List of top Questions asked in AIIMS

Optical fibres are used for telecommunication Optical fibres are based on the phenomenon of total internal reflection.
NAND is a universal gate. It can be used to describe all other logic gates.
n: Light emitting diode $(LED)$ emits spontaneous radiation. : $LED$ are forward biased p-n junctions.
: $F-F$ bond in $F _{2}$ molecule is strong. : $F$ atom is small in size.
F is more electronegative than Cl F has high electron affinity than Cl.
: Chlorine has higher electron affinity than fluorine. : Chlorine is a poor oxidising than fluorine.
Benzene diazonium salt on boiling with water forms phenol. C $-$ N bond is polar.
: At high pressure, the compression factor $Z$ is $\left(1+\frac{P b}{R T}\right)$. : At high pressure van der Waals' equation is modified as $P(V-b)=R T$.
An astronaut experience weightlessness in a space satellite. When a body falls freely it does not experience gravity.
Aldosterone is a steroid hormone and is important in the control of sodium and potassium ion concentration in mammals. It upgrades sodium ion concentration in the ECF by promoting reabsorption of sodium ions from renal tubules and excretion of potassium ions in urine.
: According to Kohlrausch law the molar conductivity of a strong electrolyte at infinite dilution is sum of molar conductivities of its ions. : The current carried by cation and anion is always equal.
A white source of light during interference forms only white and black fringes. Width of fringe is inversely proportional to the wavelength of the light used.
Downs syndrome is caused by an extra copy of chromosome number $21$. What percentage of offspring produced by an affected mother and a normal father would be affected by this disorder?
During translation initiation in prokaryotes, a $GTP$ molecule is needed in
An action potential in the nerve fibre is produced when positive and negative charges on the outside and the inside of the axon membrane are reversed, because
Patients suffering from cholera are given a saline drip because
Choose the correct sequence of stages of growth curve for bacetria
$E$. coli about to replicate was placed in a medium containing radioactive thynidine for five minutes. Then it was made to replicate in a normal medium. Which of the following observation will be correct?
An artificial pace-maker is implanted subcutaneously and connected to the heart in patients
Plasmids are suitable vectors for gene cloning because
In a given plant, red colour $(R)$ of fruits is dominant over white fruit $(r)$ : and tallness $(T)$ is dominant over dwarfness (t). If a plant with genotype $RRTt$ is crossed with a plant of genotype $rrtt$, what will be the percentage of tall plants with red fruits in the next generation?
$CH _{3} OC _{2} H _{5}$ and $\left( CH _{3}\right)_{3} C - OCH _{3}$ are treated with hydroiodic acid. The fragments after reactions obtained are
One mole of methanol when burnt in $O _{2}$, gives out $723\, kJ\, mol ^{-1}$ heat. If one mole of $O _{2}$ is used, what will be the amount of heat evolved?
Plexiglass is a commercial name of
The species having tetrahedral shape is