List of top Physics Questions

The coefficient of performance of refrigerator, whose efficiency is $25\%$ is
The charge on an electron was calculated by
The characteristic's of light which are changed during modulation is/are
The centre of mass of a non uniform rod of length L whose mass per unit length $\lambda=\frac{Kx^2}{L},$ Where k is a constant and x is the distance from one end is :
The cause of the fractional atomic weight of elements is
The capacitors of capacitance $4\,\mu F$ and $6\,\mu F$ are connected in series. A potential difference of $500\, volt$ is applied to the outer plates of capacitor system. Then the charge on each capacitor is equal to
The capacity of a storage cell is expressed in :
The capacitance of a parallel plate capacitor is $5\,\mu F$. When a glass slab is placed between the plates of the capacitor, its potential difference reduces to $1/8$ of the original value. The thickness of the slab is equal to the separation between the plates. The value of the dielectric constant of glass is
The capacitance of a conductor in vacuum is $10\,F$. If it is put in a medium of relative permittivity $5$, the capacitance will be :
The breakdown in a reverse biased $p-n$ junction diode is more likely to occur due to
The breaking force for a wire of diameter D of a material is F. The breaking force for a wire of the same material of radius D is
The branch of optics dealing with the formation of images using the concept of straight line propagation of light is called:
The blades of a windmill sweep out a circle of area $A$. If the wind flows at a velocity $v$ perpendicular to the circle, then the mass of the air of density $\rho$ passing through it in time $t$ is
The average self-induced emf in a 25mH solenoid when the current in it falls from 0.2 A to 0 A in 0.01 second, is
The average depth of Indian ocean is about $3000\, m$. The fractional compression, $\frac{\Delta V}{V}$ of water at the bottom of the ocean is (Given : Bulk modulus of the water $= 2.2 ? 10^9 \,N \,m^{-2}$ and $g = 10 \,m\, s^{-2}$)
The area under acceleration-time graph represents the
The area of cross-section of a wire of length 1.1 m is 1 $mm^2$. It is leaded with 1 kg of Young's modulus of copper is $1.1\times10^i Nm^\circ$ , then the increase in length will be $(ifg = 10{ms^-2})$
The angular dispersion will be maximum in the following pairs of colours is
The angle of minimum deviation of a prism depend upon:
The angle of dip at a place on the earth's surface gives
The amplitude of a damped oscillator becomes one half after $t$ second. If the amplitude becomes $(1/n)$ after $3 \,t$ second, then $n$ is equal to
The adjacent graph shows the extension $(\Delta l)$ of a wire of length 1 m suspended from the top of a roof at one end with a load W connected to the other end. If the cross-sectional area of the wire is $10^{-6} m^2 , $ calculate the Young's modulus of the material of the wire.
The activity of a radioactive sample is measured as $N_{0}$ counts per minute at $t = 0$ and $N_{0}/e$ counts per minute at $t = 5$ minutes. The time (in minutes) at which the activity reduces to half its value is
The acronym LASER stands for
The accuracy in the measurement of the diameter of hydrogen atom as $1.06 \times 10^{-10}$ m is