List of top Physics Questions

Four balls each of radius $ 10\, cm $ and mass $ 1\, kg, 2\, kg, 3\, kg $ and $ 4 \,kg $ are attached to the periphery of massless plate of radius $ 1\,m $ .
What is moment of inertia of the system about the centre of plate ?
Angular width of central maxima in the Fraunhofer's diffraction pattern is measured. Slit is illuminated by the light of wavelength 6000 $\mathring {A}$. If slit is illuminated by light of another wavelength, angular width decreases by 30%. Wavelength of light used is
As temperature of a black body is raised, wavelength corresponding to maximum energy reduces. Higher temperature would mean higher energy and hence higher wavelength.
A capacitor of suitable capacitance can be used in an circuit in place of the choke coil. A capacitor blocks DC and allows AC only.
In an AC circuit, V and i are given by V = 100 sin (100t) volt and i = 100 sin $ \bigg( 100 t + \frac{ \pi}{ 3} \bigg) $ amp .The power dissipated in the circuit is
The angle of dip at a place on the earth gives
Torques $\tau_1 $ and $\tau_2$ are required for magnetic needle to remain perpendicular to the magnetic fields $B_1 $ and $B_2$ at two different places. The ratio $B_1 / B_2$ is
Two instruments having stretched strings are being played in unison. When the tension of one of the instruments is increased by $1\%, 3$ beats are produced in $2\,s$ . The initial frequency of vibration of each wire is:
Two conducting spheres of radii $R_{1}$ and $R_{2}$ are charged with charges $Q_{1}$ and $Q_{2}$ respectively. On bringing them in contact, there is
The minimum energy to ionize an atom is the energy required to
The moment of inertia of a uniform thin rod of length $L$ and mass $M$ about an axis passing through a point at a distance of $ \frac{L}{3} $ from one of its ends and perpendicular to the rod is
An electric immersion heater of $1.08 \,kW$ is immersed in water. After the water has reached a temperature of $ 100^{\circ }\,C, $ how much time will be required to produce $100\, g $ of steam?
A wire carrying current $i$ and other carrying $2i$ in the same direction produce a magnetic field $B $ at the midpoint. What will be the field when $2i$ current is switched off?
A closed vessel contains $8\, g$ of oxygen and $7\,g$ of nitrogen. The total pressure is $10$ atm at a given temperature. If now oxygen is absorbed by introducing a suitable absorbent the pressure of the remaining gas (in atm) will be
A charged particle enters in a magnetic field $H$ with its initial velocity making an angle of $45^{\circ}$ with $H$. The path of the particle will be
The temperature (T) dependence of resistivity (p) of a semiconductor is represented by
When a lens of refractive index $ n_{1} $ is placed in a liquid of refractive index $ n_{2}$ the lens looks to be disappeared only if
The effective resistance between points A and C for the network shown in figure is
The density of a nucleus of mass number $A$ is proportional to
Sphygmomanometer is an instrument used to record
When a lens of refractive index $ n_{1} $ is placed in a liquid of refractive index $ n_{2}$ the lens looks to be disappeared only if
The density of a nucleus of mass number $A$ is proportional to
$ C_v $ for $O_2 $ is $\frac{ 5}{2} $ R with increase in temperature it becomes $ \frac{ 7}{2} $ R due to a
Average velocity of an ideal gas molecule is
Application of a forward bias to a p-n junction