List of top Physics Questions asked in JEE Advanced

A car is moving in a circular horizontal track of radius $10\,m$ with a constant speed of $10\, m/s$. A plumb bob is suspended from the roof of the car by a light rigid rod. The angle made by the rod with the vertical is $(Take \,g \,=\, 10 m/s^2)$
In an n-p-n transistor circuit, the collector current is 10 mA. If 90% of the electrons emitted reach the collector
A planet is observed by an astronomical refracting telescope having an objective of focal length 16 m and an eyepiece of focal length 2 cm
When a monochromatic point source of light is at a distance of 0.2 m from a photoelectric cell, the cut-off voltage and the saturation current are respectively 0.6 V and 18.0 mA. If the same source is placed 0.6 m away from the photoelectric cell, then
The displacement $y$ of a particle, if given by $y=4 \cos ^{2}(t / 2) \sin (1000 t)$. This expression may be considered to be a result of the superposition of how many simple harmonic motions?
A cylindrical tube open at both the ends has a fundamental frequency of $390\,Hz$ in air. If $1/4^{th}$ of the tube is immersed vertically in water the fundamental frequency of air column is
The moment of inertia of a thin square plate $A B C D$, of uniform thickness about an axis passing through the centre $O$ and perpendicular to the plane of the plate is where $I_{1}, I_{2}, I_{3}$ and $I_{4}$ are respectively moments of inertia about axes $1,2,3$ and $4$ which are in the plane of the plate
A microammeter has a resistance of $100 \Omega$ and full scale range of $50 \mu A$. It can be used as a voltmeter or as a higher range ammeter provided a resistance is added to it. Pick the correct range and resistance combination (s)
Two identical straight wires are stretched so as to produce 6 beats/s when vibrating simultaneously. On changing the tension slightly in one of them, the beat frequency remains unchanged. Denoting by $T_1,T_2$ the higher and the lower initial tension in the strings, then it could be said that while making the above changes in tension
A uniform bar of length 6 a and mass 8 m lies on a smooth horizontal table. Two point masses m and 2m moving in the same horizontal plane with speed 2vand v respectively, strike the bar [as shown in the figure] and stick to the bar after collision. Denoting angular velocity (about the centre of mass), total energy and centre of mass velocity by $?$, E and $v_c$ respectively, we have after collision
When an ideal diatomic gas is heated at constant pressure the fraction of the heat energy supplied which increases the internal energy of the gas is
A uniform cylinder of length L and mass M having cross-sectional area A is suspended, with its length vertical, from a fixed point by a massless spring, such that it is half-submerged in a liquid of density p at equilibrium position. When the cylinder is given a small downward push and released it starts oscillating vertically with a small amplitude. If the force constant of the spring is k, the frequency of oscillation of the cylinder is
A thin prism $P_1$ with angle $4^\circ$ and made from glass of refractive index 1.54 is combined with another thin prism $P_2$ made from glass of refractive index 1.72 to produce dispersion without deviation. The angle of the prism $P_2$ is
A wave is represented by the equation ; $\, \, \, \, \, y=A \sin (10 \pi x+15 \pi l+ \pi /3) $ where, x is in metre and t is in second. The expression represents
A particle of mass m is projected with a velocity v making an angle of 45$^{\circ}$ with the horizontal. The magnitude of the angular momentum of the projectile about the point of projection when the particle is at its maximum height h is
An astronomical telescope has an angular magnification of magnitude 5 for far objects. The separation between the objective and the eyepiece is 36 cm and the final image is formed at infinity. The focal length $f_o$ of the objective and the focal length $f_e$ of the eyepiece are
A conducting square loop of side L and resistance R moves in its plane with a uniform velocity v perpendicular to one of its sides. A magnetic induction B, constant in time and space, pointing perpendicular to and into the plane of the loop exists everywhere.The current induced in the loop is
Two identical p-n junctions may be connected in series with a battery in three ways . The potential drops across the two p-n junctions are equal in
Imagine a light planet revolving around a very massive star in a circular orbit of radius R with a period of revolution T. If the gravitational force of attraction between the planet and the star is proportional to $ R^{-5/2} $ , then
For an ideal gas
The impurity atoms with which pure silicon should be doped to make a p-type semiconductor are those of
Two particles X and Y having equal charges, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describe circular paths of radii $R_1$ and $R_2$ respectively. The ratio of the mass of X to that of Y is
Two bodies M and N of equal masses are suspended from two separate massless springs of spring constants kx and k2 respectively. If the two bodies oscillate vertically such that their maximum velocities are equal, the ratio of the one amplitude of vibration of M to that of N is
A freshly prepared radioactive source of half-life 2 h emits radiation of intensity which is 64 times the permissible safe level. The minimum time after which it would be possible to work safely with this source is
If one mole of a monoatomic gas ($\gamma$ = 5/ 3) is mixed with one mole of a diatomic gas ($\gamma$ = 7 / 5), the value of $\gamma$ for the mixture is