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

An electric dipole is placed at an angle of $30^{\circ}$ with an electric field intensity $2 \times 10^{5} N / C .$ It experiences a torque equal to $4\, Nm$. The charge on the dipole, if the dipole length is $2\, cm$, is

An electron of mass m and a photon have same energy E. The ratio of de-Broglie wavelengths associated with them is :

Consider the junction diode as ideal. The value of current flowing through \(AB\) is :

Electrons of mass $m$ with de-Broglie wavelength $\lambda$ fall on the target in an X-ray tube. The cutoff wavelength $(\lambda_0)$ of the emitted X-ray is

When a metallic surface is illuminated with radiation of wavelength $\lambda$ , the stopping potential is V. If the same surface is illuminated with radiation of wavelength $2 \lambda$, the stopping potential is $\frac{V}{4}$ . The threshold wavelength for the metallic surface is :

Three liquids of densities having the same value of surface tension $T$, rise to the same height in three identical capillaries. The angles of contact $\theta_{1}, \theta_{2}$ and $\theta_{3}$ obey-

Two cars $P$ and $Q$ start from a point at the same time in a straight line and their positions are represented by $x _{ P }( t )= at + bt ^{2}$ and $x _{ Q }( t )=f t - t ^{2}$. At what time do the cars have the same velocity ?

Two solenoids are given - 1st has 1 turn per unit length and 2nd has n turns per unit length. Ratio of magnetic fields at their centres is

A hydrogen atom is in an excited state of principal quantum number \( n \), it emits a photon of wavelength \( \lambda \), when it returns to the ground state. The value of \( n \) is

A marble block of mass 2 kg lying on ice when given a velocity of 6 m/s is stopped by friction in 10 s. Then the coefficient of friction is (Take \( g = 10 \, \text{m/s}^2 \))

A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is \( 4/3 \) and the fish is 12 cm below the surface, the radius of this circle (in cm) is

Two lenses of focal length \( f_1 = 10 \, \text{cm} \) and \( f_2 = -20 \, \text{cm} \) are kept as shown. The resultant power of combination will be

The half-life of radioactive Radon is 3.8 days. The time at the end of which \( \frac{1}{20} \)th of the radon sample will remain undecayed is given (using \( \log_e = 0.4343 \))

If the nuclear radius of \( ^{27}Al \) is 3.6 Fermi, the approximate nuclear radius of \( ^{64}Cu \) in Fermi is

An unpolarised beam of intensity \( I_0 \) is incident on a pair of nicols making an angle of \( 60^\circ \) with each other. The intensity of light emerging from the pair is

A metal ball of mass 2 kg moving with a velocity of 36 km/h has a head on collision with a stationary ball of mass 3 kg. If after the collision, the two balls move together, the loss in kinetic energy due to collision is

When a plastic thin film of refractive index 1.45 is placed in the path of one of the interfering waves then the central fringe is displaced through width of five fringes. The thickness of the film, if the wavelength of light is \( 5890 \, \text{Å} \), will be

The current in an \( L-R \) circuit builds up to \( 3/4 \) of its steady state value in 4 seconds. The time constant of this circuit is

A particle of charge \( q \) and mass \( m \) moves in a circular orbit of radius \( r \) with angular speed \( \omega \). The ratio of the magnitude of its magnetic moment to that of its angular momentum depends on

If \( i_1 = 3 \sin(\omega t) \) and \( i_2 = 4 \cos(\omega t) \), then \( i_3 \) is

The equation of AC voltage is \( E = 220 \sin(\omega t + \frac{\pi}{6}) \) and the AC current is \( I = 10 \sin(\omega t + \frac{\pi}{6}) \). The average power dissipated is

A current \( I \) flows in the anticlockwise direction through a square loop of side \( a \) lying in the \( xoy \)-plane with its center at the origin. The magnetic induction at the center of the square loop is given by

A long straight wire of radius \( R \) carries current \( i \). The magnetic field inside the wire at distance \( r \) from its centre is expressed as:

The magnetic flux in a closed circuit of resistance \(10 \, \Omega\) varies with time as \( \phi = (2t - 4t^2 + 1) \). The current in the loop will change its direction after a time of

A potentiometer circuit shown in the figure is set up to measure emf of cell E. As the point P moves from X to Y, the galvanometer G shows deflection always in one direction, but the deflection decreases continuously until Y is reached. The balance point between X and Y may be obtained by