List of top Physics Questions

An electric lamp is marked 100 W, 220 V. If it operates at 200 V, the current through it will be:
Insulators do not allow flow of current through them Insulators have no free charge carriers
Potentiometer is used only to compare potential differences The potentiometer draws current from the voltage source being measured
The resistance of a conductor decreases with increase in cross-sectional area On increasing the cross-sectional area of a conductor, more current will flow through the conductor
Calculate the steadystate current in the $2\,\Omega$ resistor shown in the circuit in the figure.
The internal resistance of the battery is negligible and the capacitance of the condenser $C$ is $0.2\, \mu F$.
For higher sensitivity essential for the potentiometer is
For ohmic conductor the drift velocity $\upsilon_d$ and the electric field $E$ applied across it are related as:
If potential difference across a conductor, having a material of specific resistance $\rho$ remains constant, then according to Joules law, heat developed in the conductor is directly proportional to :
If the radius of a wire carrying current is doubled, the drift velocity of the electrons will be
In a metre bridge experiment null point is obtained at $20\,cm$ from one end of the wire when resistance $X$ is balanced against another resistance $Y$. If $X < Y$, then where will be the new position of the null point from the same end, if one decides to balance a resistance of $4\, X$ against $Y$ ?
In a potentiometer of $10$ wires, the balance point is obtained on the $7^{th}$ wire. To shift the balance point to $9^{th}$ wire, we should
In a wheatstone bridge if the battery and galvanometer are interchanged then the deflection in galvanometer will
In an atom electrons revolves around the nucleus along a path of radius $0.72 \,?$ making $9.4 \times 10^{18}$ revolution per second. The equivalent current is $(e = 1.6 \times 10^{-19}\, C)$
In parallel combination of $n$ cells, we obtain
In the circuit given below the ammeter reading is zero.What is the value of the resistance R?
In the series combination of $n$ cells each cell having emf $\varepsilon$ and internal resistance $r$. If three cells are wrongly connected, then total emf and internal resistance of this combination will be
In the series combination of two or more than two resistances
Match column $I$ with column $II$ and select the correct option from the given codes.
$n$ resistors each of resistance $R$ first combine to give maximum effective resistance and then combine to give minimum effective resistance. The ratio of the maximum to minimum resistance is
Resistivity of conductor depends on
Silicon is an important constituent of
The radius of a metal sphere at room temperature $T$ is $R$, and the coefficient of linear expansion of the metal is $\alpha$. The sphere is heated a little by a temperature $ \Delta T$ so that its new temperature is $(T + \Delta T)$. The increase in the volume of the sphere is approximately
The range of voltmeter of resistance $300\, \Omega$ is $5 \,V$. The resistance to be connected to convert it into an ammeter of range $5\, A$ is
The reading of ammeter shown in figure is
The resistance in ohm in the four arms of wheatstone bridge are as follows. In which case the bridge is balanced ?