List of top Physics Questions asked in NEET (UG)

A plank with a box on it at one end is gradually raised about the other end. As the angle of inclination with the horizontal reaches 30$^{\circ}$, the box starts to slip and slides 4.0 m down the plank in 4.0 s The coefficients of static and kinetic friction between the box and the plank will be, respectively

Two stones of masses m and 2m are whirled in horizontal circles, the heavier one in a radius r/2 and the lighter one in radius r. The tangential speed of lighter stone is n times that of the value of heavier stone when they experience same centripetal forces. The value of n is

When two displacements represented by $ y_1 = a \sin \, (\omega \, t)$ and $ y_2 = b \, cos \, ( \omega \, t )$ are superimposed the motion is
The enolic form of ethyl acetoacetate as below has
The heart of a man pumps $5$ litres of blood through the arteries per minute at a pressure of $150 \,mm$ of mercury. If the density of mercury be $13.6 \times 10^3$ $kg/m^3$ and $g$ = $10\, m/s^2$ then the power
The fundamental frequency of a closed organ pipe of length $20\,cm$ is equal to the second overtone of an organ pipe open at both the ends. The length of organ pipe open at both the ends is
Copper of fixed volume $V$ is drawn into wire of length $l$. When this wire is subjected to a constant force $F$, the extension produced in the wire is $ \Delta l $. Which of the following graphs is a straight line?
A system consists of three masses m1, m2 and m3 connected by a string passing over a pulley P. The mass m1 hangs freely and m2 and m3 are on a rough horizontal table (the coefficient of friction = μ).
The pulley is frictionless and of negligible mass. The downward acceleration of mass m1 is:
(Assume m1=m2=m3=m)
A system consists of three masses m1, m2 and m3
The measured value of length of a simple pendulum is $20 \,cm$ known with $2 \,mm$ accuracy. The time for $50$ oscillations was measured to be $40 \,s$ with Is resolution. Calculate, the percentage accuracy in the determination of acceleration due to gravity $g$ from the above measurements.
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 index p, of the prism is
A certain number of spherical drops of a liquid of radius $r$ coalesce to form a single drop of radius $R$ and volume $V$. If $T$ is the surface tension of the liquid, then
Certain quantity of water cools from 70$^{\circ}$C to 60$^{\circ}$C in the first 5 minutes and to 54$^{\circ}$C in the next 5 minutes. The temperature of the surroundings is
The barrier potential of a $p-n$ junction depends on (1) type of semiconductor material (2) amount of doping (3) temperature Which one of the following is correct?
The ratio of the accelerations for a solid sphere (mass m and radius R) rolling down an incline of angle $ \theta $ without slipping and slipping down the incline without rolling is
The mean free path of molecules of a gas, (radius 'r') is inversely proportional to :
The binding energy per nucleon of \(Li\) and \(He\) nuclei are \(5.60\, MeV\) and \(7.06\, MeV\) respectively. In the nuclear reaction \(^7_3Li+_1^1H \rightarrow  _2^4He + _2^4He+Q\) the value of energy Q released is
A radioisotope X with a half life $1.4 \times 10^9$ 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
In the Young's double slit experiment, the intensity of light at a point on the screen where the path difference $\lambda$ is K,( $\lambda$ being the wavelength of light used). The intensity at a point where the path difference is ${\lambda}/4 $ will be
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:
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:
The mean free path of molecules of a gas, (radius 'r') is inversely proportional to:
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:
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]
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 certain number of spherical drops of a liquid of radius 'r' coalesce to form a single drop of radius 'R' and volume 'V'. If 'T' is the surface tension of the liquid, then: