Which of the following characteristics of electron determines the current in a conductor?

Two lenses of focal lengths, 20 cm and - 25 cm, respectively are placed in contact with each other. The power of the combination of lenses is

A uniform electric field exists in the positive x-direction. Let \( V_A = \) electric potential at (0, 0, 0) cm, \( V_B = \) electric potential at (5, 0, 0) cm and \( V_C = \) electric potential at (0, 5, 0) cm. The correct relationship between them is :

A cylindrical bar magnet is kept along the axis of circular coil. If the magnet is rotated about its axis, then :

Arrange the following in the order of increasing resistivity (\( \rho \))
(A) Copper
(B) Silver
(C) Glass
(D) Carbon (graphite)
(E) Germanium
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Magnetic susceptibility \(X\) of a given material is \(- 0 . 5\). Identify the magnetic material.

A coil \(C_1\) is connected to a galvanometer G. Second coil \(C_2\) is connected to a battery through a tapping key. The steady current in the coil \(C_2\) produces a steady magnetic field. As coil \(C_2\) is moved towards the coil \(C_1\), the galvanometer shows a deflection. To obtain a large deflection, one or more of the following steps can be taken:
(A) Use a rod made of soft iron inside the coil \(C_2\)
(B) Connect the coil \(C_2\) to a more powerful battery
(C) Move the arrangement of coil \(C_2\) rapidly towards the coil \(C_1\)
(D) hold the key pressed continuously
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Which of the following statements is not correct?

The integrated rate equation for a first order reaction is \(\frac{kt}{2.303} = \log R_0 - \log R_t\). The straight line graph is obtained by plotting :

Match List-I with List-II

List-I (Terms)	List-II (Examples)
(A) Somatic hybrid	(I) Bt toxin
(B) Tissue culture	(II) Apical and axillary meristem
(C) Insecticidal protein	(III) Pomato
(D) Virus free plant	(IV) Explants

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A galvanic cell behaves as electrolytic cell when?

Photoelectric work function of a metal is 1 eV. Light of wavelength \( \lambda = 3000\text{\AA} \) falls on it. The photoelectrons come out with maximum kinetic energy of:

The current-voltage graphs for a given metallic wire at two different temperatures, \( T_1 \) and \( T_2 \) are shown in the figure. The correct relation of temperatures and resistances will be :