List of top Physics Questions asked in AIIMS

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

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 :

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 :

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

The circuit given below represents which of logic operations?

Given below is a circuit diagram of an $AM$ demodulator.

For good demodulation of $AM$ signal of carrier frequency $f$, the value of $R C$ should be :

Flash light equipped with a new set of batteries, produces bright white light. As the batteries wear out,

By sucking through a straw, a student can reduce the pressure in his lungs to $750\, mm$ of $Hg$ (density $= 13.6\, g/cm^3$ ). Using the straw, he can drink water from a glass upto a maximum depth of

In optical fibre, the diameter of the core is kept small. This smaller diameter of the core ensures that the fibre should have incident angle more than the critical angle required for total internal reflection.

Cobalt-$60$ is useful in cancer therapy Cobalt-$60$ is a source of $\gamma$-radiations capable of killing cancerous cells.

A thin stainless steel needle can lay floating on a still water surface. Any object floats when the buoyancy force balances the weight of the object.

In refraction, light waves are bent on passing from one medium to the second medium, because, in the second medium:

A wire mesh consisting of very small squares is viewed at a distance of $8 \,cm$ through a magnifying converging lens of focal length $10\, cm$, kept close to the eye. The magnification produced by the lens is

A lens is made of flint glass (refractive index $=1.5$ ). When the lens is immersed in a liquid of refractive index $1.25$, the focal length :

A judo fighter in order to throw his opponent on to the mat tries to initially bend his opponent and then rotate him around his hip. As the mass of opponent is brought closer to the fighter?s hip, the force required to throw the opponent is reduced.

If a street light of mass $M$ is suspended from the end of a uniform rod of length $L$ in different possible patterns as shown in figure, then :

An amplifier has a voltage gain $A_{v}=1000$. The voltage gain in $dB$ is :

${ }_{92}^{238} U$ has $92$ protons and $238$ nucleons. It decays by emitting an alpha particle and becomes:

Two spheres of same size, one of mass $2\, kg$ and another of mass $4 \,kg$, are dropped simultaneously from the top of Qutab Minar (height $=72\, m$ ). When they are $1 \,m$ above the ground, the two spheres have the same :

When a $p-n$ junction diode is reverse biased, then

A boat at anchor is rocked by waves whose crests are $100\, m$ apart and velocity is $25\, m/\sec$. The boat bounces up once in every

A leaf which contains only green pigments, is illuminated by a laser light of wavelength $0.6328\, \mu m$. It would appear to be :

In refraction, light waves are bent on passing from one medium to the second medium, because in the second medium