List of top Physics Questions asked in VITEEE, NEET (UG)

Silver has a work function of \(4.7\,eV\). When ultraviolet light of wavelength \(180\,nm\) is incident upon it, potential of \(7.7\,V\) is required to stop photoelectrons reaching collector plate. The potential required to stop electrons when light of wavelength \(200\,nm\) is incident upon silver is
There are a \(25W-220V\) bulb and a \(100W-220V\) bulb. Which electric bulb will glow more brightly?
According to the Bohr's theory of hydrogen atom, the speed of the electron, energy and the radius of its orbit vary with the principal quantum number \(n\) respectively, as
Using an AC voltmeter the potential difference in the electrical line in a house is read to be \(234\,V\). If line frequency is known to be \(50\) cycles/s, the equation for the line voltage is
Two particles \(X\) and \(Y\) having equal charges, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describe circular paths of radii \(R_1\) and \(R_2\) respectively. The ratio of masses of \(X\) and \(Y\) is
Find the value of magnetic field between the plates of a capacitor at a distance \(1\,m\) from centre, where electric field varies by \(10^{10}\,V/m\) per second.
In space charged limited region, plate current in a diode is \(10\,mA\) for plate voltage \(150\,V\). If the plate voltage is increased to \(600\,V\), then the plate current will be
Light of wavelength \(\lambda\) strikes a photo-sensitive surface and electrons are ejected with kinetic energy \(E\). If the kinetic energy is to be increased to \(2E\), the wavelength must be changed to \(\lambda'\) where
The maximum velocity of electrons emitted from a metal surface is \(v\), when frequency of light falling on it is \(f\). The maximum velocity when frequency becomes \(4f\) is
The photoelectric plate is kept vertically above the emitter plate. Light source is put on and a saturation photo-current is recorded. An electric field is switched on which has a vertically downward direction, then
Sinusoidal carrier voltage of frequency \(1.5\,MHz\) and amplitude \(50\,V\) is amplitude modulated by a sinusoidal voltage of frequency \(10\,kHz\) producing \(50%\) modulation. Frequencies in lower and upper side-band are
\(50\,\Omega\) and \(100\,\Omega\) resistors are connected in series. This connection is connected with a battery of \(2.4\,V\). When a voltmeter of \(100\,\Omega\) resistance is connected across the \(100\,\Omega\) resistor, the reading of the voltmeter will be
A cylindrical conductor of radius \(R\) carries a current \(I\). The value of magnetic field at a point which is \(\dfrac{R}{4}\) distance inside from the surface is \(10\,T\). The value of magnetic field at a point which is \(4R\) distance outside the surface is
Zener diode is used for
Two light sources are said to be coherent if they are obtained from
A small coil is introduced between the poles of an electromagnet so that its axis coincides with the magnetic field direction. The number of turns is \(n\) and the cross-sectional area of the coil is \(A\). When the coil turns through \(180^\circ\) about its diameter, the charge flowing through the coil is \(Q\). The total resistance of the circuit is \(R\). What is the magnitude of the magnetic induction?
The attenuation of a calf fibre is mainly due to
An arc of radius \(r\) carries charge. The linear density of charge is \(\lambda\) and the arc subtends an angle \(\dfrac{\pi}{3}\) at the centre. What is electric potential at the centre?
Figure shows a straight wire length \(l\) carrying current \(i\). The magnitude of magnetic field produced by the wire at point \(P\) is
The electron of hydrogen atom is considered to be revolving round a proton in circular orbit of radius \(h^2/me^2\) with velocity \(e^2/h\), where \(h = h/2\pi\). The current \(i\) is
An electric dipole consists of two opposite charges of magnitude \(q = 1\times 10^{-6}\,C\) separated by \(2.0\,cm\). The dipole is placed in an external field of \(2\times 10^{5}\,NC^{-1}\). What maximum torque does the field exert on the dipole? How much work must an external agent do to turn the dipole end to end, starting from position of alignment (\(\theta = 0^\circ\))?
Which of the following rays is emitted by a human body?
A proton of mass \(1.67\times 10^{-27}\,kg\) enters a uniform magnetic field of \(1\,T\) at point \(A\) shown in figure with a speed of \(10^{7}\,m\,s^{-1}\). The magnetic field is directed perpendicular to the plane of the paper downwards. If the proton emerges out of the magnetic field at point \(C\), then the distance \(AC\) and the value of angle \(\theta\) will respectively be
A neutral water molecule (\(H_2O\)) in its vapour state has an electric dipole moment of magnitude \(6.4\times 10^{-30}\,C\,m\). How far apart are the molecules centres of positive and negative charges?
In Young's double slit experiment, the spacing between the slits is \(d\) and wavelength of light used is \(6000\,\text{\AA}\). If the angular width of a fringe formed on a distance screen is \(1^\circ\), the value of \(d\) is