List of top Physics Questions

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
Two concentric circular coils A and B have radii 25 cm and 15 cm and carry currents 10A and 15A respectively. A has 24 turns, and B has 18 turns. The direction of currents are in opposite order. The magnetic induction at the common centre of the codlis
Two resistors of resistances $R_{1}=\left(300 \pm3\right)\,\Omega$ and $R_{2}=\left(500 \pm4\right)\,\Omega$ are connected in series. The equivalent resistance of the series combination is
With increase in temperature the conductivity of
Which of the following is secondary cell?
Which of the following is NOT the name of a secondary cell ?
Which of the following is correct for $V$-$I$ graph of a good conductor ?
Which of the following $I$- $V$ graph represents ohmic conductors ?
A galvanometer of $ 50\,\Omega $ resistance has $25$ divisions. A current of $ 4\times {{10}^{-4}} $ A gives a deflection of one division. To convert this galvanometer into a voltmeter having a range of $25\, V$, it should be connected with a resistance of