List of top Physics Questions

Consider a spring-mass simple harmonic oscillator in one dimension. The mass of the particle is \(m\) kg and the spring constant is \(k\) N m\(^{-1}\). At a given instant, the extension of the spring is \(x\) metre and the speed of the particle is \(v\) m s\(^{-1}\). On the \(x-v\) plane, if the graph of \(v\) as a function of \(x\) is a circle, then
Consider that \(\sigma_s\), \(k_B\), and \(b\) represent Stefan-Boltzmann constant, Boltzmann constant, and Wien's displacement law constant, respectively. The dimension of \(\sigma_s k_B^{-1} b\) is:
The resistance of a metal wire at \( 20^\circ \text{C} \) is \( 1.05 \, \Omega \) and at \( 100^\circ \text{C} \) is \( 1.38 \, \Omega \). Determine the temperature coefficient of resistivity of this metal.
एक मोल एकपरमाणुक आदर्श गैस एक चक्रीय प्रक्रम से गुजरती है जैसा कि चित्र में दिखाया गया है। गैस को दी गयी (supplied) कुल ऊष्मा है :
A car covers the first half of the distance between two places at 40 km/h and another half at 50 km/h. The average speed of the car is
Consider a function \(f(x)\) which has exactly two roots at \(x=a\). If \[ \lim_{x\rightarrow a}\left(\frac{\lambda f^{\prime}(x)}{f(x)}-\frac{1}{x-a}\right)=m \ (\ne0), \] then the value of \(\lambda\) is:
When a PN junction diode is forward biased, the CORRECT statement is
Which of the following can be used in the output circuit of a diode rectifier to filter ac ripples?
The mass of a proton is $1.0073\text{u}$ and that of a neutron is $1.0087\text{u}$. The binding energy of $_2^4\text{He}$ is approximately (Given: helium nucleus mass = $4.0015\text{u}$)}
The ratio of the longest wavelength of the Lyman series to that of Ballmer series of the hydrogen spectrum is
The work function of a material is $6.6 \text{ eV}$. Then, the threshold wavelength of the metal is approximately (Take $h = 6.6 \times 10^{-34} \text{J.s}$)}
An electron and a proton possess same kinetic energy. If the de Broglie wavelengths of the electron and the proton are $\lambda_e$ and $\lambda_p$ respectively, identify the CORRECT relation.
The primary purpose of using polaroids in sunglasses is to
The width of a fringe is $0.5 \text{ mm}$ in Young’s double slit experiment for a light of wavelength $500\text{ nm}$. If the wave length of light alone is changed to $600 \text{ nm}$, the width of the fringe becomes}
A biconvex lens with equal radii of curvature $R$ has a focal length $f$. If the refractive index of the lens is $\frac{3}{2}$, the focal length of the lens is
The CORRECT statement among the following regarding electromagnetic waves is
The transformer core is laminated in order to
A current of $2 \text{ A}$ produces a magnetic flux of $10^{-3}$ weber per turn in a coil of $1000$ turns. Then, the self-inductance of the coil is
The INCORRECT statement is
The current through a galvanometer of resistance $50 \Omega$ is only $4\%$ of the main current when a shunt resistance is connected. The value of the shunt resistance is approximately
A wire of length $6 \text{ m}$ is bent to form a circular loop of single turn. If the current through the loop is $2 \text{ A}$, the magnetic moment of the circular loop (in $\text{Am}^2$ ) is
A particle of charge 10 times that of an electron is revolving in a circular path of radius $0.5 \text{ m}$. If the frequency of rotation is 10 rotations per second, the magnetic field at the centre of the circular path is approximately ($\mu_0 = 4\pi \times 10^{-7} \text{ Hm}^{-1}$)}
Kirchhoff’s first and second laws are respectively based on the conservation of
A battery supplies $0.6 \text{ A}$ current when a $3 \Omega$ resistor is connected with it. When the resistor $3 \Omega$ is replaced by $6 \Omega$, the current is reduced to $0.4 \text{ A}$. Then, the internal resistance of the battery is
A uniform wire of area of cross section $1 \times 10^{-7} m^2$ carries a current of $1.6 \text{ A}$. If the number density of electrons is $5 \times 10^{28} m^{-3}$, the drift velocity of electrons (in $\text{mm s}^{-1}$) is