List of top Physics Questions

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 types of electric charges positive charges and negative charges. The property which differentiates the two types of charges is
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
The working principle in atom bomb is
The word physics itself is due to Greek word
The work done by a body against friction always results in
The width of the forbidden band is small in the case of
The wheels are made circular because
The weight of the body is maximum in
The waves used by artificial satellites for communication is
The wavelength of X-rays which gives a diffraction angle, 2 $\theta$, equal to $16.80^{\circ}$ for a first order diffraction for a crystal with interplanar distance 0.200 nm, is (given sin $8.4^{\circ}$ and 0.146)
The wavelength of sodium light in glass if it is 589.3 nm in air is (The refractive index of glass is 1.5).
The wave impedance of free space is
The volume of atom in comparison to the volume of nucleus is of the order of
The volume of a metal sphere increases by $0.24\%$ when its temperature is raised by $40^{\circ}C$. The coefficient of linear expansion of the metal is
The volume of an air bubble increases by x% as it rises from the bottom of a lake to its surface. If the height of the water barometer is H, the depth of the lake is
The voltage drop across a forward biased diode is 0.7 V. In the following circuit, the voltages across the $10\,\Omega$ resistance in series with the diode and $20\,\Omega$ resistance are
The voltage of an A.C. source varies with time according to the equation $V=50\, \sin\,100\pi\,t\,\cos\,100\pi\,t$ . Where 't' is the sec and 'V' is in volts. Then
The vernier scale of a travelling microscope has $50$ divisions which coincide with $49$ main scale divisions. If each main scale division is $0.5\, mm$, then the least count of the microscope is
The velocity-time graph of a body is shown in figure. The displacement covered by the body in 8 s is
The velocity-time graph of a body moving in a straight line shown in the figure. The displacement and distance travelled by the body in 6 s are respectively
The velocity of centre of mass of the system remains constant, if the total external force acting on the system is