List of top Physics Questions

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
The velocity of light in air is $3 \times 10^8 \,m s^{-1}$ and that in water is $2.2 \times 10^8\, m s^{-1}$. The polarising angle of incidence is
The velocity-displacement graph of a particle is as shown in the figure. Which of the following graphs correctly represents the variation of acceleration with displacement ?
The variation of density of a solid with temperature is given by the formula
The velocity head of a stream of water is 40 cm. Then, the velocity of flow of water is
The value of universal gravitational constant $G=6.67 \times 10^{-11}\,N\,m^{2}\,kg^{-2}$. The value of $G$ in units of $g^{-1}\, cm^3\, s^{-2}$ is
The value of the magnetic field induction at the centre of the coil, if l = 2A, h= 10 cm. in the following figure is
The value of P so that the vectors $2 \hat i - \hat j + \hat k, \hat i + 2 \hat j - 3 \hat k$ and $3 \hat i + P \hat j + 5 \hat k$ are coplanar should be
The value of horizontal component of earths magnetic field at a place is $0.35\times10^{-4}$ tesla. If the angle of dip is $60^0$, the value of vertical component of earths magnetic field is about :
The value of g on earth's surface is $980\,cms^{-2}$. The value at a height of 64 km from surface of earth is
The value of angle of dip is zero at the magnetic equator because on it
The unit of thermal conductance is
The unit of the quantity g/G in SI will be
The unit of pole strength is :