NEET 2010 PYQ Mock Test

A square surface of side $L\text{ meter}$ in the plane of the paper is placed in a uniform electric field $E\text{ (volt/m)}$ acting along the same plane at an angle $\theta$ with the horizontal side of the square as shown in figure. The electric flux linked to the surface, in units of volt-m, is:

A series combination of $n_1$ capacitors, each of value $C_1$, is charged by a source of potential difference $4V$. When another parallel combination of $n_2$ capacitors, each of value $C_2$, is charged by a source of potential difference $V$, it has the same (total) energy stored in it, as the first combination has. The value of $C_2$, in terms of $C_1$, is then:

A potentiometer circuit is set up as shown. The potential gradient, across the potentiometer wire, is $k\text{ volt/cm}$ and the ammeter reads $1.0\text{ A}$ when two way key is switched off. The balance points, when the key between the terminals (i) 1 and 2 (ii) 1 and 3, is plugged in, are found to be at lengths $l_1\text{ cm}$ and $l_2\text{ cm}$ respectively. The magnitudes, of the resistors $R$ and $X$, in ohms, are:

A galvanometer has a coil of resistance $100\text{ ohm}$ and gives a full scale deflection for $30\text{ mA}$ current. If it is to work as a voltmeter of $30\text{ volt}$ range, the resistance required to be added will be:

Consider the following two statements:
(A) Kirchhoff's junction law follows from the conservation of charge.
(B) Kirchhoff's loop law follows from the conservation of energy.
Which of the following is correct?