List of top Physics Questions

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 charges of equal magnitude $q$ is placed at the vertices of an equilateral triangle of side $l$. The force on a charge $Q$ placed at the centroid of the triangle is

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

Three charges each equal to $+2 \,C$ are placed at the corners of an equilateral triangle. If the force between any two charges be $F$, then the net force on either will be :

Three capacitors of capacitances $3\,\mu F$,$9\,\mu F$ and $18\,\mu F$ are connected once in series and another time in parallels. The ratio of equivalent capacitances in the two cases $(C_s/C_p)$ will be

Three charge q, Q and 4q are placed in a straight line of length l at points distant 0, $\frac{1}{2}$ and l respectively from one end. In order to make the net froce on q zero, the charge Q must be equal to

Though quantum theory of light can explain a number of phenomena observed with light, it is necessary to retain the wave-nature of light to explain the phenomena of:

There is some change in length when a 33000 N tensile force is applied on a steel rod of area of cross-section $10^{-3}m^2$. The change of temperature required to produce the same elongation of the steel rod when heated is $(Y=3\times 10^{-11} \,N/m^2 , \alpha = 1.1 \times 10^{-5} /^0C )$

There are two types of electric charges positive charges and negative charges. The property which differentiates the two types of charges is

There is a horizontal fdm of soap solutions, on it a thread is placed in form of a loop. The film is pierced inside the loop and the thread becomes a circular loop of radius R. If the surface thension of soap solution is T. Then tension in the thread will be

There are two holes one each along the opposite sides of a wide rectangular tank. The cross section of each hole is $0.01\,m^2$ and the vertical .distance between the holes is one meter. The tank is filled with water. The net force on the tank in New ton when water flows out of the holes is : (Density of water $1000kg/m^3)$

There are four forces acting at a point $P$ produced by strings as shown in figure, which is at rest. The forces $F_{1}$ and $F_{2}$ are

There are certain material developed in laboratories which have a negative refractive index. A ray incident from air (medium $1$) into such a medium (medium $2$) shall follow a path given by

There are $2$ bodies of masses $100\, kg$ and $1000\,kg$ separated by a distance $1\,m$. At what distance from smaller body, the intensity of gravitational field will be zero