NEET 1991 Physics Paper: AIPMT

The ground state energy of H-atom is 13.6 eV. The energy needed to ionize H-atom from its second excited state

The velocity of charge carriers of current (about 1 ampere) in a metal under normal conditions is of the order of

An electron with (rest mass $m_0$) moves with a speed of $0.8\,c$. Its mass when it moves with this speed is

Photoelectric work function of a metal is 1 eV. Light of wavelength $\lambda$ = 3000 Å falls on it. The photo electrons come out with a maximum velocity

The wavelength of a 1 keV photon is $1.24 \times 10^{-9}$ m. What is the frequency of 1 MeV photon?

Faraday's laws are consequence of conservation of

A magnetic field of $2 \times 10^{-2}\text{ T}$ acts at right angles to a coil of area $100\text{ cm}^{2}$, with 50 turns. The average e.m.f. induced in the coil is 0.1 V, when it is removed from the field in $t$ sec. The value of $t$ is

If the number of turns per unit length of a coil of solenoid is doubled, the self-inductance of the solenoid will

A 100 millihenry coil carries a current of 1 A. Energy stored in its magnetic field is

The frequency of electromagnetic wave, which best suited to observe a particle of radius $3 \times 10^{-4}\text{ cm}$ is of the order of

The satellite of mass $m$ is orbiting around the earth in a circular orbit with a velocity $v$. What will be its total energy?

When milk is churned, cream gets separated due to

Physical independence of force is a consequence of

A heavy uniform chain lies on horizontal table top. If the coefficient of friction between the chain and the table surface is 0.25, then the maximum fraction of the length of the chain that can hang over one edge of the table is

A car moves a distance of 200 m. It covers the first half of the distance at speed 40 km/h and the second half of distance at speed $v$. The average speed is 48 km/h. The value of $v$ is

A bus travelling the first one-third distance at a speed of 10 km/h, the next one-third at 20 km/h and at last one-third at 60 km/h. The average speed of the bus is

A uniform magnetic field acts right angles to the direction of motion of electrons. As a result, the electron moves in a circular path of radius $2\text{ cm}$. If the speed of electrons is doubled, then the radius of the circular path will be

A deuteron of kinetic energy $50\text{ keV}$ is describing a circular orbit of radius $0.5$ metre in a plane perpendicular to magnetic field $B$. The kinetic energy of the proton that describes a circular orbit of radius $0.5$ metre in the same plane with the same $B$ is

The half life of radium is 1600 years. The fraction of a sample of radium that would remain after 6400 years

The constituents of atomic nuclei are believed to be

In the nucleus of ${}_{11}\text{Na}^{23}$, the number of protons, neutrons and electrons are

If the nuclear force between two protons, two neutrons and between proton and neutron is denoted by $F_{pp}, F_{nn}$ and $F_{pn}$ respectively, then

The angular velocity and the amplitude of a simple pendulum is $\omega$ and $a$ respectively. At a displacement $x$ from the mean position if its kinetic energy is $T$ and potential energy is $V$, then the ratio of $T$ to $V$ is

A simple pendulum is suspended from the roof of a trolley which moves in a horizontal direction with an acceleration $a$, then the time period is given by $T = 2\pi\sqrt{(l/g)}$, where $g$ is equal to

A body is executing simple harmonic motion. When the displacements from the mean position is $4\text{ cm}$ and $5\text{ cm}$, the corresponding velocities of the body is $10\text{ cm/sec}$ and $8\text{ cm/sec}$. Then the time period of the body is

A beam of monochromatic light is refracted from vacuum into a medium of refractive index 1.5. The wavelength of refracted light will be

Green light wavelength 5460 Å is incident on an air-glass interface. If the refractive index of glass is 1.5, the wavelength of light in glass would be ($c = 3 \times 10^{8}\text{ m s}^{-1}$)

A particle of mass $m = 5$ is moving with a uniform speed $v = 3\sqrt{2}$ in the $XOY$ plane along the line $Y = X + 4$. The magnitude of the angular momentum of the particle about the origin is

If a sphere is rolling, the ratio of the translational energy to total kinetic energy is given by

To use a transistor as an amplifier

The following truth table corresponds to the logical gate

The depletion layer in the p-n junction region is caused by

Three containers of the same volume contain three different gases. The masses of the molecules are $m_1, m_2$ and $m_3$ and the number of molecules in their respective containers are $N_1, N_2$ and $N_3$. The gas pressure in the containers are $P_1, P_2$ and $P_3$ respectively. All the gases are now mixed and put in one of these containers. The pressure $P$ of the mixture will be

Relation between pressure ($P$) and energy ($E$) of a gas is

For hydrogen gas $C_P - C_V = a$ and for oxygen gas $C_P - C_V = b$, so the relation between $a$ and $b$ is given by

A thermodynamic process is shown in the figure. The pressure and volumes corresponding to some points in the figure are $P_A = 3 \times 10^{4}\text{ Pa}$; $V_A = 2 \times 10^{-3}\text{ m}^3$; $P_B = 8 \times 10^{4}\text{ Pa}$; $V_D = 5 \times 10^{-3}\text{ m}^3$. In the process $AB$, 600 J of heat is added to the system and in process $BC$, 200 J of heat is added to the system. The change in internal energy of the system in process $AC$ would be

A certain body weighs 22.42 g and has a measured volume of 4.7 cc. The possible error in the measurement of mass and volume are 0.01 g and 0.1 cc. Then maximum error in the density will be

The dimensional formula of permeability of free space $\mu_0$ is

Two trains move towards each other with the same speed. The speed of sound is $340\text{ m/s}$. If the height of the tone of the whistle of one of them heard on the other changes to $9/8$ times, then the speed of each train should be

A closed organ pipe (closed at one end) is excited to support the third overtone. It is found that air in the pipe has

Ratio of intensities of two waves are given by 4: 1. Then ratio of the amplitudes of the two waves is

In Young's experiment, two coherent sources are placed 0.90 mm apart and fringe are observed one metre away. If it produces second dark fringe at a distance of 1 mm from central fringe, the wavelength of monochromatic light used would be