List of top Questions asked in AIIMS- 2007

Voltmeter is connected in parallel with the circuit Resistance of a voltmeter is very large.
: The true nucleus is generally absent in E. coli and other prokaryotes : An undifferentiated, unorganized fibrillar nucleus without any limiting membrane is observed in prokaryotic cells
The position of an element in periodic table after emission of one $\alpha$ - and two $\beta$ - particles remains unchanged. Emission of one $\alpha$ - and two $\beta$ - particles give isotope of the element which acquires same position in periodic table.
: The conversion of fresh precipitate to colloidal state is called peptization. : It is caused by addition of common ions.
Secreting hypotonic urine is effective in reducing urinary loss of water. Hypotonic urine is more concentrated and higher in osmotic pressure than the blood.
Ozone is an allotrope of oxygen. Oxygen is bluish colour liquid and in singlet state it is more paramagnetic.
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.
During translation initiation in prokaryotes, a $GTP$ molecule is needed in
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?
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
An artificial pace-maker is implanted subcutaneously and connected to the heart in patients
$E$. 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?