List of top Physics Questions asked in NEET (UG)

Ratio of longest wavelengths corresponding to Lyman and Balmer series in hydrogen spectrum is

In Young's double slit experiment, the slits are 2 mm apart and are illuminated by photons of two wavelengths, $λ_1$ =12000 Å and $λ_2$= 10000 Å. At what minimum distance from the common central bright fringe on the screen 2 m from the slit will a bright fringe from one interference patter coincide with a bright fringe from the other?

A coil of self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when

A fluid is in streamline flow across a horizontal pipe of variable area of cross section. For this which of the following statements is correct?

One coolie takes 1 minute to raise a suitcase through a height of 2 m but the second coolie takes 30 s to raise the same suitcase to the same height. The powers of two coolies are in the ratio

For photoelectric emission from certain metal the cutoff frequency is v. If radiation of frequency 2v impinges on the metal plate, the maximum possible velocity of the emitted electron will be (m is the electron mass) :

Ten identical cells connected in series are needed to heat a wire of length one meter and radius 'r' by $10^\circ C$ in time 't'. How many cells will be required to heat the wire of length two meter of the same radius by the same temperature in time 't' ?

The density of water at $20^{\circ}C$ is $998\, kg/m^3 $ and at $40^{\circ}C$ $992\,kg/m^3 $. The coefficient of volume expansion of water is

The ratio of radii of gyration of a circular ring and a circular disc, of the same mass and radius, about an axis passing through their centres and perpendicular to their planes are :

Two plane mirrors are inclined at 70$^{\circ}$. A ray incident on one mirror at angle, $\theta$ after reflection falls on second mirror and is reflected from there parallel to first mirror. The value of $\theta$ is

The pair of quantities having same dimensions is

The amount of heat energy required to raise the temperature of 1 g of Helium at NTP, from $T_1 K$ to $T_2 K$ is :

Two discs are rotating about their axes, normal to the discs and passing through the centres of the discs. Disc $D_1 $ has 2 kg mass and 0.2 m radius and initial angular velocity of $ 50\, rad \,s^{-1}.$ Disc $ D_2 $ has 4 kg mass, 0.1 m radius and initial angular velocity of $ 200\, rad\, s^{-1} $. The two discs are brought in contact face to face, with their axes of rotation coincident. The final angular velocity (in rad $ s^{-1}$ ) of the system is

A certain mass of Hydrogen is changed to Helium by the process of fusion. The mass defect in fusion reaction is 0.02866 u. The energy liberated per u is : (given 1u = 931 MeV)

The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied ?

The wettability of a surface by a liquid depends primarily on

If the ratio of diameters, lengths and Young's modulus of steel and copper wires shown in the figure are $p, q$ and $s$ respectively, then the corresponding ratio of increase in their lengths would be :

Ratio of longest wavelengths corresponding to Lyman and Balmer series in hydrogen spectrum is :

The reddish appearance of the sun at sunrise and sunset is due to

When the number of nucleons in a nuclues increases the binding energy per nucleons ?

Two pith balls carrying equal charges are suspended from a common point by strings of equal length, the equilibrium separation between them is $r$. Now the strings are rigidly clamped at half the height. The equilibrium separation between the balls now become :

A stone falls freely under gravity. It covers distances $h_1, h_2$ and $h_3$ in the first 5 seconds, the next 5 seconds and the next 5 seconds respectively. The relation between $h_1, h_2$ and $h_3$ is :-

A rod PQ of mass M and length L is hinged at end P. The rod is kept horizontal by a massless string tied to point Q as shown in figure. When string is cut, the initial angular acceleration of the rod is:

An electromagnetic wave of frequency $ \upsilon $ = 3.0 MHz passes from vacuum into a dielectric medium with relative permittivity $\varepsilon$ = 4.0. Then