List of top Questions asked in NEET (UG)- 2012

In the circuit shown the cells A and B have negligible resistances. For $V_A =12\, V,\, R_1 =500\, \Omega $ and $ R =100\, \Omega $ the galvanometer (G) shows no deflection. The value of $V_B$ is

If the radius of a star is $R$ and it acts as a black body, what would be the temperature of the star, in which the rate of energy production is $ Q ? $ ($ \sigma $ stands for Stefan's constant)

A solid cylinder of mass $3\, kg$ is rolling on a horizontal surface with velocity $4\, ms^{-1}$. It collides with a horizontal spring of force constant $200\, N\, m^{-1}$. The maximum compression produced in the spring will be

When $Cl_2$ gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from

Two spheres $A$ and $B$ of masses $m_1$ and $m_2$ respectively collide. $A$ is at rest initially and $B$ is moving with velocity $v/2$ along x-axis. After collision $B$ has a velocity in a direction perpendicular to the original direction. The mass $A$ moves after collision in the direction

Which one of the following options gives one correct example each of convergent evolution and divergent evolution?

	Convergent evolution	Divergent evolution
(a)	Eyes of octopus and mammals	Bones of forelimbs of vertebrates
(b)	Thorns of Bougainvillea and tendrils of Cucurbita	Wings of butterfly and birds
(c)	Bones of forelimbs of vertebrates	Wings of butterfly and birds
(d)	Thorns of Bougainvillea and tendrils of Cucurbita	Eyes of octopus and mammals

Which one of the following options gives the correct categorisation of animals according to the type of nitrogenous waste they give out?

	Ammonotelic	Ureotelic	Uricotelic
(a)	Pigeon, humans	Aquatic amphibia, lizards	Cockroach frog
(b)	Frog, lizards	Aquatic amphibia humans	Cockroach pigeon
(c)	Aquatic animals	Frog, amphibia, humans	Pigeon, lizards, cockroach
(d)	Aquatic animals	Cockroach, amphibia, humans	Frog, pigeon, lizards

The supportive skeletal structures in the human external ears and in the nose tip are examples of

A geostationary satellite is orbiting the earth at a height of $5\,R$ above that surface of the earth, $R$ being the radius of the earth. The time period of another satellite in hours at a height of $2\,R$ from the surface of the earth is

A spherical planet has a mass $M_p$ and diameter $D_p$. A particle of mass $m$ falling freely near the surface of this planet will experience an acceleration due to gravity, equal to

An electron of a stationary hydrogen atom passes from the fifth energy level to the ground level. The velocity that the atom acquired as a result of photon emission will be ($m$ is the mass of the electron, $R$, Rydberg constant and $h$ Planck's constant)

In which one of the following the genus name its two characters and its phylum are not correctly matched, whereas the remaining three are correct

	Genus name	Characters	Phylum
(a)	Pila	(i) Body segmented (ii) Mouth with radula	Mollusca
(b)	Asterias	(i) Spiny skinned (ii) Water vascularsystem	Echinodermata
(c)	Sycon	(i) Pore bearing (ii) Canal system	Porifera
(d)	Periplaneta	(i) Jointed appendages (ii) Chitinous exoskeleton	Arthropoda