List of top Questions asked in AIIMS

What should be the maximum acceptance angle at the air-core interface of an optical fibre if $n_1 $ and $n_2$ are the refractive indices of the core and the cladding, respectively?
Among the following pairs of ions, the lower oxidation state in aqueous solution is more stable than the other, in
An aqueous solution of $CoCl_2$ on addition of excess of concentrated $HCl$ turns blue due to formation of
In which of the following pairs both the complexes show optical isomerism?
Among the following molecules (i)$\overset{\bullet \bullet}{Xe}O_{3}$ (ii)$\overset{\bullet \bullet}{Xe}OF_4$ (iii)$\overset{\bullet \bullet}{Xe}F_6$ those having same number of lone pairs on $Xe$ are
In diborane, the two $H-B-H$ angles are nearly :
: $SeCl_4$ does not have a tetrahedral structure. :$Se$ in $SeCl_4$ has two lone pairs.
Which one of the following statements is true for protein synthesis (translation)?
$CH_3CO_2C_2H_5$ on reaction with sodium ethoxide in ethanol gives $A$, which on heating in the presence of acid gives $B$. Compound $B$ is
Compressibility factor for hydrogen varies with pressure with positive slope at all pressure. Even at low pressure, repulsive forces dominate for hydrogen gas.
$3$-Phenylpropene on reaction with $HBr$ gives (as a major product)
The nucleic acid base having two possible binding sites is
In an orbital motion, the angular momentum vector is
Two parallel beams of positrons moving in the same direction will
Carbon dating is best suited for determining the age of fossils if their age in years is of the order of
Given below is a representation of a kind of chromosomal mutation. What is the kind of mutation represented?
A larger dry cell has higher emf. The emf of a dry cell is proportional to its size.
Two springs are connected to a block of mass $M$ placed on a frictionless surface as shown below. If both the springs have a spring constant $k$, the frequency of oscillation of the block is
In Ulothrix meiosis takes place in
The electric field due to a uniformly charged sphere of radius $R$ as a function of the distance from its centre is represented graphically by
In the basic $CsCL$ crystal structure, $Cs^+$ and $Cl^-$ ions are arranged in a bcc configuration as shown in the figure. The net electrostatic force exerted by the eight $Cs^{+}$ ions on the $Cl^-$ ions is
Equipotential surfaces associated with an electric field which is increasing in magnitude along the $x-$ direction are
A $40\, \mu F$ capacitor in a defibrillator is charged to $3000 \,V$. The energy stored in the capacitor is sent through the patient during a pulse of duration $2\, ms$. The power delivered to the patient is
The true geographic north direction is found by using a compass needle. The magnetic meridian of the earth is along the axis of rotation of the earth.
Dimethyl glyoxime gives a red precipitate with $Ni ^{2+}$, which is used for its detection. To get this precipitate readily the best $pH$ range is