List of practice Questions

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 ?

The resistance of an ideal voltmeter is

The resistivity of a material is inversely proportional to

The resistivity of alloy manganin is

The resistivity of semiconductors depends on :

The resistor $R_1$ dissipates power $P$ when connected to a generator. If a resistor $R_2$ is inserted in series with $R_1$ the power dissipated by $R_1$

The temperature coefficient of resistance ot a wire is $0.00125 \, per \, ^\circ C$. At 300 K temperature its resistance is $1?$. The resistance of the wire will be $2?$ at

The thermometric liquid used to measure upto $-100^{\circ} C$ is

The total positive charge in a glass of water containing 180 gm of water is approximately :

The voltage $V$ and current. $I$ graphs for a conductor at two different temperatures $T_1$ and $T_2$ are shown in the figure.

The relation between $T_1$ and $T_2$ is

To obtain maximum resistance by joining the given resistors, they should be grouped in

Two batteries of emf $\varepsilon_{1}$ and $\varepsilon_{2}\left(\varepsilon_{2}>\varepsilon_{1}\right)$i) and internal resistances $r_1$ and $r_2$ respectively are connected in parallel as shown in figure