List of top Questions asked in AIIMS

The primary and secondary coils of a transformer have $50$ and $1500$ turns respectively. If the magnetic flux $\phi$ linked with the primary coil is given by $\phi=\phi_{0}+4t$, where $\phi$ is in weber, $\phi$ is time in second and $\phi_{0}$ is a constant, the output voltage across the secondary coil is

A particle executes simple harmonic oscillation with an amplitude $'a'$. The period of oscillation is $'T'$. The minimum time taken by the particle to travel half of the amplitude from the equilibrium position is

The resistance of an ammeter is $13\, \Omega$ and its scale is graduated for a current upto $100\, A .$ After an additional shunt has been connected to this ammeter it becomes possible to measure currents upto $750\, A$ by this meter . The value of shunt resistance is

In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is a/an

A particle starting from the origin $(0,0)$ moves in a straight line in the $(x, y)$ plane. Its coordinates at a later time are $(\sqrt{3}, 3)$. The path of the particle makes with the $x$-axis an angle of

If the cold junction of a thermo-couple is kept at $0^{\circ} C$ and the hot junction is kept at $T^{\circ} C$, then the relation between neutral temperature $\left(T_{n}\right)$ and temperature of inversion $\left(T_{i}\right)$ is

Among the following, the species having square planar geometry for central atom are: (i) $XeF _{4}$ (ii) $SF _{4}$ (iii) $\left[ NiCl _{4}\right]^{2-}$ (iv) $\left[ PtCl _{4}\right]^{2-}$

Anilinium chloride is more acidic than ammonium chloride. Anilinium chloride is resonance stabilised.

The pair in which both species have same magnetic moment (spin only value) is

Circular loop of a wire and a long straight wire carry currents $I _{ c }$ and $I _{ e }$, respectively as shown in figure. Assuming that these are placed in the same plane. The magnetic field will be zero at the centre of the loop when the separation $H$ is :

A $5 \%$ solution (by mass) of cane sugar in water has freezing point of $271 \,K$ and freezing point of pure water is $273.15 \,K$. The freezing point of a $5 \%$ solution (by mass) of glucose in water is

The water pouch of instant cold pack for treating athletic injuries breaks when squeezed and $NH_4NO_3$ dissolves lowering the temperature. Addition of nonvolatile solute into solvent results into depression of freezing point of solvent.

According to transition state theory, for the formation of an activated complex, one of the vibrational degrees of freedom is converted into a translational degree of freedom. Energy of the activated complex is higher than the energy of reactant molecules.

The spatial distribution of the electric field due to two charges $(A, B)$ is shown in figure. Which one of the following statements is correct?

Five capacitors, each of capacitance value $C$ are connected as shown in the figure. The ratio of capacitance between $P$ and $R$, and the capacitance between $P$ and $Q$, is :

Among the following which one can have a meso form?

$40\, ml$ of $0.1\, M$ ammonia solution is mixed with $20 \,ml$ of $0.1\, M\, HCl$. What is the $pH$ of the mixture? $\left( p K_{b}\right.$ of ammonia solution is $\left.4.74\right)$

"Ordines Anomali" of Bentham and Hooker includes

Nitrobenzene on treatment with zinc dust and aqueous ammonium chloride gives

Methyl- $\alpha-D$-glucoside and methyl $-\beta-D$-glucoside are

Which of the following compounds has the highest boiling point?

What is common between chloroplasts, chromoplasts and leucoplasts ?

The moment of inertia of a rod about an axis through its centre and perpendicular to it is $\frac{1}{12} ML ^{2}$ (where $M$ is the mass and $L$, the length of the rod). The rod is bent in the middle so that the two halves make an angle of $60^{\circ}$. The moment of inertia of the bent rod about the same axis would be :

The incorrect statement among the following is

The energy gaps $(E_g)$ between valence band and conduction band for diamond, silicon and germanium are in the order