List of top Questions asked in NEET (UG)- 1991

A car moves a distance of 200 m. It covers the first half of the distance at speed 40 km/h and the second half of distance at speed v. The average speed is 48 km/h. The value of v is
A colour blind girl is rare because she will be born only when
Which one occurs in echinodermata?
An insect regarded as greatest mechanical carrier of diseases is
Metamorphosis of insects is regulated through hormone
Classification of Porifera is based on
The excretory structures of flatworms/ Taenia are
Bladderworm/cysticercus is the larval stage of
Commercial cork is obtained from
Botanical name of cauliflower is
K(5) C(5) A(5) G(2) is floral formula of
Epipetalous and syngenesious stamens occur in
A magnetic field of $2\times 10^{-2}$T acts at right angles to a coil of area 100 $cm^2$, with 50 turns. The average e.m.f. induced in the coil is 0.1 V, when it is removed from the field in t sec. The value of t is
Photosynthetic pigments found in the chloroplasts occur in
The maximum number of electrons, present in an orbit that is represented by azimuthal quantum number $(l)=3$, will be
Basicity of orthophosphoric acid is
In compound ' X - all the bond angles are exactly 109$^{\circ}$28', 'X - is
$PCl_3$ reacts with water to form
Freshly released human egg has
A 100 millihenry coil carries a current of 1 A. Energy stored in its magnetic field is
A uniform magnetic field acts right angles to the direction of motion of electrons. As a result, the electron moves in a circular path of radius 2 cm. If the speed of electrons is doubled, then the radius of the circular path will be
A deuteron of kinetic energy 50 keV is describing a circular orbit of radius 0.5 metre in a plane perpendicular to magnetic field B. The kinetic energy of the proton that describes a circular orbit of radius 0.5 metre in the same plane with the same B is
A particle of mass m = 5 is moving with a uniform speed v = 3$\sqrt 2$ in the XOY plane along the line Y = X + 4. The magnitude of the angular momentum of the particle about the origin is
At a particular locus, frequency of allele $A$ is $0.6$ and that of allele a is $0.4$. What would be the frequency of heterozygotes in a random mating population at equilibrium?
Hormone connected with cell division, is