List of top Physics Questions asked in AIIMS

Mutual inductance of two coils can be increased by

Use of ball bearings between two moving parts of a machine is a common practice. Ball bearings reduce vibrations and provide good stability

The speedometer of an automobile measures the average speed of the automobile. Average velocity is equal to total distance divided by total time taken.

In a common emitter transistor amplifier, the input current is much less than the output current than output impedance. The common emitter transistor amplifier has higher input impedance than output impedance

A secondary rainbow have inverted colours than the primary rainbow. The secondary rainbow is formed by single total internal reflection.

A string $0.5\, m$ long is used to whirl a $1\,kg$ stone in a vertical circle at a uniform velocity of $5 \,m \,s^{-1}$. What is the tension in the string when the stone is at the top of the circle?

The angles of dip at the poles and the equator respectively are

A hemispherical bowl of radius $r$ is set rotating about its axis of symmetry in vertical. A small block kept in the bowl rotates with the bowl without slipping on its surface. If the surface of the bowl is smooth and the angle made by the radius through the block with the vertical is $\theta$, then find the angular speed at which the ball is rotating.

In terms of basic units of mass $(M)$, length $(L)$, time $(T) $ and charge $(Q)$, the dimensions of magnetic permeability of vacuum $(\mu_0)$ would be

Two spherical nuclei have mass numbers $216$ and $64$ with their radii $R_{1}$ and $R_{2}$ respectively. The ratio, $\frac{R_{1}}{R_{2}}$ is equal to

A semiconductor having electron and hole mobilities $\mu_{n}$ and $\mu_{p}$ respectively. if its intrinsic carrier density is $n_{i}$, then what will be the value of hole concentration $P$ for which the conductivity will be minimum at a given temperature?

A massless rod $S$ having length $2 l$ has equal point masses attached to its two ends as shown in figure. The rod is rotating about an axis passing through its centre and making angle $\alpha$ with the axis. The magnitude of change of momentum of rod i.e. $\left|\frac{d L}{d t}\right|$ equals

A uniform disc is acted by two equal forces of magnitude $F$. One of them, acts tangentially to the disc, while other one is acting at the central point of the disc. The friction between disc surface and ground surface is $n F$. If $r$ be the radius of the disc, then the value of $n$ would be (in $N$)

The Boolean expression $P+\bar{P} Q$, where $P$ and $Q$ are the inputs of the logic circuit, represents

A uniform metallic rod rotates about its perpendicular bisector with constant angular speed. If it is heated uniformly to raise its temperature slightly, then

While keeping area of cross-section of a solenoid same, the number of turns and length of solenoid one both doubled. The self inductance of the coil will be

The time period of a particle undergoing SHM is 16 s. It starts motion from the mean position. After 2 s, its velocity is 0.4 m s. The amplitude is

A long straight wire carries 10 $A \,d.c$. current an electron travels perpendicular to the plane of this wire at a distance $0.1\, m$ with velocity $5.0 \times10^6 m \,s^{-1}$. Force acting on the electron due to current in wire is

A rod of length $L$ is hinged from one end. It is brought to a horizontal position and released. The angular velocity of the rod, when it is in vertical position is

In a uniform electric field a charge of $3\, C$ experiences a force of $3000\, N$. The potential difference between two points $1\, cm$ apart along the electric line of force will be

The most suitable metal for making electromagnets and transformer cores is

Resolving power of reflecting microscope increases with

Two waves represented by $y\, =\, asin(\omega\,t - kx)$ and $y \,= \,acos(\omega\,t - kx)$ are superposed. The resultant wave will have an amplitude

Two parallel long wires A and B carry currents $i_1$ and $i_2 (< i_1)$. When $i_1$ and $i_2$ are in the same direction, the magnetic field at a point mid way between the wires is $10 \,\mu\,T$. If $i_2$ is reverse the field becomes $30\, \mu T$. The ratio $i_1/i_2$ is

Two conducting circular loops of radii $R_{1}$ and $R_{2}$ are placed in the same plane with their centres coinciding. If $R_{1} >\, R_{2}$ the mutual inductance $M$ between them will be directly proportional to