List of top Questions asked in NEET (UG)

A transformer having efficiency of 90% is working on 200 V and 3 kW power supply. If the current in the secondary coil is 6 A, the voltage across the secondary coil and the current in the primary coil respectively are:
The oscillation of a body on a smooth horizontal surface is represented by the equation,
X = A cos (ωt)
where X = displacement at time t
        ω = frequency of oscillation
Which one of the following graphs shows correctly the variation 'a' with 't'?
Here a acceleration at time t
T = time period
Light with an energy flux of 25 × 104 Wm-2 falls on a perfectly reflecting surface at normal incidence. If the surface area is 15 cm2, the average force exerted on the surface is:
When the energy of the incident radiation is increased by 20%, the kinetic energy of the photoelectrons emitted from a metal surface increased from 0.5 eV to 0.8 eV. The work function of the metal is
A radio isotope 'X' with a half life 1.4 × 109 years decays to 'Y' which is stable. A sample of the rock from a cave was found to contain 'X' and 'Y' in the ratio 1:7. The age of the rock is:
The given graph represents V – I characteristic for a semiconductor device
graph represents V – I characteristic for a semiconductor device
Which of the following statement is correct?
Following figures show the arrangement of bar magnets in different configurations. Each magnet has magnetic dipole moment \(\overrightarrow{m}\). Which configuration has highest net magnètic dipole moment?
figures show the arrangement of bar magnets in different configurations
A speeding motorcyclist sees traffic jam ahead of him. He slows down to 36 km/hour. He finds that traffic has eased and a car moving ahead of him at 18 km/hour is honking at a frequency of 1392 Hz. If the speed of sound is 343 m/s, the frequency of the honk as heard by him will be :
A body of mass (4m) is lying in x-y plane at rest. It suddenly explodes into three pieces. Two pieces, each of mass (m) move perpendicular to each other with equal speeds (v). The total kinetic energy generated due to explosion is :
To obtain virus - free healthy plants from a diseased one by tissue culture technique, which part/parts of the diseased plant will be taken?
Steam at 100°C is passed into 20 g of water at 10°C. When water acquires a temperature of 80°C, the mass of water present will be:
[Take specific heat of water = 1 cal g-1°C-1 and latent heat of steam = 540 cal g-1]
The mean free path of molecules of a gas, (radius 'r') is inversely proportional to:
A solid cylinder of mass 50 kg and radius 0.5 m is free to rotate about the horizontal axis. A massless string is wound round the cylinder with one end attached to it and other hanging freely. Tension in the string required to produce an angular acceleration of 2 revolutions s-2 is:
A black hole is an object whose gravitational field is so strong that even light cannot escape from it. To what approximate radius would earth (mass = 5.98 x 1024 kg) have to be compressed to be a black hole?
Hydrogen atom in ground state is excited by a monochromatic radiation of λ = 975 \(\mathring{A}\). Number of spectral lines in the resulting spectrum emitted will be:
Certain quantity of water cools from 70°C to 60°C in the first 5 minutes and to 54°C in the next 5 minutes. The temperature of the surroundings is:
The force F acting on a particle of mass m is indicated by the force-time graph shown below. The change in momentum of the particle over the time interval from zero to 8s is
The force F acting on a particle of mass m
If the kinetic energy of the particle is increased to 16 times its previous value, the percentage change in the de-Broglie wavelength of the particle is :
The barrier potential of a p-n junction depends on:
(a) type of semi conductor material
(b) amount of doping
(c) temperature
Which one of the following is correct?
If force (F), velocity (V) and time (T) are taken as fundamental units, then the dimensions of mass are:
The Binding energy per nucleon of \(^7_3Li\) and \(^4_2He\) nuclei are 5.60 MeV and 7.06 MeV, respectively. In the nuclear reaction \(^7_3Li + ^1_1H \rightarrow ^4_2He + ^4_2He+Q\), the value of energy Q released is:
Dependence of intensity of gravitational field (E) of earth with distance (r) from centre of earth is correctly represented by
If the focal length of objective lens is increased then magnifying power of:
The angle of a prism is 'A'. One of its refracting surfaces is silvered. Light rays falling at an angle of incidence 2A on the first surface returns back through the same path after suffering reflection at the silvered surface. The refractive indexµ, of the prism is
In an ammeter 0.2% of main current passes through the galvanometer. If resistance of galvanometer is G, the resistance of ammeter will be: