List of top Questions asked in AIIMS- 2007

Which of the following is true?

In the diagram shown below all three rods are of equal length $L$ and equal mass $M$. The system is rotated such that rod $B$ is the axis. What is the moment of inertia of the system?

The half-life for the reaction $N _{2} O _{5} \longrightarrow 2 NO _{2}+\frac{1}{2} O _{2}$ is $2.4\, h$ at STP. Starting with $10.8\, g$ of $N _{2} O _{5}$ how much oxygen will be obtained after a period of $9.6\, h$ ?

The solubility product of $As _{2} O _{3}$ is $10.8 \times 10^{-9}$. It is $50 \%$ dissociated in saturated solution. The solubility of salt is

The enthalpy of hydrogenation of cyclohexene is $-119.5\, kJ\, mol ^{-1}$. If resonance energy of benzene is $-150.4\, kJ\, mol ^{-1}$, its enthalpy of hydrogenation would be

The phase difference between the instantaneous velocity and acceleration of a particle executing simple harmonic motion is

Drosophila flies with $XXY$ genotype are females, but human beings with such genotype are abnormal males, it shows that

Pure line breed refers to

Chain transfer reagent is

The figure shows the path of a positively charged particle 1 through a rectangular region of uniform electric field as shown in the figure. What is the direction of electric field and the direction of deflection of particles 2, 3 and 4?

Ohm?? law is applicable for all conducting elements. Ohm?? law is a fundamental law.

The vapour pressure of pure benzene at a certain temperature is $0.850$ bar. A non-volatile, nonelectrolyte solid weighing $0.5\,g$ is added to $39.0\, g$ of benzene (molar mass 78 g/mol). The vapour pressure of the solution then is 0.845 bar. What is the molecular mass of the solid substance?

A large horizontal surface moves up and down in $S.H.M.$ with an amplitude of $1\, cm$. If a mass of $10\, kg$ (which is placed on the surface) is to remain continuously in contact with it, the maximum frequency of S.H.M. will be

In a cavity within a conductor, the electric field is zero. Charges in a conductor reside only at its surface.

: In the electrolysis of aqueous $ NaCl $ , $ Na $ is preferentially discharged at mercury cathode forming sodium amalgam. : It is due to the fact that hydrogen has a high over voltage at mercury cathode.

Which of the following statement is true?

The lactic acid shows the geometrical isomerism. Lactic acid has carbon-carbon double bond.

Mixture of $CH_3COOH$ and $CH_3COONH_4$ is an example of acidic buffer. Acidic buffer contains equimolar mixture of weak acid and its salt with weak base.

Plexiglass is a commercial name of

Rayon is

Propene on hydroboration and oxidation produces

"Omnis-cellula-e-cellula" was given by

In maize, hybrid vigour is exploited by

At the high pressure, Langmuir adsorption isotherm takes the form