy

Standard reduction potentials of the half reactions are given below: \(F_2(g) + 2e^- \rightarrow 2F^-(aq); E^\circ = +2.85\ \text{V}\) \(Cl_2(g) + 2e^- \rightarrow 2Cl^-(aq); E^\circ = +1.36\ \text{V}\) \(Br_2(l) + 2e^- \rightarrow 2Br^-(aq); E^\circ = +1.06\ \text{V}\) \(I_2(s) + 2e^- \rightarrow 2I^-(aq); E^\circ = +0.53\ \text{V}\) The strongest oxidising and reducing agents respectively are \(F_2\) and \(I^-\) \(Br_2\) and \(Cl^-\) \(Cl_2\) and \(Br^-\) \(Cl_2\) and \(I_2\)

Molar conductivities (\(\Lambda_m^\circ\)) at infinite dilution of NaCl HCl and \(CH_3COONa\) are 126.4 425.9 and \(91.0\ \text{S cm}^2\ mol^{-1}\) respectively. (\(\Lambda_m^\circ\)) for \(CH_3COOH\) will be \(425.5\ \text{S cm}^2\ mol^{-1}\) \(180.5\ \text{S cm}^2\ mol^{-1}\) \(290.8\ \text{S cm}^2\ mol^{-1}\) \(390.5\ \text{S cm}^2\ mol^{-1}\)

Which of the following compounds can be used as antifreeze in automobile radiators? Methyl alcohol Glycol Nitrophenol Ethyl alcohol