List of top Physics Questions

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
A radioactive isotope has a half-life of $T \,yr$. How long will it take the activity to reduce to $1\%$ of its original value?
The resistance of a wire is 24$O$. lt is so stretched that the length becomes four times, then the new resistance of wire will be
The figure shows graphs of pressure versus density for an ideal gas at two temperatures $T_1$ and $ T_2$, then
When white light passes through a glass prism, one gets spectrum on the other side of the prism. In the emergent beam, the ray which is deviating least is
Which of the following statements are incorrect ? (i) Average velocity is path length divided by time interval. (ii) In general, speed is greater than the magnitude of the velocity. (iii) A particle moving in a given direction with a non-zero velocity can have zero speed. (iv) The magnitude of average velocity is the average speed.
The potential energy of $ 4 $ -particles each of mass $ 1\,kg $ placed at the four vertices of a square of side length $ 1\,m $ is