List of top Physics Questions asked in AIIMS

In an experiment of Wheatstone bridge, a null point is obtained at the centre of the bridge wire. When a resistance of $10 \, \Omega $ is connected in one gap, the value of resistance in other gap is
Electric potential of earth is taken zero. No electric field exists on earth surface.
A radioactive nucleus is being produced at a constant rate $\alpha$ per second. Its decay constant is $\lambda$. If $N_0$ are the number of nuclei at time t = 0, then the maximum number of nuclei possible are
A conducting rod of length $l$ and mass $m$ is moving down a smooth inclined plane of inclination $\theta$ with constant velocity $v$. A current $i$ is flowing in the conductor in a direction perpendicular to paper inwards. A vertically upwards magnetic field $\vec{ B }$ exists in space. Then magnitude of magnetic field $\vec{ B }$ is
The bob of a simple pendulum is a ball full of water, if a fine hole is made in the bottom of the ball, the time period first increases and then decreases. As water flows out of the bob the weight of bob decreases.
Four charges are arranged at the corners of a square as shown in the figure. The direction of electric field at the centre of the square is along
What is the energy stored in the capacitor between terminals a and b of the network shown in the figure? (Capacitance of each capacitor C = 1 ??)
Neglecting the density of air, the terminal velocity obtained by a raindrop of radius $0.3\, mm$ falling through air of viscosity $1.8 \times 10^{-5}\, N \,s \,m ^{-2}$ will be
When a current is passed in a conductor, 3$^{\circ}$C rise in temperature is observed. If the strength of current is made thrice, then rise in temperature will approximately be
What is ratio of Bohr magneton to the nuclear magneton?
Three equal weights of $3\, kg$ each are hanging on a string passing over a frictionless pulley as shown in figure. The tension in the string between masses II and III will be (Take $g=10 \,m / sec ^{2}$ )
The ratio of intensities between two coherent sound sources is $4 : 1$. The difference of loudness in decibels between maximum and minimum intensities, when they interfere in space, is
The dimensions of specific resistance are
Reciprocal of impedance is
In Young's double slit experiment, the two slits act as coherent sources of equal amplitude a and of wavelength $\lambda$. In another experiment with the same set up, the two slits are sources of equal amplitude a and wavelength $\lambda$, but are incoherent. The ratio of intensities of light at the mid point of the screen in the first case to that in the second case is
Transformers are used only in alternating current source not in direct current. Only a.c. can be stepped up or down by means of transformers.
The dimensional formula for product of resistance and conductance is same as for dielectric constant. Both have dimensions of time constant.
Impulsive force is large and acts for a short time. Finite change in momentum should be produced by the force.
A total reflecting prism is used to erect the inverted image without deviation. Rays of light incident parallel to base of prism emerge out as parallel rays.
A proton and an alpha particle having the same kinetic energy are moving in circular paths in a uniform magnetic field. The radii of their circular pahts will be equal. Any two charged particles having equal kinetic energies and entering a region of uniform magnetic field $\vec{ B }$ in a direction perpendicular to $\vec{ B }$, will describe circular trajectories of equal radii.
A charge, whether stationary or in motion produces a magnetic field around it. Moving charges produce only electric field in the surrounding space.
A wire of length $l$ and mass m is bent in the form of a semicircle. The gravitational field intensity at the centre of semicircle is
A short linear object, of length $l$, lies along the axis of a concave mirror, of focal length $f$, at a distance $d$ from the pole of the mirror. The size of the image is then (nearly)
A convex lens of refractive index $\frac{3}{2}$ has a power of $2.5\, D$ in air. If it is placed in a liquid of refractive index $2$, then the new power of the lens is
An alternating current $i$ in an inductance coil varies with time according to the graph given below. Which one of the following graphs gives the variation of voltage with time?