Official NEET UG 1999 Test

The K.E. of a person is just half of K.E. of a boy whose mass is just half of that person. If person increases its speed by 1 m/s, then its K.E. equals to that of boy then initial speed of person was –

Zener diode is used as –

Two particles separated at a horizontal distance X as shown in fig. they projected at the same line as shown in fig. with different initial speeds. The time after which the horizontal distance between them become zero –

Depletion layer has (for an unbiased PN junction) –

For a particle displacement time relation is t = \(\sqrt{x}\) + 3. Its displacement when its velocity is zero –

A cylindrical tube (L = 125 cm) is resonant with a tuning fork of frequency 330 Hz. If it is filling by water then to get resonance again, minimum length of water column is (V\( _{air} \) = 330 m/s) –

If 100N force is applied to 10 kg. block as shown in diagram then acceleration produced for slab –

Initial pressure and volume of a gas are P and V respectively. First its volume is expanded to 4V by isothermal process and then again its volume makes to be V by adiabatic process then its final pressure is (γ = 1.5) –

The current in 8Ω resistance is (See fig.)

A sphere maintained at temperature 600 K, has cooling rate R in an external environment of 200 K temp. If its temp. falls to 400 K then its colling rate will be

The effective capacity of the network between terminals A and B is –

A particle is projected with velocity ‘u’ makes an angle θ w.r.t. horizontal. Now it breaks in
two identical parts at highest point of trajectory. If one part is retrace its path, then velocity of
other part is

If the power dissipated in 5Ω is 20 W then power dissipated in 4Ω is –

The amplitude of a S.H.O. reduces to 1/3 in first 20 secs. then in first 40 sec. its amplitude
becomes

The value of R for which power in it is maximum-

Two springs A and B (K\(_A\) = 2 K\(_B\)) are stretched by same suspended weights then ratio of work done in stretching is

Initially plane of coil is parallel to the uniform magnetic field B. In time ?t it makes to perpendicular to the magnetic field, then charge flows in ?t depends on this time as –

A spring elongated by length ‘L’ when a mass ‘M’ is suspended to it. Now a tiny mass ‘m’ is attached and then released, its time period of oscillation is –

A current carrying coil (I = 5A, R = 10 cm.) having 50 number of turns find field at its centre-

Frequency of simple pendulum in a free falling lift is –

Eight equals charged tiny drops are combined to form a big drop. If the potential on each drop is 10V then potential of big drop will be –

The energy and capacity of a charged parallel plate capacitor are E and C respectively. Now a dielective slab of ∈\(_r\) = 6 is inserted in it then energy and capacity becomes (Assuming charge on plates remains constant)

For a inductor coil L = 0.04 H, then workdone by source to establish a current of 5A in it is –

The current conduction in a discharge tube is due to

The terminal potential difference of a cell is greater than its emf when –

A light of amplitude A and wavelength λ is incident on a metallic surface, then saturation current flows is proportional to (assume cut off wave length = λ\(_0\)

In millikan oil drop experiment a charged drop falls with a terminal velocity V. If an electric field E is applied vertically upwards it moves with terminal velocity 2V in upward direction. If electric field reduces to E/2 then its terminal velocity will be –

Light of wavelength 3000 Å in Photoelectric effect gives electron of max. K.E. 0.5 eV. If wavelength change to 2000 Å then max. K.E. of emitted electrons will be :

The error in measurement of radius of a sphere is 0.1% then error in its volume is –

For a vibration magnetometer, the time period of suspended bar magnet can be reduced by –

The K.E. of electron and photon is same then relation between their De-Broglie wavelength :

A body starts falling from height ‘h’ and travels distance h/2 during last second of motion then time of flight is (In second) –

The truth table for the following network is :

The total energy of an electron is 3.555 MeV,then its Kinetic energy is :