List of top Physics Questions

The moment of inertia of a circular loop of radius $R$, at a distance of $R/2$ around a rotating axis parallel to horizontal diameter of loop is
In air the value of the total electric flux emitted from unit positive charge is
$1$ mole of gas occupies a volume of $200 \,mL$ at $100 \,mm$ pressure. What is the volume occupied by two moles of gas at $400 \,mm$ pressure and at same temperature?
In designing, a beam for its use to support a load. The depression at centre is proportional to (where, $Y$ is Young?s modulus)
Ionisation energy of $Li$ (Lithium) atom in ground state is $5.4\, eV$. Binding energy of an electron in $Li^+$ ion in ground state is $75.6\, eV$. Energy required to remove all three electrons of Lithium (Li) atom is
Diffraction effects are more easily detected in the case of sound waves than light waves because
A star $ A $ is 100 times brighter than star $B$. Then $m_B - m_A$ the difference in their apparent magnitudes is
An object placed in front of a concave mirror at a distance of $x \,cm$ from the pole gives a $3$ times magnified real image. If it is moved to a distance of $(x+5)\, cm$, the magnification of the image becomes $2$. The focal length of the mirror is
Two point charges $ + 10^{-7} C $ and $ - 10^{-7} C $ are placed at $ A $ and $ B, 20 \,cm $ apart as shown in the figure. Calculate the electric field at $ C, \,20\, cm $ apart form both $ A $ and $ B $ .
The position-time graph of a particle of mass $ 4 \,kg $ is shown in the figure. Calculate the impulse (in $ MKS $ units) at time $ t = 0 $ and $ t = 6 \,seconds $ respectively
In the given circuit, the AC source has ? = 100 rad/s. Considering the inductor and capacitor to be ideal, the correct choice(s) is(are)
In a Bipolar Junction Transistor $ (BJT) $ , the current gain $ \beta $ is defined is
Calculate the neutron separation energy from the following data: $ m (^{40}_{20} Ca) = 39.962591\,u $ , $ m (^{41}_{20} Ca) = 40.962278\,u $ , $ m_n = 1.00865, \,1u = 931.5\,Me V/c^2 $
Calculate the acceleration due to gravity on the surface of a pulsar of mass $ M = 1.98 \times 10^{30}\, kg $ and radius $ R = 12 \,km $ rotating with time period $ T = 0.041 \,s. (G = 6.67 \times 10^{-11}MKS) $
Calculate the highest frequency of the emitted photon in the Paschen series of spectral lines of the hydrogen atom
An object is placed at a distance of $10\, cm$ from co-axial combination of two lenses $A$ and $B$ contact. The combination forms a real image three times the size of the object. If lens $B$ concave with a focal length of $30\,cm$. The nature and focal length of lens $A$ is
An infinitely long hollow conducting cylinder with inner radius $R/2$ and outer radius $R$ carries a uniform current density along its length. The magnitude of the magnetic field, as a function of the radial distance $r$ from the axis is best represented by
Alpha particles of kinetic energy $ 7.7 \,MeV $ are being scattered by the nucleus of gold which has $ 79 $ electrons. The distance of closest approach of the alpha particles is (Take $ \frac{1}{4\,\pi\, \varepsilon_{0} = 9 \times 10^{9} \, MKS} )$
A thin uniform rod, pivoted at O, is rotating in the horizontal plane with constant angular speed $\omega$, as shown in the figure. At time t = 0, a small insect starts from O and moves with constant speed v with respect to the rod towards the other end. It reaches the end of the rod at t = T and stops. The angular speed of the system remains $\omega$ throughout. The magnitude of the torque $|\tau|$ on the system about O, as a function of time is best represented by which plot?
A planar coil having $12$ turns carries $15\, A$ current. The coil is oriented with respect to the uniform magnetic field $\vec{B}=0.2\, \hat{i} T$ such that its directed area is $\vec{A}=-0.04\, \hat{i} m ^{2}$ . The potential energy of the coil in the given orientation is
A particle moves in a circular orbit of radius $r$ under a central attractive force $ F=-\frac{k}{r},k $ is constant. The time period of its motion shall be proportional to
A new unit of length is chosen such that the speed of light in vacuum is unity. What is the distance between the sun and the earth in terms of the new unit if light takes 8 min and 20 s to cover this distance?
A mixture of 2 moles of helium gas (atomic mass = 4 amu) and 1 mole of argon gas (atomic mass = 40 amu) is kept at 300 K in a container. The ratio of the rms speeds $\bigg(\frac{ v_{rms}(helium)}{v_{rms(argon)}}\bigg)$ is
Which of the following is a semiconductor?
A conducting rod of length $L$ is moving in a uniform magnetic field $(B) $ with a velocity $v$ without rotation. The velocity of the rod is perpendicular to the rod, and the motion of the rod is confined to a plane perpendicular to the magnetic field. What is the induced emf developed across the rod?