List of top Physics Questions asked in NEET (UG)

In the reaction $^2_1H+^3_1H$ $\rightarrow$ $^4_2He+^1_0n,$ if the binding energies of $^2_1H$, $^3_1H$ and $^4_2He$ are respectively a, b and c (in MeV), then the energy (in MeV) released in this reaction is:

A photosensitive metallic surface has work function, hv₀. If photons of energy 2hv₀ fall on this surface, the electrons come out with a maximum velocity of 4x10⁶ m/s. When the photon energy is increased to 5hv₀, then maximum velocity of photoelectrons will be:

Which of the following processes is reversible?

The work functions for metals A,B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einstein's equation, the metals which will emit photoelectrons for a radiation of wavelength 4100 Å is/are:

A very long straight wire carries a current $l$. At the instant when a charge +Q at point P has velocity $\overrightarrow{v}$, as shown, the force on the charge is

If the angle between the vectors $ \overrightarrow{A}$ and $ \overrightarrow{B}$ is $\theta, $ the value of the product $ ( \overrightarrow{B} \times \overrightarrow{A}) \cdot \overrightarrow{A}$ is equal to

The displacement x of a particle varies with time t as $x=ae^{- \alpha t} + be ^{\beta t}$, where $a,b,$ $\alpha$ and $\beta$ are positive constants. The velocity of the particle will:

In a circuit, L,C and R are connected in series with an alternating voltage source of frequency f. The current leads the voltage by 45°.The value of C is:

The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 $\mathring{A}$ is of the order of

As a result of change in the magnetic flux linked to the closed loop as shown in the figure, an e.m.f. V volt is induced in the loop. The work done (joule) in taking a charge Q coulomb once along the loop is

A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distances of 2 m and 3 m respectively from the source. The ratio of the intensities of the waves at P and Q is

A ball is thrown vertically upward. It has a speed of 10m/s when it has reached one half of its maximum height. How high does the ball rise?(Taking g=10 m/s²)

The displacement x of a particle varies with time t as $x = ae^{-\alpha t}+be^{\beta t}$ where a, b, $\alpha$ and $\beta$ are positive constants. The velocity of the particle will

If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted ny $\mu_d, \mu_p$ and $\mu_f$ respectively, then

If $ {\lambda }_v , {\lambda }_x,{\lambda }_m $ represent the wavelengths of visible light, X-rays and microwaves respectively, then

An electron moves in a circular orbit with a uniform speed v. It produces a magnetic field B at the centre of the circle. The radius of the circle is proportional to:

A ball is thrown vertically upward. It has a speed of $10\ m/s$ when it has reached one half of its maximum height. How high does the ball rise?
(Take $g = 10\, m/s^2$)

An ideal gas heat engine operates in Carnot cycle between 227°C and 127°C. It absorbs 6 x 10⁴ cal of heat at higher temperature. Amount of heat converted to work is:

In any fission process the ratio $\frac{mass \, of \, fission \, products}{mass \, of \, parent \, nucleus} is$

Two batteries, one of emf 18 volts and internal resistance $2\, \Omega$ and the other of emf 12 volts and internal resistance $1\, \Omega$ are connected as shown. The voltmeter V will record a reading of

Which of the following circular rods,(given radius r and length l)each made of the same material and whose ends are maintained at the same temperature will conduct most heat?

When a wire of uniform cross-section a, length l and resistance R is bent into a complete circle, resistance between any two of diametrically opposite points will be