List of top Physics Questions asked in BITSAT

A 12.5 eV electron beam is used to bombard gaseous hydrogen at room temperature. The number of spectral lines emitted will be:
A charged particle is moving in a uniform magnetic field \( \mathbf{B} = 2\hat{i} + 3\hat{j} \) T. If it has an acceleration of \( \mathbf{a} = \alpha\hat{i} - 4\hat{j} \) m/s², then the value of \( \alpha \) will be:
A particle of mass \( m \) moving with velocity \( v \) collides with a stationary particle of mass \( 2m \). After the collision, they stick together and continue to move with velocity:
A conducting loop of radius \( \frac{10}{\sqrt{\pi}} \) cm is placed perpendicular to a uniform magnetic field of 0.5T. The magnetic field is decreased to zero in 0.5 s at a steady rate. The induced emf in the circular loop at 0.25s is:
Why did the time period of rotation of Earth decrease by microseconds after the Japan 2011 earthquake?
In a reflecting telescope, a secondary mirror is used to:

A thermodynamic system is taken through a cyclic process as shown in the PV diagram. The total work done in the process is: 

The work done in placing a charge of \( 8 \times 10^{-18} \) coulomb on a capacitor of capacitance 100 microfarad is:

A disc is rolling without slipping on a surface. The radius of the disc is \( R \). At \( t = 0 \), the topmost point on the disc is \( A \) as shown in the figure. When the disc completes half of its rotation, the displacement of point \( A \) from its initial position is: 

If work done on a body is positive, then what will be the sign of kinetic energy?
A 100m long wire having cross-sectional area \( 6.25 \times 10^{-4} \, {m}^2 \) and Young's modulus is \( 10^{10} \, {Nm}^{-2} \) is subjected to a load of 250N, then the elongation in the wire will be:
Two planets \( A \) and \( B \) have radii \( R \) and \( 1.5R \), and densities \( \rho \) and \( \frac{\rho}{2} \) respectively. The ratio of acceleration due to gravity at the surface of \( B \) to \( A \) is:
Electric field in a certain region is given by \( \vec{E} = \left( \frac{A}{x^2} \hat{i} + \frac{B}{y^3} \hat{j} \right) \). The SI unit of A and B are:
The ratio of intensities at two points \( P \) and \( Q \) on the screen in a Young's double-slit experiment, where the phase difference between two waves of the same amplitude are \( \frac{\pi}{3} \) and \( \frac{\pi}{2} \), respectively, is:
The magnetic moment of an electron (e) revolving in an orbit around the nucleus with an orbital angular momentum is given by:
A bicycle tire is filled with air at a pressure of \( 270 \) kPa at \( 27^\circ C \). What is the approximate pressure of the air in the tire when the temperature increases to \( 36^\circ C \)?
Which of the following Maxwell's equations is valid for time varying conditions but not valid for static conditions:
A radioactive material is reduced to \( \frac{1}{8} \) of its original amount in 3 days. If \( 8 \times 10^{-3} \) kg of the material is left after 5 days, what was the initial amount of the material?
The effect of an increase in temperature on the number of electrons in the conduction band (\( n_e \)) and the resistance of a semiconductor will be as follows:
A particle executes Simple Harmonic Motion (SHM) with amplitude \( A \). The distance from the mean position when its kinetic energy becomes equal to its potential energy is:
The resistance of a wire is \( 5 \Omega \). What will be its new resistance in ohms if stretched to 5 times its original length?

The Bohr orbit radius for the hydrogen atom (\(n = 1\)) is approximately 0.530 \({Å}\). The radius for the first excited state (\(n = 2\)) 
orbit is (in \({Å}\)): 
 

In a Young's double slit experiment, the intensities at two points, for the path difference \( \frac{\lambda}{4} \) and \( \frac{\lambda}{3} \) (\( \lambda \) being the wavelength of light used) are \( I_1 \) and \( I_2 \) respectively. If \( I_0 \) denotes the intensity produced by each one of the individual slits, then \( \frac{I_1 + I_2}{I_0} \) is equal to:
Frenkel and Schottky defects are:

The energy levels of an atom are shown in the figure. Which one of these transitions will result in the emission of a photon of wavelength 124.1 nm? Given \( h = 6.62 \times 10^{-34} \) Js.