List of top Physics Questions

Two parallel infinite line charges with linear charge densities $+\lambda \, C/m$ and $-\lambda \, C/m$ are placed at a distance of 2R in free space. What is the electric field mid-way between the two line charges ?
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 :
The resistance of an ideal Voltmeter is :

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 :
If a particle is fixed on a rotating frame of reference, the fictitious force acting on the particle will be:
Let the moment of inertia of a hollow cylinder of length $30\, cm$ (inner radius $10\, cm$ and outer radius $20\, cm$), about its axis be 1. The radius of a thin cylinder of the same mass such that its moment of inertia about its axis is also $I$, 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 :
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 :