List of top Physics Questions

Two artificial satellites are revolving in the same circular orbit. Then they must have the same

Transformer is used to

Torr is the unit of physical quantity

Torricelli?? barometer used mercury but Pascal duplicated it using French wine of density $ 984 \,kg \,m^{-3} $ . In that case, the height of the wine column for normal atmospheric pressure is (Take the density of mercury $ = 13.6 \times 10^{3} \,kg\, m^{-3} $ )

To what height should a cylindrical vessel be filled with a homogeneous liquid to make the force with which the liquid pressure on the sides of the vessel equal to the force exerted by the liquid on the bottom of the vessel?

To what depth must a rubber ball be taken in deep sea so that its volume is decreased by $0.1 \%$. (Take, density of sea water =$10^{3} \, kg$ $m^{-3}$, bulk modulus of rubber =$9\times10^{8}N$ $m^{-2}$, $g=10 \,m$ $s^{-2})$

To shield an instrument from an external magnetic field it may be placed in a cabinet made of :

To shield an instrument from external magnetic field, it is placed inside a cabin made from

To increase the range of an ammeter, we need to connect a suitable :

To maintain a rotor at a uniform angular speed of $200\,rad\,s^{-1}$ an engine needs to transmit a torque of $180\,Nm$. The power of the engine required is (Assume the efficiency of the engine as 100%).

To get three images of a single object, one should have two plane mirrors at an angle of

To find the distance $d$ over which a signal can be seen clearly in foggy conditions, a railways engineer uses dimensional analysis and assumes that the distance depends on the mass density $\rho$ of the fog, intensity (power/area) $S$ of the light from the signal and its frequency $v$. The engineer finds that $d$ is proportional to $S^{1/n}$. The value of $n$ is

To correct myopia, the focal length of the concave lens should be:

Time period of SHM is given by T = 2$\pi$ [displacement / acceleration]$^{1/2}$. When displacement increases, the time period

Time period of oscillation of a spring is $12\, s$ on earth. What shall be the time period if it is taken to moon?

Threshold wavelength depends upon:

Three vessels $A$, $B$ and $C$ of different shapes contain a water upto the same height as shown in the figure. $P_{A}$, $P_{B}$ and $P_{c}$ be the pressures exerted by the water at the bottom of the vessels $A$, $B$ and $C$ respectively Then

Three waves of equal frequency having amplitudes 10mm, 4mm and 7mm arrive at a given point with successive phase difference $\pi/2$ . The amplitude of the resulting wave in mm is given by

Three uniform spheres of mass M and radius R earth are kept in such a way that each touches the other two. The magnitude of the gravitational force on any of the spheres due to the other two is

Three particles of masses 1 kg, 2 kg and 3 kg are situated at the corners of an equilateral triangle of side $b$. The coordinates of the centre of mass are

Three particles of masses $1\, kg, \frac{3}{2} kg$, and $2\,kg$ are located at the vertices of an equilateral triangle of side $a$. The $x, y$ coordinates of the centre of mass are

Three masses each of mass $m$ are placed at the vertices of an equilateral triangle $ABC$ of side $l$ as shown in figure. The force acting on a mass $2m$ placed at the centroid $O$ of the triangle is

Three identical bar magnets each of magnetic moment M are arranged in the form of an equilateral triangle such that at two vertices like poles are in contact. The resultant magnetic moment will be

Three containers of the same volume contain three different gases. The masses of the molecules are $m_1, m_2$ and $m_3$ and the number of molecules in their respective containers are $N_1, N_2$ and $N_3$. The gas pressure in the containers are $P_1, P_2$ and $P_3$ respectively. All the gases are now mixed and put in one of these containers. The pressure P of the mixture will be

Three equal masses of 1 kg each are placed at the vertices of an equilateral triangle PQR and a mass of 2 kg is placed at the centroid O of the triangle which is at a distance of $\sqrt2$ m from each of the vertices of the triangle. The force, in newton, acting on the mass of 2 kg is