List of top Physics Questions

A body executes simple harmonic motion. The potential energy (PE), the kinetic energy (KE) and total energy (TE) are measured as function of displacement x. Which of the following statements is true?
A mass M is suspended from a spring of negligible mass. The spring is pulled a little and then released so that the mass executes SHM of time period T. If the mass is increased by m, the time period becomes $ \text{5T/3,} $ then the ratio of $ \frac{m}{M} $ is
In an SHM, kinetic and potential energies become equal when the displacement is 1/$\sqrt{2}$ times the amplitude. In SHM, kinetic energy is zero when potential energy is maximum.
Three point charges $ +q,-2q $ and $ +q $ are placed at points $ (x=0,y=a,x=0), $ $ (x=0,y=0,z=0) $ and $ (x=a,y=0,z=0), $ respectively. The magnitude and direction of the electric dipole moment vector of this charge assembly are
Three charges $ 1\mu C, $ $ 1\mu C $ and $ 2\mu C $ are kept at vertices of $A, B$ and $C$ of an equilateral triangle $ABC$ of $ 10\,cm $ side respectively. The resultant force on the charge at $C$ is
A charge $q$ is uniformly distributed on a ring of radius $r$. A sphere of an equal radius is constructed with its centre lying on the periphery of the ring. The flux of electric field through the surface of the sphere will be
If charge and distance between two charges are reduced to half. Force between them
If the electric flux entering and leaving an enclosed surface respectively are $\phi_{1}$ and $\phi_{2}$, the electric charge inside the surface will be
An electric dipole of moment $p$ is Iying along a uniform electric field $E$. The work done in rotating the dipole by $90^{\circ}$ is
Electric field at the centre of a uniformly charged semicircle of radius a is
Two glass plates are separated by water. If surface tension of water is $75$ dyne/cm and area of each plate wetted by water is $8\, cm ^{2}$ and the distance between the plates is $0.12 \,mm$, then the force applied to separate the two plates is
The excess pressure inside a soap bubble is three times than excess pressure inside a second soap bubble, then the ratio of their surface area is
64 small drops of water having same charge and same radius are combined to form one big drop. The ratio of capacitance of big drop to small drop is
Work done in placing a charge of $ 8\times 10^{-18}C $ on a condenser of capacity $100 \, \mu \, F$ is
Two spherical conductors B and C having equal radii and carrying equal charges in them repel each other with a force F when kept apart at some distance. A third spherical conductor having same radius as that of B but uncharged, is brought in contact with B, then brought in contact with C and finally removed away from both. The new force of repulsion between B and C is
A dip needle arranged to move freely in the magnetic meridian dips by an angle $\theta$. If the vertical plane in which the needle moves is rotated through an angle $\alpha$ to the magnetic meridian, then the needle will dip by an angle
If the total magnetic field due to earth is $28 \,Am$, then the total magnetic induction due to earth is
The effect due to uniform magnetic fie Id on a freely suspended magnetic needle is as follows
A ball is thrown from a point with a speed $ {{\text{v}}_{\text{0}}} $ at an angle of projection $ \theta . $ From the same point and at the same instant, a person starts running with a constant speed $ \frac{{{v}_{0}}}{2} $ to catch the ball. Will the person be able to catch the ball? If yes, what should be the angle of projection?
In $R-C$ circuit $\omega=100\, rad \,s ^{-1},\, R =100\, \Omega,\, C =20\, \mu\, F$. What is impedance?
The magnetic moment of atomic neon is
Two balls of same mass each m are moving with same velocities v on a smooth surface as shown in figure. If all collisions between the masses and with the wall are perfectly elastic, the possible number of collisions between the bodies and wall together is
Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional forces are 10% of energy. How much power is generated by the turbine ? (g = 10 m/s$^2$)
A thin wire of mass $ M $ and length $ L $ is bent to form a circular ring. The moment of inertia of this ring about its axis is
Two closed organ pipes of length $100 \,cm$ and $101\, cm$ produces $16$ beats in $20\, sec .$ When each pipe is sounded in its fundamental mode calculate the velocity of sound.