List of top Physics Questions

In the given circuit, find voltage across 12 Ω resistance.
Electric circuit
The density of a material in SI units is $128 \; kg \; m^{-3}$. In certain units in which the unit of length is $25\, cm$ and the unit of mass is $50\, g$, the numerical value of density of the material is :
Which of the following is a Hermitian operator?
A naughty boy hit a mango tree by stone then a mongo fall down. Why the mango fall down :
Universal Law of gravitation is :
1 KWh is equal to :
Sound can move in:
What is the relation between sound velocity ($ V $), frequency ($ \gamma $), and wavelength ($ \lambda $)?
The number of electrons constituting one coulomb of charge :

V-I graph for four materials A, B, C \& D are shown in fig. The best material to make live wire of domestic wiring is :

The resistivity of a conductor depends upon :
If the diameter of a wire of $ 1 \, \Omega $ is tripled, then its resistance will become:
Conductivity of metal's is due to :
On increasing the temperature, the resistance of conductors:

The current in $7.2 \, \Omega$ resistor is :

The reading of the voltmeter is :

Which of the following does not represent electric power in the circuit ?
Two identical resistance wires are first connected in series and then in parallel in an electric circuit. The ratio of heat produced in the two cases will be :
SI unit of density is :
A load of mass $M\, kg$ is suspended from a steel wire of length $2\, m$ and radius $1.0\, mm$ in Searle's apparatus experiment. The increase in length produced in the wire is $4.0\, mm$. Now the load is fully immersed in a liquid of relative density $2$. The relative density of the material of load is $8$. The new value of increase in length of the steel wire is :
Assuming that the gravitational potential energy of an object at infinity is zero, the change in potential energy (final - initial) of an object of mass m, when taken to a height h from the surface of earth (of radius R), is given by,
A string of length $1\, m$ and mass $5\, g$ is fixed at both ends. The tension in the string is $8.0\, N$. The siring is set into vibration using an external vibrator of frequency $100\, Hz$. The separation between successive nodes on the string is close to :
A travelling harmonic wave is represented by the equation $y (x, t) = 10^{-3} sin (50 t + 2x)$, where $x$ and $y$ are in meter and $t$ is in seconds. Which of the following is a correct statement about the wave? The wave is propagating along the
A cylindrical plastic bottle of negligible mass is filled with $310\, ml$ of water and left floating in a pond with still water. If pressed downward slightly and released, it starts performing simple harmonic motion at angular frequency $\omega$. If the radius of the bottle is $2.5\, cm$ then $\omega$ close to : (density of water = $10^3 \; kg / m^3$)
In a process, temperature and volume of one mole of an ideal monoatomic gas are varied according to the relation $VT = K$, where $K$ is a constant. In this process the temperature of the gas is incresed by $\Delta T$. The amount of heat absorbed by gas is (R is gas constant) :